Search found 16 matches

by AlexQ23
Sun Sep 10, 2017 11:57 am
Forum: Technical Papers for review and comment
Topic: Howard Fund
Replies: 23
Views: 3457

Re: Howard Fund

Hi John! Thanks’ for your compliments. It’s an interesting topic you bring here. For sure, that when we select a keel profile we assume that it works in a laminar flow. But it’s true that it is rarely the case. However, I don’t think that the choice of a keel profile has something to do with the sit...
by AlexQ23
Fri Aug 11, 2017 6:23 pm
Forum: Technical Papers for review and comment
Topic: Howard Fund
Replies: 23
Views: 3457

Re: Howard Fund

Select the right keel profile. A few weeks ago I complete installation of Kasala keel inside his trunk. Everything was going fine and the simple lifting system I adopt, allows a 10 years old boy to raise or lower the keel. It’s a 6:1 pulley system install on top of the cab, completed with an externa...
by AlexQ23
Wed Apr 12, 2017 8:42 pm
Forum: Boats
Topic: MicroTransat
Replies: 13
Views: 2632

Re: MicroTransat

Good decision! If I could help I will be more than happy to joint the team. Suggestion: when you get all size and dimension of the frame, why not propose to members a kind of design contest as a first draft or so? And after that you can decide where to go?
by AlexQ23
Thu Mar 30, 2017 6:51 pm
Forum: Technical Papers for review and comment
Topic: Howard Fund
Replies: 23
Views: 3457

Re: Howard Fund

I’m sorry, but I never use a junk rig and I don’t know anything about it. But, what I know is that I never see any winning racing sailboat equipped with such a rig. Bernard Moitessier sails with such rig when young but he never keeps it on her later craft. A square top sail is quite specific. The to...
by AlexQ23
Thu Mar 23, 2017 6:45 pm
Forum: Technical Papers for review and comment
Topic: Howard Fund
Replies: 23
Views: 3457

Re: Howard Fund

Hello Robert, http://i66.tinypic.com/2uhu8vr.jpg For sure a wishbone could surely do the work too! But... - Some are not so effective for fine tuning the sails. - The reefing is not as simple as it looks - With a rigid mast and a square top sails they are not particularly recommended - When the sail...
by AlexQ23
Wed Mar 22, 2017 8:14 pm
Forum: Boats
Topic: MicroTransat
Replies: 13
Views: 2632

Re: MicroTransat

I think that if you think to build a metal hull it's mainly to increase the impact resistance, isn't it? For you information there is a coating available called Line-X that can bring any object almost unbreakable. And this is not propaganda! It works for real. And there is some representative in UK....
by AlexQ23
Tue Mar 21, 2017 8:55 pm
Forum: Technical Papers for review and comment
Topic: Howard Fund
Replies: 23
Views: 3457

Re: Howard Fund

I'm glad that you find the boat interesting! Unfortunately, the rig is integrally part of the project and another type of rig can not be fixed on those hull without affecting balance, stability and efficiency . But sails performances can be demonstrated with polar curves. Also, competing with other ...
by AlexQ23
Sat Mar 18, 2017 3:17 pm
Forum: Technical Papers for review and comment
Topic: Howard Fund
Replies: 23
Views: 3457

Re: Howard Fund

Few words again on roto-duplex rig: It doesn’t seem that this rig arouse much enthusiasm. But we all know that sailors are conservative and are allergic to drastic change. Wind is a free energy and trying to improve efficiency of a sailing arrangement is for poor interest for a great majority of us....
by AlexQ23
Wed Mar 15, 2017 8:01 pm
Forum: Technical Papers for review and comment
Topic: Howard Fund
Replies: 23
Views: 3457

Re: Howard Fund

On most catamaran the rudders are vertical. By contrast on beam transom monohull, the rudders are angling about 15 or 20°. This create some friction in mechanical linkage and increase the stiffness of the tiller. Diabolo rubber are often use to realize those attachment. With a duplex rig, like with ...
by AlexQ23
Tue Mar 14, 2017 12:41 am
Forum: Technical Papers for review and comment
Topic: Howard Fund
Replies: 23
Views: 3457

Re: Howard Fund

Well notice! Yes there is some pressure (or traction) on side mast base. This pressure could be estimated at 5000 N (1100 lbs) per side including an appropriate safety factor. In fact the rail is a hight quality grade aluminium "U" shape channel, perfectly bend and lay on his side on deck....
by AlexQ23
Sun Mar 12, 2017 3:33 pm
Forum: Technical Papers for review and comment
Topic: Howard Fund
Replies: 23
Views: 3457

Re: Howard Fund

http://i65.tinypic.com/t5shsp.jpg http://i68.tinypic.com/1178kk7.jpg Roto-duplex rig. Duplex rig also called twin cat rig or bi-plan rig consist of 2 masts lying side by side symmetrically at sheer line or mainly on each hull of a catamaran. This rig is rarely used on monohull due to the fact that,...
by AlexQ23
Fri Mar 10, 2017 8:29 pm
Forum: Technical Papers for review and comment
Topic: Howard Fund
Replies: 23
Views: 3457

Re: Howard Fund

A boat is a choice of parameters and you have to keep in mind that Kasala is a laboratory. I'm the kind of helsman who like to sail with a long stick up to my shoulder and between two fingers! You can not do that with twin rudders. The tiller is often tough and not really pleasant to handle. Minimiz...
by AlexQ23
Wed Mar 01, 2017 8:47 pm
Forum: Technical Papers for review and comment
Topic: Howard Fund
Replies: 23
Views: 3457

Re: Howard Fund

Hello! Here are the pictures of the oscillating rudder.
ImageImage
by AlexQ23
Mon Feb 13, 2017 4:43 pm
Forum: Technical Papers for review and comment
Topic: Howard Fund
Replies: 23
Views: 3457

Re: Howard Fund

Rather than words, a picture will show you what I call an oscillating rudder. But if you want to rename it, feel free! And here is the explanation I give in the presentation: “I decided to use a single rudder, even if the hull shape, from a plan view, looks like a wedge. With this kind of hull, when...
by AlexQ23
Sun Feb 12, 2017 7:18 pm
Forum: Technical Papers for review and comment
Topic: Howard Fund
Replies: 23
Views: 3457

Re: Howard Fund

Designing a small boat is not an easy task. The principal difficulty encountered comes from the weight of the crew members that could totalise almost half the entire mass of the boat it-self. The mobility of this weight compromised greatly boat lines and stability. So, imagine now, that you want to ...
by AlexQ23
Thu Feb 09, 2017 8:31 pm
Forum: Technical Papers for review and comment
Topic: Howard Fund
Replies: 23
Views: 3457

Howard Fund

Hello! I have a great project that I want to propose to Howard Fund. Is-it still active? Can we still submit some lines? If yes, will it be better to send it by mail or e-mai? Let me know. Thank you.

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