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HomeAircraftHelicopterMain Discussion › World Record 2.5HR Flight
10-23-2013 12:49 AM  4 years agoPost 21
icanfly

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ontario

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They would have been over 3 hours by simply using asymmetric main blades.
no kidding?

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10-24-2013 10:45 AM  4 years agoPost 22
Richardmid1

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Leeds, England

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Maybe they were using asymmetric blades?

60% of the time, it works every time!

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10-24-2013 02:40 PM  4 years agoPost 23
AirWolfRC

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42½ N, 83½ W

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The web site link in the original post says . . .
Main rotor blades: NHP Agressor 800
They are symmetric.

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10-24-2013 03:13 PM  4 years agoPost 24
Richardmid1

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Leeds, England

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Hmm, they missed a trick there then I guess. Unless symmetrical blades are actually more efficient at low rpms and higher pitch values? Who knows!

60% of the time, it works every time!

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10-25-2013 01:54 AM  4 years agoPost 25
icanfly

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ontario

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asymmetric are more efficient for upright, same as fixed pitch helis.

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10-25-2013 02:03 AM  4 years agoPost 26
AirWolfRC

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42½ N, 83½ W

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But a lot of the earlier full scale helis had symmetrical blades. eg-NACA0012
. . . but for different reasons.
. . . the center of pressure did not change with AoA.

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10-25-2013 01:27 PM  4 years agoPost 27
icanfly

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ontario

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stol low speed high lift foil would be the ticket.
AoA
Angle of Attack, I see.

The implications of this feat are that an alternative battery than lipo has successfully been applied as a power source, that low rpm/long blade combination increases duration, that a simpler LIGHTER motor design is capable in a heli application, and that the end is not near.

Could they have dropped the motor weight by cutting out the unused stator poles (would anyone suggest what else could be modded to reduce weight and or increase flight time? there are things).

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10-25-2013 02:01 PM  4 years agoPost 28
Richardmid1

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Leeds, England

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Well yes, for the power they needed a much smaller motor and ESC could have been used. As said though that battery was the biggest leap forward in flight time.

60% of the time, it works every time!

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10-25-2013 04:49 PM  4 years agoPost 29
icanfly

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ontario

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Yes, and the fact that it is possible to utilize a small motor given it was running at top efficiency/rpm, the torque of a small motor would have to be geared in such a way to take advantage of that and maintain low rotor rpm.

It's interesting, and the batteries are much less volatile than lipos.

Personally, I envision a system that would NEVER COME DOWN. Do-able, can't say how, everyone has ideas though, no worries, live on.

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10-25-2013 06:25 PM  4 years agoPost 30
qraptor

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Illinois

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I think NASA is working on a solar powered plane that can fly indefinitely. It would be very useful for weather and other imagery that currently needs LEO satellites.

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10-26-2013 12:28 AM  4 years agoPost 31
icanfly

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ontario

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plank?, well, the future of civil aviation is in personal hover craft, no roadkill either. The future is here, it'll be some time before it's seen, to some that's 25 years from now. Research has made evident many pieces of the puzzle. To some it's a hobby, to some a dream, to some a business, to some a place to spend money. To some the future is a daily grind, to other great opportunity, to some the riddle is deceiving to others the riddle is done. The future of aviation holds a promise of gentle craft in most everyone's backyard or roof top, the Jetsons? Star Trek? War of The Worlds, all very interesting.

Personally, the future is right in front, like the 3 axis gyro, or did that really have a need? It could be for a short purpose but man it's good while it lasts. The future is simpler than you can believe, and how about this item, there is a resource which is highly abundant in the USA reportedly more than anywhere else on the planet which is very important, it's really crazy to think the USA could MONOPOLIZE an extremely valuable key aviation resource. Who's going to have the last laugh?

I LOVE IT

Ever stand at the edge of the Grand Canyon, like a foot from falling away? At the edge 200 ft cliff regularly like almost every day? On a mountain and imagined sailing away like the birds nearby?

There's a peace about rc helis, hover craft, that can't be matched. Not everyone cares for 3d intensity, where soaring like a bird is not a thought what-so-ever.

I wish they had vid of the flight, a segment at least.

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