ORIGINAL: goirish
Hey greybeard I am in the process of building the Dirty birdy and it is a hard build. I am wanting to put a 91 4 stroke in it and the fuselage has to be adapted to fit it. Firewall had to be moved back and the fuselage had to be widen to accept the engine. Guess it was really made for the 60 2 stroke.
Yep, back in the day of the Dirty Birdy, the mass production proliferation of the 4-stroke was note even a dream for most modelers. That was the day of the hard running tuned piped .61 2-stroke. And the pattern planes of that era love to fly fast. I had a club member who tried to fly a Bridi Deception like his IMAC Extra 300. After I talked him into keeping the throttle at full he realized how well the plane actually flew.
Hogflyer