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Power Systems Talk about motors, ESC speed controllers, gear drives, propellers, power system simulators and all power system related topics

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Old 11-13-2012, 04:23 AM   #1
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Default Hobby King motor to replace 61 glow ...

OK ... here's a question ...

I have a biplane of 56" wingspan, about 7lbs ... (1.4m x 3.2kgs)

Designed for straight 61 Glow and 12x7 ... 13x7 prop ... I use it on a RCGF 15CC gasoline ... yes it's overpowered.

But I am thinking to use the RCGF on another model and want to convert the biplane to electric.

I want plenty of power ... plenty of oomph so she climbs reasonably vertical but not necessary unlimited ...

I have to ask that suggested motors be based primarily on Hobby King or secondary on Hacker equivalents - as I am not able to buy from USA outlets ... Budget of course - as I'm a cheapskate !!

Here's the baby in her gasoline 'mode' ....









Over to you guys ....

Nigel

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Old 11-13-2012, 05:37 AM   #2
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Default

Check these:


Turnigy Aerodrive SK3 - 4250-410kv Brushless Outrunner Motor


Hobbyking 70amp OPTO ESC with 5 Amp External UBEC



Run that on 5 cells and you'll be able to really spin a deep prop like a 13x10, and you arent stressing the setup.
You could start with 4000 mAh 5 Cells and try to get that to balance, and get a decent 7~10 minute flight.

Of course, every setup should be watt meter verified.

Electricity... It's not just for light bulbs anymore.

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Dinogy Lipos professional grade energy

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Old 11-15-2012, 01:54 PM   #3
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Cheers ... I looked at the SK3 series ... but various comments talk about magnets breaking loose etc.

I note you pick the lower KV motor instead of the higher ... and of course needs the 5S ...

Would you think a higher KV on a 4S ?

Nigel

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Old 11-15-2012, 08:04 PM   #4
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Originally Posted by solentlife View Post

I note you pick the lower KV motor instead of the higher ... and of course needs the 5S ...

Would you think a higher KV on a 4S ?

Nigel
Any combo can be made to work, but lower voltage means higher current draw... which means lower flight time [and because of I^R, more waste heat to be dissipated].

Cheers, Phil
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Old 11-15-2012, 09:00 PM   #5
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Originally Posted by solentlife View Post
OK ... here's a question ...

I have a biplane of 56" wingspan, about 7lbs ... (1.4m x 3.2kgs)

Designed for straight 61 Glow and 12x7 ... 13x7 prop ... I use it on a RCGF 15CC gasoline ... yes it's overpowered.

But I am thinking to use the RCGF on another model and want to convert the biplane to electric.

I want plenty of power ... plenty of oomph so she climbs reasonably vertical but not necessary unlimited ...

I have to ask that suggested motors be based primarily on Hobby King or secondary on Hacker equivalents - as I am not able to buy from USA outlets ... Budget of course - as I'm a cheapskate !!

Here's the baby in her gasoline 'mode' ....




Over to you guys ....

Nigel
If you want power, something on the order of a $$$$ Hacker A50-12S, 5S LiPo, and a 15X10 APC-E prop will do pretty good. I've got two of them on 8 pound airplanes, running on 6S2P A123 battery packs. That power system hauls the 8 pound models straight up out of sight. These Hacker motors are available in a number of different KV's (different windings) for the same motor frame, to match what you need for your model. The www.motocalc.com computer program is fairly accurate on predicting how the Hacker motors/props/battery packs will perform.

Or a little less power, the Hacker A40-10L motor.

Going to a lighter LiPo 4000 Mah or so battery would perform even better.

(Also have an A30, two A40's one more A50 and two A60's. All have performed well, easily matching their specifications over the past several years. Just had a steel shaft set screw issue last summer on the A60-16M motor after 160 flights. That's it. No I don't work for Hacker, wish I did!)

http://www.aero-model.com/Hacker-Bru...By-Series.aspx

DennyV
Retired and the days are just too short, busier than ever!
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