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Help me decideon prop size, please.

Old 03-24-2013, 08:59 PM
  #1  
HugoW
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Default Help me decideon prop size, please.

Hi,
I'm putting together a no-name ARF P51, span 1600mm, AUW I'm aiming at 4kg. I will run it on a 6S pack, 80A ESC. I found an old Turnigy C5065-400 in the workshop, which I think is the one to use. But the HK site does not show it anymore and I don't find good references. I would like peak around 60-70A. How do I determine what prop to use, without buying a dozen and try?

Thanks,

Hugo
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Old 03-24-2013, 10:41 PM
  #2  
kyleservicetech
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Originally Posted by HugoW View Post
Hi,
I'm putting together a no-name ARF P51, span 1600mm, AUW I'm aiming at 4kg. I will run it on a 6S pack, 80A ESC. I found an old Turnigy C5065-400 in the workshop, which I think is the one to use. But the HK site does not show it anymore and I don't find good references. I would like peak around 60-70A. How do I determine what prop to use, without buying a dozen and try?

Thanks,

Hugo
Check out those computer programs such as www.motocalc.com, (Free for 30 days, then $39 USA). With these programs, you input the motor specifications, motor battery, range of propellers, model wingspan/area, and motocalc spits out its opinions on what will work.

Problem is Turnigy doesn't provide the winding resistance of their motors, and that easily measured winding resistance is critical on how the motor will perform. This winding resistance can be measured with a pair of voltmeters, a battery and a power resistor, even an automotive tail light will work.

Measuring Brushless Motor Resistance
http://www.wattflyer.com/forums/showthread.php?t=50740

As indicated, there are also other free computer programs with a bit less capability.

As for conversions of a glow type model airplane to electric power, with the very high power capabilities of the modern brushless motors, it's not hard to come up with a package that can and will equal or even exceed flight performance of that model with a glow power system. Big advantage of glow, is longer flight times. Even so, 6 minutes flying time with electric is not hard to achieve.

I've posted these threads on "Electrifying medium size models" in wattflyer many times, take a look:
Thread on 70 size glow engine conversion to electric
http://www.wattflyer.com/forums/showthread.php?t=45222

Hacker 6S2P A123 powered Models
http://www.wattflyer.com/forums/showthread.php?t=44686

Hangar 9 Kantana Model
http://www.wattflyer.com/forums/showthread.php?t=68844

AEAJR's Site on Electric Power
http://www.wattflyer.com/forums/showthread.php?t=18521
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Old 04-01-2013, 02:15 AM
  #3  
Dr Kiwi
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http://www.draneer.com/OlympicFlying...a330L_Dendron/


He used 15x7x3 on 6s
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