plowing 12.5 ft

[imported_omcman]

why does my 12.5 harbercraft plow and lose steerage at 3/4 throttle and above with a15hp johnson the boat is rated for a 15 hp i have trimmed full range raised and lowered the mount of the motor to no avail

 

[kenmyfam]

Re: plowing 12.5 ft

Are you over propped ? how are the RPM's at WOT ? what load do you have aboard and how is the weight distributed ? is the prop cavitating ?
The more info you can give the better the experts here can help you.

 

[rickdb1boat]

Re: plowing 12.5 ft

Where is the motors cavitation plate in relation to the bottom of the hull? Should be even or slightly above the bottom. You may be running a long shaft motor on a hull designed for a short shaft ........

 

[Scaaty]

Re: plowing 12.5 ft

This needs to be moved to Boat Topics...get a better response

 

[kenmyfam]

Re: plowing 12.5 ft

This needs to be moved to Boat Topics...get a better response

Good point, it should be moved.

 

[tashasdaddy]

Re: plowing 12.5 ft

a couple of pictures would help,also.

 

[steelespike]

Re: plowing 12.5 ft

From your discription I would say you have a hook in the bottom of the boat.put a 3 or 4 foot straight edge along the bottom of the boat near the transom.You are looking for a concave section.Hopefully it is not concave but straight.Let us know what you find.