J2 Cub Balsa and Monocoque gasser to E pow

Desert.Rat

Junior Member
I have my dad's hand built J2 Cub that has never flown. I have been building scratch built planes with the new brushless / ECS setup and really like the ease of use and dependability. I want to some day take this plane up as a tribute to my fathers skill and talent as a builder. He and I flew wire controlled planes together, with my father building the planes and I breaking in the gas motors. As a child it was very apparent that my father was an artist with designer, but tenable with mechanical things like motors. This is probably why I am now an engineer and My father is an Art Director / Production Designer for several motion picture companies ...ie Disney. My father now has Alzheimer's / FLD (Frontal Lobe Dementia) but recognizes the plane he built when he can't remember where he is.

Now that I set up the picture...pun intended...I am wondering what it would take to put a brushless motor in this plane
The plane has a wing span of 59", made from balsa and monocoque. Gas motor is a 108 size 2-stroke glow engine and exhaust that weights about 1200 g. It has World receivers and servos. All these would need replaced because I don't have a 72 MHz transmitter. I'm sure it's possible, but ai don't want to damage or modify the plane so it can't go back as a gasser some day.

Any direction or concerns? Can you point me to a link or another thread would be wonderful.
 

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Desert.Rat

Junior Member
How do I size the electric motor so I have enough power? There seem to be a wide selection of electric motors
 

RAM

Posted a thousand or more times
How do I size the electric motor so I have enough power? There seem to be a wide selection of electric motors

I'm totally new to this hobby but I'll post this find once again. Long videos but should help you figure it out on your own. You will need a scale and a wattmeter for your motor to do it like this guy does. He talks a lot about how he went about it and also discusses mistakes he made and how he corrected them. You can also get close just using the plane weight and specs from vendors but I like his method better.

http://www.youtube.com/watch?v=lgCxr-F5eyo
http://www.youtube.com/watch?v=ZztK1LnpSVg skip to 1:30 to see his reasoning for motor/prop
http://www.youtube.com/watch?v=O9eirhUubXQ
 
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