I built my first Flite Streak in 1958 and it had a Fox 35.

By the late 60's I using the OS Max S35.

Seemed to me that Monokote weighed less than silkspan and dope and held up much better?

Seems like 26 oz complete dry was my goal? I used a 2 1/4 oz Perfect tank

Tried one with flaps. The distance of the flaps from the aerodynamic center was wrong and it ruined the maneuverability of the plane.

I had two K&B Torpedo 19's. My 1st one was so old (1952) it had a silver head. The second one was a green head though.