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Discussion
Choosing motors for a twin
Is there a general rule of thumb when choosing motors for a twin?
I've kinda gotten the hang of choosing a motor for a single. What baffles me is how to factor-in the second motor. The only factor that comes to mind is a twin has a second prop wash over the wing. I'm certain there are other factors, but have no idea what they are and what to do about them. Hoping for some guidance! |
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Unless you like to fly in circles, I would recommend two fairly close matching motors systems, unless you are talkig about an inline pair, (push-me-pull-you_).
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That's funny!
My goal is to properly size twin motors for a given airframe. Example: (I'm making this up) - Piper Comanche vs Twin Comanche - 65" wing - 750 in2 wing area - 9 lbs auw - 28 oz/ft2 wing loading - single motor is a Power 60 Is there a rule of thumb to go from that single motor to a twin setup on the same airframe? |
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I've always thought that it made sense to split the power as well. Especially with electric motors where it's still the total watts per lb provided. One factor I think is important would be the Kv values of the motors. I feel that having a similar total prop disc area for moving the air is going to be needed to keep the climb for the power used similar. So we can't replace a big slow turning prop that has a good bite with a couple of small high RPM toothpicks. That's certainly going to affect the climb rate if things are way out of whack.
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