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Old 07-13-2016, 12:03 PM
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electric motor compared to 100 to 120cc gas

I am interested in building a pilot 35% extra. Pilot recommends a gas motor from 100cc to 120cc. What would be an electric motor equivalent to these gas motors.
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Old 07-13-2016, 05:57 PM
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Do you have noise restrictions at your field?
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Old 07-14-2016, 10:11 AM
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Yes
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Old 07-14-2016, 03:04 PM
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Here's a few common ones, you should use a minimum 160A 12s ESC, but 200-300A would be best


Minumum sport/3D power use:
Hacker Q80-8M 28
Hacker Q80-7M 28
turnigy ca80 160kv (50-80cc equiv) but many fly 25lb 100cc planes well with a 26x10 prop



High power 3D use:
Hacker A100-8
Hacker A100-10
Hacker Q80-5L 28
Hacker Q80-6L 28
Turnigy ca120 150kv (12070)
Turnigy RotoMax 100cc
turnigy ca80 160kv (50-80cc equiv) but many fly 25lb 100cc planes well with a 26x10 prop

Plettenberg has motors too, but they cost a lot
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Old 07-14-2016, 10:04 PM
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Can you run headers and mufflers? Your gonna spend a fortune on batts.
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Old 07-15-2016, 04:39 AM
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And short flight times, no matter how they sugar coat it at RCGroups, awesome power with new batteries but they soon sag and if you get a 5m flight you are lucky or you are babying your batts. Silly stupid wicked or whatever geeky way they describe 4m of power.
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Old 07-15-2016, 05:11 AM
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Quote:
Originally Posted by Nutball View Post
Here's a few common ones, you should use a minimum 160A 12s ESC, but 200-300A would be best


Minumum sport/3D power use:
Hacker Q80-8M 28
Hacker Q80-7M 28
turnigy ca80 160kv (50-80cc equiv) but many fly 25lb 100cc planes well with a 26x10 prop




High power 3D use:
Hacker A100-8
Hacker A100-10
Hacker Q80-5L 28
Hacker Q80-6L 28
Turnigy ca120 150kv (12070)
Turnigy RotoMax 100cc
turnigy ca80 160kv (50-80cc equiv) but many fly 25lb 100cc planes well with a 26x10 prop

Plettenberg has motors too, but they cost a lot
Does EF have a motor in their new XPWR line up in this size?
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Old 07-15-2016, 07:24 AM
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They only go to 60cc


A carefully tuned setup with the right mufflers and prop could get an engine below 90db and lower if you really work at it.
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Old 07-15-2016, 10:10 AM
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I have 100cc on mtw cans and 3blade prop. Very quiet. And yes you will spend $1000 to 1500 on batteries to fly for the day if you don't plan on running a generator.
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Old 07-15-2016, 10:13 AM
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I personally think once you get above the 5 to 6hp range it's not worth going electric
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Old 07-15-2016, 10:28 AM
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Agreed, a lot especially over at RCGroups will say a DA70 is far more expensive, but when you factor batteries, a power supply and a battery charger into the equation the DA is the cheaper option, especially in the long run.

Silly stupid wicked geek 4minute power, or cheap consistent 12min power, electric is ok for the 60" models, but hey if you like electric that is fine but be careful with advise from RCGroups.
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Old 07-15-2016, 12:14 PM
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Yeah, big electrics are a massive waste of money, and they are heavy. Then, your $300 battery is gonna crap out in 2 years. From what I have seen a 30cc size electric is about the best bang for the buck if you must fly electric.
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Old 07-15-2016, 03:19 PM
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The batteries will sag in roughly 150 flights if you are lucky and that is if you look after them, the more crazy silly wicked geeky power you have the shorter your flight times as well. Sure you will have a ballistic take off but depending on motor choice in ~4 to 5 minutes you will need to land, and you won't have the same power.

Electric is for people who cannot tune an engine, learn to tune and baffle your engine and it will reward you with many years of service. Like Funboy I believe and it is only my opinion that 30cc is the very largest model I would fly as an electric.

Sorry to sound disgruntled but after taking advice from the Fanboys at RCGroups I have wasted many thousands of dollars to learn pretty much what Funboy and Gofly has summarised for me here.
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Old 07-15-2016, 06:57 PM
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So true. I run 12s 3300's on my custom wound Motrolfly setup in my 71" Slick. It's a 3500W setup on a 10.5lb airframe which is a crazy 333W/lb. While it's fun yes, it still doesn't even begin to hold a candle to my GP 123cc 35%'ers or my 40% setups on the larger airframes for XA, 3D, fun factor, wow factor or fly ability. It's a fun plane to huck, be stupid with and not worry about or be afraid of, but to me it just isn't the same as larger gassers. I torque roll it and tail touch it constantly (have ripped the rudder hinges out twice from so many tail touches, lol), but then again I do the same on my 35% gassers and its WAY more fun on the gassers, especially with smoke pouring out. Many of my friends have tried 50cc & 100cc electric setups, and every single one of them have dropped the electric setup within one season on anything larger than the 74" planes in favor of gas. Just not worth it, expensive, batteries crap out, pain to charge (even on our PL8's at 4 or 5C), and lame for sound and fun. 100% go gas unless it's 74" or smaller IMHO. Everyone I know personally will tell you the same thing. Just not worth it.

- Travis
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Old 07-15-2016, 08:46 PM
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Thankyou Tavis, I probably should take my own advice, I am a little cranky of my treatment at RCGroups but that is in the past now, dealing with forum fanboys is exercise in pure futility!

Electric is ok, but it poses certain troubles which are not apparent until money is spent and time has past, those that enjoy electric and have money to burn good on them, as is those whom enjoy their gassers.

I will say if I was in the market for a 60" extra, I would purchase electric, 74" possibly maybe electric, but 88" and above gas all way. This is purely my own advise and what I would do, it may not be what others agree with.
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