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monster power 46 on showtime 50

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Old 01-10-2011, 02:16 PM
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tractor1964
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Default monster power 46 on showtime 50

where do i start,,, ok my monster power 46 came in today. im gonna put it on my showtime 50. need some advise, it calls for 4-5 cells li-po or 12-16 ni-mh. will a 6 cell lipo harm the motor?how would nimms work? lets say two 7 cell packs 3300s. it max burst is 55amps and continuous current is 40amp, kv is 670 with 800watts. will a 60amp speed controler word? i know im gonna have to add weight to the front of the plane to balance it so i thought about heaver nimm batterys. has anyone used this motor? its a 50-55 kv670. any advice i can get will healp, thanks john 251-402-9386
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Old 01-13-2011, 01:43 PM
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Default RE: monster power 46 on showtime 50

Read this, it will help you estimate the wattage and such.
http://www.mycoolrc.com/SizingMotor.html
This will only help you ESTIMATE withing like 10% I've found.

The internal resistance of your batteries makes a BIG difference.

I recall trying a APCe 10x7 on either 5S or 6S on my MP 46 and it was like the RPM and power of an OS .46. I'll have to look up my test data.


BTW, I've run more cell count on some monster power motors. I just keep it below max wattage and it won't heat up. Make sure you have good airflow. Higher RPMS means you may get vibes to balance that prop and make sure you ream it straight if the prop does not have an adaptor that fits. Most APCe props fit great on the MP motors and you just use the included adaptor on the back.

The ESC will tell you max cell count usable on the web page you got it from but most 60A ESCs should work fine on 6S.

Get yourself a wattmeter. Hobbyparts has the AEO P0 wich is cheap and works fine.
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Old 01-14-2011, 07:55 AM
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Default RE: monster power 46 on showtime 50

tractor,
Here is the prop data I found from when I took it:
MP46 Kv test
12.26V 8320RPM measured 680KV using 3S (I measured the true Kv using NO prop and a 3S battery).
5S Gens Ace 3300mAh 25C 2mOhm per cell 10x7 APCe 20.6V 12000RPM 36A 19.7V under load 710W
5S Gens Ace 3300mAh 25C 2mOhm per cell 11x8.5 APCe 19.95V 10600RPM 55A 18.5V under load 1017W
5S Gens Ace 3300mAh 25C 2mOhm per cell 10x10 APCe 19.7V 10700RPM 47A 18.6V under load 874W

Note, the Gens Ace battery is a really good battery and low internal resistance (like 1-2milliohms per cell). so if you have a weaker battery on 5S, it will be lower wattage.
If you use 6S, you can see your RPMS would be higher and you probably would not want to go full throttle for long and watch for vibes. If you have mid grade 6S packs a 10x7, 11x6 or say 12x5 may be ok, but you definitly need to keep a wattmeter on it when you static test it.

You can get away with bursts above the spec Current or wattage on the motor, but be careful with that as well as the current on the ESC. I've Propped to burst more than the Motor wattage, but I seldom burst more than the ESC. Over taxing a motor will burn the motor I find, but over taxing the ESC I find will actually start fires.
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