Help w/Sizing motor/prop for OV-10 Bronco
08-27-2013, 07:20 AM
#1
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Help w/Sizing motor/prop for OV-10 Bronco
Hi all,
I just pulled the trigger on this OV-10, http://www.hobbyhangar.com/hhbaseline_002.htm
I'm going electric on this. I can calculate motor/prop on a plank w/one motor. But how do you do it if the plank has 2 motors/props? Do you just figure two motors that would be about half as powerful if the plank had one motor instead? I don't want to assume the motor in the picture is the best choice for the plane. This is my first twin.
Also, do you recommend counter rotation on one of the motors?
I just pulled the trigger on this OV-10, http://www.hobbyhangar.com/hhbaseline_002.htm
I'm going electric on this. I can calculate motor/prop on a plank w/one motor. But how do you do it if the plank has 2 motors/props? Do you just figure two motors that would be about half as powerful if the plank had one motor instead? I don't want to assume the motor in the picture is the best choice for the plane. This is my first twin.
Also, do you recommend counter rotation on one of the motors?
08-28-2013, 05:56 AM
#2
Not sure if it will help you with electric, but I have one of these OV-10 kit built with two OS 25 FSR's, have many flights on it, it's fast and flies good. I once had one engine go out in the air, and it did not want to fly on one engine, I cut it and landed ok, so there would be soem advantage there by going electric. The plane does have a fairly high wing loading and you have to keep up speed on landing. As far as electrics go, they do have a recommendation on their webpage. The 25's I run are strong and work fine, so that may give you some idea, maybe power 25's or equivalent. Both my engines rotate normally, I don't have any problem with torque, I'm running 9x6 props at about 15k rpm.
