shovelnose hydro rudder Q

[Rex R]

so, on a mono the rudder's leading edge should be even with the drive dog...does this hold true for a shovelnose hydro? tia
rex

[G Doggett]

so, on a mono the rudder's leading edge should be even with the drive dog...does this hold true for a shovelnose hydro? tia
rex

YUP !
And at the risk of starting a controversy, IMO it should be mounted on the opposite side to the turn fin.
Graham.

[J Solinger]

I've seen them all over the place without any detectable performance difference. The idea is to locate the rudder so it doesn't disturb the water going into the prop and keep the water coming off the prop from disturbing rudder control or creating drag against the rudder. I can't tell you which is best but my personal preference is to have the leading edge of the rudder in line with the trailing edge of the prop.

[Rex R]

well... either way means I need to get out the dremmel+cutoff wheel and make some changes... thanks
rex

[Ub Hauled]

Well, since we're at it,
why isn't it a good idea to have the rudder be in a
wing shape (soft lead & soft trailing edge with a chubbier center)?

[Simon.O.]

I agree with Graham on putting it on the opposite side to the tf, I have pages of this stuff printed off in my reference folder and some of it came from here and the rest at rrr. http://www.rumrunnerracing.com/fefor...ead.php?t=8752

In response to what Joe mentioned regarding interference between the rudder and prop I will say that on my shovel the rudder is actually forward of the prop and off to the left. The prop spray can not hit the rudder = good, the rudder is not tuned enough at speed for its wash to have any major effect on the prop stream. If the rudder is that far over at full power it will flip it..................there is no need to elaborate on that one.

Well, since we're at it,
why isn't it a good idea to have the rudder be in a
wing shape (soft lead & soft trailing edge with a chubbier center)?

Oh now you have done it Jan, this discussion could go nuclear with that question
BTW. I run thin flat rudders with a sharpened leading edge.

[J Solinger]

Well, since we're at it,
why isn't it a good idea to have the rudder be in a
wing shape (soft lead & soft trailing edge with a chubbier center)?

It would suck the water onto it and create a bunch of drag.

I run the rudder on the right side of my shovels and riggers. I have found that having the rudder and turn fin closer to being in line creates less drag tension between the two.

[Ub Hauled]

It would suck the water onto it and create a bunch of drag.

I run the rudder on the right side of my shovels and riggers. I have found that having the rudder and turn fin closer to being in line creates less drag tension between the two.

Interesting... living and learning. I would have thought the wing shaped rudder would be a step up snce it is a wedge type rudder with a "slope" where the flat side would have been....
BTW, love your hardware.

Thanks.