I am under the impression that the 9hp outboard on my dad's little tinny needs to be raised. I haven't had a chance to have a look at the AV plate while underway yet. It is very sluggish for a small boat, even with only one person.
DSC_0142[1].jpg
I believe the problem is also compounded by being over trimmed, the trim bar however will require some persuasion in order to adjust. You can just tell from the photo how far trimmed in it is.
It is a bit hard to say because the photo is not taken level with the bottom, but it sure looks way low.
I will try and get some better photos, the boat is a few hours away.
Edit: Is there any particular angles that would so it the best?
Ask him to bend down and take pictures from a few angles while his camera is level with the bottom of the boat.
We need to see where the anti-ventilation plate is height wise in relation to the bottom of the boat. The anti-vent plate is where the aftermarket "wings" are bolted to.
Sorta looks like he might have a long shaft motor on a short shaft hull. Ask him to measure the height of the transom, it will be either 15" or 20". Then measure from the flat at the top of the engine mount to the cav plate on the outboard. That should also be about 15" or 20". I'll guess the transom is 15" and the motor is 20".
Dale
I fish because the little voices in my head tell me to
That would seem about right, the clamps for the out board are at the very top of the transom.Originally Posted by aussiebasser
Hi McKnight
Are you sure the foils are on right way round?
They look backwards to me but maybe its the picture.
If they are backwards that would certainly slow you down
Cheers
Chimo
What could go wrong.......................
I think your on to it there bud............looks like a short shaft hull with a long shaft motor..........No problems if it's raised appropriately.
Dan
Confidence.......the feeling you get before you fully understand the situation.
That is the way those foils are designed Chimo. I had a set on my 15. The thing is they should be out of the water when you are on the plane. Those will be about 5" under water on plane, and a 9hp motor will have a lot of trouble pushing them with the prop so deep. The hull will need to have the transom modified, and raised about 5".
Dale
I fish because the little voices in my head tell me to
as mentioned, we need a picture with the camera level with the bottom of the hull, showing the cav plate (the things the foil is bolted to)
That photo does have the camera level with the bottom of the hull.
Dale
I fish because the little voices in my head tell me to
I am fairly certain they are on the right way (up the right way and front to back). The picture is a little deceiving in that they look narrower at the back than the front.
In that case, the motor is way too deep, probably as mentioned a long shaft on a short shaft transom. It will need to be lifted somehow, either some sort of home made plate or building the transom up (5") the foil running under the water would be a mega drag....and possibly dangerous.
I think Chimo has hit the nail on the head,tabs would cause so much drag facing backwards.have had a few ,never like that and never a problem.I would turn them around and try that before I got carried away with anything major.
The foils are not on backwards. They have a sharp edge at the front and a squared off edge at the back. The photo clearly shows that there is a long shaft outboard on a short shaft hull. It will be lucky to plane like that. With the prop so deep, the foils on the motor and the massive amount of negative trim, all that setup is safe for is trolling at fast idle. If it gets up to any speed it will try to bury the nose of the boat in the first decent wave you see. Some of the advice you are getting is scary.
Dale
I fish because the little voices in my head tell me to
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