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SERVO EXTENSIONS , Y-HARNESSES & MORE!
 

Heavy duty 22 gauge with universal gold plated plugs.
The best for giant scale aircraft.
 

Note on twisted extensions: If you are still using 72 or 50 MHz transmitters instead of the new 2.4 GHz or Spread Spektrum technology, twisted wires are suggested. If you are using the new technology, twisted wires offer no advantage to untwisted wires. Twisting extensions eliminates interference caused by stray signals being picked up by the signal wire in the old MHz systems. The wire can act like an antenna. This is rarely a problem, but if you have an intermittent interference problem this may be the cause. The signal wire (usually orange or white in color) has little current running through it. It tells the servo what position it needs to be at. The red and black wires have higher current in them as they provide power to the servo. Only the signal wire will pick up stray signals due to the low current. Twisting the wires in effect wraps the signal wire around the power wires which cancels out electrical noise. The noise is called electro-magnetic interference, abbreviated to "EMI". Typically extensions which are around 3' long cause more problems because they are the length of a receiver antenna, but extensions of any length near a gasoline (spark) engine ignition system can pick up EMI from the engine's ignition. DA, 3W, ZDZ, and other ignitions are now shielded so well that this is rarely a problem. Also, resistor sparkplugs are used which keep EMI down. For these reasons, we offer only twisted wires.

 

ACCESSORIES

 

 

TBM SERVO EXTENSION TESTING

TBM conducted its own servo extension testing using the equipment shown. We found that adding a single servo extension (22 gauge with universal connectors) between the Rx and the servo will cost you 1.5% - 5% of your power to that one servo. Adding another extension will cost you another 1.5% - 5% and so on. In one of the many tests run, I put ten 6"extensions in series and measured a total drop of 15% of the maximum torque that a single JR-8711 could put out. In another test, I put ten 48" extensions in series (40' of extensions) and found the drop in power to be 55%. Therefore losses due to servo extensions is a combination of plug losses and wire resistance losses.

POWER LOSSES IN SERVO EXTENSIONS
 

SERVO EXTENSION LENGTH EXPECTED TORQUE LOSS
6" 1.5%
12" 2%
18" 2.5%
24" 3%
36" 4%
48" 5%

WHAT'S THE BOTTOM LINE OF THE ABOVE TESTING?:
* With proper servo sizing, you will not experience any difficulties using extensions.
* Never use extensions between the battery and the Rx. If you need more length, splice in additional 18 gauge wire.
* Use the shortest length extensions possible.
* Use one long extension instead of 2 or more shorter ones.
 

SERVO EXTENSIONS & Ys

 

All extensions are twisted.

Note: these extensions have JR male ends and Futaba female ends so that either JR of Futaba extensions or servos can be connected without problem.

 
SERVO EXTENSION SIZE

 

3" extension / pair

Part# TBMw.25

$6.49/pair  IN STOCK

Quantity:

6" extension / pair

Part# TBMw.5

$6.98/pair  IN STOCK

Quantity:

12" extension/ pair

Part# TBMw1

$6.98/pair   IN STOCK

Quantity:

18" extension/ pair

Part# TBMw1.5

$7.98/pair  IN STOCK

Quantity:

24" extension/ pair

Part# TBMw2

$7.98/pair  IN STOCK

Quantity:

36" extension/pair

Part# TBMw3

 $8.98/pair  IN STOCK
Quantity:

48" extension/pair

Part# TBMw4

 $9.98/pair  IN STOCK
Quantity:

Y-harness - each

Part# TBMwy

 $5.95 IN STOCK
Quantity:

Expert Y harness - each

Part# EXPyrev

With servo reverser JR/Universal connector- Heavy duty- Untwisted

 $8.95 IN STOCK
Quantity:

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DO-IT-YOURSELF

 

MPI Wire
10' of 22 ga servo 3715 MPI wire

To reduce current loss, it is best to use as few connectors as possible and keep the wire lengths short. While making your own extensions is the best way, I really don't like making extensions using this method, it's too hard to get the wire in the plug and crimp it, but, it does work. If you like things really neat looking, this is the way to go. For me, I prefer to use regular extensions and just cut the plugs off and then solder them together, or just get extensions which are too long and then cut some out of the middle to get them the right length. This way I am just dealing with soldering wires instead of crimping plugs. 

                                    Part# MPIwire

$5.50 IN STOCK

Quantity:
 

JR Female plugs - bulk pack of 10

Part# AIRplugsFjr

$13.55 IN STOCK

Quantity:

JR Male plugs - bulk pack of 10

Part# AIRplugsMjr

$9.95 IN STOCK

Quantity:

 
Crimping Tool

Part# CEcrimper  

$20.95 IN STOCK

Quantity:

 
 

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CONNECTORS

 

 

 

       Deans Ultra Plug Male/Female 

  The Industry standard in high performance connectors The Ultra plug actually has less resistance, including the solder joints, than an equivalent length piece of 12 gauge wire.

Key Features

        * Capable of 60 Continuous amps
        * Protected to avoid shorting and reverse polarity
        * Superior technology suited to today's advanced applications
        * Designed with convenience and reliability in mind
 

Part# DUlt

$3.25 pair  IN STOCK

Quantity:
 

 

JRec3male

 

 

 

JRec3female

EC3 Connectors

EC3 Device connectors are the ideal power connector for devices such as speed controls, battery chargers, and power meters and connects to the EC3 Battery Connector used on power output leads on batteries such as the Spektrum Nimh part# JR1650. E-Flite's high-quality EC3 connectors and leads should be a staple for every workbench.  EC3 connectors, leads with connectors, and accessories are perfect for electric power applications

 Key Features

        * Capable of 60 Continuous amps
        * Ergonomically pleasing and easy to grip
        * Protected to avoid shorting and reverse polarity
        * Superior technology suited to today's advanced applications
        * Designed with convenience and reliability in mind
       

 

 

EC3 Device Connector:
One piece per package
 Part# JRec3male

IN STOCK $2.99

Quantity:
 

 

EC3 Device Connector:
One piece per package
Part# JRec3female

IN  STOCK $2.99

Quantity:
 

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TROY BUILT MODELS
1650 Honore Ave.- Sarasota, FL 34232
941-342-8685

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