shortening rudders

[wingnut]

i'm setting up a ss 45 and need to shorten the rudder . should it be flat on the bottom or round ? should it be 90 degrees to the back of the blade ?

 

[BobGutsell]

Don't mean to hijack your thread wingnut, but on a similar note, is there any rule of thumbs about how far the bottom edge of the rudder blade should extend below the bottom blade of the prop?

 

[Tom w]

.

 

[wingnut]

it's a speedmaster wedge.

 

[FloridaScaleBoater]

I leave them flat, it's then a planing surface, creating lift in the transom

90 Deg to the back edge of the blade

I start with the blade about 1" deeper than the prop blade @ B.D.C.

Rick

 

[wingnut]

i thoght i remember someone telling me that about it being a riding surface. thanks for the advice

 

[BobGutsell]

Thanks guys, I'm actually using a straight blade for a mono, sorry, I know this is a hydro forum. Does the same 1" rule still apply.

 

[SayMikey]

Thanks guys, I'm actually using a straight blade for a mono, sorry, I know this is a hydro forum. Does the same 1" rule still apply.

Its flat did i leave the old blade with the boat?

 

[FloridaScaleBoater]

To tell you the truth, I can't remember?

The last few MONO's I've built have beed Seaducers, and Jerry's instructions give you a specific place on the transom to mount the rudder, and then a specific amount to cut off the blade.

And I never took note as to were it ends up in relation to the prop.

Rick

 

[wingnut]

ya mike the old rudder was in there. i asked mostly out of curiosity. the old blade has a little bitof and angle on the bottom. the front of the blade bottom is lower than the rear. i was curious of it's effects.