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Old Sep 21, 2013, 04:26 PM
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BillzillaAus's Avatar
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Using small electric motors as brakes

Sorry I haven't done a search but how hard would it be to put small electric motors into the wheels (I'm planning on building an EDF 747) to use them as generators help it stop?
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Old Sep 23, 2013, 07:29 AM
Plane crasher
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what you mean exactly?
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Old Sep 23, 2013, 07:48 AM
Dave Segal
Philadelphia PA USA
Joined Jun 2001
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He probably means dynamic braking which is common in electric powered vehicles such as commuter trains and subways. It has to be used in conjunction with mechanical braking systems as the effectiveness of dynamic braking diminishes with lower rpm.
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Last edited by Dsegal; Sep 23, 2013 at 08:12 AM. Reason: Additional information
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Old Sep 23, 2013, 07:56 AM
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Canada, ON, Ottawa
Joined Oct 2010
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He is talking about regenerative braking.

The size of motors needed to make it effective and complexity of circuitry to put the power back into the battery would most likely make it unfeasible in a model airplane.
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Old Sep 23, 2013, 08:20 AM
Dave Segal
Philadelphia PA USA
Joined Jun 2001
547 Posts
The systems used on rail vehicles are dynamic, not regenerative, as the energy is not stored for later use but sent to heating grids which dissipate the energy to the air. There would be no sense in trying to store the energy from a model plane's wheels.

Going back to 1/24 scale slot racing cars in the 1960s, the dynamic braking circuitry was very simple, just a matter of shorting out the motors. But I can't see this working on a flying model.
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Old Oct 19, 2013, 12:39 PM
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Quote:
Originally Posted by BillzillaAus View Post
Sorry I haven't done a search but how hard would it be to put small electric motors into the wheels (I'm planning on building an EDF 747) to use them as generators help it stop?
Just a thought but why not put in thrust reversers on each engine just like 747.

Not sure if that would be enough reverse thrust without brakes but might be really cool.

Keith
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Old Oct 19, 2013, 12:44 PM
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Just a thought

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Old Oct 20, 2013, 01:48 AM
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BillzillaAus's Avatar
Australia, QLD, Worongary
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Originally Posted by kknox View Post
Just a thought but why not put in thrust reversers on each engine just like 747.

Not sure if that would be enough reverse thrust without brakes but might be really cool.

Keith
Quite difficult to do and keep it light & reliable. There's a good thread on reversers in one of the sub-forums.
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Old Oct 20, 2013, 07:53 AM
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South Wales U.K.
Joined Mar 2003
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I would guess you only need one each side, or maybe just the nose wheel(s).

How about these commercial ones, a little pricey but a lot easier than trying to make some --

http://www.hobbyking.com/hobbyking/s...dProduct=23470
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Old Oct 20, 2013, 07:56 AM
An itch?. Scratch build.
eflightray's Avatar
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Simple homemade one, but doesn't look pretty for a scale model, but if hidden on the inner wheels .......

front wheel braking system for rc plane (0 min 29 sec)
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Old Oct 20, 2013, 07:59 AM
An itch?. Scratch build.
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A Google Images seach on RC plane wheel brakes --

https://www.google.com/search?q=rc+p...&bih=655&dpr=1
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Old Dec 07, 2013, 10:12 PM
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BillzillaAus you have an awesome idea. In fact there is no reason that such a braking system couldn't have an "anti-lock" function worked in. Also the motors could be used to power the wheels on take off too!

Paul
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Old Dec 09, 2013, 03:19 PM
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Originally Posted by Paul5910 View Post
BillzillaAus you have an awesome idea. In fact there is no reason that such a braking system couldn't have an "anti-lock" function worked in. Also the motors could be used to power the wheels on take off too!

Paul
I can't claim credit for it, a friend of mine on another forum got me to use my 3D printer to make a set of wheels for him, and they were going to hold small electric motors for brakes.
So this thread was mainly to see if anyone here had done it before and if so how well it worked.
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Old Dec 10, 2013, 04:07 AM
An itch?. Scratch build.
eflightray's Avatar
South Wales U.K.
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Don't forget to post the results of the 'motor as a brake' testing.

If it works I will be very surprised.

And I generally like surprises.
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