RE: IMP A5M Claude-Which engine
I built a flew one a few years back. I used a Saito 180 with a APC 17x8 prop on 10% getting about 8K at 17.5 pounds dry. It flew very well but not really over powered. I believe a G-26 will give about the same power. Weight in the nose is a very good thing for this plane. I also found some formers where off a bit and the turtle deck needed some extra work. I used some Robart gear struts which worked fairly well.