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Bidule 170 Hydraulic Brakes!!! Can fit other big tugs too

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  • #16
    Wow,! Excellent report Jim. That's what I was imagining how you would use them.

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    • #17
      Got a chance to really try out the Bidule brakes yesterday in Delaware...they are great!

      Temperature was on the very cool side, so being able to keep a fast idle while waiting for the next sailplane to get hooked up was very helpful. Just taxi to position, click on the park brake, and throttle up. Even used the brakes to slow down after landing a couple of times...just a super cool feature.
      A Site for Soar Eyes

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      • #18
        Wow, where were these brakes when I built the 1/3 Super Cub seven years ago? With 12" bush wheels on ball bearings and a 34" prop it would only stop rolling on the thickest sod. It was a hazard on the field.

        I ended up using mechanical disk brakes from a 1/4 scale RC car. Mounting involved several custom pieces but the results were well worth it. I ended up using a servo on each caliper for differential braking. That also added to safety as it takes much less room to line it up for the next tow.

        The key to avoiding wheel lock-up or flipping the plane over is to set full engagement to be light drag on the wheel. I have the brakes on the right slider and the mid-point detent gives light drag for slowing the plane down. Full slider travel gives a firmer hold on the brakes. A mix to rudder is always on. This releases one brake and clamps the other tighter with rudder movement. Maneuvering with differential braking is best done with the brake half way engaged.

        The fun part is using the brakes for short field takeoffs. With full brake and half flap, throttling up the DA-150 gets the plane light and the tail up. Releasing the brake while going to full throttle gets the plane off the ground in about a wing span!

        Good to know these hydraulic brakes are out there. These look very easy to mount and may find their way onto my next big plane...

        Larry

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        • #19
          They will be on my Bidule! Unfortunately not differential braking but brakes none the less!

          Tim

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          • #20
            Update:

            It seems that brake fluid is slowly lost around the O-ring seals in the master cylinder and reaches empty after about 15 hours of use. Air can then get into the hydraulic lines and the brakes start to fade and then stop working altogether.

            Our fix for this is to use an auxiliary brake fluid reservoir.

            Bidule #1 has this auxiliary reservoir mounted directly above the master cylinder with a short piece of tubing connecting the two together.

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            Bidule #2 has the auxiliary reservoir mounted away from the master cylinder and connected by way of two 90 degree Festo fittings and tubing.
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            Both of these mountings seem to work, but the one on Bidule #2 is the best because it allows the fuel tank to slide further aft making it easier to get to the front wing bolts. Also, more fluid can be added without having to bleed the lines provided the master cylinder is not allowed to go empty.
            A Site for Soar Eyes

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            • #21
              O darn! I'll have to jump in here. Jim is beta testing the resevior and it's been a great success. Upgrade products and reservoir will be coming soon to Aviation Concepts.

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              • #22
                Are carbon discs available? Love my brakes!

                Tim M.

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                • Swiss1
                  Swiss1 commented
                  Editing a comment
                  I would no recommend Carbon Brake Discs, we used to sell them for RC cars, the problem is when they get to a certain wear point they explode into fragments without any warning!

              • #23
                http://www.kingmotorrc.com/index.php...str=KM66035-2o

                Team Horizon Hobby

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                • #24
                  I've been using carbon brakes from the beginning, disc and pads show minimal wear over 60 hours of operation , They are 80mm in diameter, so a spacer is necessary to move the caliper out. Of course, taking Swiss! experience to heart, ....I inspect them periodically.

                  Click image for larger version  Name:	IMG_3649.JPG Views:	1 Size:	56.7 KB ID:	19598

                  Scott

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                  • Mosquito
                    Mosquito commented
                    Editing a comment
                    So you need to move, or shim, the brake caliper out a ways since the carbon discs are 80mm, which is bigger than the 3 inch aluminum disc provided by Aviation Concepts?

                  • MarnochS
                    MarnochS commented
                    Editing a comment
                    The aluminum rotor is 76 mm......so a 2mm shim is required
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