stash4466

Hi guys! How do i determine Engine size to airplanes wingspan? thanks stash4466

hugger-4641

My Feedback: (6)

There are more factors involved than just square inches of wing surface, such as the type of flying you want to do, wing loading, weight of the model, chord  depth, etc. For instance, if you want to do 3D flying with a 7lb Yak, it will need a much larger engine than sport flying with a 7lb Piper Cub. Here is a thread with various resources that might help.

Stew99

Go to the Tower Hobbies website and click on the "airplanes" link. They have them categorized by engine displacement. You can get an idea of what size engine goes with what size plane but it will be different for sport, scale, 3D, etc.

sensei

As always, it is a power to weight ratio thing, depending on what you are planning to do...

Bob

Dreddi

My Feedback: (3)

Yes, total flying WEIGHT is the primary determining factor to engine displacement (or more accurately power output).

example; I have a glider with a 6' wing span and its powered by a COX .049. I have a trainer with 5' wing span thats powered by a .46 would never get off the ground with a .049.