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Old Jun 21, 2006, 11:24 PM
That should fly!
Admiral_Red's Avatar
San Antonio, Texas
Joined Oct 2001
2,406 Posts
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15 Y/O .60 sized Curare to electric. Power suggestions please!

A friend asked me about converting a Curare Pattern plane he used as a teenager to e-power. I have been researching V28 batteries, and might just suggest them as a power source. I have a 77opto controller I can donate to the cause, so 10S is a posibility. That also sits in line with an Astro 109 for charging use as they are low cost and can hit a 3C charge current which the V28's are happy with. I am looking for power system suggestions based on 10S2P V28 power. Maybe I am going down the wrong path in thinking V28's?

The airframe weighs 3lbs 14oz with retracts and no servos, and 10S2P Emoli's should weigh about 3.2lbs. The goal is better than 1:1 thrust to weight for the whole flight, pitch speeds of about 60-70mph, and a flight time of 8-10 minutes. I would like to keep the weight to 8.5lbs max.

I am open for suggestions, please fire away! Available funds for the project are 450-550 including motor and at least one battery as I have a UBEC and ESC for it.

Thanks!

Edit: I realize that this might should be in the electric conversion forum instead. Please move it if appropriate.
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Last edited by Admiral_Red; Jun 21, 2006 at 11:31 PM.
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Old Jun 22, 2006, 04:16 AM
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vintage1's Avatar
East Anglia, UK
Joined Sep 2002
29,687 Posts
Have a look at the AXI 4130 range...
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Old Jun 22, 2006, 09:29 AM
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Joined Oct 2003
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could it be that 3000ma is all you would need/want for this set up as 10cell in line make a bunch of power......10s2p is a lot of weight in e-molies.
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Old Jun 22, 2006, 11:58 AM
That should fly!
Admiral_Red's Avatar
San Antonio, Texas
Joined Oct 2001
2,406 Posts
I have actually backed up from 10S to 7S2P. I think from looking at the specs, a Feigao 540XL 9T with the 5.2:1 and a 16x10 will get the job done nicely.

Edit:
Cells = 7
Gear Ratio = 5.20
Diam (in) = 16.0
Pitch (in) = 10.0
Weight (oz) = 77.3
Batt Amps = 54.7
Motor Amps = 54.7
Motor Volts = 18.9
Input (W) = 1037.2
InPLd (W/lb) = 214.7
Loss (W) = 134.0
MGbOut (W) = 903.3
OutPLd (W/lb) = 187.0
MotGb Ef(%) = 87.1
Shaft Ef(%) = 63.7
Motor RPM = 33725
Prop RPM = 6486
Thrust (oz) = 160.9
PSpd (mph) = 61.4
RofC (fpm) = 3529
Time (m:s) = 6:35
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Last edited by Admiral_Red; Jun 22, 2006 at 12:14 PM.
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Old Jun 22, 2006, 03:39 PM
100% electric since 1990
twest's Avatar
United States, MA, Ware
Joined Jul 2001
1,403 Posts
I was going to suggest an astro 40 brushless geared, but it looks like the feigao motor has nearly identical specs, and probably costs a bit less.
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