hi everybody and also hashim
I read your messages. Impluse is a really hot f3a machine. it snaps like that you have never seen before. It has really low speed performance. I used o.s 160 fx and hatori swanneck manifold and hatori pipe for 160. 4 Metal gear digital servos (5625 hitec). Each weight is 2 oz. I used aliminium spinner ( 5.2 oz) and 16 x 14 apc prop. 1700 m-ah 4 cell battery. 600 cc fuel tank. My plane is under 5 kg. Impulse diving vertical down speed is slow and knifeedge is perfect at low rudder rates.
This plane is produced by BNMODELS and excellent quality. thanks BNMODELS