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Old 01-06-2013, 08:54 PM
Owly Owly is offline
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Default Wigal

I just encountered this design today: http://virtualultralightmuseum.com/special.htm Scroll down and you will come to the Wigal which tilts the engine to throw the prop blast (tractor gyro) up through the rotor. From the description it is to "enable hovering and takeoff". It obviously would not enable hovering..............
A year or so ago I put forth the concept of two tractor engines on a tilting boom, exactly the same concept. The idea being that a high velocity slipstream through the working area of the rotor would induce lift at a far lower or even zero forward speed. Casting about for ideas, one comes up with some bizarre ones............... the holy grail is zero takeoff and landing speed. Zero landing speed is achievable......... Zero speed liftoff is another story. Clearly, ground mounted fans would have the desired effect............ Logic says that props mounted ON the machine would NOT. But it would be interesting to know............

Howard
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Old 01-06-2013, 09:01 PM
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Maybe it's just me ... but I looked and looked and found no "Wigal".
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Old 01-06-2013, 09:42 PM
Blue Chips Blue Chips is offline
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It's just you

7th pic down.
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Old 01-07-2013, 06:23 AM
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JEFF TIPTON JEFF TIPTON is offline
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Interesting.

http://virtualultralightmuseum.com/special.htm
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Old 01-07-2013, 07:16 AM
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Wel! it would be nice to take the credit for the one with my name on it but its not me. There must be another Harry Albert out there some where or its a typo. Harry Albert
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Old 01-07-2013, 07:23 AM
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I especially liked the Sport Copter "Velocity". I hope they decide to proceed with it.
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Old 01-07-2013, 08:43 AM
Owly Owly is offline
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Default Spin-up, or spin up and lift?

The question nobody has ventured an answer to is weather the prop blast through the rotor provides ONLY spin up, or it results in lift also. It's a little like setting a fan on the deck of a sailboat to provide wind ;-) The 4 paddle blades are obviously intended as a pre-rotator, though considering how rapidly the prop blast spreads outward and reduces in velocity, a great deal of the rotor must be in the prop wash. It's a bizarre looking contraption......... It would be fun to model it and see what it actually does. I'm also wondering how much pre-rotation one gets from an ordinary tractor mounted engine......... is there any significant amount?

To paraphrase a popular song:

"You are the wind beneath my rotor" (The asphalt beneath my tires?)
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Old 01-09-2013, 08:10 AM
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Doug Riley Doug Riley is offline
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Pointing the engine at the rotor does not result in a net increase in lift (it can work as a prerotator on the ground, where lift doesn't matter). The prop produces a downward thrust that adds phantom weight to the aircraft. The net would almost certainly be a loss in performance, not to mention the trim problems with all that thrust pushing the nose down.

If this idea worked, parachutists could wear small engines and props on their heads, with the prop blast aimed straight up to fill the chute.
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Old 01-09-2013, 09:05 AM
Owly Owly is offline
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Default blown rotor

Doug:
This was more or less my take on it........... no free lunch ;-)
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