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Thread: Anyone Still Playing With Quads?

  1. #1
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    Anyone Still Playing With Quads?

    This is interesting!
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    Skinny is offline General More Posts Than Postman Pat
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    Ive seen those ducted fan hover machines before. Never really saw the point as small EDFs are LOUD, inefficient and relatively fragile.

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    But amazing feat of engineering. would be good to stick wings on it and make vtol How fast would that be?
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    Quote Originally Posted by Bone Head View Post
    But amazing feat of engineering. would be good to stick wings on it and make vtol How fast would that be?
    If you stick wings on it, you are going to have very serious control problems while hovering. Ive seen someone slap foldable wings on it, but it was terrible as a drone and terrible as an airplane, still "flying" with like 45 degree nose up. CG is another problem, you cant have it too high up when hovering, your cant have to far back when you want to transition in to airplane.

    As for going fast; you can go pretty fast with 4 props



    many racing quads can do 200+ KmH in a straight line and I believe the world record is above 300 (200+mph). Granted, a large EDF airplane can go faster, but a small VTOL kludge plane, probably not. There is a reason we transitioned away from single prop "hover craft" to multirotors.

  5. #5
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    So how do they get over the issues of the airflow over the prop at speed as with helicopters?
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  6. #6
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    Fundamentally, they dont and I dont think they will ever go faster than helicopters. That said, quads dont have a swashplate. As you increase speed, the pitch attitude of the craft and the angle of attack of the propeller blades changes proportionally. At extreme speeds it becomes more akin to a regular propeller on a plane as the entire quad flies with its nose pointed almost vertically to the ground, and almost all thrust is used (/wasted) to propel it forward, not to generate lift. How that affects theoretical maximum speeds, I have no clue, but its clearly not very efficient

    One more note: unlike helicopters, racing quads will have 4:1 or even 10:1 trust to weight ratio. Thats why it works at all even at extreme angles. At thats more likely to determine max speed than mach effects.
    Last edited by Skinny; 11-09-2018 at 18:20.

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