xXsnipedoggyXx

hi,

I have a really old glow trainer plane I got from a garage sale, I decided to covert it to glow, I was wondering what motor I should use, I don't care about speed just want to learn to fly on a budget, the glow motor that I took off is an O.S .40 that has no compression,

would something dinky like this work
​​​​​​https://www.amazon.ca/ZJchao-Hobbypo...0BXZBJ2YW0EVYY

rgburrill

I wouldn't touch that motor with a 10-foot pole. First, it's made for quadcopters so is way too small for a 40 size trainer. second, the specs say it's 1000kv with a 10 volt input but can get to 210,000 RPM!

For a 40 size glow engine you would need at least a 32 size electric motor.

I'm sure a piston and liner would be a lot chaper than converting to electric.

oliveDrab

Describe the plane - what's the wingspan? What's the weight with motor?

I converted all my glow planes to electric years ago and now all I fly is electric ... even my 9 ft wingspan Rascal 110 is electric. So I'm going to recommend electric.

oliveDrab

jrf

My Feedback: (551)

Go to towerhobbies.com and see what the recommended electric motor, speed control (ESC) and battery are for a 40 size trainer. Then go to hobbyking.com and buy the equivalent items.
Even at Hobby King prices, you are looking at well over $100.

xXsnipedoggyXx

https://m.ebay.ca/itm/SURPASS-4120-400KV-14-Poles-Brushless-Motor-for-RC-Airplane-Fixed-wing-/322275665541?_trkparms=aid%253D222007%2526algo%253 DSIM.MBE%2526ao%253D2%2526asc%253D20150519202400%2 526meid%253Dd55f3fb328144f4ab29960a282230aad%2526p id%253D100408%2526rk%253D6%2526rkt%253D25%2526sd%2 53D382176142721&_trksid=p2056116.c100408.m2460

how about this?

xXsnipedoggyXx

Then like this
https://m.ebay.ca/itm/ZTW-Beatles-60A-ESC-2-6S-LiPo-Battery-Brushless-5-5V-5A-SBEC-for-Airplane/331832028760?hash=item4d42baee58:gDEAAOSwcBhWVRr 1

xXsnipedoggyXx

The wingspan around 57 inches

oliveDrab

So you're looking at a 4120/14 motor, 400 kV (rpms per volt), with a 60 amp ESC, using a 6S Lipo. Ok ... and the plane you want to put it on is a trainer with a 57-inch wingspan. Wow. Seems like a lot of motor for a 57 span trainer. Also, not sure a 6S battery would fit in it. You might have to use two 3S Lipos in series. If you are considering going electric, measure the inside of the fuselage where the battery goes to make sure your battery will fit in it.

Do you have a picture of your plane? Sounds like a high-wing trainer with a rubber-banded wing maybe.

Just for comparison ... On my 71" LT-40, I use a 4120/18 AXI motor, 515 kV, 75 amp ESC, using a 6S Lipo. And it's plenty of motor ... the plane will easily go straight up vertical. By the way, I don't use the BEC on my LT-40's. I provide a separate 6.0 volt 5 cell NimH battery to power the receiver and servos. But using the BEC on your ESC to power the receiver and servos will be fine ... as long as you don't use too big of a prop which can burn out your ESC/BEC, cause your airplane to be uncontrollable, and cause you to auger in (crash).

An example of how to smoke an ESC/BEC: I had a Rimfire .60 motor that called for a maximum 12x6 prop. Was using a 6S Lipo, a 75 amp Castle ESC, was using the BEC that came with the ESC. Tested the plane on the ground with an ampmeter to verify the motor/prop combo was not drawing more than 75 amps. It was ok so I flew it and it was ok ... not spectacular but ok. Then tried a more aggressive prop ... a 12x8. Flew the plane with the 12x8, gave it full throttle, then the engine quit and the plane no longer responded to control inputs on my transmitter. It lost it's brain and pancaked into some tall grass - undamaged mostly. A postmortem revealed a smoked wire coming out of the ESC - can't remember exactly which one.

Anyway - long story short - don't put a prop on your plane that's too aggressive for the motor! Use the manufacturers recommended prop(s) as a guideline and it's a good idea to test the motor/prop on the ground before flying it. See how many amps your motor/prop combination is drawing. And if it's drawing more amps than your ESC and/or motor can handle, then go with a less aggressive prop.

xXsnipedoggyXx

It is a rubber band style, it has lots of room in the fuselage, I'll get some measurements tmr, I don't know much about motors and stuff just know enough how they work, wat size motor I should put, I really don't want to spend a lot of money on the plane, it came with my nitro piper cub, I just want to learn how to fly and not crash my nice plane, I have a speckrum dxe. I also bought a dynam dc3, so if I buy a battery and reciver I'll throw that stuff in my dc3, I think I need a 2200 3s. So what amp esc do I need to use this battery? And can u recommend the size motor if u say it's a lot of motor.

xXsnipedoggyXx

To clear up some confusion for me, say I have two motors 400 kv and 500 kv is the 500 kv more powerful?

oliveDrab

I'm uncertain about this aspect of electric flight. But I think a motor with a lower kv is more powerful than a motor with a higher kv. For instance, my 9 ft Rascal has an EFlite Power 160 which has 230 kV and swings an 18x10 prop. My 6 foot LT-40 has an AXI 4120/18 which has 515 kV and swings a 13x8e prop. kV means "rpm's per volt"

xXsnipedoggyXx

Ohh ok

xXsnipedoggyXx

How about this?
https://m.ebay.ca/itm/QX-MOTOR-2814-600KV-3-6S-14P-Brushless-Airplane-Motor-for-RC-Quadcopter-Latest/282630976868?hash=item41ce1e7564:g:nI8AAOSwdYlZpj5 F

Or should I go with a 500kv?

oliveDrab

Don't use that ... it's a quadcopter motor. Here's an example of a trainer plane from Hobby King that's got a 55 " wingspan: https://hobbyking.com/en_us/trainsta...___store=en_us
it uses a 3S Lipo, a 30 amp ESC, 850 kV motor all of which comes with the plane. Weighs just under 9 lbs.

Here's a video of the plane in action:
That plane flies great with a 3S Lipo, 30 amp ESC, and 850 kV motor ... and all that stuff comes with the plane. It even comes with a transmitter. All for $102. However, If you're gonna put a motor/esc/battery into your 57" plane... which is similar to the HobbyKing plane ... you probably don't need a 6S Lipo, 60 amp ESC, 400kV motor. I'll figure something out and get back to you with a recommendation.

Or maybe you should just buy that trainer from Hobby King. If you do decide to buy it, buy the "Mode 2" plane. It's got the throttle on the left stick.

xXsnipedoggyXx

Well I would but that plane, but I have three planes now, two ready to fly (almost) one nitro piper cub and one dynam dc3, and the other image project one, so I don't really want to buy another plane because I haven't even flown any of my planes yet because of a little accident with my prop vs fingers with the cub LOL, so I think I'll take a look on that size of motor, and esc. I buy a 4 channel reciver and after throw it in my dynam dc3.

xXsnipedoggyXx

https://m.ebay.ca/itm/RC-Plane-850kv-rpm-v-D3517-BL-Brushless-Outrunner-Motor/122860007393?hash=item1c9b06efe1:g:eRUAAOSwn25aMi5 2

how about this, only looking at the cheaper motors because I'm prob gonna fly the plane like couple times and move on

xXsnipedoggyXx

I'll try to send some pics of my plane

xXsnipedoggyXx

https://www.pinterest.ca/jakeysbuilds/rc-airplane/

this is an experiment, if u click the link u should see the pics of the plane... getting pre frustrated with how to post the pics LOL

oliveDrab

Consider buying this:
https://hobbyking.com/en_us/turnigy-...___store=en_us
https://hobbyking.com/en_us/hobby-ki...___store=en_us

Use a 4S Lipo.

Your plane looks kinda heavy. Maybe call Hobby King and tell them what you're doing. Good Luck!
Here's a link to a YouTube video showing electric planes in action:
The orange plane has an AXI 4120/18 motor/515 kV/75 amp ESC/6S Lipo.

xXsnipedoggyXx

thank you for your help, I do have an idea what I'm going to use, I don't really want to order from hobby king because of the exchange with Canadian and US dollar, and the shipping, im found a motor on eBay that's 850 kV and a 60 amp ESC I'm prob gonna go ahead and order those, the plane is actually 740 grams idk if that's right but.

DGrant

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Just be aware Mr. snipedoggy that electric props can bite just as hard or harder then nitro props. Whenever you're working on any electric plane, remove the prop... always. Whatever little accident you had with a nitro I'm sorry to hear about... but I just want you to know that electrics can be just as bad or worse if you're not careful. A runaway prop on an electric plane can be harder to shut off then a nitro... in any case either one deserves great care in using. I hope your plane works out... Good luck with it all.

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