We have a vetus shaft and PRM gearbox, The prop shaft goes through the existing coupling up to the face of the gearbox plate - thus if the propshaft can not go through the R&D coupling it would in effect extend our prop shaft by its (R&D coupling) thickness, though I do not know if this would be an issue (any comments anyone?).
Like Martin I would like to know how (assuming the shaft was extended by about an inch - the thickness of the R&D coupling), what effect pushing the prop back by an inch would have? I can't see myself chopping an inch off the prop shaft with an angle grinder in the engine hole. Can you imagine the mess?
For those who've fitted an R&D coupling on their boats, how did pushing back the prop affect the performance?
I'll have to look at my existing (non-flexible) prop shaft coupling. Perhaps the prop shaft can go further into it?
Edited by blackrose, 01 August 2011 - 09:04 PM.
“It is an illusion that youth is happy, an illusion of those who have lost it; but the young know they are wretched for they are full of the truthless ideal which have been instilled into them, and each time they come in contact with the real, they are bruised and wounded. It looks as if they were victims of a conspiracy; for the books they read, ideal by the necessity of selection, and the conversation of their elders, who look back upon the past through a rosy haze of forgetfulness, prepare them for an unreal life. They must discover for themselves that all they have read and all they have been told are lies, lies, lies; and each discovery is another nail driven into the body on the cross of life.” - W. Somerset Maugham, Of Human Bondage