Amayotte asked me for dimensions of my C26 rudder, I'm posting them here so they are available if anyone else need them in future. This model have the save draft as the swing keel raised, does anyone know if it made by Crysler or a custom part?
It is made of foam with one layer of biaxial cloth (9 oz maybe... not sure). If I was to make a new one I would probably use a NACA profile to increase the performance, but it's working allright as-is. I do not know the internal structure. Let me know if you dont understand the measures, this is not the best technical drawing Ive done!
Heavin's to betsy that's quite the beast you have there, if it won't turn the boat then ain't nothin gonna turn it It's got to be a home brew, all the ones i've seen so far are swing. Clearly the length is a trade off to shorten it up and the position on the shaft helps to keep it from being to heavy handed when turning. I bet with a Spinnaker up (maybe even without in heavy air) on a Broad Reach or run it would still build up your arm muscles?
Banshi wrote:I bet with a Spinnaker up (maybe even without in heavy air) on a Broad Reach or run it would still build up your arm muscles?
Did not had the occasion to try a spinnaker so cant answer, but with main&genoa it has never been heavy. I'm not soooo sure it's home-made as I vaguely remember to have seen picture of another boat with this rudder..:/
If anyone has occasion to remove the keel shoe brackets, please please please take good pics, and I'll post them on chryslersailing.lizards.net. You might consider making a plaster cast of them, too, which would simplify making new ones. I'm particularly interested in what the keel / shoe mating surface is like, since in the drawings it appears the keel itself is concave there.
I want to replace them on Windward... don't trust them or the keel pin that well after all these years, but would like to have some new ones fabbed up prior to getting into it. Were I to replace them I'd like to use something like lead and epoxy to fill and fair the exterior, adding a few more pounds of ballast in the process. I'll bet another 20 - 50 # down there would make a difference when life gets puffy.
Jeff, if anyone bites with the keel bracket info, I'm in for a set also. I hope to chip off all the rust, fairing material etc to see what it looks like this spring. I'm not real confident of what I will find. I bet there are quite a few of us who'd like a set to go. Drive the cost down considerably.
Update: I've been able to test the boat more recently and have found some limitation with this rudder. When the boat is heeled so that the rail touch the water, the rudder is partly in the air and with this limited surface the boat turn to the wind
So...not the best model if you want to race, but if you are often in shallow depth, this is still a good option, the boat steer fine in more normal condition
How were you heeled in your best upwind performance? When I had enough wind to test, I seemed to gain a bit of speed when the rail go to water level, but could not stay this way long enough (rudder and lack of wind) to test the limit to get optimum speed
Is your shoal draft rudder as deep as the keel when the keel is up? If not can you estimate how much shorter the rudder might be? I have been thinking about a rudder the same depth as the raised keel. This would be build with a weaker bottom section to prevent hull damage by the rudder shaft if grounded hard.
Guillaume,
I know it's been a while but I am now gathering all the parts needed to make a shoal rudder. I have some questions though.
Would you say that your rudder would work better if it was longer or shorter?
Is your rudder removable from the rudder post?
If it is removable how does it attach?
do you find that there is a lot of resistance or pull when steering, or would you say it is fairly balanced?
This is what I am thinking of doing for mine:
I was going to make it the same draft as yours : ~26"
I was toying with the idea of making it 36" long. Seems kinda long...not too sure.
I am either going to do a NACA0013 or NACA0015 ( with a 5% leading edge radius)
and I was going to make the rudder removable in case it doesn't work.
My boat has an identical rudder. It is split on the trailing edge from water intrusion into what lookes like plywood. I am taking it off and filling the split with epoxy, then glass cloth around the whole rudder. I too was worried how the boat would respond with the rail down in heavy seas. The preivious owner took the boat to the Bahamas three times, and didn't have any problems. I wounder if threre was a pattern or plans for these rudders at one time, as they look the same. mike
It's got to be a home brew, all the ones i've seen so far are swing. Clearly the length is a trade off to shorten it up and the position on the shaft helps to keep it from being to heavy handed when turning. I bet with a Spinnaker up (maybe even without in heavy air) on a Broad Reach or run it would still build up your arm muscles?
