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The Original Fast Electric Q&A This is the #1 spot in the world to ask questions about Fast Electric R/C Boats.

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  #1  
Old 02-18-2003, 10:14 PM
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MR truckpull MR truckpull is offline
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Lsh ????

I have a few setup questions for LSH.
Should the rudder be on the inside or outside of the prop?
Center distance between prop and rudder?
How deep below the prop should the rudder be?
Were should the CG be?
How big, how deep, what angle should the turn fin be?

Pictures would be great.

Thank You LARRY

Last edited by MR truckpull; 02-18-2003 at 10:20 PM.
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Old 02-19-2003, 02:09 AM
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Dan Chase Dan Chase is offline
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There are no cookie cutter answers for your question, it will very from hull design to hull design, even the same model of boat can vary a little from hull to hull.

A few rules of thumb that I go by are:

1. Rudder behind the prop, right side of transom.

2. I'm not sure what your asking.

3. The rudder should not be any deeper then it needs to turn the boat, anything else is just drag. Riggers usually need shorter rudders then Offshore, LSH shouldn't need a very deep rudder, but I would not go less then a 1/4" below the prop when it's in the vertical position.

4. CG can vary with conditions, as a rule of thumb, I start with the CoG at the center of the turn fin.

5. Same rule applies to the rudder, just big/deep enough so it turns properly. As far as angle, if your lifting your inside sponson, you need more angle. If you think of the bottom of the turn fin as the hand of a clock, you should probably start around the 1:00 position.

What hull are you running?
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Old 02-19-2003, 02:27 AM
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MR truckpull MR truckpull is offline
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Thank you for the information Dan.

I am going to run the Hydro+ Marine Bud Viper Turbine 1

What I ment by center ditance is, How far to the Right should the rudder be from the prop?

LARRY
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Old 02-19-2003, 08:07 AM
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As far as you can get it.

I try to put it about 1/4" or so toward the prop from the edge of the tunnel.

Andy
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Old 02-19-2003, 09:12 AM
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Hello Larry,

Here's a pic for you, H&M Viper. Rudder is 1 1/2 inches from the drive shaft.

http://www.skullcaps.com/boats/setup2.jpg

Paul.
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Old 02-19-2003, 11:08 AM
Jvb
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I built mine with the rudder on the left hand side . . . same as the guy in this article (http://www.rc-raceboats.de/hydra01.htm). If I'm not running ovals does it make much of a difference or should I be putting the rudder on the right hand side of the boat anyways?

Jorgen
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  #7  
Old 02-19-2003, 01:41 PM
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MR truckpull MR truckpull is offline
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Paul -- Is that drive shaft adjustable?

LARRY
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Old 02-19-2003, 02:42 PM
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Dan Chase Dan Chase is offline
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Larry, I'm with Andy, for an oval boat I like them as far as I can get them away from the strut. On my H&M Bud, my rudder is mounted on the right side 2 1/2" from the strut.
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Old 02-19-2003, 02:58 PM
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Doug Forrester Doug Forrester is offline
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Sport hydro rudder placement

I, also agree with the "far away" treatment. However, I am a strong proponent of the "left side" camp. I have always done it this way and it has always worked well for me.
Personally I think it works either way and that it is more a personal preference issue. One big reason why I prefer the left side is that I like to have the rudder servo pushrod "pull" for a right turn and this seems to be easier to achieve with the rudder to the left of the strut on the transom.
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Old 02-19-2003, 03:54 PM
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I always thought putting the rudder on the right side throws rudder wash in to the prop area.
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Old 02-19-2003, 03:57 PM
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Only if you are running a Classic Thunder boat.

Andy
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Old 02-19-2003, 04:02 PM
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No, I mean the rudder goes on the left side looking at the rear.

Hey, Andy, I e-mailed you at my same address I have had and it bounced back. Write me...you know the address here.
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Old 02-19-2003, 04:21 PM
Paul Paul is offline
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Hello Guys,

It's funny, I've tried several different positions on sport hydros and they all worked OK, but, the last one I built I put the rudder closer to the drive shaft and the boat handled like it was on rails. Running the rudder on the left side as far out on the transom as possable resulted in a boat the seemed to "slide" a bit in the corners. Could have been the boat but this setup works for me so I stick with it. To me it makes more sence to have the rudder on the same side as the pivot (turn fin) rather than have it on the other side.

Larry, the shaft is adjustable to a point. What I do is start with a shaft that's a bit long, run the boat and adjust the length until it's just right then take off an extra 1/8" on the stuffing tube. Then I can adjust the ride attitude of the boat by extending or retracting the shaft by 1/4". Doesn't sound like much but it works well for me.

Paul.
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