J3 Cub BY: Russ Watson
. Just finished a Model Tech J-3 Cub this week. It is a 20
size with a 48 inch wing span. I installed an OS .25 FX. Hope it will pull around a 3.5
lb. plane. It uses standard sized Futaba 3004 servos except for the Hitec 225 servo used
for the ailerons. The model built-up very easily with everything fitting nicely. The
airframe and covering quality is very good for an ARF. Hope to run-up the engine tomarrow
and fly by Friday if the wind permits.
Another view of the underside of the cowl.
The OS .25 FX pulls the plane around just fine and it has great endurance with the 6 oz. tank. Several flights were 20 minutes with a quarter tank of fuel left over. Climb-out is fairly steep and the plane will do all the basic aerobatics such as rolls, loops and spins and the snap-roll rate is about three to four times that of a normal roll.
Did the run-up on the engine on Thursday but the winds were 20 - 25 mph so I did not test fly. Friday the winds were 10 - 15 mph so I gave it the first flight. The plane took a little more steering down the runway than I was used to but once airborn it flew very well. The speed is much faster than scale. It flys more like an Avistar Trainer than a Cub.
|Russ Watson Jan 2006|