General IHS Administration





The International Hydrofoil Society (IHS) Hydrofoil Correspondence Archives


Updated last August 22, 2006

General: IHS Administration

General: IHS Administration      Top

YEAR 2005

Re; Grumman pics for archive

“2”,”947368″,”1″,”Re; Grumman pics for archive||947368″,”Thanks, Scott, I made sure that John Meyer got a copy of your offer, and I suggested these be added to one of the IHS CD-ROMs of hydrofoil data. We have already published the owner manual and a technical report on this boat on IHS CD-ROM (number 2 I believe, without checking back to be sure).”,”2005-12-14″,”Barney C Black”,”nopswd”,” “,” “,”940161”

Re; Grumman pics for archive

“3”,”940161″,”1″,”Grumman pics for archive||940161″,”Just wanted to let you know, I got the 1968 grumman hydrofoil running and have some good pictures and a couple of 3 meg videos if you would like to put them in the archives. Drop me a line at”,”2005-11-30″,”Scott Smith”,”nopswd”,” “,””,”1″


“5”,”916704″,”1″,”IHS Autumn 05 NEWS LETTER ||916704″,”The Autumn issue of the IHS Newsletter is available for download at the IHS web site.


Issue Contents:
– High-Speed USSV . . . . . . . p. 4
– Expanding the Envelope . . p. 5
– CFD Eases Prop Design . . . p. 7
– T-Foil Design . . . . . . . . . . . . p. 9
– Sailor’s Page . . . . . . . . . . . p.10

Members should receive an email with the needed password.
Others can download past issues to see what you are missing.
Membership is only $20. and includes 4 issues of the newsletter.
“,”2005-10-19″,”william white”,”nopswd”,” “,””,”1″



Dear Sir/Madam
Ethiopia is a Country where we all originated and feel instantly when we are in Ethiopia, we all remember that our ancestors had lived in Ethiopia. This is a Country that you should not miss as a traveler


Cultural, Trekking & Volcanic Tours-Ethiopia

KIND ATTN. Dear Sirs,

Warm Greeting from ETHIOPIA!!!

We kindly ask you to read our introduction letter which is a means to explore about
LETS GO Ethiopia TOUR OPERATOUR and mutual business opportunities .We appreciates in replying to us.
We would like to introduce ourselves and invite you to make your Slogan “Distinctive
ETHIOPIAN Travel” real and enjoyable with LETS GO Ethiopia TOUR OPERATOURS..
We introduce LETS GO Ethiopia Tours and Travel, as one of Tour Operator based in Ethiopia, East Africa engaged in the tourism industry.
Since now we are aware of your address we were having thoughts whether your company may take some interest in sending clients and arranging tours to Ethiopia through our agency.
We have a qualified and dedicated team of Spanish, French, Germany, Arabic, Italian, and English speaking professionals who can take care of all the clients need. We specialize all kinds of tours such as, Volcano Tours, FIT/Groups, cultural tours, wildlife safaris, bird watching, horse/jeep safaris, conferences, charters, special interest tours, trekking, rafting, incentives etc. We have our own ticketing stock of all major airlines both Domestic & International. We can arrange latest model vehicles and can provide it anywhere as per your requirements. We can also arrange multi language-speaking guides in most of the major cities. We have some tailor-made itineraries, which are very famous in Ethiopia but can also
specially design the itineraries as per the requirement of the customers. Should you need some more details, please feel free to contact us.
Our friendly staffs will handle your requests promptly, on time without delay and we are on the move 24hours a day. Please fell free to request the rates for Individuals, or group tours.
We are very sure that the rates will be very competitive and are the best one can offer from Ethiopia on this market. Why not request the rates and experience? We very much
appreciate your effort and time on reading this mail and hope we could start and develop a long-term business relationship, of course for mutual benefit.

Please kindly let us know the receiving of this message by return e-mail.
Sincerely yours,
Abera Wasihun
Managing Director
Incase of any further query, please feel free to contact us on e-mail:

Our Full address is:

Address ;Churchill road
E-mail :
Telephone 00 251911249079
Fax: 0025111157374
Cell : 00251911249079 contact Abera 24 Hours
P.O.BOX 21223code1000
Addis Ababa , Ethiopia

“,”2005-09-27″,”LETS GO ETHIOPIA TOUR S”,”nopswd”,” “,””,”1″

Re; Re; Re; Volga 70 for Sale

“7”,”884749″,”1″,”Re; Re; Re; Volga 70 for Sale||884749″,”Hello Allesandro,
The full set of pictures are on the web at, search boats in Vermont (VT) under 30 feet. I’ve included a few here but the files are large and would email slowely. If you send me a land mail address I can burn a CD and send it to you. “,”2005-08-28″,”Mike Turner”,”nopswd”,” “,””,”883583″

Re; Re; Volga 70 for Sale

“8”,”883583″,”1″,”Re; Re; Volga 70 for Sale||883583″,”MR MIKE TURNER,
COSTA RICA Text “,”2005-08-26″,”ALESSANDRO PITTANA”,”nopswd”,” “,””,”882988″

Re; Volga 70 for Sale

“9”,”882988″,”1″,”Re; Volga 70 for Sale||882988″,”Hi Barney,

I have a Volga 70 Hydrofoil on trailer for sale in VT. It has been converted to a very beautiful and fast runabout. Would you know of anyone interested in buying it? I have too many boats and my wife is not keen on it. I am open to all offers and can arrange delivery most anywhere in the world. Pix can be viewed at under Vermont boats 30 feet or less. I’ll pay a commission for any leads that end in a sale.
Please speread the word. Thanks , Mike Turner”,”2005-08-25″,”Mike Turner”,”nopswd”,” “,””,”882758″

Vietnam Photos

“10”,”882758″,”1″,”Vietnam Photos||882758″,”Very nice foto. Please provide also some details about the ferry service… routes and costs, for example! Thanks. – B”,”2005-08-24″,”Barney C Black”,”poopdeck”,” “,” “,”879536”

Uploading photos

“11”,”879536″,”1″,”Re; Uploading photos||879536″,”Here’s a try to attach on this board”,”2005-08-18″,”Ho Sing”,”nopswd”,” “,””,”876863″

Uploading photos

“12”,”876863″,”1″,”Uploading photos||876863″,”I am a registered member, I was trying to share some photos of Kometas I took on the Saigon river. But the emails to the gallery, webmaster, even the BBS were rejected. Any other way to get through?

-Ho Sing”,”2005-08-14″,”Ho Sing”,”nopswd”,” “,””,”1″

JOINT MEETING IHS and SD-5 on 9 June

“13”,”852360″,”1″,”JOINT MEETING IHS and SD-5 on 9 June||852360″,” Please visit us at
and contact me directly at

We would love to learn more about your orgranization, how to join and events.
Our cats are state of the art 65 & 85 ft USCG approved ( 149 passenger r/o capability cruise comfortable at 41 knots) and we are interested to pursue ferry business worldwide.

Brett Sherman”,”2005-06-28″,”Brett Sherman”,”nopswd”,” “,””,”0″

JOINT MEETING IHS and SD-5 on 9 June


Thursday, 9 June 2005

Radisson Hotel (formerly Days Inn)
2020 Jefferson Davis Highway, Arlington, VA 22202

5:30 to 6:30 PM Cash Bar – 6:30 to 7:30 PM Dinner – 7:30 to 8:30 PM Program

Menu: Rolls & Butter, Caesar Salad, London Broil, Vegetable, Potato
Dessert, Iced Tea, Coffee/Tea

$30.00 per person. Please make checks payable to IHS

Make reservations by noon, 6 June

Contact: Ken Spaulding:

Please honor reservations. No-shows may be requested to cover costs incurred.


Brian Forstell
Director, Research and Development, CDI Marine SDD
kbs3131″,”2005-05-22″,”white”,”nopswd”,” “,””,”0″

“15”,”785216″,”1″,”JOINT MEETING IHS and SD-5 on 10 Mar 2005||785216″,”

Thursday, 10 March 2005

Radisson Hotel (formerly Days Inn)

2020 Jefferson Davis Highway, Arlington, VA 22202

5:30 to 6:30 PM Cash Bar – 6:30 to 7:30 PM Dinner – 7:30 to 8:30 PM Program

Menu: Rolls & Butter, Caesar Salad, London Broil, Vegetable, Potato, Dessert, Iced Tea, Coffee/Tea

$30.00 per person. Please make checks payable to IHS

Make reservations by noon, 6 March

Contact: Ken Spaulding:

Please honor reservations. No-shows will be held responsible for costs incurred.


Speaker: Stanley Wheatley
Manager and Principal Investigator, CCDoTT

The Center for the Commercial Deployment of Transportation Technologies (CCDoTT) is a chartered maritime research group operating within the California State University, Long Beach Foundation organization. It has been actively engaged in both university and commercial organization contract programs seeking to develop enabling technologies associated with High-Speed Ships, Agile Ports, Rapid Deployment, Seabasing and more recently Port Security. The organization is contracted to the Office of Naval Research and has been supported by DOD appropriations. This presentation by Stan Wheatley will provide an overview of a number of past and ongoing CCDoTT programs of interest to the advanced marine vehicle community.

Mr. Wheatley is currently the Manager and Principal Investigator of the CCDoTT programs, a position he has held since 1999. A graduate of the U.S. Merchant Marine Academy, he has served at sea on various commercial and naval ships in all engineering capacities completing his active seagoing career as Chief Engineer of the N.S. SAVANNAH. Following assignments with the U.S. Maritime Administration as Director, Office of Advanced Ship Operations; Director, The National Maritime Research Center; and Director of Ships Operations; Mr. Wheatley was engaged as Vice President of Engineering with a U.S. flag shipping company operating both commercial and government owned ships in worldwide trade.”,”2005-02-21″,”Bill White”,”nopswd”,” “,””,”0″

Re: dynafoil

“16”,”768755″,”1″,”Re: dynafoil||768755″,”If you will go to the IHS main page at, then scroll down to the search engine, then search for the word dynafoil, you will locate several pages where Dynafoil info is located. You will also find the names and email addresses for people interested in and knowledgeable about Dynafoils… don’t hesitate to contact them with specific questions.”,”2005-01-22″,”Barney C Black”,”poopdeck”,” “,””,”0″


“17”,”768179″,”1″,”dynafoil||768179″,”if u have any info or website on dynafoil, please contact me at . or if u have any manuals or background history, or maybe pictures of it up close, showing the parts. thanx”,”2005-01-21″,”kim”,”nopswd”,” “,””,”0″

cool site

“18”,”760997″,”1″,”cool site||760997″,””,”2005-01-08″,”scott”,”nopswd”,” “,””,”0″

Washington Area Meeting Announcement

“21”,”733625″,”1″,”Washington Area Meeting Announcement||733625″,”Attached is an announcement for the next Joint IHS/SD-5 Dinner Meeting to be held on Thursday, Dec 2, 2004.

Location: DAYS INN, 2020 Jefferson Davis Highway, Arlington, VA 22202

5:30 to 6:30 PM Cash Bar – 6:30 to 7:30 PM Dinner – 7:30 to 8:30 PM Program

$30.00 Per Person. Please make checks payable to IHS

Menu: Rolls & Butter, Caesar Salad, Chicken Marsala, Vegetable, Potato, Iced Tea, Coffee/Tea

Space is limited, so make reservations early; no later than 29 November (noon) if you plan to attend. [Please honor reservations. Sponsoring Societies are responsible for no-shows.]

Contact: Ken Spaulding: for reservations.”,”2004-11-05″,”Barney C Black”,”poopdeck”,” “,””,”0″

LCS Littoral Combat Ship IHS Presentation

“23”,”730459″,”1″,”LCS Littoral Combat Ship IHS Presentation||730459″,”At the 23 Sept 2004 Joint Meeting of the INTERNATIONAL HYDROFOIL SOCIETY (IHS) &
SNAME Panel SD-5, Pete Czapiewski the Ship Design Manager from NAVSEA 05D2/PMS 501SDM gave a very timely presentation on the status of the Littoral Combat Ship (LCS) program.

Pete brought the attending IHS members and guests up to speed on all aspects of the Navy’s LCS Flight 0 program and it’s two concepts of a Highspeed Monohull and Trimaran by the LOCKHEED MARTIN (Gibbs & Cox • Marinette Marine • Bollinger Shipyards) and GENERAL DYNAMICS (Bath Iron Works • Austal • BAE Systems • CAE • MAPC) design teams.

A copy of the vugraphs from the presentation is located on the main IHS Web Home page at:

It is listed under the Hydrofoil Articles, Papers, Books & Other References Site

It is a 3.4mb Adpbe pdf file so be patient.”,”2004-10-29″,”Bill White”,”foilsadm”,” “,””,”0″

Re: Spam

“24”,”699165″,”1″,”Re: Spam||699165″,”John

I have set up a Restricted BOD site on the BBS. Lets test it to see if it helps with spam and maybe just makes BOD messaging easier. It still lets us use the email address So once you set up the password on the BBS and set it to forward messages to your email you can see messages either at your email or on the BBS. It also has a voting capability. and will handle any attachments. It also collects all messages on any topic in one place for ease of review. It also has an archive capability to permanently collect old actions.

The first area of the BBS entitled “General Administration” has been resrticted to BOD use. It can not be accessed without a BOD password.

The password for the Board of Directors section is “theboard”

Use the following url on your web browser to go to the password entering page.

Enter the password and check the box that saves it for future use.

This should give you permanent access to this restricted area to conduct all BOD business

Bill White”,”2004-08-24″,”Bill White”,”guru”,” “,””,”0″

Re: Spam

“25”,”699164″,”1″,”Re: Spam||699164″,”John,

I get my share of spam, but very little addressed to .

“,”2004-08-24″,”Bill White”,”guru”,” “,””,”0″

Re: Spam

“26”,”699163″,”1″,”Re: Spam||699163″,”George,

You are lucky not to get so much SPAM.

“,”2004-08-24″,”Bill White”,”guru”,” “,””,”0″

Re: Spam

“27”,”699162″,”1″,”Re: Spam||699162″,”John,

What exactly are you planning to try? If it’s checking out the provider’s spam filter, OK.

If it’s doing away with the entirely, there are a lot of references on the website and elsewhere that have to be changed in parallel. This includes all our “profiles” on PayPal.

Something to keep in mind.

FYI, I get virtually no spam addressed to “”

“,”2004-08-24″,”Bill White”,”guru”,” “,””,”0″

Re: Spam

“28”,”699161″,”1″,”Re: Spam||699161″,”Barney and Bill W.

In spite of what Sumi says, Its worth a try re the xxx@foils,org

Who will do that?

John”,”2004-08-24″,”Bill White”,”guru”,” “,””,”0″

Re: Spam

“29”,”699159″,”1″,”Re: Spam||699159″,”Good idea
ken”,”2004-08-24″,”Bill White”,”guru”,” “,””,”0″

Re: Spam

“30”,”699158″,”1″,”Re: Spam||699158″,”I don’t know if it makes much difference how the address is posted. I get
about 12 to 15 spams on the average a day which I believe is generated
from the BBS and IHS web pages having my e-mail address in view. The
e-mail address I have that is not posted at these locations, but is used
only by my close friends and relatives have not received any spams to
Sumi”,”2004-08-24″,”Bill White”,”guru”,” “,””,”0″

Re: Spam

“31”,”699157″,”1″,”Spam||699157″,”Now that we have the BBS, it is worth considering deleting the for the directors, editor, etc. A note could be added to
theboard.htm to post message in a particular folder of the BBS, attn to
whomever you wanted to contact. Of course the message would be public, but
in case it were a private matter, the posted message could just say please
contact me.
protected from spam harvesters because they are rolled up in a java applet.
Finally, it is possible that the email provider offers a built-in
spam filter,

Original Message:
From: John R. Meyer
Date: Sun, 22 Aug 2004 14:35:42 -0400
Subject: Re: SPAM


Join the group. I get it re president AND editor. Also get what is
supposed to go to Mark Bebar.

I had talked to Barney about this sometime ago and he felt it was important
for the world to be able to contact the officers of the IHS easily. I
agreed at the time. I must admit that it is less on comcast than it was
when I had erols.

At 11:31 AM 8/22/2004 -0400, Ken Spaulding wrote:
Interesting. Some months ago I changed my e-mail address to reduce
spam. It worked for about two weeks only. Now, I’ve just noticed that
90% of my daily spam (say 30-35) is addressed to IHS Secretary and/or
comes from Mark Bebar???

Voting on the BBS

“32”,”698711″,”1″,”Voting on the BBS||698711″,” We can vote on any subject here in the protected BOD area.

Vote yes to use
vote no to refuse”,”2004-08-24″,”Bill White”,”guru”,” “,””,”0″


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The International Hydrofoil Society (IHS) Hydrofoil Correspondance Archives


Updated last August 22, 2006

General: IHS Administration

General: IHS Administration      Top

YEAR 2002-2004

Membership Renewal Time

      • It’s time to renew your IHS membership for 2003!
      • We have made it easy and very inexpensive to join, or renew your membership, via a secure link to Pay Pal at our IHS home site as linked below for you to click on., [Msgid=364642] *
Site Outage

      • The IHS website dropped off the internet for several hours on Thursday 14 August 03 and into 15 August 03 as a result of a massive powerfailure in the Northeastern USA and extending into Canada. Our Canadian Internet Service Provider’s (ISP’s) hardware, the actual residence of our site, was plugged into the failed grid. The IHS site is back up now that power to our ISP has been restored. Hopefully this ISP will develop a remote backup capability that can come on line if the main computers cease to operate. It appears that no email to or from the site was lost (though delivery was delayed). We regret any inconvenience due to the outage.

[Date/Time=08-15-2003 – 11:55 AM]

Name:Barney C Black, [Msgid=488408]
Maintenance Outage 21 Aug 03

      • The recent problems with the power blackout in eastern USA and Canada was a “wake up call” for our Internet Service Provider (ISP) and many others. As a result, our ISP is making significant infrastructure investments to upgrade their Data Center. This will all be turned on Thursday, August 21, 2003 with the result that the IHS website will be unavailable between 10 pm and 2am (Eastern Daylight Time). This upgrade will yield significantly higher levels of protection from outage due to floods, fire, or electrical failures in the future. It will also provide improved global network speeds for site visitors. Your patience, understanding and support during this scheduled outage are greatly appreciated.

[Date/Time=08-20-2003 – 8:51 PM]

Name:Barney C Black, [Msgid=491450]
Advanced Marine Vehicles CD-ROM #2

      • New!!! Advanced Marine Vehicles (AMVs) CD-ROM # 2
      • This AMV CD-ROM # 2 has 61 documents with 8650 pages:
      • 30 Documents on Hydrofoils.
      • 11 Documents Applicable to Multiple AMV Types.
      • 17 Documents on Air Cushion Vehicles (ACVs) and Surface Effect Ships (SESes).
      • 3 Documents on Planing Hulls.
      • 12 Rare Documents on Advanced Ship/Boat Design with Data.
      • Note: Priced at $12.00 for IHS members; $15.00 for nonmembers.
      • AMV CD-ROM #1, the first in this series, is still available.
      • IHS is making available this CD-ROM collection of technical documents on Advanced Marine Vehicles. These documents have been generally unavailable, as they were in private or government files and archives. It is the Second of a series planned to be produced.
      • IHS accepts payment by personal check, bank check, money order or cash.
      • We have also arranged for payment by credit card (online only!) at

      • .
      • The price includes postage, regardless of destination.
      • Orders must be pre-paid.

[Date/Time=08-21-2003 – 7:10 PM]

Name:William White, [Msgid=491987]
Role of High Speed Craft in the USMC

      • For IHS members in the Greater Washington DC Metro area, the IHS quarterly dinner meeting will take place on Thursday 18 September 2003 at the Days Inn, Crystal City, Arlington VA. Go to

      • for the full announcement and details.
      • Cost of the dinner program is $25.00 per person. Menu: Rolls, Garden Salad, Marinated Chicken Breast, Green Beans, Rice Pilaf New York-Style Cheesecake, Iced Tea, Coffee.
      • The speaker will be LtCol Lawrence Ryder. LtCol Ryder will present an overview of High Speed Vessel (HSV) employment in Operation Iraqi Freedom and in Horn of Africa Operations. LtCol Ryder will discuss the growing importance of high speed craft in the implementation of Navy and Marine Corps transformation efforts. He will also provide an overview of the capabilities of the Navy and Marine Corps’ newest ship, HSV 2 SWIFT, which was delivered 12 August 03. Finally, LtCol Ryder will provide an update on the Marine Corps’ long-term goals for high speed craft.
      • As usual, the meeting schedule will be Social Hour/Cash Bar: 5:30 – 6:30pm; Dinner: 6:30 – 7:30pm; Program: 7:30 – 9:00pm. Make reservations no later than September 15 (Noon) if you plan to attend. Contact: Dave Kaysen: 301-775-2458,

      • ; or Bill Hockberger: 301-699-5137,

[Date/Time=08-26-2003 – 7:02 PM]

Name:Barney C Black, [Msgid=494668]
Re; Re; Compuserve Bans IHS

      • Perhaps to get your site noticed on Compuserve, you must subscribe. Although it was free of charge, the search engine Hotbot required users to register if they wanted their pages to get hit. It could be that the IHS has simply chosen not to pay a fee to Compuserve when Google will hit their site for free.

[Date/Time=08-31-2003 – 4:31 PM]

Name:Mike K. ame2000, [Msgid=497703]
Date Change – IHS Dinner Meeting

      • In view of the approaching hurricane and its possible effects on our area, we have decided to delay the joint IHS/ASNE SD-5 meeting one week, from Thursday, September 18 to Thursday, September 25. Everything else in our original announcement remains the same: location, time, menu, speaker and topic, etc. See the revised announcement at

      • .
      • For those who were unable to come on Thursday the 18th, perhaps you can attend now that the date is moved to the 25th. If so, please make a reservation.
      • We hope that people who made a reservation for the 18th will still be able to come on the 25th, but we cannot assume this. It will be necessary for you to reconfirm (or cancel) your reservation for the new date by calling or emailing either Bill Hockberger (

      • , 301-699-5137) or Dave Kaysen (

      • , 301-775-2458).
      • For anyone who is inconvenienced, we regret the necessity for these last minute hurricane avoidance maneuvers.

[Date/Time=09-16-2003 – 8:50 PM]

Name:Bill Hockberger, [Msgid=508553]
Autumn 2003 Newsletter


      • The Autumn 2003 edition of the IHS newsletter is available to IHS members from the website at


      • . An email notice was sent to all members for which we have working email addresses. If you are a member and missed the email announcement, send an email requesting the password to

      • . In particular, a few recently-joined new members may not have gotten the email.

[Date/Time=11-21-2003 – 10:20 PM]

Name:Barney C Black, [Msgid=548422]
Meeting – Seaplanes for Seabase Support

      • For hydrofoilers and others in the metro Washington DC area, IHS will sponsor a dinner meeting on December 9. A presentation on Seaplanes will be given as follows:
      • The Center for Innovation in Ship Design was tasked by the Office of Naval Research and NAVSEA 05 to investigate the utility of seaplanes for supporting an offshore seabase. Our speakers will outline the history of seaplane development and operation and then present the main results of their study. They will discuss the potential uses and importance of seaplanes for future seabased military missions. They will also identify current technology boundaries and technical issues that need further investigation, including those related to integrating seaplanes into a seabasing environment. Finally, examples of potential design concepts will be shown.
      • For details, see the attached Adobe Acrobat file.

[Date/Time=11-21-2003 – 10:27 PM]

Name:Barney C Black, [Msgid=548428]
Attached File  “” – size 9192   Click Here To Download
Re; Autumn 2003 Newsletter

      • hello barney my name is steve and i have a small problem. about fifteen years ago i purchased two hydrofoil kits and had evey intention of building them and because of family duties i was never able to get to them. it is now fifteen years later and i was looking for help in order to build these and i realize through your web site that these are rare models and someone who really knows what they are doing should build them. i do not wish to make any profit on these kits , but i would like to see someone who would do the right thing recieve them , unless i could get help and buid them myself. please advise me . they are by the way the Hegi Police hydrofoil rc ship model and the32nd parallel Schnellbopte model. once again i am not offering this as a joke of any kind i really have these two kits , i just never realized what was going on in the model hydrofoil hobby world. up until 24 hours ago i did not know there was a hydrofoil model society, after reading about the hydrofoil models i realized it would be better to talk to you before i did anything with these kits. the kits are complete with all parts and instructions and i have the origional bills of sale , made out to me. so it is in your hands , i appreciate your time and hope to hear from you soon . p.s. by the way i have not built a model in 20 years and even then i had my problems thanks again Stephen Mc Donald New York U.S.A. if you need photos i will send upon your request

[Date/Time=12-13-2003 – 2:29 PM]

Name:Stephen Mc Donald, [Msgid=558639]
Thai Hydrofoil Venture Investor Sought

      • Message for Thailand Hydrofoil business opportunity,seeking investor, placed in “Sources,Buy/Sell:Brokers-Builders-Designers-Operators” section.

[Date/Time=04-20-2004 – 12:28 PM]

Name:Garry Fry, [Msgid=633917]
Thai Hydrofoil Venture Investor Sought

      • Details of this message posted in the “Sources,Buy/sell:Brokers-Builders-Designers-Operators” section.
      • If you look closely at the attached photo of Maya “The Beach” Bay you will see the RHS 70 hydrofoil at anchor in deeper water.

[Date/Time=04-20-2004 – 12:40 PM]

Name:Garry Fry, [Msgid=633923]
 Image Attached:  “MayaBayPhiPhiIslands.jpg”   Click Here To View
underwater noise level re;dugongs


      • I’m trying to translate a document from Japanese to English where, as a comparison for the underwater noise level produced in a seismic survey (145dB at 100 metres), is given the noise level of a hydrofoil (146db at 100metres).
      • I realise that the dB scale is not the same as for dB in air, but not how or why.
      • What I would like to know is; Is this a realistic figure? What kind of hydrofoil would this be for? Or is the wool being pulled over my eyes? Are the operators of the survey trying to convince us that the noise level is not significantly high?
      • By the way, there are dugongs in the area which are in danger of extinction and may be affected by loud noises.
      • For more info on the problem see
      • Thanks for your time.

[Date/Time=05-17-2004 – 9:42 AM]

Name:Simon Varnam, [Msgid=648647]
Re; underwater noise level re; dugongs

      • Simon,
      • My familiarity with noise measurements is limited, however for airborne noise monitoring there are different scales that are used to account for different applications. Humans for example can tolerate noise pressure levels better at some frequencies than others. If I recall correctly, the dB(A) scale is often used when measuring the impact of noise on humans. This scale weights the noise level differently for each frequency component being measured before adding their effects together.
      • I would say that the same would apply for marine animals, namely that Dugongs could also handle noise levels better at some frequencies than others. Comparing the noise level measured for a hydrofoil (which could be expected to be fairly broad banded) against the output of a seismic system (which may be very narrow banded and in a frequency range harmful to the animal?) could therefore be problematical… regardless of how the dB measurements compare.
      • Good luck with you quest for a sound assessment of the risks in this case. By the way, you seem to have forgotten to include the website link you intended to provide.

[Date/Time=05-24-2004 – 10:26 AM]

Name:Martin Grimm, [Msgid=652999]
Re; underwater noise level re;dugongs

      • I could not help analyzing the noise issue because I doubted seriously the noise measured by the Japanese report can be attributed to the hydrofoil principal alone, and had some potentially useful measurements of my own for comparison.
      • From

      • , I find the comparison from air to water is +62db for water. The example cited is a supertanker generating 190 dB is roughly equivalent to 127 dB in air. Ambient noise for the open ocean is 74-100 dB. A blue whale also generates 190 dB. They don’t list what Dugongs emit…..
      • While the frequency would probably not necessarily be ‘broadband’, the likely source for a hydrofoil (alone) could be the turbulence in the boundary layer surrounding the foil, various turbulent eddies from vortices, cavitation, ventilated surface bubbles from surface piercing, etc. Weightings may be used (comparing sound levels to the sensitivity of the human ear)and included in the measurement, but any weighting scheme should be reported with the results. Also, the propulsion system (props, water jets, etc.) or support generator sets, etc. would be a major noise contributor.
      • The peak to peak amplitude of a time history of surface pressure can be estimated by 4 times the RMS (or also closely by Std Deviation) of the time history, then converted to Db by 20*Log10(P1/P2), P2 being the reference pressure which is 1MicroPa for water. We recently did some dynamic pressure measurements on the surface of a hydrofoil to measure transition of the boundary layer from laminar to turbulent, for which I have RMS values. A sample I looked at today measured 198 Db average (broadband) at 25 Knots on the foil surface itself. The number was similar for 15 Knots. The above web link relates transmission loss as the sum of spreading and absorption loss. The absorption loss is variable with frequency. Neglecting any absorption loss, 198 dB at the surface translates to 4.9 dB at 100 meters. With absorption included the number is smaller yet.
      • So, if the foil system is sub-cavitating and operating in a cavitation free operating envelope, my opinion is the foils themselves are highly unlikely to cause such a noise level alone.

[Date/Time=05-26-2004 – 3:37 PM]

Name:Rick Loheed, [Msgid=654516]
Re; underwater noise level re;dugongs

      • Many thanks for the advice.
      • BTW Rick, my e-mail of thanks was returned. Maybe your mail box is full.
      • Best Wishes
      • Simon

[Date/Time=06-02-2004 – 10:40 PM]

Name:Simon Varnam, [Msgid=658001]
IHS Newsletter Call for Inputs

      • To All IHS Members,
      • For several years I have served as Editor of the IHS Newsletter and have struggled to obtain appropriate articles to place in the Newsletter each quarter of the year. Martin Grimm, our Sailor’s page editor, has been a great help, not only for such articles, but others as well. Others of you have also contributed material from time to time, and this has been appreciated.
      • The purpose of this message is top solicit you greater support for interesting hydrofoil material — particularly NEW and upcoming events and designs that are not published elsewhere (like FFI and Speed at Sea).
      • Therefore please send me such articles. A single to 1 1/2 pages including a picture or two would be great!! Of course there is no guarantee that your article will appear in the very next issue of the NL, but we will make every attempt to fit it in ASAP.
      • My best regards and thanks,
      • John Meyer
      • IHS Newsletter Editor

[Date/Time=07-12-2004 – 8:33 PM]

Name:John Meyer, [Msgid=678443]
Engine Torque

      • I’m currently reviewing a design for a small one-person hydrofoil powered by a 15hp-25hp long shaft outboard. The question of engine torque has arisen and the need for an engine mounted torque converter however; in reading a lot of the design material on these pages (excellent guidance by the way) I have yet to come across this issue being discussed. Is torque a major design consideration on small (<9 feet) hydrofoils?

[Date/Time=07-27-2004 – 11:14 AM]

Name:Philip, [Msgid=685371]
need help putting foils on 40ft cat

      • Hi folks, I am consinering putting foils on my 40 custom power cat (aluminum) I need some help with the design of the system and foils, if there are any experts that would be able to give me some advice please email or call me 904-669-8488

      • thanks Gene Echols

[Date/Time=08-19-2004 – 7:50 AM]

Name:gene echols, [Msgid=696531]


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