[quote=tamumpower1]I talked to Randy Smyth about tramps once and he said on a non deck sweeping main setup, eg. theres no end plate effect to be gained, that a solid tramp would just create more drag and be slower than open netting. So if you have an old style cat the name of the game is getting the most breathable material you can use. But not open netting with holes so big your mainsheet would fall through.
I've thought about doing a park avenue boom to end plate the bottom of the main but I'm not sure if the added drag would outweigh the benefits. I might do some testing and see what happens.
[quote=ctcataman]Has anyone played with lowering the boom with a conventional main to get the deck sweeper effect? It would make crossing over more difficult, but if the gooseneck fitting went 50% lower, I wonder how much performance would be gained? Our Tornado is a fun boat so class legal isn't a comcern.[/quote]
The boom on my square mounts all the way down at the beam, but at the angle you need to still get under the boom at the back it still leaves a huge area for air to leak around and create vortices. Unless the sail is essentially completely sealed the effect is minimal from just moving the sail lower. You really need to add some material so you get the front half of the sail touching the deck.
I wouldn't just lower the main/boom down the mast solely to get it closer to the tramp because you're moving the sail into slower air all the time. Because the A class has to give up some area in the upper area of the sail to move it down low, the A's that run a DS setup are generally slower in light air. And from what I've read on the A forums I believe it's still up in the air if the reason they are faster in heavy air is due to end plate effect or just the fact that they have a lower center of effort and can carry more power due to more sail area down low.<!-- editby --><em>Edited by tamumpower1 on Nov 27, 2017 - 04:07 AM.</em><!-- end editby --> [/quote]
No HTML tags allowed (except inside [code][/code] tags)
