SH Rotor Tach harness

[Colin Gibson]

Is there anyone who can help me.
My Rotor Tach harness wire frayed the insulation at all the points I attatched it down the mast. I have sourced another harness from amptronic in south Africa. It is the same as my original one with soft insulation of the cable. I have purchased five meters of clear plastic tube which I split from one end to the other and pushed the harness wire into it.
I will put some RTV on where the wire comes out of the sensor this time.
Now having gone to these lengths to make sure this repair will be durable I want to make sure I install it in the best possible way.
Could someone please send or post a picture or drawing showing where they routed their cable from the sensor on the mast to the base of the mast in the Sparrow Hawk I instalation.

:help:

[Timchick]

How was it attached the first time?

[Colin Gibson]

It was attatched on a bracket at the front of the mast where the control rods attatch. That is as per the assembly instructions.
This time I want to attatch it behind the mast, beside the pre rotator
I had'nt heard from anyone so went to the airport today to make a plan. Looks like I should be able to shorten the sensor bracket and mount it without to much trouble. Just need a couple of AN4-30A bolts to mount the bracket.
Have you seen one on another Sparow Hawk ?
How did it look ?

Colin

[Timchick]

I'm not familiar with the Sparrowhawk installation. On my single place KB-2 I had the wire for the rotor tach attached to the mast with some small adel clamps.

[Colin Gibson]

I have decided to remount the bracket behind the rotor head and run the cable down with the rotor brake cable.
Had a look at a RAF setup and it is better than I had.
Thanks for your help.
Colin

[Dirtydog]

Colin Gibson :
Might want to post it in the Sparow Hawk section or ask Steve.
http://www.rotaryforum.com/forum/forumdisplay.php?f=33

[Heather Poe]

I have purchased five meters of clear plastic tube which I split from one end to the other and pushed the harness wire into it.
Colin,
I personally found the wire to be too fine from the sensor on Randy Coplen's Sparrowhawk (I don't know if this was original), so I spliced on a thicker cable a few inches from the sensor. I used shrink wrap to make this cable even more stiffer and durable. I also used plastic tie wraps bind the sensor wire to the bracket, and to reduce movement of the cable near the sensor, and left a moderate size loop of extra wire between the mast and sensor to soak up movement.
Heather

[Colin Gibson]

Thanks Heather,
I are surprised they made that harness so light as they sell the DX 9 as a 'Rotor Tachometer' and therefore should be well aware of the movement in a rotor mast.
I will not be attempting to splice on a thicker cable but have gone with the option of encasing it in another tube and will be mounting it behind the rotor head this time.
Cheers
Colin

[Colin Gibson]

Colin Gibson :
Might want to post it in the Sparow Hawk section or ask Steve.
http://www.rotaryforum.com/forum/forumdisplay.php?f=33

The question was more in relation to finding different and better options to mounting the sensor and harness wire than the fact it was going on a Sparrow Hawk