fergal butler wrote:
Clarion wrote:
fergal butler wrote:
That "COD" is soooo sweet,
Is the rudder off the shelf or are they custom made, also can you tell me what angle your prop shaft is and what size prop you use.
Thanks.
The rudder is custom made along with the transom mounting brackets. We make our own patterns and have them cast in manganese bronze at a foundry in Toronto. I can't remember the exact size of the prop but with the 283 chev engine with a bit of a hotter cam it put out about 225 hp. So the prop would likely be 13 x 13 or 13 x 12 cupped.
Any chance you could send me the pattern for the one on the COD as I might be able to make one out of 1/2" aluminium
or can you give me a price to have one made, chromed and shipped to Ireland if possible.
Cheers, I'm a bit cheeky I know
but you have to be in this game
I can't send out the foundry pattern as hopefully we might have to use it again. There is a lot of force on the rudder and I don't think that aluminum would be strong enough. We cast the first rudder out of silicone bronze and it started to deflect so we had to cast another one out of manganeze bronze, a much stronger alloy. Perhaps you can make your own pattern and find a foundry in Ireland that will work with "loose pattern" and casts non ferrous metals. Just look at the pictures and make the pattern out of plywood, auto body filler, chewing gum, anything that will give you the exact shape of what you want the rudder to be. Don't worry about shrinkage, it is minimal and of no consequence in this application. Remember that a high speed rudder must be "wedge shaped" in horizontal cross section. About 3 mm at the leading edge and about 12 mm at the trailing edge for a rudder of this size.
Hope this helps.........Dwight
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