Not mine ,but in Ga.

[Destroyer]

Originally Posted by smokeonthewater

almost no twin engine boat will plane on one engine without a prop change

If proped for twins, I totally agree. Just as no twin setup will deliver x2 the amount of HP that a single will. (Two 70 hp engines will not give the equivalent speed of a 140 hp single). But it still doesn't answer the question.... What hp does a V20 require in order to break free and get up on plane? Let's presume he has one engine go out, so he raises that one, and changes the prop on the other one, and it's a dead calm day on the water. Will the one 70 be enough to get him on plane? I seem to recall somewhere that someone in here had a 90 hp engine and they claimed they could get up on plane, and I know from personal experience that a 65 hp engine just will not do it. So what's the minimum hp necessary?

[smokeonthewater]

i think 90 is the generally accepted min..... my 1975 115 T.O.P. has no problem planing the boat.... supposedly it's the equivalent of a modern 90 though I'm not completely convinced that Karl didn't put a little something extra in the old mercs

[smokeonthewater]

Originally Posted by Destroyer

Two 70 hp engines will not give the equivalent speed of a 140 hp single.

Just for the sake of conversation, one possible exception to that might be an exceptionally heavy slow boat where the extra surface area of the second prop MAY reduce slip% enough to increase speed or even plane where otherwise it wouldn't...

[spareparts]

Originally Posted by smokeonthewater

Just for the sake of conversation, one possible exception to that might be an exceptionally heavy slow boat where the extra surface area of the second prop MAY reduce slip% enough to increase speed or even plane where otherwise it wouldn't...

I've sen where twins gave more speed than a single of the same combined hp due to the fact the twins were able to provide more lift to the hull, its rare, but I've seen it

[bgreene]

How about triple 40 hp outboards on a V ?

[smokeonthewater]

Originally Posted by bgreene

How about triple 140 hp outboards on a V ?

fixed it for ya

[spareparts]

Originally Posted by smokeonthewater

fixed it for ya

thats better!