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Old 02-08-2014, 05:56 PM
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Leemata
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Default Questions from an electric noob

Hello all!

Brief history:

I've been involved on & off with the hobby since 1986 mostly with glow power. I do have a little electric foamy as well as a slightly larger electric RTF. I've also tried scratch building with good success.

I was given a partially completed scratch built electric park flyer by my dad. It's from Model Airplane News plans (Aug-2000) and it's called Mega Pepper. It's a balsa & lite ply construction with a 44" span and a wing area of 352 sq. in. Weight is 17 oz.

He has the fuse mostly completed and has a Mabuchi 400 on a GWS MO A 60T gear box installed. I plan to attempt finishing it for him as his health prevents him from doing so.

Will I need a speed controller and if so, what would be a good choice? Also, what battery would be correct for this plane/motor combo?

Any input would be appreciated.


Terry

Last edited by Leemata; 02-08-2014 at 05:58 PM.
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Old 02-09-2014, 12:23 AM
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Bozarth
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The motor is a cheap brushed Speed 400 version which was built around 6v and approx 15 amps. Brushed motors are like vcr tapes. For just a few bucks you could step up to a brushless motor. But if not, at least use a lipo.

Setup no.1) Mabuchi 400, 20 amp brushed speed control, 6.0 v nicad or nimh battery. Dinosaur configuration.
Setup no.2) Mabuchi 400, 20 amp brushed speed control, 2 cell lipo (7.2 v) battery 1350mah
Setup no.3) Brushless inrunner motor, same gear box, 20 amp brushless speed control, 2 or 3 cell lipo battery 1350 mah
Setup no.4) Brushless outrunner, no gear box, 20 amp brushless speed control, 2-3 cell lipo battery 1350 mah.

Go to E-flite's website and copy their setups.

Kurt
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Old 02-09-2014, 03:59 AM
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As mentioned, the 400 type motors were good at the time but they were prone to failure from too much current. If you want to keep it for nostalgia then make sure not to over-prop it and kill it with current. A 2 cell lipo will be fine and a 18-20 amp brushed esc as this motor likes to be around 12 amps.
I believe the gearbox is a 2.14:1 ratio so I think a 9x7 prop should work.
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Old 02-09-2014, 05:31 AM
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Very enlightening.... thanks guys. I knew the 400 motors were old school. I'll see about a brushless. Thanks again!


Terry
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Old 02-16-2014, 08:16 AM
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aeajr
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Good luck finishing the project.

you might find this helpful:

EVERYTHING YOU WANTED TO KNOW ABOUT ELECTRIC POWERED FLIGHT
http://www.rcuniverse.com/forum/m_7100376/tm.htm
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Old 02-22-2014, 07:00 AM
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Originally Posted by Bozarth View Post
The motor is a cheap brushed Speed 400 version which was built around 6v and approx 15 amps. Brushed motors are like vcr tapes. For just a few bucks you could step up to a brushless motor. But if not, at least use a lipo.

Setup no.1) Mabuchi 400, 20 amp brushed speed control, 6.0 v nicad or nimh battery. Dinosaur configuration.
Setup no.2) Mabuchi 400, 20 amp brushed speed control, 2 cell lipo (7.2 v) battery 1350mah


Setup no.3) Brushless inrunner motor, same gear box, 20 amp brushless speed control, 2 or 3 cell lipo battery 1350 mah
Setup no.4) Brushless outrunner, no gear box, 20 amp brushless speed control, 2-3 cell lipo battery 1350 mah.

Go to E-flite's website and copy their setups.

Kurt
Thanks Kurt. Is there a particular brushless inrunner you can recommend to replace an old Mabuchi 400? I'm still a bit confused.

Terry
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Old 02-22-2014, 12:27 PM
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Terry,

Look at the E-flite Park 370 and 400 Brushless Inrunner motors. They are probably very close to the same size as your Mabuchi 400 and might fit in your existing gear box, but are made differently internally, thus the additional wire (and the need for a different ESC). Brushed motors and speed controls have two wires. Brushless motors and speed controls have three.

Kurt
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Old 02-22-2014, 01:10 PM
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Thanks Kurt. Will do.


Terry
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Old 02-23-2014, 07:14 AM
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If you can fit an outrunner rather a complicated inrunner/gearbox combo.. this 58g one would do well with a 9x6/9x7/10x6 on 3s: http://www.buddyrc.com/sunnysky-x2212-13-980kv-ii.html [the motor is capable of spinning an even bigger prop, but I doubt you need more than 100W or so].


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Last edited by Dr Kiwi; 02-23-2014 at 07:21 AM.
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Old 02-23-2014, 10:27 AM
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Originally Posted by Dr Kiwi View Post
If you can fit an outrunner rather a complicated inrunner/gearbox combo.. this 58g one would do well with a 9x6/9x7/10x6 on 3s: http://www.buddyrc.com/sunnysky-x2212-13-980kv-ii.html [the motor is capable of spinning an even bigger prop, but I doubt you need more than 100W or so].


Thanks Dr. Phil, but I had already ordered a motor & ESV before you posted. I hope I did OK. Here's what I ordered:

[TABLE]
[TR]
[TD="class: main, align: right"]
[/TD]
[TD="class: main"][/TD]
[TD="class: main"]E-flite Park 400 Brushless Inrunner Motor (4200kV)[/TD]
[TD="class: main, align: right"][/TD]
[/TR]
[TR]
[TD="class: main, align: right"]
[/TD]
[TD="class: main"][/TD]
[TD="class: main"]SuperTigre 20A Brushless ESC[/TD]
[/TR]
[/TABLE]


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Old 02-23-2014, 02:51 PM
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Dr Kiwi
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Good motor choice, but I'm concerned about your gearbox... if the ratio really is only 2.14:1 you are stuck with spinning a very small prop (your effective Kv is 1960Kv). If you want to spin a 9" prop I'd think you would need 'E' gear.. 3.40:1 (you effective motor Kv would be 1235Kv).

[TABLE="width: 100%"]
[TR]
[TD="bgcolor: #d8d8d8, align: center"]A :
[/TD]
[TD="bgcolor: #d8d8d8"] M0.4x60T
[/TD]
[TD="bgcolor: #d8d8d8"] M0.4*28T
[/TD]
[TD="bgcolor: #d8d8d8"] 60T/28T=2.14
[/TD]
[/TR]
[TR]
[TD="align: center"] B :
[/TD]
[TD] M0.4x62T
[/TD]
[TD] M0.4*26T
[/TD]
[TD] 62T/26T=2.38
[/TD]
[/TR]
[TR]
[TD="bgcolor: #d8d8d8, align: center"] C :
[/TD]
[TD="bgcolor: #d8d8d8"] M0.4x64T
[/TD]
[TD="bgcolor: #d8d8d8"] M0.4*24T
[/TD]
[TD="bgcolor: #d8d8d8"] 64T/24T=2.67
[/TD]
[/TR]
[TR]
[TD="align: center"] D :
[/TD]
[TD] M0.4x66T
[/TD]
[TD] M0.4*22T
[/TD]
[TD] 66T/22T=3.00
[/TD]
[/TR]
[TR]
[TD="bgcolor: #d8d8d8, align: center"] E :
[/TD]
[TD="bgcolor: #d8d8d8"] M0.4x68T
[/TD]
[TD="bgcolor: #d8d8d8"] M0.4*20T
[/TD]
[TD="bgcolor: #d8d8d8"] 68T/20T=3.40
[/TD]
[/TR]
[TR]
[TD="align: center"] F :
[/TD]
[TD] M0.4x70T
[/TD]
[TD] M0.4*18T
[/TD]
[TD] 70T/18T=3.90
[/TD]
[/TR]
[TR]
[TD="bgcolor: #d8d8d8, align: center"] G :
[/TD]
[TD="bgcolor: #d8d8d8"] M0.4x72T
[/TD]
[TD="bgcolor: #d8d8d8"] M0.4*16T
[/TD]
[TD="bgcolor: #d8d8d8"] 72T/16T=4.50
[/TD]
[/TR]
[TR]
[TD="align: center"] H :
[/TD]
[TD] M0.4x74T
[/TD]
[TD] M0.4*14T
[/TD]
[TD] 74T/14T=5.28
[/TD]
[/TR]
[TR]
[TD="bgcolor: #d8d8d8, align: center"] I :
[/TD]
[TD="bgcolor: #d8d8d8"] M0.4x76T
[/TD]
[TD="bgcolor: #d8d8d8"] M0.4*12T
[/TD]
[TD="bgcolor: #d8d8d8"] 76T/12T=6.30
[/TD]
[/TR]
[/TABLE]

Last edited by Dr Kiwi; 02-23-2014 at 03:14 PM.
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Old 02-23-2014, 02:59 PM
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Earlier I ordered an E-Flight 6.6:1 gearbox and some 10 x 4.7 & 10x7 slow flyer props.


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Old 02-23-2014, 03:14 PM
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Okay, you are good to go!
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