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Tunnel Hull Turn Fin??

Old 08-04-2007, 09:42 PM
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Oh Yeah!!
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Default Tunnel Hull Turn Fin??

Hey Guys,

I have an older, K&B 3.5 powered Tunnel Hull and have never installed a turn fin on it. I know you need to install it on the right, inside tunnel, towards the front of the boat, but how do you know exactly where to put it? Also... can I make one or would I be better off purchasing one??

Thanks,
Phil

Here's a pic of the Tunnel that needs a turn fin.
Old 08-04-2007, 11:08 PM
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Ron Olson
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Default RE: Tunnel Hull Turn Fin??

If it turns fine without one then it doesn't need it. The turn fins used to be a quick and easy fix for poor handling tunnel boats in the early years. They were mounted on the inside of the right sponson under the center of gravity.
Old 08-04-2007, 11:37 PM
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Default RE: Tunnel Hull Turn Fin??

Ron is right,

a turn fin on a Tunnel boat was due to a design flaw in the hull.

Dan.
Old 08-05-2007, 07:25 AM
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Default RE: Tunnel Hull Turn Fin??

O.K. It turns fine as long as you turn wide, but as soon as you turn sharper it spins out and/or starts to cavatate and while it is getting settled in to go again, the other guy is around the turn and gone.[&o]
Old 08-05-2007, 09:12 AM
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Default RE: Tunnel Hull Turn Fin??

It's cavitating in the turns because the engine is too high. Spinning out can be caused from having the CG too far forward.
Keep in mind that this boat is kind of stane age compared to today's boats. you should have seen them in the early years of OB tunnel boat racing! If you could finish a heat without them flipping over it was a miracle.
Old 08-05-2007, 05:45 PM
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Default RE: Tunnel Hull Turn Fin??

Looks like a Steve Muck Littl' Light'n... Neat little boat.. Had one at years back. Ran good up to the day my buddy thought it was a duck and ran right into it.

Drop the turn fin and install some stumble blocks.. Or also known as [link=http://www2.towerhobbies.com/cgi-bin/wti0001p?&I=LXMNJ6&P=SM]Recovery Pads[/link].. Use the link to see what Tower has for the TS2..
Old 08-07-2007, 08:51 PM
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Default RE: Tunnel Hull Turn Fin??

When I first got the boat it had a device under the cowl, that when it turned, it would raise the motor up some(trim the motor up) and when you came out of the turn it would trim back down for the sraights. It still would spin out or cavitate if I turned too sharp. So... I took it off. Is it needed??
As far as the Recovery pads... please explain how they work??
I, most likely, need to move the CofG back some too!!

Thanks,
Phil
Old 08-07-2007, 09:03 PM
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Default RE: Tunnel Hull Turn Fin??

Hey ob nut,

How do you get on the Steve Muck website??
Old 08-08-2007, 06:13 PM
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Default RE: Tunnel Hull Turn Fin??

Don't know if Steve Muck has a web site or not. It's been 15 years + that I"ve run that boat. What you have (had) for the motor is old school, have a few of them myself. Never have tried it thought. The recovery pads stop the front from diving in to much, which makes the boat spin out.
Old 08-08-2007, 10:12 PM
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Default RE: Tunnel Hull Turn Fin??

Ahhh... O.K...

Thanks Mark!!
Old 08-08-2007, 11:52 PM
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Default RE: Tunnel Hull Turn Fin??

Steve Muck Boats does kind of have a site but it's not currently up. http://www.stevemuckrcboats.com/
Steve is no longer the owner of the company and I can't remember off-hand who the new owner is.
Old 08-09-2007, 07:17 PM
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Default RE: Tunnel Hull Turn Fin??

So... what do you do after getting to the account page??

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