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Joining servo leads

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Darran29/04/2017 20:31:27
236 forum posts
72 photos

Hi

I foolishly brought a Durafly BF110 kit, and I am trying to assemble it. I am sure for some of you out there this is a fairly simple assembly, but I have found it much more difficult than I expected.

I have been following a few build threads on here and another forum to try and assemble the model.

I have a couple of questions, the first is that in the tail there are two servos driving the rudders, but there is a third servo to drive the tail wheel which is in the fus. Normally the tail wheel would be connected to the rudder. This sounds stupid I know but does this mean I need to join all three servos together and connect to one receiver port.

Secondly, the servo wires for the rudder come together right on the joining point to the fus, I cannot use connectors here as there is no room, the only option I think I have is to splice an extension on to them.

Given that the two questions relate to the same circuit, is it a better option to create a harness to join the three servos together, especially as space in this model is tight.

Edited By Darran on 29/04/2017 20:31:52

Edited By Darran on 29/04/2017 20:32:17

Hamish29/04/2017 21:17:56
642 forum posts
47 photos

Are you sure you mean rudders? Suggest it could be split elevator.

The third servo would be to operate the rudder.

Each servo will connect to Rx in separate ports. (Advice from expert as elevator servos can be power from one port with a Y lead )

Edited By Hamish on 29/04/2017 21:20:40

Percy Verance29/04/2017 21:23:49
avatar
8109 forum posts
155 photos

Hamish, don't forget it's an Me110, which means there are two rudders. One on each end of the tailplane............

Darran29/04/2017 21:25:52
236 forum posts
72 photos

Posted by Hamish on 29/04/2017 21:17:56:

Are you sure you mean rudders? Suggest it could be split elevator.

The third servo would be to operate the rudder.

Each servo will connect to Rx in separate ports. (Advice from expert as elevator servos can be power from one port with a Y lead )

Edited By Hamish on 29/04/2017 21:20:40

Yes I mean rudders, the Bf110 has two of them.

The elevator is controlled from a seperate servo with a linkage that looks like a tuning fork.

ChrisB29/04/2017 21:27:07
1219 forum posts
34 photos

Y lead the rudders then mix the tail wheel channel in with the Y lead rudder channel.

Hamish29/04/2017 21:27:28
642 forum posts
47 photos

Thanks Percy as I could not find specific model. Same suggestion of a Y lead would still stand?

Darran29/04/2017 21:34:48
236 forum posts
72 photos

Thanks guys, that makes more sense.

What are your thoughts on splicing extensions on the servo leads to get round the tail joining obstruction.

Hamish29/04/2017 21:37:14
642 forum posts
47 photos

No problem splicing. Have you soldered before? 

Edit.  Would use heat shrink at joint.

Edited By Hamish on 29/04/2017 21:40:08

Tim A29/04/2017 22:38:55
215 forum posts
11 photos

The tailwheel servo is connected to the two rudder servos by a three way servo lead. W? lead? However on one flight with it after a nice take off & left turn in circuit it sailed on with no response! Found undamaged hanging on a fence by its props after glancing off the tree line - no damage everything seemed to work. Back in the pits found tailwheel no go. Left sitting with power on while checking over, smoke started to appear from rear of fuse. Turns out tailwheel servo had seized & shorted. Causing it to go into failsafe. So cut servo wiring to tailwheel, centred wheel and flew without.

Found takeoffs & landings were better without it, so unless you have a sealed runway (ours is v. short grass) I wouldn't bother with tailwheel control. Rudder control is good on takeoff & the tail lifts quickly anyway making tailwheel superfluous.

Darran29/04/2017 23:30:38
236 forum posts
72 photos

Maybe fixing the tail wheel is a viable option, on this model would certainly make the limited space problem easier. When fun is joined together then space and access to the tail wheel servo is very limited.

 

Edited By Darran on 29/04/2017 23:31:54

Edited By Darran on 29/04/2017 23:33:29

Jonathan M30/04/2017 08:45:23
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669 forum posts
275 photos

Or, rather than fix the tail-wheel, let it rotate freely within a limited arc? That way you'll have more rudder authority when taxiing.

Peter Miller30/04/2017 09:42:11
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10067 forum posts
1192 photos
10 articles

Tip for joining wires when making up leads.

Slide heat shrink up one wire on each joint (obvioius)

Make a groove in a piece of balsa the same size as the wire. Hold the two pieces of wire together in the groove with pins. Apply solder to the joint. The groove keeps the solder the same size as the wires and makes a neat joint/ Repeat for all three wires.

mightypeesh30/04/2017 10:15:38
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679 forum posts
892 photos

Top tip on the grooved balsa Peter, I will try that next time thumbs up Cheers, Simon

Tim A30/04/2017 11:48:53
215 forum posts
11 photos

The other thing to do with DF BF110 is throw the supplied props away and fit Master Airscrew 9X6 three blade props. The HK ones are hopelessly out of balance and will shake the motors off their mountings! They will fit the existing adaptors and spinners with only a little modification.

Simon Chaddock30/04/2017 16:47:54
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5416 forum posts
2831 photos

Splicing servo leads?

If you are a dedicated lightweight flyer you always splice them if only to save the weight of the connectors! In addition a good soldered joint is physically more reliable and with a lower electrical resistance than a connector.wink 2

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