Wow.....I built one for some friends and we have put about 30 flights on it. We haven't had any of those problems. We just added an exhaust extension.

The only problem we had was the engine mount blind nuts that came with the kit stripped. I replaced them with 10-32 screws and blind nuts and all is well.

It is a great flier. With the Saito 180 it is able to climb knife edge as well as hover. Landing it is a piece of cake.