Yoke PTT with PC advice

[jamesm]

I have 67'C with Velcro PTT  switch on the yoke and also  has PC (Positive Control) button. So I was thinking of attaching a push button for the PTT  inboard of the left thumb PC Button and running the wires outside of left vertical upright  until it comes to base of the yoke. I was think of drilling small hole through the yoke to bring the wires inside  yoke center section and then route the wires down the center of the  control shaft along with the wiring for  light yoke clock and flex tubing for the PC valve button. I have heard stories were someone drill holes in the hitting tube(s) going to left thumb PC Button make PC inoperative.

I was little apprehensive  of drilling holes in the yoke sense I am not sure what material of the yoke is made of  or how the yoke is made.

drilling holes in sintered metal (if the yoke is made of the material)  I am  a little  paranoid of having the yoke fracture and making it usable even know the hole(s)  would very small probably #30 for the wires.

I am looking for suggestions/comments   for PTT  switch mounting  ,more of permanent  solution, while  keeping the PC button on the yoke operative. Pictures would be great if available.

 

Thanks in advance,

James '67C

 

Edited January 21, 2016 by jamesm

[Hank]

Here's how mine is done. The wire goes inside the shaft. If you want photos of the back,  I can take some tomorrow.

the copilot yoke PTT button is done similarly, but the wire is on the outside.

[takair]

fMine runs outside.  Not as great looking, but it has held up for years.

 

[Marauder]

Is the retrofit kit available for you guys? I had to contend with the mongo yokes on my 1975. Mooney produced kits at one time that allowed the modern yokes to be used. Replaced the shafts and the yokes. The newer style makes it very easy to add accessories to the yoke.

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[RLCarter]

Below is what I used, allows PTT with your index finger leaving your thumb free to use the PC disable at the same time. Held on with Velcro and doesn't bother my grip of the yoke. 

[takair]

9 hours ago, RLCarter said:

Below is what I used, allows PTT with your index finger leaving your thumb free to use the PC disable at the same time. Held on with Velcro and doesn't bother my grip of the yoke. 

Did you do the leather work?  Does the wire run under the leather?  It would be cool if the switch and wire could be worked into the leather cover.

 

[takair]

10 hours ago, Marauder said:

 

Is the retrofit kit available for you guys? I had to contend with the mongo yokes on my 1975. Mooney produced kits at one time that allowed the modern yokes to be used. Replaced the shafts and the yokes. The newer style makes it very easy to add accessories to the yoke.

Sent from my iPad using Tapatalk

Not aware of a kit.  The problem with these is that there are hard and soft pneumatic lines in the yoke.  Some go to the cut-off and some to the trim knob.  I'm pretty sure the cut-off bore is part of the yoke.  You could come up with an alternative, but it would get into the grey area on certification....or require certification...

correction...I now see that by 1970, Hank's trim knob moved to the T&B....so one less thing to move.

[Guest]

I managed to fish the PTT wires through the lines in the yoke, then found a PTT switch which fit in the hole for the disconnect button.

Clarence

[RLCarter]

Takair,

leather was done done by a local HotRod shop, I had the wires taped to the yokes then made all the connections when I got the back, seems to work ok so far

 

 

[HRM]

There was a hole drilled behind the clock in my yoke--don't ask me how it got there. No, it was not my hangar elves. 

My elves did fashion a neat S-shaped aluminum tube that they pushed into a piece of threaded lamp pipe that they affixed to the hole with nuts and washers. 

They covered the metal tube with heat-shrink tubing and then press-fit a PTT button from a J into the end.

Works great and I kept my PC button!

IA just shook his head and made a few 'tsk' sounds.

 

[jamesm]

Thanks for the pictures  this gives me good ideas.

Is the original yoke material drillable ?  

I see a bunch of hair line fractures in the original finish I hoping to put a small hole in the back side where it would be less visible.  

Another question  Does any body happen to know  what is behind  the "Mooney logo " on the front passenger yoke? Is it hollow?

I have still have the clock and PC still work and  want them in tact they still are in working condition.

Thanks again.

James '67C

 

[Hank]

The right yoke isn't hollow. Pictures to follow . . .

[Browncbr1]

brittain makes a plunger valve that you can use instead of the button on the yoke.  disconnect the latex tub from the yoke shaft under the panel and reroute to the plunger, which would be mounted somewhere on your panel that can fit about a 1/4" hole.   Then pull the button out of the yoke and run your wire through it all the way down to where the latex tube was disconnected... use a momentary switch that fits in the hole..

[TWinter]

Aero Comfort will cover them in leather and sew a PTT in the leather so there is a small switch. Kind of $, but is very convenient and came out nice. Kind of a crappy picture, but here is my co-pilot side. Actually there was a larger head on the right side, but it has managed to come off. Since I never have a pilot in the other seat I just left it off, but you can see the small tip at the top.

[HRM]

20 hours ago, jamesm said:

Thanks for the pictures  this gives me good ideas.

Is the original yoke material drillable ?  

Yes, but the yoke appears to be sintered metal so proceed cautiously. Like I said, mine already had a hole.

20 hours ago, jamesm said:

I see a bunch of hair line fractures in the original finish I hoping to put a small hole in the back side where it would be less visible.  

Another question  Does any body happen to know  what is behind  the "Mooney logo " on the front passenger yoke? Is it hollow?

I have still have the clock and PC still work and  want them in tact they still are in working condition.

I was/am of the same mind. When I got my E the yoke clock didn't work. One day I discovered that the hangar elves had soaked it in clock oil (fine mineral) overnight. It has worked beautifully ever since. Few know that Wakmann used a Breitling mechanism for this clock! If truth be told, I just use it for quick reference and to time my fuel switchover with the handy red timing hands.

[jamesm]

I went a head and mounted it the PTT  switch a permanent solution  This is not  a Oshkosh award winning PTT installation but should have to flight PTT switch falling down all the time.

Now just waiting for  the weather to clear to go fly.

Thanks again for the picture and advice.

 

James '67C