Prop Shaft Angle for Cavalier 28
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Martin Jacobs
Dec 24, 2021, 10:37:40 PM12/24/21
to Cavalier 28
Would anyone know the angle to the horizontal for the prop shaft for a Cavalier 28? Is it 8 degrees, 10 degrees, 12 degrees, 15 degrees, something else?
The reason I ask is that I will have to do some surgery to my engine beds. The engine beds should lie at the same angle to the horizontal as the prop shaft, to avoid unevenly stressing the mountings and bearings.
Why don't I just measure what is already there, or align the new beds with the old? I hear you ask. Because, at some time in its history, the builders or owners decided it was a good idea to put a step in the beds so that the aft mounts are on a step, about 70mm higher than the forward mounts (the rear bracket on the engine can be mounted up or down to let you do this). Not only is there a step between the front and rear brackets, but the steps do not lie at the same angle to the horizontal. There is, maybe, a 5 degree difference. So, I don't know if the front steps are right, or if the back steps are right, or if they are all wrong. If I knew the angle of the prop shaft, I could work something out.
There is not much of the prop shaft inside the boat from which to get an angle or an alignment. I'll measure it as precisely as possible, but it might not be very accurate.
The reason I ask is that I will have to do some surgery to my engine beds. The engine beds should lie at the same angle to the horizontal as the prop shaft, to avoid unevenly stressing the mountings and bearings.
Why don't I just measure what is already there, or align the new beds with the old? I hear you ask. Because, at some time in its history, the builders or owners decided it was a good idea to put a step in the beds so that the aft mounts are on a step, about 70mm higher than the forward mounts (the rear bracket on the engine can be mounted up or down to let you do this). Not only is there a step between the front and rear brackets, but the steps do not lie at the same angle to the horizontal. There is, maybe, a 5 degree difference. So, I don't know if the front steps are right, or if the back steps are right, or if they are all wrong. If I knew the angle of the prop shaft, I could work something out.
There is not much of the prop shaft inside the boat from which to get an angle or an alignment. I'll measure it as precisely as possible, but it might not be very accurate.
At present the boat is not on the slips, it is in the water (else I could get a measurement). And, I've bought a polyflex coupling for the flange. I don't intend to rely on the polyflex to get things aligned, but it will increase the tolerances somewhat from the previous arrangement, which had the engine flange hard-bolted onto the prop shaft flange.
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