Hello, from south FL. if any one is planning on building the OV10 from Hobbie Hangar and you are going to use OS 25's, use cation on the engine instalation, you can not follow the instructions and the designer does not say anything about the muffler on the OS engines hitting the top of the wing,YOU MUST ROTATE THE ENGINES 45 deg.

I went to the designers office to pick up the plane and told him what engines I was going to use, he didnot say anything about the mufflers hitting the wing, so after a 30 min. telephone call raising H@#!, he did make it good.

The little airplane does fly very nice, USE cation building.