finaly have the boat at a stage which im willing to show you guys
When the Apprentice knows more than the Mentor its time to quit!
sorry guys the image is huge but ah well what do you guys think?
keel might be a bit long 800 mm
lead 1 kg
hull lenght is around 1300mm
When the Apprentice knows more than the Mentor its time to quit!
Wow! Long keel! Looks good Michael! Does the keel cant? Have you tried the mechanism yet? What will you use for the extra lateral resistance(if anything)? It seems possible that with the depth of the keel it may have more lateral resistance than necessary so the amount it loses in canting may not hurt too bad-what are your thoughts?
Doug Lord
–High Technology Sailing/Racing
yes it does cant and i was hoping that would be the case of not having to add any more lateral but if all else fails ill just chop a third of the keel and make it a cktf the only problem is that it might have a funny effect of triping over the keel side ways if you get my drift
When the Apprentice knows more than the Mentor its time to quit!
Keep in mind that twin foils with canting balast offers a tremendous potential upwind advantage since it dials out leeway allowing the hull to go straight thru the water instead of crabbing. Further it allows the keel fin to just be a strut also going straight thru the water with no sideways movement and hence no induced drag.
In other words a deep fin still needs to be thin and very stiff but the drag of such a fin is cut way down if you use a twin foil system equipped with collective control; but that requires a radio with mixing capability or a mechanical mixer(which is simple and precise) but weighs more…
Doug Lord
–High Technology Sailing/Racing
That keel seems very long indeed. Besides the fact I wonder if its length is needed I would like to know if it’s stiff. I certainly hope it will not bend when heeled.
Nice job on the hull btw.
Greetz.
Wim
What angle will it cant to?
Luff 'em & leave 'em.
Hey Matt,
If I remember Michael told me that it was gonna cant 55 degrees from the centre line
Something Is Nothing and Nothing Is Something!
cant is about 45 to 50 limited by my leaver arm lenght dam thing just blew up tray holding winch dam thing delaminated then parted of the hull. wasnts strong enought ah well back to the design stage again only set me back about 4 weeks the stupid thing. hull needs a nouther undercoat dam kevlar so blody fluffy (note to self kevlat is about the same price as carnbon dont use it any more)
When the Apprentice knows more than the Mentor its time to quit!
there is about 4 mm of keel bend with the bould weight on at 90 degrees thich im happy with thickness is around 6-7 mm with a balsa core with uni carbon vac baged. the keel is long but ill wait and see how it goes and i can always take to it with a hack saw:P im just worried about the hull tripping over the keel because its so long ah well ill have to wait and see matt how much cant did you end up with? how did the hitrc winch handle up to the job??
When the Apprentice knows more than the Mentor its time to quit!
Micheal
I had great trouble when i did my first F100 canting keel and just getting everything mounted right. I used a Hitech winch on a 2:1 purchase and was getting about 50 degrees. The winch ws at the top end of its working load and I was canting 2kgs with a 80mm lever through the boat so it would be interresting to see if it will do yours it would appear that you don’t have a lot of lead on the bottom though.
My new boat uses a gear system and the same winch as the number of truns that the hitech winch gives with a futaba system is about 4.5 turns and this works out sweet to cant to 50 degrees.
any way hope all goes well
Cheers Gappy
I get somthing like 53 degrees, the winch is ok, it does the job and is quick enough. I wouldn’t not use it on anything much bigger though. The keel strut on my boat is pretty long too, I think it does push the bow down offwind being so long with only 500g on the bottom.
Luff 'em & leave 'em.
what sort of line are/were you guys using on your systems? im using 2mm spectra line with the core striped of and spliced around my leaver but im not happy with it way to much initial strech so i might try the 1.6mm vectran but i dont think i wll be ble to splice it so ill have to tie a knot(more to go wrong/break/get tangled)but its a lot nicer and will be able to keep the core wich will meanless wear on the core which will mean less times i will have to replace the silly thing
Never hold your farts in.
They travel up your spine, into your brain,
and that’s where sh*+y ideas come from.
I use 1mm(90lb-41 kg. test) spectra line coated with silicone. The line works well in high load rc applications like ck’s and spins . On Ck’s its a lot less hassle if you "pre-creep"the line. Spectra doesn’t actualy stretch it creeps-only so far then acts like wire from then on. If you take some of this line and hang a two or three kg. weight on it for three days it won’t “stretch” any more.
Doug Lord
–High Technology Sailing/Racing
why dont you get pre-strechts lines? like Laser pro??? check Kite shops
Wis
_/ if it isn’t broken, don’t fix it! _
Spectra doesn’t actualy stretch it creeps
doug you might want to look that one up
Unfortunately, the process is not quite perfect and this leads to a phenomenon known as ‘creep’. Though the initial stretch of HMDPE is very low, if one leaves a HMDPE rope loaded for a long time it slowly but inexorably stretches, never to return to its original length. While this is not a problem in lines that are adjusted regularly it can be irritating in applications where stability is important (eg the main halyard).
care of http://www.cncphotoalbum.com/rope/
Never hold your farts in.
They travel up your spine, into your brain,
and that’s where sh*+y ideas come from.
or i will just use the vectran
a very strong fibre with minimal stretch and no propensity to creep
Never hold your farts in.
They travel up your spine, into your brain,
and that’s where sh*+y ideas come from.
Michael, according to my Line Guide Vectran does have a small tendency to creep; apparently not as much as Spectra though (and that is very small)
Can you get 1mm Vectran?
Doug Lord
–High Technology Sailing/Racing
i can get 1.8mm vectran with a case( suposiadly used in leech lines of keel boats but i recon its a bit small for that omore than likly the kite borders will use it to chop each outhers head off or get droped in to trafic(hehe)) but once i strip the cover it will be around 1mm but i dont know if you can get it 1mm of the roll have a loot on the net.
Never hold your farts in.
They travel up your spine, into your brain,
and that’s where sh*+y ideas come from.
Micheal
I have been down the same route that you have tryed and rope just does not cut it. I used 1mm flexi stainless wire and crimped the end and i have had no stretch and it works great runs freely and does not chaffe like the spectra tends to as the lever goes throughs it ark and angles to the blocks change. I also found that by using the small bearing raced model blocks it reduced so much friction in my system .
any way hope it helsp you out.
Cheers Gappy