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Old 03 August 2020, 15:07   #1
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"She" got wet!!

Hi all, she being "Red" as my wife has christened her. I know not original or insperational but succinct and to the point!
Good maiden voyage on Ullswater, more of which I will discribe (with pics) at a later date.
I now need your advice and help re: OB mounting height.
I tried the outboard at the height of the transom then increased the height until the OB clamps was still just fully on the transom. I know what felt and sounded the best, but is there something I should be looking for?
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Old 03 August 2020, 15:52   #2
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You are looking for the least splash/spray and the highest position but not too high to cause the prop to ventilate/slip in a tighter turn.
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Old 03 August 2020, 15:55   #3
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When you say ventilate, is that a bubbling noise from the prop as tho it's not gripping water?
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Old 03 August 2020, 16:01   #4
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Yes and usually it revving for a few seconds as it loses grip.
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Old 03 August 2020, 16:05   #5
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Quote:
Originally Posted by Steve509926 View Post
Hi all, she being "Red" as my wife has christened her. I know not original or insperational but succinct and to the point!

Good maiden voyage on Ullswater, more of which I will discribe (with pics) at a later date.

I now need your advice and help re: OB mounting height.

I tried the outboard at the height of the transom then increased the height until the OB clamps was still just fully on the transom. I know what felt and sounded the best, but is there something I should be looking for?


There really isnít a right or wrong answer. Itís whatever feels right & suits the boat/load/conditions. Itís a bit of a dark art & involves a lot of trial & error. Youíre aiming to reduce splash back from the leg whilst not losing grip. You also need to adjust the trim pin. Ideally you want the engine leg at 90deg to the water surface with the boat planing.
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Old 03 August 2020, 16:20   #6
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Thanks both, that helps a lot. Think I will need to raise/pack the OB about 20mm above the transom which will still mean the clamps are fully on the transom with 5 mm to spare, and have the trim pin 2 holes up. I'll give that a try tomorrow, one and two up and see how that goes.
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Old 04 August 2020, 03:09   #7
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steve i set my excel up with cav plate at 10 mm below the keel which is packed at 40 mm i suffered cavitation in the chop so i will be lowering mine down to the transom which is 50 mm below the keel, the reason is i noticed the tube cones are hardly in the water on the plane thus keeping the transom higher the reason it cavitates, which is totally different to my mercury 365 each boat make has different characteristics and needs playing with to some extent.
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Old 04 August 2020, 12:21   #8
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Thanks both, that helps a lot. Think I will need to raise/pack the OB about 20mm above the transom which will still mean the clamps are fully on the transom with 5 mm to spare, and have the trim pin 2 holes up. I'll give that a try tomorrow, one and two up and see how that goes.
With 5 mm to spare make sure to bolt it down. Even for a test. I had a 30 hp roll in my first boat. It was setup by the dealer without bolt holes. The motor was raised almost to where the clamping feet reached the top of the transom. And in chop the motor rolled into the boat while running. Thank god it didn't also twist around. I always bolt since that event.
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Old 04 August 2020, 14:56   #9
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Cut a wood block or two of different heights to fit under the outboard. It won't rotate as easily that way. Also good to put a leash on the outboard if it is not bolted.
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