Or is it that the forestay attachment is mid-deck?
bow on
shot to a normal hull
I give up. I can't see anything of note.
Maybe the hull is slightly asymmetrical on top? But I doubt it, it's probably an illusion from the angle of the shot.
Noone seems to have commented on the daggerboards being canted the 'wrong' way to perceived wisdom?
I think you're onto something there though as there will undoubtedly be some lift generated with that setup that should help in reducing drag.......
Have you done any theoretical calcs at a range of speeds?
Eh????
John, I see them canted in (so tips are closer than the top); Standard in the A class fleet.
Wayne, are they
true
in the hulls; some A classes have them slightly toe in to create even more lift.
Mmmmm now that is an interesting question, I tried to get them as neutral as possible but it is really difficult as you are no longer just pointing the dagger board in one axis and without really good optical equipment it is sort of an educated guess. I have left the dagger board cases quite big to enable a bit of shimming if I have to and my guess is that my sailing skills are such that it will be pretty difficult for me to really tell until some way down the line.
Good guess but not the one I was thinking. Keep guessing for the moment boys and girls, its not such a biggy but something I wanted to try.
Awesome, Wayne. Looks like Bitza will be on the water before Russell.
no self tacker...
what do I win?
No its not the self tacker that has been left off ( no good to a single hander and this boat certainly doesn't have the volume to be anything other than a single hander ) but something far more unfashionable.
I left the bow vertical unlike the very now fashionable raked back
wave piercing
bow that we now see on most F16 designs. At the time of building the hulls I had been breaking the Sprit wires at the front due to a very high and long angle back to the forestay that the early Stealths came with ( the later ones have the mounting point much lower down on the inside of the hull). Tremendous pressure was obviously being placed on these wires and by consequence the hulls. Proof of this was one of the Stealths at the club was showing deformation of the hull just in front of the beam. To overcome this I moved my Stealth's sprit wires as far foward on the bow as possible to get much better upward angles and thus less tension from the Spinny. Using the same diameter D12 I haven't had any break since.
Now we can either rake the bow back, put a lot of carbon and reinforcing in the hull to take the increased loading or we can move the mounting point as far foward as possible by leaving the bow almost vertical, I choose the latter as unless you are doing about 30 knots the true wave piercing bows simply do not work. I do understand why we narrow down the top part of the hull but it has nothing to do with wave piercing. <img src="<>/smile.gif" alt="smile" title="smile" height="15" width="15" />
Would I do the same if I was building another boat, nah raked back bows just look so much more ubber cool <img src="<>/cool.gif" alt="cool" title="cool" height="15" width="15" />
It's obviously not a biggy cause non of us can spot it!! It appears to be a fairly normal bow to me but in good condition.
Have a look at this photo and see if you can spot the mistake, this is a little easier for us but a bit more embarrassing for Wayne.
Oh now Mark that is so mean. <img src="<>/blush.gif" alt="blush" title="blush" height="15" width="15" />
The mistake is obviously the fact that Wayne is using a purple spinnaker...
The mistake is obviously the fact that Wayne is using a purple spinnaker...
The mistake is that he forgot to put on a shirt <img src="<>/laugh.gif" alt="laugh" title="laugh" height="15" width="15" />
The mistake is that he forgot to put on a shirt <img src="<>/laugh.gif" alt="laugh" title="laugh" height="15" width="15" />
Ooooo, I was itching to say something like that, but I am too nice <img src="<>/grin.gif" alt="grin" title="grin" height="15" width="15" />
I would say something clewless but that would be tacky.
Lack of sunscreen?
Very beautiful.
Would I do the same if I was building another boat, nah raked back bows just look so much more ubber cool <img src="<>/cool.gif" alt="cool" title="cool" height="15" width="15" />
Raked back bows looks cool now, but when the fashion trend is over, it looks as old school as a Dart 18. Seeing that you use your brain rather than following the trend makes the boat even more beautiful.
With the A-cat mast (9m length?), what is the final weight? 85kg?
Cheers,
Klaus
Would I do the same if I was building another boat, nah raked back bows just look so much more ubber cool <img src="<>/cool.gif" alt="cool" title="cool" height="15" width="15" />
Raked back bows looks cool now, but when the fashion trend is over, it looks as old school as a Dart 18. Seeing that you use your brain rather than following the trend makes the boat even more beautiful.
With the A-cat mast (9m length?), what is the final weight? 85kg?
Cheers,
Klaus
Oh I like that, nice comment on the boat rather than the tacky clewsy bit, yes I did have the spinnaker back to front when first putting it on, wasn't thinking very straight after the cider offered for a liquid lunch by guess who.
Talking of weight, I think the central beam has a lot of merit, it saves a lot of heavy components and if the forestay is added into the equation, it means a proper working jib and a screacher rather than the spinny we now use. The beam and front pole is only about 2 kilos at the moment so lighter than a conventional snuffer setup. Anyone out there good at converting loads to carbon fibre layup ?
Okay, now I'm lost. I don't see how the central beam is saving that much weight? Not to mention that you were probably the one who removed it from the 5.2 I have in my back garden when it was yours...
What are the advantages of the central beam and under tramp snuffer? I can see the following:
- Reduced weight and reduced windage on front, centering the mass is always good.
- Self sustained pole is probably real nice™ when rigging, one less thing to attach around
- Solid attachment for central sheeting (I'm curious to see how well it works as you still need to throw the extension on the back of the boat. I guess if it works for the A class, it can't be that bad)
- Rigidity? Is it really helping?
There are inconveniences probably:
- Lower clearance under the trampoline, the central beam may slap in waves?
- You have to either pick a side to launch the spi or forget about the jib completely and install split forestay. BTW, if split forestay are installed with no line from the mast to the middle of the pole aren't you afraid the pole is going to invert? How are you inducing pre-bend?
- launching and snuffing the spi may take longer as well as you have to pull all the length of the pole...
- You need extra long spi sheets to go all the way back to the trampoline
Anyway it's really nice to see something really new for a change, and I must admit I'm curious to see the results. Can I get a ride? <img src="<>/smile.gif" alt="smile" title="smile" height="15" width="15" />
Another tid-bit for Rolf. We discussed this boat some time back and now it's being readied for a new life!
http:/
A beautiful and very interesting boat, well ahead of her time. Hopefully her time have come this time over. Thanks for letting me know. Will be very interesting to see how she comes along.
Have a look at Hakan's latest attempt at a A class with Spinnaker on www.catsailor.com/
Interesting to read he can get the boat out of the water on its curved foils, pity I cannot afford the money to go all out as he has done. 20 knot plus already so it is definately fast.
Bitsa has finally gots its bits wet, had a first sail today in low winds and surprising not to much to tinker with. Quite pleased in a way as the boat is very much not far from final settings with an almost neutral helm and seems to be doing most things reasonably correctly.
One thing for sure though you really need to be in the middle of the boat, as as soon as you get near the back you can stand the boat on its butt sinking the transoms really easily, mind you the Stealths do have a big wide fat bottom so you can't quite compare like for like.
The Spinny under tramp snuffer seems pretty cool and as yet hasn't failed to work which is a surprise as its a quite different approach to things.
I plan to sail again tomorrow and sorting out a few things so hopefully will get some on water time <img src="<>/smile.gif" alt="smile" title="smile" height="15" width="15" />
Ooooo!! Great stuff! Please give us more <img src="<>/smile.gif" alt="smile" title="smile" height="15" width="15" />
(And pics of the under-tramp snuffer in its operational state)
I am very envious of you. Last night I pulled about 1500 staples and tonight I have been sanding..
Damn, I'm stuck at home with the kids, I would have liked to see this thing in the flesh...
You didn't miss much Pepin, Friday nights rather long frivolty time imbibing rather too much
Henley Gold
and an early morning start Saturday meant that looking out the window Sunday morning and seeing doom and gloom weather wise, meant a very instant decision of staying in bed for an extra hour or two of kip. Went to the Rugby in the afternoon so no sailing. <img src="<>/cool.gif" alt="cool" title="cool" height="15" width="15" />
I very nearly did exactly the same, but am very glad I didn't - you missed a great morning's sailing.
Looking forward to seeing Bitza on the water.
Paul
Very cool Wayne. Its gotta be quite an accomplishment to design, and build your own boat. I know I don't have the patience to do it.
News says ya got snow already. <img src="<>/frown.gif" alt="frown" title="frown" height="15" width="15" />
Snow is beautiful. It is not too cold to sail before the water freezes solid.
Take a stroll over to SA. <img src="<>/wink.gif" alt="wink" title="wink" height="15" width="15" />
(scroll down a bit)
http:/
At least the beer is cold <img src="<>/laugh.gif" alt="laugh" title="laugh" height="15" width="15" />
(so that is why the brits drink it lukewarm)