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HelicopterMain Discussion › Best enduranse
01-22-2013 06:14 PM  4 years agoPost 1
shaiko

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Chicago, IL - US

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Hello,

In your opinion, which of the following airframes will have the highest endurance (flight time):

1. Quadrotor with 4 brushless motors.
2. Traditional Heli with a tail rotor driven by a brushless motor.
3. Coaxial Heli with 2 counter rotating rotors driven by a brushless motor

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01-22-2013 06:53 PM  4 years agoPost 2
MartyH

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USA

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There is no one answer because of so many variables. I would say a coaxial in general because like a quad it's puting nearly all the energy into lift and losing efficiency in only two motors. The quad is using 4 but it's blades are each in clean air so I bet it's close.

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01-22-2013 09:43 PM  4 years agoPost 3
wrongler

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Brewerton, New York

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The coaxial, because it is easier to fly than the others, therefor it will have better endurance!

Bill Whittaker

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01-22-2013 11:07 PM  4 years agoPost 4
shaiko

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Chicago, IL - US

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MartyH,

Don't you think that the coaxial with its increased mechanical complexity and higher weight(compared to a tailed heli) will require more thrust and therefore be able to fly for less time ?

wrongler,
I don't see the rationality of your answer.

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01-22-2013 11:18 PM  4 years agoPost 5
RM3

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Killeen, Texas - USA

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my guess would be on the quad rotor...simply because of two things...all power goes to lift and the blade design, especially on the quad can be optimized for lift....

now granted there is the question of what you mean by endurance...like: hover, forward flight, or all the above like sport, 3d, lifting capability...

showing a preference will only get you into trouble, 90% of everything is crap...

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01-22-2013 11:32 PM  4 years agoPost 6
shaiko

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Chicago, IL - US

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RM3,

By endurance I mean mostly hover and some forward flight.
What do you mean by "blade design"?

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01-23-2013 12:04 AM  4 years agoPost 7
RM3

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Killeen, Texas - USA

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blade design...

on a 3d capable heli the blades will have a symetrical shape which allows them to make lift on either side of the blade depending on the angle or blade pitch....but this comes at a cost, notibly a loss in efficiency.

some blades like those used for industrial helis can be semi symetrical blade shapes, they are for mostly "upright" flying and give good lift, but still allow for good enough autos which requires the blades to respond with airflow from benith the blade (to keep them spining before the flare)

with a coax fixed pitch or quad rotor, the blades are optimized for lift in one direction only, so more energy actually gets "converted" to lift rather than drag, air resistance and so forth....

showing a preference will only get you into trouble, 90% of everything is crap...

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01-23-2013 12:05 AM  4 years agoPost 8
nobato1

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USA

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whats the purpose 4 the endurance? just play around, or carry stuff like a camera?

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01-23-2013 12:07 AM  4 years agoPost 9
ebonicrobot

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East Bay, CA

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I haven't watched any coaxial heli videos but I have watched numerous quad copter vids on YouTube, and man those things get great flight time

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01-23-2013 12:14 AM  4 years agoPost 10
shaiko

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Chicago, IL - US

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the purpose is carrying payload for the longest amount of time. Like a camera...

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01-23-2013 12:16 AM  4 years agoPost 11
nobato1

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USA

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regular heli, big disk, using very slow rpm has the best endurance, AND lifting capability by far

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01-23-2013 12:28 AM  4 years agoPost 12
LiveToDrive76

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Fort Meade, SD

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I would say regular heli also and maybe add 4 or 5 blade rotor head.

Erik

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01-23-2013 12:37 AM  4 years agoPost 13
shaiko

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Chicago, IL - US

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4 or 5 blades maybe a good idea for heavy lifting. But, it's no good for endurance.

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01-23-2013 12:54 AM  4 years agoPost 14
LiveToDrive76

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Fort Meade, SD

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It's a trade-off but I guess it depends on priorities.

Erik

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01-23-2013 01:09 AM  4 years agoPost 15
nobato1

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USA

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4 or 5 blades maybe a good idea for heavy lifting. But, it's no good for endurance
correct, less blades is more efficient

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