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Old Mar 05, 2012, 08:13 PM
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critique my power choices for this project plane

I'm a rookie at powering up planes, I purchased one cheap as a project plane. (I also have a radian I fly) The goal for this plane is really just to learn more about all components and how they work together and reuse components for future projects. If the plane flys decent at all is a bonus. The plane is actually a small glider. Here are my components, any comments appreciated as to if they are appropriate or not. Ordering servos, motor, etc. from hobby king, going cheap here just for practice parts to learn with.

Plane: slope soarer with ailerons, elevator, & rudder. I'm going to attempt to rig a motor on it. weight of plane with anticipated electronics, motor, bat., etc
= 1.3 lb. (approx)

Motor:. brushless outrunner
volltage: 11.1v or 14.8v (3-4S)
Kv: 1534RPM/V
Depending on the prop I use (7x6) will give me about 1.6 lb. thrust which is a little over 1:1 thrust to weight.

ESC: 25-30 Amp (Max current of motor is 15A) (rating too high????)
Bat: 1000mAh 3S 30C Lipo (too big of a battery????)
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Old Mar 06, 2012, 09:19 AM
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Chattanooga, Tennessee, United States
Joined May 2003
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If that is the E-max CF 2212/2812 motor then it won't cut the mustard....my test motor came out as ~1700Kv... and with a 7x6 on 3s (which is where I assume you got that 1.5lb of thrust) it will fry... mine was drawing 17A at only 9.9v, was unstable, and reached 65C VERY fast...... probably would have been close to 21A on 11v.
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Old Mar 06, 2012, 11:20 AM
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Quote:
Originally Posted by Dr Kiwi View Post
If that is the E-max CF 2212/2812 motor then it won't cut the mustard....my test motor came out as ~1700Kv... and with a 7x6 on 3s (which is where I assume you got that 1.5lb of thrust) it will fry... mine was drawing 17A at only 9.9v, was unstable, and reached 65C VERY fast...... probably would have been close to 21A on 11v.
Thanks for input, its actually this motor:
http://www.hobbyking.com/hobbyking/s...er_1534kv.html
which is where I got the thrust data from, someone in one of the threads I was reading had been using this motor and liked it.

The plane I was going to stick it on was this (a LHS was getting rid of them cheap)
:
http://www.rcsail.com/easy.htm

I wanted to keep the motor small to keep the weight down on front of plane, maybe this is too small.
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Last edited by Meach_in_GA; Mar 06, 2012 at 11:30 AM.
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Old Mar 06, 2012, 03:05 PM
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That is exactly the same motor as the one I tested (with an E-max label).
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Old Mar 06, 2012, 04:11 PM
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Thanks for your time, yea I thought it might have been same motor with different label which is typical of a lot of stuff these days. Doing a search I ran across a thread from a wile back where you tested this and some other motors, I'll have to go back later and read thru the thread to learn more about the details of motors. I'll have to spend some more time on searching out info on some of these motors, realizing you get what you pay for. I recall reading where someone said to beware of specs that they aren't always true.
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Old Mar 06, 2012, 04:24 PM
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Joined Oct 2008
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Match up your specs to a Suppo motor from BPHobbies, much better motor in my opinion. maybe the good Dr will chime in with his recs. Doug B
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Old Mar 06, 2012, 07:57 PM
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Well Doug... it would help if I knew what the correct size prop would be for a glider like this ... if a 7x5 would work, and WOT was limited to brief bursts to gain altitude, I reckon a 38g Suppo 2208/12 might do the trick:

7x5 APC E: 10.7v, 18.70A, 200W, 12120rpm, 57.4mph, 725g, 25.53oz, 3.63g/W
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