Engine Control Securing on the Fuselage Side

Discussion in 'Pitts' started by dylanxpeters, Jan 15, 2018.

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  1. Jan 15, 2018 #1

    dylanxpeters

    dylanxpeters

    dylanxpeters

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    Gentleman,

    My early, short fuse S-1C has a quadrant style mixture & throttle control on the side of the cockpit. A bracket was welded in and the quadrant is installed permanently.

    I'm having trouble devising a solid, safe, and clean way to secure the controls on the fuselage side. I've made brackets for the engine side which all is good. I'm using A-920 ACS controls with 10/32 threaded ends, and clevis forks for the cockpit side.

    I've attempted just clamping to the tubes, which did not work.

    I've attempted building a a riveted box, clamping it to the fuselage tubes, and securing the controls to said box, which almost worked, but is still not tight enough.

    I currently don't have access to an acceptable welder to install a steel bracket in, so i've considered instead using vernier controls right into the instrument panel.

    Any suggestions? Anyone else have quadrant style controls in their pitts?
     
  2. Jan 15, 2018 #2

    Dennis Flamini

    Dennis Flamini

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    Dylan,
    i would first find a biplane builder near you to weld a fitting on.
    If no help nearby you could Adel clamp an aluminum angle between the vertical tube near the panel and the diagonal tube forward of it and drill it for your clamp hold down.
     
  3. Jan 15, 2018 #3

    Dave Baxter

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    Dylan here is what I did, instead of weld on tabs like this, you could use adel clamps. Granted it is for the front throttle quadrant, but should be much the same. Dave

    DSC10024 small.jpg
     
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  4. Jan 15, 2018 #4

    PittsDriver68

    PittsDriver68

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    That looks like a good setup.

    Adel clamps - the rubber cushion permits movement, especially if any lubricants get onto them. You want AN742 Plain Clamps.

    Another option is the fabricated clamp used to secure a lot of control to the sump of Lycomings. It looks like a cube of aluminum with a hole drilled through, off center, for the control. The hole is the same size as the control. A thin saw cut is from one edge to the hole aligned with the long axis of the hole. Perpendicular to that, through the saw cut, is a hole drilled for an AN3 bolt. Tightening the bolt pulls the saw cut closed and firmly squeezes the control's sleeve. I hope this description paints the desired picture. If not, look at how the throttle control is secured to the sump of a Lyco that has a front mounted fuel control. That sort of clamping arrangement could secure the quadrant end of a throttle control.

    Best of luck,

    Wes
     
    Last edited: Jan 15, 2018
  5. Jan 15, 2018 #5

    cwilliamrose

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    The factory uses UMPCO clamps for that purpose on the S-2 airplanes. They do not slip and they are as good as a welded tab in rigidity but are easy to tweak for position. This is the mixture control bracket/clamp on my S-2A;

    DSCN3954a.JPG

    DSCN3955a.JPG

    The bad news is they do not appear in UMPCO's catalog. I'd like to have some in various sizes so I'll see what they can tell me using the part number on the clamp. The plate welded to the clamp is the way the factory does it. I changed this one because I'm relocating the mixture control -- I cut the welds and then welded the plate on at a different angle. This small welding job could easily be done off-site which is how I did this one.
     
  6. Jan 15, 2018 #6

    Ralsmark

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    Hi Dylan,

    I think you are referring to a method of securing the push-pull cable housing forward of the quadrant, yes? The pics here show a bracket I made from 1/16 inch thick aluminum extruded angle and some ,063 2024-T3 aluminum plate. The installed bracket is at the left shoulder portion of the fuselage photo. Sorry I don't have a closer view of the installed bracket. The bracket is secured to the tube structure using two adel clamps. The standoff plate provides offset to make it align with the control handle. A notched U-clamp secures the cable housing to the plate. I found this held pretty securely with good stiffness.

    Mark

    IMG_2713.jpg

    IMG_2729.jpg
     
    Last edited: Jan 15, 2018
  7. Jan 15, 2018 #7

    cwilliamrose

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  8. Jan 15, 2018 #8

    Morphewb

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    Bill,

    I got a quote from them about 10 years ago. I wanted 10's and other Pitts sizes. 18 bucks a piece with a minimum of 12. Guess Curtis was buying them by the bucket when they were WW2 surplus. I got almost the same price from Aviat back then too but obviously no minimum required.

    Hope they are more reasonable now but I doubt it.
     
  9. Jan 16, 2018 #9

    cwilliamrose

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    I asked the sales guy who might have these in stock and he told me Aviat had bought several sizes in separate orders during the last year, apparently they are the only recent customers. I also asked about minimum quantity and he said some sizes are 1 pc, other sizes are more pcs. I should have asked him about where the price breaks were, I guess that will be a question to be asked after I get the quote. I'm not expecting anything good from the quote.
     
    Last edited: Jan 16, 2018
  10. Jan 16, 2018 #10

    PittsDriver68

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    Give Janette at Aviat a call to check and compare pricing. You never know. The part number in the S-2A Parts Book is 2126-001 (left side) and 2126-002 (right side).

    Best of luck,

    Wes
     
  11. Jan 16, 2018 #11

    cwilliamrose

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    Wes, I think those part numbers refer to the bracket assemblies of which the UMPCO clamp is one part. For general purposes the clamps alone are what we want. Those clamps are used alone (not as part of a weldment) for the trim handle stops on the S-1S and maybe some other places. I think Aviat's price might be a good thing to know, I'll contact her and let everyone know how much they like these clamps.......
     
  12. Jan 16, 2018 #12

    dylanxpeters

    dylanxpeters

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    Thanks for all of your replies, guys. Before I toss my ideas out and bring my airplane back to Dennis Sawyer for a welded bracket, I’m going to see if I can get a strong attachment from an aluminum angle peice and AN742 plain clamps, by using ACS control mounts p/n 10464.
     
  13. Jan 16, 2018 #13

    tdwrv8

    tdwrv8

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    West marine has the clamp style brackets for $2.00 each
     
  14. Jan 16, 2018 #14

    cwilliamrose

    cwilliamrose

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    Do you have a link to those? I looked around on the West Marine site and didn't see them.
     
  15. Jan 16, 2018 #15

    bneub

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    I may be interested in a few as well. 3/4, 7/8, & 1”.
     
  16. Jan 16, 2018 #16

    cwilliamrose

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    I didn't ask them to quote 1" but we should know from the other sizes they quote if this makes sense or not.
     
  17. Jan 16, 2018 #17

    garyg

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    Not sure if this is the same but this is what I did for the throttle cable. It is a A-920 cable so it has the grove for the clamp. I am sure a quadrant where there are several cables makes the task much more daunting.

    IMG_1494.jpg
     
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  18. Jan 16, 2018 #18

    Morphewb

    Morphewb

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    Bill,

    I'll spring for some clamps too if they don't go apesh!t on the prices. I've got so much stuff I'll never use now a few clamps won't make much difference.

    Ben
     
  19. Jan 16, 2018 #19

    cwilliamrose

    cwilliamrose

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    I just got this from Janette at Aviat. Not too bad pricing except for the -8 & -14;

    ==============
    The following is the information requested.

    60848 (size 8) $51.27 each Have 21 in stock
    60850 (size 10) $5.00 each Have 231 in stock
    60852 (size 12) $3.40 each Have 332 in stock
    60854 (size 14) $20.08 each Have 11 in stock
    60856 (size 16) $3.10 each Have 13 in stock

    Prices are good for 30 days only and do not include shipping cost.
    ==================


    I'm doubtful UMPCO will do better on most of these sizes.
     
  20. Jan 16, 2018 #20

    garyg

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