Moderated Discussion Areas
ContinuousWave: Whaler Performance
keel and cavitation plate ?
|Author||Topic: keel and cavitation plate ?|
posted 06-08-2003 08:59 PM ET (US)
ok i was reading about where your cavitation plate should be in relation to your keel . now i have a guestion does this apply to small motors on small boats too ? i think i am getting all i can get out of my 9.9 on the 13 footer but i went out and checked the position of both and found that the cavitation plate is a half inch or so lower . would making it even or alittle higher make a difference ?
posted 06-08-2003 09:05 PM ET (US)
You will normaly get better performance with the cavitation plate above the keel.
Running a 9.9 I would guess that you are only using the clamp screws to hold the motor on. Be carefull raising the motor and make sure you don't raise the clamp screws above the transom. If you are bolted on it should be no problem.
posted 06-08-2003 09:34 PM ET (US)
the 9.9 i have bolts and clamps on .
posted 06-08-2003 10:14 PM ET (US)
Raise it up at least 1" "above" the bottom of the boat.
Put a straight edge like a 2x4 under the boat, flush up against the bottom & the very top edge of the 2x4 should be "below" the antivent [ cavitation ] plate.
posted 06-08-2003 10:30 PM ET (US)
Am I missing something here??
The 13' is rated for a 40 HP engine...
Would a 9.9 get it up on plane?? I don't think so. If it does not get up on plane, then it shouldn't make any difference whatsoever what height the engine is mounted??
Also, I don't believe the 9.9 has slots to raise the engine. Wouldn't you have to drill new holes???
posted 06-08-2003 11:54 PM ET (US)
That plate is correctly called the anti-ventilation plate.
Yes, a well-rigged 9.9 will plane a well balanced and lightly loaded 13.
Don't raise it too high or you will experience the ventilation the plate is intended to prevent.
Red sky at night. . .
posted 06-09-2003 02:19 AM ET (US)
I would sure like to see that light load...
I guess that leaves out any adult that weighs more then a jockey........??????
Not much you can throw overboard on a 13'....
I owned one for 10 years with a 35 HP on it...
I guess if a small 15 year old kid was driving with absolutely nothing on board, and only 3 gallons of gas....
posted 06-09-2003 06:10 AM ET (US)
JB is absolutely correct! I had a 1966 13 years ago with a 9.8hp Merc and it got on plane easily with two adults (me at about 180lbs and another adult forward). Whalers own literature lists 9hp as min hp to plane and operate satisfactorily. There used to be several 13's around with the old low profile 9.5 OMC's that popped along nicely also. Happy Whalin'... Clark... Spruce Creek Navy
posted 06-09-2003 04:07 PM ET (US)
I know the book says 9 HP minimum to plane, I never would have imagined it would plane with 2 adults on board though... let alone any gear or a cooler..
I also owned a 1966 for 10 + years ...
Can't argue with your first hand experience either.
posted 06-09-2003 10:15 PM ET (US)
Wait. What is the correct set up for cavitation plate to keel?
posted 06-10-2003 01:12 PM ET (US)
Someone bring their 13' to my house. I'll pull out the old 9.5 Evinrude Sportwin and we'll see if it will plane...
Purchase our Licensed Version- which adds many more features!
© Infopop Corporation (formerly Madrona Park, Inc.), 1998 - 2000.