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Old 26 August 2014, 14:58   #11
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I have just checked the prop with the engine in gear, no movement at all. I should say it is a brand new engine having done only 6 hours. I take it that by just putting the engine in gear whilst on the engine stand is what you are referring to.

I did look at the prop whilst the high revs kicked in and also while running normally but to be honest I am not sure what was going on down below as the river is not wide so you need to keep a close eye on hitting the side. I could at times just about see the cavitation plate and I do mean just. The boat still moves when the engine revs up but it is something I need to check further.
Any suggestion put forward, I will try to carry out when next on the water, perhaps during this week.

I did take a photo on the phone of the prop position while on the wheels which I will try to post shortly.

Phil
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Old 26 August 2014, 16:28   #12
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Try raising the engine a couple of CM on the transom with a block of wood. This made a big difference on my boat.

Also my SIB did not want to get on the plane on a river, but performed fine on a lake. Not sure why this would be.
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Old 26 August 2014, 17:22   #13
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Here is the photo of the transom and engine position.




I am grateful for all your views.

Phil
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Old 26 August 2014, 18:14   #14
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Hi phill
Do you run your engine trimmed up at all, or at 90.Your engine may not like being ran trimmed up.Engine is a bit to deep

PS what size and pitch is your prop.
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Old 26 August 2014, 18:48   #15
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I was running at 90 degrees Dave but have tried in all the preset positions on my last session on the water.
I have just looked at the prop which is printed 3-91/4'' x 11''. Not sure what the three is unless it means 3 blade but that is pretty obvious.

Do you think 3'' from cavitation plate to transom is too deep, if so, what distance do you think it should be as a test.

Phil
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Old 27 August 2014, 05:22   #16
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I was running at 90 degrees Dave but have tried in all the preset positions on my last session on the water.
I have just looked at the prop which is printed 3-91/4'' x 11''. Not sure what the three is unless it means 3 blade but that is pretty obvious.

Do you think 3'' from cavitation plate to transom is too deep, if so, what distance do you think it should be as a test.

Phil
Hi

Whilst sorting things out keep at 90.Raise the engine with block of wood making sure it is secure and you are happy it won't fall off, also correct air presure on tubes and floor.

The only way to check for a spun hub is to take prop off mark across prop bush and through hub body on back of prop then take it for a quick run under load, the line will not match if prop is spun.
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Old 27 August 2014, 08:05   #17
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Ah, okay Dave, I'm with you now, never had to do this before so a little uncertain how it was to be carried out.

I will test all the things out that have been suggested with luck sometime this week.

Thank you guys

Phil
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Old 27 August 2014, 08:35   #18
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Ah, okay Dave, I'm with you now, never had to do this before so a little uncertain how it was to be carried out.

I will test all the things out that have been suggested with luck sometime this week.

Thank you guys

Phil
Good Luck
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Old 27 August 2014, 11:35   #19
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I have just looked at the prop which is printed 3-91/4'' x 11''. Not sure what the three is unless it means 3 blade but that is pretty obvious.
Yes, 3 blade, 9.25" diameter, 11" pitch.

From your pics, I'd say the motor is too deep (Loco would disagree.) But, as a first step in figuring it out, you need to get the tubes and keel (and floor if applicable) up to the correct pressures, otherwise you're troubleshooting a setup that will be all over the place anyway.

Once there, see how the boat performs as is, then start making small changes and see what improves the situation and what makes it worse.

Pics didn't show: Is your motor bolted on or clamped? If clamped, it's easy to adjust (at least upwards, which I suspect is what you'll need); if bolted, it's a little more work but still do-able.

jky
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Old 27 August 2014, 11:38   #20
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100% to low in the water. Needs raising for sure
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