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Old Mar 01, 2014, 09:25 AM
Condescending Pedant
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Looking good Charger. When you do your motor/prop/battery tests, I would be interested in getting the info. I like the looks of the Rimfire motors, but it seems to me some of the sizes are a little optimistic on their operational specs.
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Old Mar 02, 2014, 06:08 PM
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OK I did my testing on the power setup today here are some specs and what I got on the watt meter. Battery 18.5v 30c 4500mah Esc dynam detrum 80a Motor Rimfire .46 42-60-800 Max. Constant Current: 60A
Max. Surge Current: 100A
Max. Constant Watts: 1110W
Burst Watts: 1850W
No Load Current: 4.6A
Input Voltage: 18.5-22.2V (5-6S LiPo)
RPM/V (kV Rating): 800
Weight: 9.5oz (268g)
Suggested Propeller Size: 10 x 5E-11 x 5E

Both tests were run for 60 seconds

First test using 11x5.5E prop 871.6 wp 2.0wh 43.91ap 19.66vm 0.105ah
Battery was 20.90v to start and 20.77 after

Second test using 10x5E prop 675.6wp 1.8wh 33.84ap 19.79vm 0.094ah
Battery was 20.77v to start and 20.69 after

The plane weighs in at 7 pounds 14oz RTF If I understand it all correctly both tests are within the specs of the motor and esc and the better setup to run would be with the 10x5 prop please give some feedback and thoughts on this setup thanks.
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Old Mar 02, 2014, 08:01 PM
Condescending Pedant
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It looks like either prop would do the job. According to some of the posts, 50-70 watts per pound for a trainer is enough. You have 100 watts per pound. Should perform well. According to the specs I found the max continuous current is 60 amps and you are well under that so motor should be very happy. Deff. under on max watts.
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Last edited by Mike Dubovsky; Mar 02, 2014 at 08:10 PM.
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Old Mar 02, 2014, 08:03 PM
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Put a 12x8 on it!
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Old Mar 02, 2014, 08:16 PM
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Would a bigger 12x8 give me longer flight times ? If it stayed in specs that is
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Old Mar 02, 2014, 08:21 PM
Condescending Pedant
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The bigger the prop, the more power it takes at full throttle. However, if you throttle back to just enough power to fly it how you like, you will get longer flight times. I am not sure how a bigger prop throttled back to say 50% would compare to a smaller prop throttled back to 60% would work out. I guess the best way to find out would be to try it both ways, run the throttle where you need to to fly it like you want to and see which one gives you better battery life. That is one of the fun parts of this hobby, making experiments like that.

I know the bigger prop will give you better performance, but on a trainer, I wonder how much you will notice it.
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Old Mar 02, 2014, 08:43 PM
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Just looked threw my props and I just happen to have a new 12x8E APC will have to balance it tomorrow and give it a try. Will post the test results when I do built this plane for relaxing flier and to hopefully teach my niece's and nephew to fly one day buddy box of course. hoping once they fly the real thing and not on my sim they will get the bug.
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Old Mar 03, 2014, 03:10 PM
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I tested the APC 12x8E big difference
1401.0 wp
2.4 wh
77.22 ap
19.03 vm
0.124 ah
Was a handful to hold back with that prop little to much for it I think.
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Old Mar 03, 2014, 04:50 PM
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Yes, a little more than the max continuous. Some would say fly it and use "Throttle Management" to avoid ruining your motor, I would say don't use it. You won't need it anyway.
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Old Mar 05, 2014, 06:04 PM
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How much are you going to actually run wide open? Not very much. The extra pull can come in very handy in certain situations.

What if you back off to 4s with the 12x8?
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Old Mar 05, 2014, 10:23 PM
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Good point I have a few 2200 4s in the 25c range might have to give them a run up and see what the meter shows. Wouldn't I lose a bunch of run time unless I use 2 batteries ?
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Old Mar 06, 2014, 06:15 PM
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Yeah, you would lose a lot of flight time cutting your mAh in half like that. But you could run two, as you said.
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Old Mar 26, 2014, 11:46 PM
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Finely got around to putting a receiver in and cleaning up the wiring also got to the balancing of it. It was still tail heavy bad even with the battery in it I moved the motor a little forward to help and still had to add 6 ounces to the nose to balance it. Going to maiden it this way and fly it for a while if this weather will ever cooperate. My plan is to wait for the next building weather to lighten the tail and do a recover. I just don't care for all the lead I had to add I would do it now but I am eager to fly this plane.
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Old Mar 27, 2014, 11:21 AM
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You could add a good 1500 to 2000mha with 6oz/171grams...

http://www.hobbyking.com/hobbyking/s...SortOrder=desc
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Old Apr 26, 2014, 11:36 PM
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Got to the maiden of this plane finely glad to say it flies as it should. I am still not happy with all the lead I had to add though so I am going to remove the covering from the tail and do some lightening. My plan is to use different size hole saws in the rudder and elevator surface. Three holes on the rudder and three on each side of the elevator these are solid and when building I wanted to lighten them and now wish I had. Over all I am happy with this plane and the power setup I used is more than enough for it. Once the new mods are done I will post my thoughts on before and after flights my hope is with less weight I will get a little better response and feel from the plane.
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