RE: Douglas DC-7
Hi Paul; The weight of the DC7 was 42 lbs and used OS 91 4 stroke which was ok on power will use same on DC4. I am presently designing and building retracts for the DC4. I designed and made a set of electric retracts for the plane but with batteries etc they weighed over 10 lbs so started over and designed an air retract system have them designed and partially built wwill be much lighter and stronger. On the DC7 I installed the inboard tanks in the cowl itself which worked ok Wing is designed but not started. You may be on the right track with servo overload I had futaba 9303 mg in the DC7 around 110 torque will go with the largest I can easily get when ready thanks for the suggestion can't hurt. what is shown in this picture weighs 8 1/2 lbs. I best shut up for now John