groper wrote:Great work 44, looks fantastic.
Could you explain how the kick up rudders work and how they're built?
You can get a fair idea of how mine work by looking through my build thread.
The hydraulic cylinder and tillerhead are inside the cassette, which can pivot up. There's simply some flexible hydraulic hose connecting them.
I made the cassettes tapered so they have a positive 'fit' in the locked down position.
They're simply held down by dowels. Hit something solid and the dowel breaks, releasing the rudder to lift.
On School's Out they have mechanical steering, so it's a bit different from mine. Essentially there's a push/pull rod attached to a pivoting tillerhead on the ruddershaft.
The pivots for the rudder cassette and the tillerhead must be on the same plane.
Theoretically this setup shouldn't steer unless the rudders are fully down. (You really need universal joints) But with just a little freeplay in the system it will steer up to about 10' either way with the rudder raised slightly or free floating.
I recently installed kick-up rudders on to a Schionning 1160 which didn't have them. I also enlarged the rudders, they were very small, (although correct according to the plans) and the owner complained that they weren't effective, losing control in gusts when broad reaching.
We actually had some little stainless universal joints made. I'll take some pics later and post them.