Posted by Steve Roffey on November 14, 2002 at 20:06:26:
In Reply to: Re: 3 pt Hydroplane, when to use fins on the bottom? posted by Skeet on November 14, 2002 at 12:22:47:
Hi skeet
Don said below in another post that a fin is critical at racing speeds, but since i am starting with a 6HP, then a 10 HP, i shouldnt hit much more than 30 MPH. I expect that is why these kits dont come with fins although i will definately consider using them.
When you say the motor is high on the transom, how high should it really be? I understand that the Anti Ventilation plate, (or cavitation plate as some may call it) would run out of the water anyway, so How much below the tunnel should it be?
Thanks,
Steve
: Hi Steve....If you are going to play around with a 3pt hydro you should have a turn fin for each sponson transome to turn both directions. A rear fin is not needed. Also weight placement front to rear will help greatly with the turning ability. On the other hand when you are ready to race only one turn fin is needed on the left side sponson transome also when racing the engine is positioned quite high on the transome with a streamlined lower unit (Quickie). Props are also very important with performance, 2blade props have different characteristics than 3blade. Most of all hydros are a very fast style of boat and a ton of fun.