aaganz

I built 2 CL planes (identical) in the 1950s. They are similar to the Super Ringmaster but have a 42 inch wingspan (K&B 35). I am restoring them...wing covering, glue, dope,..etc... but find the motor mounting bolts do not align for the smaller K&B 19 engine I want to use. The mounting logs are fairly saturated with old fuel and oil while sitting for the past 70 years.

I am thinking to glue/bolt new thin "engine logs" over the old logs and bolt on the K&B 19, Is this a reasonable idea, and if so, what are the "logs" made of???....cedar, mahogany,...?? weight and strength would be important.
Thanks,

aaganz

AJ Sun

I here what your saying you don't have a K&B 35..I.would weight the plane and see what it weights. If it's in the 30oz area a 19 will probably fly it in the Circle on 50 foot lines. If it's in the high 30s a strong wind will lift it,but a tail wind would blow the plane into.the circle..the K&B is a heaver motor compared to a Fox. And to be honest I fly Fox motors. I did have a Fox 19, originally on my flying Fool. It weighted around 33oz it flew buy went slack.on the lines several times. Think I was flying 55ft lines 15/7stran I changed the motor took lots of work to aFox Stunt 35. She flew alot better. But lost it when the top wing separated AJ

aaganz

AJ Sun,
Thank you, I will check the weight of the plane. I do expect to fly "leisurely", and in no wind conditions. My K&B 35 is hidden somewhere in the attic, but for "gentle flying" I thought the K&B 19 would be better.

Thinking more on the mounting, I am tempted to use small flat pieces of aluminum with holes drilled out for the old K&B 35 bolts. The flat aluminum would be bolted down over the old bolts, and then new holes drilled for the new bolts for the K&B 19. This should be strong enough, and the bolts would be better than trying to glue to oil saturated "logs".

aaganz

AJ Sun

Aaganz yes that would work using an Aluminum insert. I personally have never tried that but, I have seen other flyers mod an engine mount in the same way. Really inspect your plane the Bell Crank is very important and gets lots pressure in the circle, I just overhauled my Magician my oldest U Control plane. It sports a Fox Stunt 35. It’s oil soaked and the wood was soft in the engine mount area and also the fuel tank. I had changed it to a 2.5 Oz tank from a 4oz tank. And replaced the ply around that area. I recovered the wings and replaced the Bel Crank Mount with a thicker ply. My wires were fine and so was the Bel crank I think it was Veco bell crank. Let us know how it goes! AJ