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  keel and cavitation plate ?

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Author Topic:   keel and cavitation plate ?
paco355 posted 06-08-2003 08:59 PM ET (US)   Profile for paco355   Send Email to paco355  
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 ?
Dick posted 06-08-2003 09:05 PM ET (US)     Profile for Dick  Send Email to Dick     
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.


paco355 posted 06-08-2003 09:34 PM ET (US)     Profile for paco355  Send Email to paco355     
the 9.9 i have bolts and clamps on .
Sal DiMercurio posted 06-08-2003 10:14 PM ET (US)     Profile for Sal DiMercurio  Send Email to Sal DiMercurio     
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.
whalersman posted 06-08-2003 10:30 PM ET (US)     Profile for whalersman  Send Email to whalersman     
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???

JBCornwell posted 06-08-2003 11:54 PM ET (US)     Profile for JBCornwell  Send Email to JBCornwell     
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. . .

whalersman posted 06-09-2003 02:19 AM ET (US)     Profile for whalersman  Send Email to whalersman     

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...
It pulled me out of the water on a single ski with 1 person driving (not legal in CA.) and once I was up (not easy) away I went...

I guess if a small 15 year old kid was driving with absolutely nothing on board, and only 3 gallons of gas....


Clark Roberts posted 06-09-2003 06:10 AM ET (US)     Profile for Clark Roberts  Send Email to Clark Roberts     
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
whalersman posted 06-09-2003 04:07 PM ET (US)     Profile for whalersman  Send Email to whalersman     

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.

Aldog posted 06-09-2003 10:15 PM ET (US)     Profile for Aldog  Send Email to Aldog     
Wait. What is the correct set up for cavitation plate to keel?
where2 posted 06-10-2003 01:12 PM ET (US)     Profile for where2  Send Email to where2     
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...

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