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Thread: Differential Braking on Quad PPC

  1. #1

    Differential Braking on Quad PPC

    Hi folk - this is a repost from my thread for building a powered parachute:

    The uncontrolled airport nearest me is not level. In fact, it goes downhill for half the length and uphill for the rest. So, I think I'll need brakes to control my PPC during takeoff and landing.

    I'm thinking about using differential braking on my quad to steer the PPC on the ground. I'd put the discs on the rear wheels of the quad. I'm thinking I'd use Azusa 8 inch wheels:

    http://www.aircraftspruce.com/catalo...zusa8astro.php

    With Shimano hydralic disc brakes and 8 inch (or smaller) discs:

    https://www.bikenashbar.com/cycling/...set-sh-blm8000
    https://www.bikenashbar.com/cycling/...md-adbr03-base

    I would prefer not to caster the front wheels - do you folks think this setup would provide enough ground steering?

    Thanks, Michael

  2. #2

    Join Date
    Jan 2012
    Posts
    254
    The quick answer is yes but the question implies that your understanding of PPC operations is not adequate for the design of a successful unit.

    First, will you be on concrete or grass? I am not convinced you will need any wheel brakes. A steerable wheel would be much more useful and that may not be required.

    Landings and aborted takeoffs are made by killing the engine so the lines do not contact the spinning prop and the wing provides more than enough stopping power. I have difficulty envisioning a field with enough slope to require brakes.

    I can see you may want the brakes in a big heavy high power (rotax 912) two seater but I was under the impression your plans were for more of a powered paraglider.

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