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Electrifying 5th Scale Glider

Fans and Thermals.
Mick Tomlin
Posts: 35
Joined: 18 Mar 2015, 10:22
Location: East Sussex

Electrifying 5th Scale Glider

Post by Mick Tomlin »

I am going to electrify a 5th scale glider 3mt span '@ approx. 2.75 kg.
Some guidance size of motor and battery would be appreciated.
This is my first attempt so any help would be welcome.

Mick
Barry_Cole

Re: Electrifying 5th Scale Glider

Post by Barry_Cole »

Mick,
At 80 watts/Lb, you need about 480Watts, so one of these and a 3S battery should do the job.

https://www.overlander.co.uk/rc-motors/ ... motor.html

Hope that helps.

BC
Mick Tomlin
Posts: 35
Joined: 18 Mar 2015, 10:22
Location: East Sussex

Re: Electrifying 5th Scale Glider

Post by Mick Tomlin »

Thank you Barry for speedy and helpful responce.
User avatar
Peter Balcombe
Posts: 1399
Joined: 18 Mar 2015, 10:13
Location: Clevedon, North Somerset, U.K.

Re: Electrifying 5th Scale Glider

Post by Peter Balcombe »

Barry,
The specification for the motor via the Overlander link doesn’t make sense to me!
It’s specified as a 442W max power motor & supposedly capable of 50A max (suspect that might be 10s burst only), but with a 3S pack, you will be pulling nearly 40A to get max power.
The recommended ESC is only 30A, so that normally means staying below say 25A to avoid letting the magic smoke out!
Current draw is lower for a 4S pack to get the same power, but still around 30A for 450W or so.
I find that it’s usually the case that you can only get max specified power at max cell count in order to stay within the
max motor current limit. (You usually cannot have everything at the same time☹️)
Personally, I would opt for a slightly higher power motor, particularly if running on a 3S pack, but note that the ESC needs to be adequately sized for the higher current required at lower volts.

My tuppence for what it’s worth.
Peter
Barry_Cole

Re: Electrifying 5th Scale Glider

Post by Barry_Cole »

Yes Peter, having looked again you are right. I slightly bigger motor would be better, although from experience 80W/lb is well on the high side.

:oops: :oops: :oops: :oops:

BC
Mick Tomlin
Posts: 35
Joined: 18 Mar 2015, 10:22
Location: East Sussex

Re: Electrifying 5th Scale Glider

Post by Mick Tomlin »

Hi Barry and Peter
I have ordered the recommended motor along with a 40anp ESC
I this going to be suitable or should I reorder bearing in mind I am not looking for tearaway performance from my first efforts.

Mick
User avatar
Peter Balcombe
Posts: 1399
Joined: 18 Mar 2015, 10:13
Location: Clevedon, North Somerset, U.K.

Re: Electrifying 5th Scale Glider

Post by Peter Balcombe »

Mick,
You should be ok with a 40A ESC as long as you use a wattmeter to check current draw & make sure you don’t push the ESC over its limit. It’s usually a good idea to leave a bit in hand, so I would aim for say 35A max.
With a 3S LiPo (say 12v) then that should give you 420W, which should be enough.
You will possibly have to tweak the propellor size/pitch to optimise power whilst not stressing the ESC.
(Note that you can always limit the throttle travel to limit max power if a chosen prop takes a bit too much power).
Mick Tomlin
Posts: 35
Joined: 18 Mar 2015, 10:22
Location: East Sussex

Re: Electrifying 5th Scale Glider

Post by Mick Tomlin »

Thanks you Peter for the sound advise
Will probably need more guidance as I progress

Mick
SP250

Re: Electrifying 5th Scale Glider

Post by SP250 »

Mick

If you need more help fire me a PM with your email/phone no.
E Calc can work all the specs out and prop sizes before you spend the money and buy the wrong thing.

John M
Mick Tomlin
Posts: 35
Joined: 18 Mar 2015, 10:22
Location: East Sussex

Re: Electrifying 5th Scale Glider

Post by Mick Tomlin »

Hi John
Thank you for the offer and I will if needed

Mick
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