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Front shoulder harness attach

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  • Front shoulder harness attach

    I need some help. I don't like the position of the of the factory front shoulder harness attach point (2017 fuselage build) due to risk of injury to the rear seat occupant in an accident.

    Photo one is me sitting down with my back on the rear cushion. The the attach point is about 6" form my skull.

    Photo two is the factory attach point without my ugly face influencing things.

    Photo 3 is my sad design fix...I thought maybe a cushion applied to my fitting would work. It looks pitiful. I'm not good and don't like design, and my design sticks down way too far. If it's too difficult to fit, the rear seat passenger will use have to wear a helmet during takeoff and landing. I bet I spent two or three days on this stupid thing.

    Photo 4 is what I have now and what is in Bob's Patrol (photos circa 2017).

    You can also see the rear seat shoulder harnesses are wrapped around a fuselage tube. I used a two bar slide like race cars use to wrap the straps around the tubing. I wish I would have thought to try to wrap the front should straps too around the bar that crosses the fuselage above the factory attach fitting.

    Is there anything anyone who has a good design fix? I'm past the point of welding anything. A bolt on fix would be nice.




    Screen Shot 2022-01-09 at 6.23.04 PM.pngScreen Shot 2022-01-09 at 6.23.18 PM.png

    Screen Shot 2022-01-09 at 6.23.29 PM.pngScreen Shot 2022-01-09 at 6.23.49 PM.png
    Brooks Cone
    Southeast Michigan
    Patrol #303, Kit build

  • #2
    Brooks-you could saw off that bracket and grind. Then trapp the rear diagonals with two 1/4” aluminum plates using a 1/4” bolt that’s vertical. Seat belt would be captured with same bolt.
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    • #3
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      • #4
        Current production Patrol & LSA kits have a vertical bushing welded into the front of that cluster. With a 5/16" ID. Mark

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        • #5
          EVERY time I have a design issue, I over think and over complicate it. I really like your simple fix, Paul. I've been looking at that thing for years, trying to come up with a solution. Now if I can grind it off with out melting holes in my fabric with sparks from the grinder.
          Brooks Cone
          Southeast Michigan
          Patrol #303, Kit build

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          • stinger
            stinger commented
            Editing a comment
            Br00ks, my harness mount is placed in the same position as Paul's . Stinger

        • #6
          I have a 4 Place, A model, that is yet to be finished. I struggled with the shoulder harness mounting points.

          My back ground is in auto racing, building and driving formula cars. I have been air born and upside down and even have the skid marks on my helmet where it contacted the track surface. So I am a bit anal about safety harness design.

          In a race car, I have the should harness mounted so that the straps are horizontal above the shoulders. When you go inverted, the harness does a good keeping you in the seat. In case of a hard frontal impact the harness does not place a downward pressure on the spine as it would if the mounting was below the shoulder. The issue I see and I could not satisfactorily solve was how to mount the shoulder harness low enough to provide proper restraint when inverted.

          My current thinking is to have a second shoulder harness that mounts under the seat and passes between the back of the seat and the pilot, over his shoulders and attaches to the shoulder harness where attaches to the lap belt. Another option might be to have the belts that pass between the seat back and the pilot have a loop that the shoulder harness passes through and this would retain the pilot in the seat when inverted..

          Just an idea. I am looking for suggestions or thoughts. I have done a short session in an aerobatic plan but I don't remember how the harness was rigged. I do remember that is worked great.

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          • #7
            The lap belt does the yeomen’s duty of keeping you in the seat, including when inverted. Aerobatic aircraft used in competition and airshows will have two lap belts with separate attach points. One of those belts will usually have a ratcheting tensioner. A shoulder harness can help restraint of the upper body in negative-g aerobatic maneuvers, but a shoulder harness in a GA aircraft is present to prevent uncontrolled forward, upper body movement. A lap belt should contact you low on the hips and as tight as you can comfortably make it while in motion.
            Last edited by Light&Sweet; 01-14-2022, 06:08 AM.

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