Luc
1. That is my shorthand. The brace is 60OD with 4mm wall thickness. It is 1.5m long.
2. I have taken the attached screenshot from the link that shows the bow although you get a better indication as he rotates the hull.
4. Rudder photos posted on another email.
5. I have commented on your diagram in a separate email.
You need about 70gsm on the diagonal axis to resolve the 30kNm torque. If you use 450gsm triaxial then that gives a margin. Obviously reducing the height of the windward hull will lower its enclosed area so the stress for a given torque increases. Be mindful that the hull needs to transmit torque between beams and rudder and beams. Also mast and beams if they are not directly connected. The rudders can generate the overturning moment in the condition of sliding down a wave.
Rick
On 26/04/2016, at 3:48 AM, lucsimard@ymail.com [harryproa] <harryproa@yahoogroups.com.au> wrote:
Rick,1. I guess it is a typo and it is 6mm thick wall stainless tube ?2. I posted the bow shape link just to try to "see" the form you were describing ... the facebook link you gave me does not work but I remember now posts and images of your work, side mounted properler with curved driving shaft. I was very impressed by the "out of the box" thinking when I saw those !I saw on your page design V15-58 and found Joe Tracy's V16-64 pictures and I see now what you are describing.I also stumbled on the Pedal power for a HP of June last Year while looking for more info on other of your posts I remember for hydraulic steering gearbox. Must say I love this and my girlfriend also ! A good workout when there is no wind is a great idea. (I think she would pedal even if no wind !) You can be 100% certain that this is going to happen on my future boat ! (I even started to add the weights in my excell sheet) I cannot see the picture of your June 28, 2015 post "bit further development of the pedal drive idea suited to the Cruiser 60 with a cockpit or deck well" ... could you send it to me please ?One setup for pedaling the hole boat or only the tender would be even better.Untill now I just drawn the simplest shape I could for bow. I noted down all your recommandations so far and once I get to specific hulls bow form of the design, I would be very thankful for any more advises.4. Thanks for asking Nol. Noted for the steering system continuous rotation, make sense.5. Ok, I think I understand now how you calculate the force, thanks ... please see attached drawing for how I resolve forces, anything I am doing wrong ?The 200 gsm triaxial I guess in on top of the "normal" 450 gsm on both side of a 10 mm foam ?I still need to reduce the height of the lw hull because the cutout in the bridgedeck to fold the lw hull has taken out way too much space inside, and I do not want to increase the length of the bridgedeck. I am now up to find out the weight of a 15m long by 700 high lw hull knowing that it is not going to be the lightest it can be :-(Thanks,Luc
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Posted by: Rick Willoughby <rickwill@bigpond.net.au>
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