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December 12, 2017, 14:21:44 PM

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Author Topic: 1st electric model  (Read 474 times)

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Offline British Victory

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1st electric model
« on: November 18, 2017, 23:12:56 PM »
I have a vintage model that I've electrified. It has a really short nose and whipping out the 4 stroke and putting in the electric motor has required loadsa lead.
I want to fit a battery for the rx up front (the flight battery can't intrude because of all the lead and the substantial firewall)
I realise that the in built bec on the speed controller normally supplies the power but I want the useful ballast and also the peace of mind that the extra battery provides.
To stop the esc from providing power is it simply a matter of snipping the positive lead from the esc or is it more complex than that?
there's only one f in RCMF,
               John


Offline Terry Clarke

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Re: 1st electric model
« Reply #1 on: November 19, 2017, 00:41:24 AM »
Don't snip it, just lift the tab in the connector and pull it out and tape it back. You can put it back in then if you need to in the future.

Offline British Victory

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Re: 1st electric model
« Reply #2 on: November 19, 2017, 09:59:25 AM »
Thanks, Terry.
I have to say that method is fraught with problems, the memory of the plastic isn't that good and, in the past, I've experienced problems where the pin in the rx doesn't make proper contact with the connector, when reverting after using the servo on retracts, pushing it back through the plastic.
It's safer, imho, to solder the two cut ends back together.
there's only one f in RCMF,
               John


Offline rogerandout

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Re: 1st electric model
« Reply #3 on: November 19, 2017, 13:22:02 PM »
If you must cut the lead then do it on an extension lead that's cheaper.

Offline British Victory

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Re: 1st electric model
« Reply #4 on: November 19, 2017, 14:13:36 PM »
Thanks RAO, never thought of doing that but, as you are probably aware, there are areas that are strapped for space in some models.
there's only one f in RCMF,
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Offline e-flite_rules

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Re: 1st electric model
« Reply #5 on: November 19, 2017, 16:51:08 PM »
Also consider putting in a bigger motor. For a given output power the larger motor will usually be more efficient.

Offline British Victory

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Re: 1st electric model
« Reply #6 on: November 19, 2017, 20:31:10 PM »
Also consider putting in a bigger motor. For a given output power the larger motor will usually be more efficient.
TBH on this plane I'm thinking about reverting to glow engines. Battery power hasn't quite scratched the itch.
We'll see.
there's only one f in RCMF,
               John

Offline quorneng

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Re: 1st electric model
« Reply #7 on: November 30, 2017, 00:47:05 AM »
British Victory
"Loads of lead" is a very poor solution in any plane and in electric even more so as there is already a heavy battery than can be used instead..
Given your problems of moving the battery forward a bigger motor is probably the next best solution.
A big advantage of electric is that, apart from being infinity throttleable, it can give really high power for short bursts which is what a bigger motor will allow.
The result is never identical to IC, its simply different.

 

Offline British Victory

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Re: 1st electric model
« Reply #8 on: November 30, 2017, 09:49:17 AM »
Larger motor = larger esc = more cost. I have two os 40 surpass sitting there doing nothing plus several suitable tanks what's there to decide?
there's only one f in RCMF,
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