new boater

D

Dorkynhymer

Recruit
Joined
Mar 16, 2013
Messages
5
i have a 1969 -16' Alpex by Alumacraft fiberglass tri-hull with a 1969 Johnson 33hp . after reading in the iboat forum i discovered that boat and motor are mis-matched maybe . i have a 20" transom and the cavitation plate on the motor is 3" below the bottom of the boat . i measured from the cavitation plate to the mount bracket as 23" . i thought the shaft sizes were 15-20-25. i do notice at full throttle the boat doesnt fully plane the bow rides high and plows the water .does this make sense and what should i do. this is my first thread and would appreciate any input thanks
 
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82rude

Rear Admiral
Joined
May 8, 2012
Messages
4,082
Re: new boater

pics would be nice.i might be wrong but i dont think there was a extra long for that motor in 69.you have physically measured the transom itself?
 
NYBo

NYBo

Admiral
Joined
Oct 23, 2008
Messages
7,107
Re: new boater

Welcome to iboats!:welcome:

I think you have properly diagnosed the problem: The motor's shaft is too long. A simple jack plate would solve the problem, or you could possibly increase the height of the transom. Post some pictures of the motor and transom.
 
D

Dorkynhymer

Recruit
Joined
Mar 16, 2013
Messages
5
Re: new boater

82rude said:
pics would be nice.i might be wrong but i dont think there was a extra long for that motor in 69.you have physically measured the transom itself?
Click to expand...

i did measure the transom itself..i will take photos tomorrow and post them for you all to see..so my next question is how to post pics? thanks
 
D

Dorkynhymer

Recruit
Joined
Mar 16, 2013
Messages
5
Re: new boater

NYBo said:
Welcome to iboats!:welcome:

I think you have properly diagnosed the problem: The motor's shaft is too long. A simple jack plate would solve the problem, or you could possibly increase the height of the transom. Post some pictures of the motor and transom.
Click to expand...

i dont know how to post pics yet ...i will take some tomorrow and try to figure out how thanks
 
smokeonthewater

smokeonthewater

Fleet Admiral
Joined
Dec 3, 2009
Messages
9,838
Re: new boater

I suspect that while you have found a potential issue, 33 hp sounds WAY small for a 16' fiberglass boat and I'd bet THAT is a far bigger cause of your inability to plane than the engine being only 3" low....... generally that doesn't stop the boat from planing but rather causes the bow to tend to plow and ride low in the water..... I'd venture a WAG that you ought to have 50 hp plus on that rig.
 
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