Mini Multi Big Rotor

by FliteTest | April 25, 2016 | (6) Posted in Projects

Peter decided to experiment with bolting two large high efficiency 6S motors to a 280mm racing quadcopter.

Peter pulled the large Avroto motors from our Helicarrier project and decided to power the entire copter with a 4200mah 4S battery.

He used a Y harness to connect the speed controller to an AUX channel on the receiver, then tied that channel to the throttle slider on his transmitter. 

The maiden looked promising…until all of the support motors burned up. Peter swapped the quadcopter motors for 2208 / 2000 kv motors and took it for a second test flight.

The copter was pretty unstable, so we felt a lot safer on the other side of the shop door.

Peter successfully landed it after 9 minutes of flight time. Although we got the copter airborne and workable, the copter would be a lot more stable if the smaller motors were outside of the disc area of the center lifting prop…but that’s a project for another day. 

What quadcopter hacks do you have? Share them with us in the comments or in your own article!

COMMENTS

JasonEricAnderson on April 26, 2016
I love at the end it becomes "Will it blend?". Fun stuff guys.
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notsane on April 26, 2016
The two large props turning in opposite directions approximately balance the torque between them. I doubt the smaller motors could oppose a single large props torque. Of course there's still a twisting moment between them that's really noticable during the flip attempt. Interesting concept though!
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danallen82 on April 27, 2016
Maybe it should be a simple coaxial setup without a swash plate.
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abieex on April 26, 2016
Best episode in a long time! Not one, but two wild men playing with dangerous toys! Bravo
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Sea_Kerman on April 26, 2016
Wow. You figured out how to make a multirotor somehow MORE terrifying.
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Spacemonkeykj on April 27, 2016
Yet another Peter the Mad Scientist experiment... I love how he does these crazy things, and knows exactly how they all work out. Awesome episode guys!
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danield on April 26, 2016
Longer booms for the little motors, so as to keep air flows separate.
I can't believe you guys get paid to have this much fun.
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danallen82 on April 26, 2016
Haha that is a fun test, great job on trying something that not many others have.
Whenever I heard people say 6s+ is more efficient I sort of cringe because it isn't well understood. Yes the most efficient setups use higher volts, however they are using sub 200kv motors. The goal is to use the least amount of energy with minimal resistance. So actually the practical setup is to use the biggest possible prop, a flat wide stator, low KV, and lowest possible voltage to hover.
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Battershell on April 26, 2016
Holy Dandelions Batman!!!
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james.ketchem on April 26, 2016
peter try using just 1 of the bigger motor ,the bottom one you will not have the prop wash that you are getting from the top on
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ChopperChopper on April 28, 2016
How about one of those aircraft 'contra-rotating' propeller setups? Either with twin motors turning one sleeved shaft around a regular shaft, as available from HK, Or a belt setup so only one motor to save weight as in some of the competition F3A aerobatic planes.
I know danallen82 has said the same thing (above) but this is DOable! Both big props on top, extended arms for stabilisers - you'd end up with........well, a helicopter! Oh...
Good fun video chaps. Thanks.
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zukiguy on April 27, 2016
Needs the bottom one to counter the
torque of the top one
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TriTriAgain on April 27, 2016
I did like this episode! Great job guys.
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Mini Multi Big Rotor