Boat draft

Z. Fullarton

Z. Fullarton

Recruit
Joined
Mar 8, 2012
Messages
3
Im curious about the draft of my boat when Im cruising. I have a 19ft harbercraft outboard with a 12 degreee deadrise. I know that with my motor trimmed up as far as it can go and still run, I can do about 2 ft when at idle. But how deep can I go at wide open or cruising? Should it be around the same or shallower?
 
C

cyclops2

Banned
Joined
Apr 19, 2011
Messages
1,237
Re: Boat draft

Trimmed up to me means, you can power raise & lower the motor. Or do you mean you TILT the the motor in or out ?

Either way I am completly guessing in general. If your boats " Squats " down at the rear and never climbs out of a very wide, white & frothy wave condition, it will be deeper than when traveling at 1000 rpms in gear.

Trimming the outboard motor to large tilt angles, PREVENTS, climbing out of that wide frothy wave. You really need near vertical to a slightly back / out / angle. That provides the most force pushing the boat foward & increasing speed to get on to a shallow running plane.
 
26aftcab454

26aftcab454

Lieutenant Commander
Joined
May 12, 2009
Messages
1,510
Re: Boat draft

look behind your boat when you run on plane at the hole in the water then add the cavitation plate to skeg.
 
Fireman431

Fireman431

Rear Admiral
Joined
Sep 17, 2007
Messages
4,292
Re: Boat draft

Usually up on plane, with the engine (properly) trimmed, you pull about 40-50% of you "settled in the water" draft.
 
5150abf

5150abf

Vice Admiral
Joined
Aug 12, 2007
Messages
5,808
Re: Boat draft

The problem with running skinny like that is you never know when it is going to be too skinny and now you are whacking your engine at top speed, I am on my 3rd lower from running the skinny water, finally learned and don't do it anymore.

Really skinny water is best crossd with the engine tilted up and going very slow, if the boat won't clear it you shouldn't be there or you need to get a jet drive.
 
R

Rockmere1

Seaman
Joined
Feb 27, 2011
Messages
68
Re: Boat draft

Really skinny water is best crossed with the engine tilted up and going very slow, if the boat won't clear it you shouldn't be there or you need to get a jet drive.
Click to expand...

Agreed, I tore a prop up
 
H

Home Cookin'

Fleet Admiral
Joined
May 26, 2009
Messages
9,715
Re: Boat draft

26aftcab454 said:
look behind your boat when you run on plane at the hole in the water then add the cavitation plate to skeg.
Click to expand...


let someone else drive when you do this

don't use a ruler to measure the depth from the cavitation plate to the skeg while on a plane

Hope this helps
 
oops!

oops!

Supreme Mariner
Joined
Oct 18, 2007
Messages
12,932
Re: Boat draft

Fireman431 said:
Usually up on plane, with the engine (properly) trimmed, you pull about 40-50% of you "settled in the water" draft.
Click to expand...

many many factors to the question.....

but the above is a good rule of thumb
 
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