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  • Throttle Quadrant

    The original post had problems, so I cut/pasted and slightly improved it with good photo links in Post #4
    Last edited by Bcone1381; 08-20-2018, 09:16 AM.
    Brooks Cone
    Southeast Michigan
    Patrol #303, Kit build

  • #2
    I’m excited about your quadrant! But don’t see any pictures.
    Is it just me?

    Bill

    Comment


    • #3
      Nice write up, pity the pictures aren't coming through.

      Comment


      • #4
        Let me start over.

        http://baxterquadrants.com

        I got my Throttle Quadrant from the above company. My connection with Baxter Quadrants is merely as a satisfied customer. Maybe I should say ...so far. I have no experience using a Baxter Quadrant, as I am still building, but they seem real nice. Quality is felt in the control of the friction device.

        One of the problems I needed to solve is specific to the Patrol. The position of the quadrant needs to avoid the flap handle. My desire is to have the Throttle and the Prop Controls on the front throttle quadrant, with the Mixture Control located in the instrument panel. So, having two levers makes the quadrant wider than a quadrant with one lever control, (see Bob's below). After looking at other builds at Oshkosh, I preferred the quadrant's position to be below the window sill.

        Bob has his positioned below the sill.

        IMG_5887.jpg
        The blue line of the photo below is my fuslage. The tube with the blue line seemed to me to be the initially obvious place for the throttle quadrant attachment. It shows a whole lot going on in that area with the flap handle and the window latch.
        Screen Shot 2018-08-20 at 9.40.35 AM.png

        In the photo below of Bob's Patrol, the red line represents the flap handle....the friction knob sticks out about an inch past the body of the Baxter throttle quadrant. If I simply attached it to the inside of the tubing below the window sill, the friction knob became a knuckle buster.....scratching the knuckles on the knurled knob in every application of full flaps.
        IMG_5882.jpg

        So after OSH I knew I wanted my quadrant to fit under the sill, and allow pain free extension of full flaps.

        The quadrant came with a straight throttle lever (Black knob) which I modified about 1/2 way (a slight bend) up to make it fit under the window sill. The prop lever (Blue knob) viewed in the photo was not altered. I liked the vertical position of the knobs because when my hand is placed on the flap lever, its above the friction knob, and under the throttle lever. Unfortunately, the horizontal postion of the black ball was too close to the fuselage tube and didn't feel good at all.

        So I made a new lever out of 1/8" 6061 Aluminum to move the ball inboard another inch.
        IMG_6065 (1).jpgIMG_6068.jpg

        Now the throttle knob feels just right! The knuckles dont interfere.

        Now, lets look at the Quadrant's mount. I fabricated two mounting plates, one inside the other.
        Screen Shot 2018-08-20 at 9.53.15 AM.png
        One is permanent, one is removable.The larger Fuselage Mounting Plate was fabricated from .032 2024-T3 sheet AL. The smaller inner plates is secured to the Quadrant Body and is 1 inch larger than the body itself. In the photo below, this smaller inner plate is clecoed to a larger Fuselage Mounting Plate. I stiffened the larger Fuselage Mount Plate by putting a flange on each edge of its perimeter. Its attached to the fuselage tubing with one Adle Clamp, and attached to the front fuselage former with clecos. (my fabrication method was to make a pattern out of poster board, then the real one out of AL.

        Notice my mount does not require welding and allows easy removal of the quadrant after I replace the clocos with nut plates and machine screws. I think a 4130 welded steel mount could easilybe lighter, but I am a novice, and am avoiding welding. If one welds with confidence, I would go that route.

        You might be interested in a backside photo of the assembly.

        IMG_6061.jpg

        I am running out of factory parts to install. The environment of building changes significantly after all the factory parts are installed. There is no Throttle Quadrant installation information or parts included with the kit or in the plans. It requires thinking and problem solving. So will the electrical, avionics, firewall forward....I guess thats why I wanted to share my throttle quadrant install. It might help you understand one persons barriers, problems, and solutions and improve or speed up the decision making and building process.




        Attached Files
        Last edited by Bcone1381; 08-20-2018, 09:17 AM.
        Brooks Cone
        Southeast Michigan
        Patrol #303, Kit build

        Comment


        • #5
          Looks good Brooks. I assume it all feels real solid with the two mounting plates and how you have attached them to the fuselage with the Adel clamps and to the former? Mark

          Comment


          • #6
            Yeah, it feels solid...for a throttle mount that is. I will be using the fuselage tubes to hoist lift and hoist myself into the front seat instead of the throttle knob though.

            But if I think about slamming the throttle forward like one could possible do if they are in an unexpected panic go-around situation, its solid and not moving...same when its brought back to idle.
            Brooks Cone
            Southeast Michigan
            Patrol #303, Kit build

            Comment


            • #7
              Mark;

              After some reflection about your question, I wonder if it would improve things to position the black throttle knob above the window sill (instead of beside it) to reduce stress on the quadrant when downward pressure is applied to the knob. That is probably a good idea...easy fix.
              Brooks Cone
              Southeast Michigan
              Patrol #303, Kit build

              Comment


              • #8
                Lets update this thread. When I wrote the original post, I neglected to accommodate for attachment of the control cable to the levers. The education process of amateur built aircraft prevailed though. You can see in post #4 that a steel fuselage tube is right in front of the quadrant. It was unworkable ......And I was so proud of my creation! Famous saying "What you see is all there really is." I was so focused on getting a two lever quadrant to fit and accommodate the flap lever that I did not see and understand the cable aspect of the job.

                This first photo shows the Baxter quadrant with a single lever and a friction control knob mounted to the window sill using the quadrants AN3 bolts and nut plates. It's solid and secure. Also see the window latch. I am not going to use the kit provided J hook. The tab will rotate into a slot that i will cut and reinforce on the window will after the window is installed. Mark G used this design on his first patrol. The interconnect bar between the rear and front throttle is 1/16" X 3/4" 2024T3 AL that I had on hand. Attempts at using tubing proved difficult for me. This bar was a super simple and solid solution.
                IMG_0333.jpg

                A view from the rear throttle quadrant. Note, no friction control knob on the rear quadrant. Only the front Quadrant controls the friction.
                IMG_0334.jpg \

                Close up view of the front quadrant and the window latch.
                IMG_0336.jpg

                Here is a corner panel I fabricated from .050 AL. It secures the Throttle Cable, a parking brake cable, and a dual USB jack to charge cell phones and iPads. There is plenty of room to actuate the flap handle.
                IMG_0364.jpg

                This is the big picture. The Mixture and Prop and knob are on the left side of the instrument panel.
                IMG_0365.jpg
                Attached Files
                Last edited by Bcone1381; 02-27-2020, 05:48 AM. Reason: speling
                Brooks Cone
                Southeast Michigan
                Patrol #303, Kit build

                Comment

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