I have built the Bel Air 40 and it has been flying for about 4 years. I have a Saito 56 on it. I wish I had a little more grunt. I also used two aileron servos both inside the fuselage. I found a carbon fiber landing gear for it. However, the gear was straight and it moved the wheels rearward from the plan. That makes the plane very susceptible to tipping forward on a rough grass field. So what ever gear you use make sure the wheels end up far enough forward. When I get around to it I will place an angle shim under my gear.

I have a Bel Air 40 and a Bel Air 60 waiting for another rainy day build.

When I build my next Bel Air 40 I will shorten the nose by an inch and install a YS 63.

The airplane is a great flyer and I still get good comments on it. Have fun with yours.