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Electric Warbird: Help with ESC Selection
Ok, I need some recommendations for what is a good brand for an ESC. The application is a 1/5 Spitfire weighing in at around 18-20 lbs, 83" ws, and I will be swinging a 24-12 4 blade prop. As near as I can tell, the prop data indicates it requires about 2HP to swing this prop at 6000rpm. The motor I have in mind is a Turnigy CA80-80 with 12S 5000mah, 40C, Li Po batteries (2 6s in series). I would like to be able to program the ESC to set the LVC, soft start, etc. I don't have to have a BEC although it would be convenient. Any suggestions would be helpful regarding selection criteria, brand, current rating, etc. Thanx, Mark |
I am also considering a Suppo 7035-8 (80-90) elec motor for my application described above, and I am wondering who has any experience (watt, amp, and voltage readings) with this motor and using a 4 blade propeller. More specifically, I am wondering if this motor can turn a 24-12” 4 blade prop at about 6000 rpm or higher. Thanx, Mark |
It looks like a 120 - 200A HV ESC might be needed.
(Depends on prop size, the make/model of the ESC, etc.) I'd suggest that you consider using an external BEC. |
Chuckk2, yeah it looks like that 's what eCalc (from Castle Creations) is telling me. I'm getting current readings around 150- 160 A using a 160kV motor and 10S 6000maH 35C batteries. This is turning a 22 or 24", 12 to 14 pitch 4 blade Zinger prop. Fligt times are around 4 - 6 min . Not sure how accurate eCalc is however. It looks fairly comprehensive. I get better results using 10S than 12S, this was a surprise, too. Better meaning cooler motor temps.
Mark |
"I get better results using 10S than 12S, this was a surprise, too. Better meaning cooler motor temps."
Look at the E-Calc wattage. It's possible that 10S is not using the motor to it's full capability. You may need to change pitch or length a bit if you have limited choices of prop size. E-Calc is good, but not perfect. Even with it, you may end up changing a prop size or pitch slightly. The higher pitched props are usually less efficient, as are the 4 blade ones. E-Calc cannot completely add the resistance of the high current wire and connectors. (Too much variation between things.Connectors, wire length, wire size.) At 150A, there can be a noticeable difference. |
Yeah, the motor data shows about 4500W and the motor is rated for 6000W. But when I use 12S the motor temp goes to around 180 deg or more.
Thanx, Mark |
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