I just replaced a saito 1.00 in my 1/4 scale busa cub with the evo 26 gt. A similar sized plane as the rascal, i mounted it inverted, the ignition module is just behind the firewall.I planned on using the bisson wrap around pitts muffler but there wasn't enough room between the cylinder & the firewall, i welded my own wrap around muffler. In my installation the distance between the firewall & prop drive washer was 6 1/2 '' if you had 7 1/2'' the bisson would probably work. The engine runs great, starts very easily. The throttle hooks up very easy but the choke is a little tricky to connect to.I did have to add quite a bit more right & down thrust compared to the glow engine, balance was no problem just moved elevator & rudder servo's to the tail.I would definately reccomend this engine, it should be a very good match with the rascal, alot less cowl cutting than the zenoah g26.Sorry no pictures at this time, maybe in a few days.