Electric Warbird: Help with ESC Selection
09-12-2014, 11:09 AM
#1
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
Thanx, Mark
09-23-2014, 08:26 AM
#2
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
Thanx, Mark
Last edited by mark IX; 09-23-2014 at 08:28 AM.
10-12-2014, 09:26 PM
#3
Senior Member
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.
(Depends on prop size, the make/model of the ESC, etc.)
I'd suggest that you consider using an external BEC.
10-13-2014, 10:57 AM
#4
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
Mark
10-14-2014, 01:19 AM
#5
Senior Member
"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.
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.
Last edited by chuckk2; 10-14-2014 at 01:38 AM.
