Lydd Model Flying Club. Kents Best.

The Lydd Model Flyers are a BMFA Registered Model Aero Club on the Romney Marsh, UK.
 
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 retracts

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Gricer

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Number of posts : 214
Age : 56
Location : New romney
Registration date : 2012-01-23

PostSubject: retracts   Fri 15 Mar 2013, 8:47 pm

after chatting to Paul he suggested that I use seperate batteries for the flight controls & retracts,
Paul couldn't remember how to do it, so if anyone can help I would be v,happy.
ps please remember I need electrickery instructions in simple terms!affraid
Ta muchly:D
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TheHobman
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Number of posts : 289
Age : 44
Location : Ashford
Registration date : 2012-01-30

PostSubject: Re: retracts   Fri 15 Mar 2013, 8:56 pm

SM SERVICES do an auxiliary battery unit for 6.95, the same one that was used in the big thunderbolt. No trickery involved just plug it in and your done...
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Gricer

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Number of posts : 214
Age : 56
Location : New romney
Registration date : 2012-01-23

PostSubject: retracts   Fri 15 Mar 2013, 10:03 pm

cheers Steve ill look for 1 of those
many thanks
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Nobby
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PostSubject: Re: retracts   Sat 16 Mar 2013, 8:18 am

This forums the nuts!
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Worzey

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PostSubject: Re: retracts   Sat 16 Mar 2013, 8:49 am

It all really depends on the internal resistance of the power supply you intend to use and the type of load that will be connected to it.
To simplify it, you can can utilise Ohm's Law to give you the required values: So, to work out the current draw (I) take the nominal supply voltage (V) and divide it by the resistance of your load (R), thus I=V/R

Failing that, go to SM Services Laughing
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grounded

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PostSubject: Re: retracts   Sat 16 Mar 2013, 11:58 am

Keith,

Cut through and tape up the +ive lead on the foot of a standard Y lead

Then

From the retract battery to a standard switch harness to the modified Y lead to the retract channel on the Rx.

From the other leg of the Y to the retract servo.

What you are doing then is powering the servo from the seperate battery (JUST MAKE SURE THAT YOU MODIFY THE Y LEAD BEFORE YOU PLUG IT ALL IN) affraid affraid

All the other channels and flight battery are connected as standard.

Try it all on the bench first. You'll see that if you unplug the retact battery to simulate a dead one, all the flight controls still work.


If you still have it have a look at the wiring on the twin mustang, piece of cake Bravo

It has to be a Y lead, it wont work with the block type leads where both servos go into a block


Hope that helps

Bravo Bravo

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PostSubject: Re: retracts   Sat 16 Mar 2013, 1:02 pm

Well done Dave saved me the time typing it out. I have used it many a time works just fine. Bravo
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Worzey

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PostSubject: Re: retracts   Sat 16 Mar 2013, 3:55 pm

Keith
What plane are you putting the retracts in and how many servos drive the retracts?
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Gricer

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Age : 56
Location : New romney
Registration date : 2012-01-23

PostSubject: retracts   Sat 16 Mar 2013, 7:07 pm

Hi all
its going in the pink spitfire with 1 retract servo
thanks for the technical advice:affraid:
I think ill use steves suggestion & go so s&m services
I tried daves method & got a scarf!!!!!!!!!!!
& ohms law is like murphys to me!
Oh tried SM services & got the right devices-Phew! (its not S&M)
cheers!
ps still got twin mustang!
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Worzey

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PostSubject: Re: retracts   Sat 16 Mar 2013, 10:14 pm

If your using one servo to drive both retract legs, just come straight off the receiver. Why complicate it?
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Gricer

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Number of posts : 214
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Location : New romney
Registration date : 2012-01-23

PostSubject: retracts   Sun 17 Mar 2013, 9:30 am

Hi Ian
it was just to avoid flattening the flight battery,
perhaps a bit belt & braces, but the harness from sm is only 6 so better than a flyaway!
so thought I would try it!cheers
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