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Need Electric Replacement for 50cc Gas Engine

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Old 10-09-2018, 03:57 PM
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All Day Dan
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Default Need Electric Replacement for 50cc Gas Engine

I am interested in powering a 50cc, 20 pound model with an electric motor. I use a 20X10 propeller that spins at 7000rpm. I would appreciate any input as I have not followed the development of electrics st all. Thanks, Dan.
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Old 10-09-2018, 05:16 PM
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https://www.modelmotors.cz/product/detail/268/
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Old 10-09-2018, 06:44 PM
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Thank you, Propworn. Dan
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Old 10-12-2018, 09:54 AM
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Prop, Do you know of any websites in the US that stock these?
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Old 10-13-2018, 11:42 AM
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Propshop Hobbies got mine for me. Didn't stock it but found it for me and ordered it. Least inexpensive around that I could find. Ask for Matt.
Prop Shop Hobbies, Inc.
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Old 10-13-2018, 02:30 PM
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Thanks again. Dan.
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Old 10-27-2018, 04:37 PM
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Don't replace cc's Dan, doing gas<>electric equivalencies limits choices and ranges.
To a propeller, gas kilowatts are not the same as electric kilowatts.
Plane type and mass are leading.Vriendelijke groeten Ron
• Without a watt-meter you are in the dark ... until something starts to glow •
e-flight calculatorswatt-metersdiy motor tipsCumulus MFC

Last edited by ron_van_sommeren; 10-27-2018 at 04:39 PM.
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Old 10-27-2018, 06:33 PM
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Ron, Thank you very much for all that important information. Right now I feel that the conversion of my 50cc gas powered models will be more complex than I initially thought. I will read through all those websites and see what they have to say. Thank you, again Dan.
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Old 10-28-2018, 04:27 PM
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If this is your first e-plane/experencie: e-motors are way more dangerous than gas engines.

I think it is safer/better/simpler/easier/cheaper/safer to start with a low power plane, motor setup, learning curve and all. To get some e-routine and e-knowledge with a cheap setup and plane?
I would learn the (e-)ropes/routine/knowledge/experience with a less powerfull model, cheaper setup.
E-motors can start all of a sudden, without warning, with full torque available right from zero rpm up to full rpm, merrily hacking away at fingers, leg, private parts, with full and unstoppable force.
Motor and/or controller can go up in smoke in an instant, without the warning you get when an IC motor starts to run lean. And once the smoke is out, you can't put it back in.
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Old 10-28-2018, 04:28 PM
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Without a watt-meter you are in the dark.
Until something starts to glow
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Old 10-28-2018, 04:30 PM
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Keep controller(s) close to battery, extend motor wires.
Keep the battery wires short, or else install extra capacitors.

Too long battery wires can kill ESC: precautions, solutions & workarounds - RCG
Contents
  • Solutions I & II, rules of thumb
  • Problem
  • Capacitor type & polarity (orientation!)
  • How & where (not) to add extra capacitors
  • DIY capacitor pack pictures
  • Capacitor & pack suppliers
  • Expert/manufacturer opinions, they all say the same ... & their rules of thumb.
  • Explanation, water hammer/knock analogy, theory, references, measurements

Vriendelijke groeten Ron
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Old 10-28-2018, 08:06 PM
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Thanks Ron for some more needed information. I'm stuck with 50cc 20 pound planes because that is all I have. It is too late for me to start on a long learning process because I am approaching 80 rapidly. Luckily I was an aerospace electrical engineer for 40+ great years so I am not starting from zero. I have seen the horrors electric powered planes can do at the field and was almost a victim as one of them chased me before the owner could get it under control. Dan.
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