Devotti Single Hander

Whoops Doug,

I should have mentioned that the boat that Sten is sailing has an older development mast which is much softer than the production mast.

Originally posted by Rockhopper Great video rodney and sten still looks like the mast goes along way over the bow i know when its blowing my vareo does the same thing but at least it has shrouds to stop it are they at all worried about it doing this ???

Actually, all masts, even with shrouds, bend... The problem is the way they bend!

The D-One has a mast mutuated (but not the same) from the Finn, with a winged profile and with an external mainsail halyard (this help mantaining the mast completely sealed to prevent complete inversion during capsizing). Upwind, it works like a Finn mast, with a nice bend afterward that helps the sail to depower:



Downwind, here came the complications...

The pulling force from the genny can cause the mast to bend forward and leeward, powering the main and causing at the extreme the mast to break. You can prevent this in two ways: putting shrouds on the mast or making the mast very stiff. In the first case you can make the mast softer and bendier, so you can control it with few tweaks; in the second you have to play with precise positioning of the halyards exits (that's why the final production D-One sports an higher genny head point and different profile for the asymmetric ) and with gadgets like vang, cunningham and traveller. Then more speed you achieve, more your apparent wind will shift toward bow and your mast will suffer less pressure.


Edited by matbard

The more the boat accelerates the less I would have thought it an issue as it
will release the pressure on the mast. How it copes with a high speed
pitchpole however, will be very interesting indeed. It will either be a big
OOOPS or it will prove to be a very impressive mast indeed.

today sailing , long upwind 15 to 20 knots , d one jps 7 to 8 knots plus upwind!!!than lighter 8 knots wind  kite d one 10 to 12 knots. than wind up 12 knots d one 14 knots.......magical feeling , try yourself and than you will understand....now that forum will be more civilized , i will just sail ........ciao and come to torbole , aldo

Thanks mark. Much appreciated

D-one'ers
Is there any chance you would be able to get some D-one tacking and
gybing footage on camera and then on youtube or a similar site.
I've seen the boat going in a straight line but it would be good to see several
tacks in a row and several gybes in a row.




Edited by Doug.H