G'day, No problem with aerating up to 16 knots boat speed. My comments applied to traditional junk rigs, not yours, which I understand to be two surfaces....
Hi Robert, My rudders can't be lifted vertically but turned round the beam. Sorry about misunderstanding in my last message, English isn't my native language....
A thought I had on this subject Would a machined groove in the blade have a similar effect to a collar? That is to help prevent cavitation Rgs Tony ... From:...
Terho, I am curious about how the collar can work and still allow the rudders to be lifted vertically unless they are on the cheeks rather than on the rudders....
Hi Rob, Lanched my junk proa at last after winter today. I had to make collars into the rudders to prevent aerating. Did you have this problem with your...
... masts ... knocked ... Junk ... aid ... No, the side force is the same. ... Yes. ... No need for special rotating mast. My junk proa "Ping-Pong" has a very...
Hi, I am a bit confused too. The boat was measured for multi 2000 regulations. Data can be found at http://kotisivu.mtv3.fi/sctl/. It is not unusual to end up...
... the ... I don't think either is terribly probable. The 23 foot KHSD tri is 800 pounds, and that is a real number. If you chopped one ama off it would be...
Robert Don,t worry about the math because I think Ray is an engineer and may have done it already. I thought they might be weak torsionally but because there...
Hi DOug The reason is I didn't want seastays They cause lots of drag when underwater, add weight, cost of fittings etc, take more time to initially fit up,...
Tony, Idiosyncrsies of our medium of communication. That's the upper case omega- as used in electronics to denote resistance. The lowercase looks like a...
MessageNo, Ian uses form frames and glasses one side only which then requires the outside surface to be fully faired after glassing. We will be making a female...
Mark, Is the Elementarry building method similar to the Farrier vertical foam stripping building method? (http://www.f-boat.com/pages/construction/index.html) ...
Andrew Dickson
andrew@...
Jun 5, 2004 7:53 am
1016
Thanks Robert. Yes a lot of time, effort and experience goes into each part of the design and we contract the services of a very good composite engineer with a...
I guess I don't know really about other things that I haven't seen, tried or heard about. I wonder what you mean by ring framed etc. I built a beam (markI), ...
G'day Tony, I'm no certified engineer either, but what I said is right. I think you are saying that you made a hollow round section beam - for a proa? - which...
I'm not sure if upper or lower case but I tried to paste it as a symbol into the email and by the looks of it it didn't work. The symbol looks like a 0 with...
Horses for courses. It is hard to beat bamboo for ability to take loads and torque from all directions but if the bamboo was constrained with the load more in...
... You wrote - You have to make a box section, nothing else is remotely comparable. I dissagree I'm no engineer but I do have a tri with round beams Rob and I...
Hi!, Just building some trimaran cross beams, and want to talk about what I've found out. Apart from that I should be building a Harry proa - I found that in ...
One of the constraints for trailering is being able to fit the lw hull alongside the ww under the wing deck. If the ww hull was slighly fatter below with more...
G'day, Interesting. I emailed Michael (who runs the proa list on Yahoo and Proafile, the second best proa site on the web :-)) and got this back Hi Rob, I...
