Replacement for 1GM

[Tranona]

Biggest problem is the propellor as the standard 2 blade prop for the 1GM needs to be a fairly small diameter and thus it is difficult to ge tthe power into the water.

That depends on the reduction ratio you choose. You can get 3.1:1 and it is possible to swing a 15" 3 blade with that - if you have the room.

 

[Talbot]

That depends on the reduction ratio you choose. You can get 3.1:1 and it is possible to swing a 15" 3 blade with that - if you have the room.

My response about the engine and proellor size was predicated on helping the OP - where the implied assistance is for the fit of a 1GM replacemen to a Catalac. The only way on a Catalac 8 or 9m to swing a 15 inch prop is to chop a hole in the bottom of the boat!