Posted by admin | Posted in Scale Models | Posted on 13-12-2008
Tags: diy, electronics, flying, helicopter, helicopter kit aircraft, helicopter kit ultralight, helicopter kite, helicopter kits, helicopter kits for sale, helicopter kits rc, kit, rc
Searching For Helicopter Kit ? Limited Offers Below
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 4 Vintage kit model Helicopter UNITED STATES ARMY 5967 tiger $7.99 Time Remaining: 47m |
 ALIGN RC Radio Control T Rex Trex 450X EP Helicopter Kit in Box $71.13 (15 Bids) Time Remaining: 54m |
 Airfix Westland Sea King Helicopter 172 model kit $9.99 Time Remaining: 59m |
 1986 TESTORS BAe Sea Harrier FRS1 1 72 Kit 367 Unopened 606 $9.95 Time Remaining: 1h 36m |
 1989 TESTORS Bell AH 1T SeaCobra 1 72 Kit 634 NEW 605 $9.95 Time Remaining: 1h 36m |
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 Wooden DIY Puzzled Apache Helicopter Model Woodcraft Construction Kit Gift $13.50 Time Remaining: 2h 49m Buy It Now for only: $13.50 |
 Children Apache Helicopter Wood Woodcraft DIY Construction Kit Gift $13.50 Time Remaining: 2h 50m Buy It Now for only: $13.50 |
 Align T REX 550E V2 3GX Helicopter KX021008AT KIT ONLY NO ELECTRONICS $280.00 (29 Bids) Time Remaining: 3h 1m |
 Rc Helicopter Training Kits for Beginer Eflite 400 450 helicopter Trex 450 TGMS1 $3.69 Time Remaining: 3h 5m Buy It Now for only: $3.69 |
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Coaxial RC Helicopters: How Do They Work?
Coaxial helicopter is one of the more popular images that come to mind when people think about electric RC helicopters. And for good reasons too; these double-bladed helicopters is accredited with bringing hordes of new enthusiast into the world of RC aviation. Their popularity stems from their unequivocal stability in the air - which makes them relatively easier to master when compared to their single rotor counter part. They are also predictable enough to be flown within the compounds of one's home, securing its spot as one of the most loved indoor fliers. Being able to fly right out of the box because they are sold as RTF (Ready to Fly) kits adds to their appeal.
So where did such stability come from? To answer that, the first step lies in understanding how helicopters work. A single-rotor helicopter generates lift when their rotor rotates. As the main rotor turns, another force will also be generated - known as torque, which will in turn cause the entire fuselage to turn in the opposite direction. Since the days when helicopters were in their nascent stage, their pioneers have learnt to counter this effect by including another smaller perpendicular rotor in the tail. This rotor counters the any rotation generated by the torque as well as provides pilots a mean to control the direction in which the helicopter's nose is pointing at, more technically known as the yaw. To control the yaw, the pilot simply changes the pitch (or the angle) of the tail rotor.
Coaxial helicopters, on the other hand, eliminate the need of a tail rotor completely. This is due to the fact that these fliers have two rotors, one on top of the other, rotating in opposite directions. In effect, the torque generated by each rotor cancels out one another. When such feat is coupled with two rotors' lift complementing each other results in the extraordinary stability and hovering ability. Because hovering is one of the main components of a helicopter's flight, "easier to hover" is almost synonymous to "easier to fly". Controlling the yaw in this setup becomes only a matter of slowing or speeding up one of the two rotors. Another merit that comes almost as a bonus is that theoretically, these helicopters do not require a gyro - which means that much less tinkering and setting up is needed.
Although very widely praised, coaxial helicopters are not without faults. The first one stems from the fact that in order to fly, the speed of the two rotor blades must be equal. In fact, these helicopters are so dependent on the synchronicity of its blades that even the slightest deviation is detrimental. So much so that these helicopters will just spin wildly on the ground, never to lift off. Their two motors simply have to always be in their most pristine state. Also, the stability of these helicopters comes at the price of sacrificed maneuverability; they are notoriously slow and unresponsive. Nevertheless, perhaps the utmost annoyance comes when the two blades bite into each other in mid air when most extreme cyclic controls are applied.
All in all, coaxial helicopters are here to stay. They have become the favorite beginners' RC helicopter. At the same time, many experienced pilot enjoy a flight or two of easy indoor flying with these helicopters once in a while.
Note: Although these coaxial helicopters are "relatively" easier to fly than their conventional counterparts, they still require hours of practice. Also, their fast rotating blade can cause just as much injury as bigger model helicopters. Therefore, never treat them like toys.
About the Author
Radio-controlled aviation is a fascinating hobby. Learn all about its newest and fastest growing sector, electric RC helicopters at http://www.electric-rc-helicopter.com.
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4 Vintage kit model Helicopter UNITED STATES ARMY 5967 tiger $7.99 Time Remaining: 47m |
ALIGN RC Radio Control T Rex Trex 450X EP Helicopter Kit in Box $71.13 (15 Bids) Time Remaining: 54m |
Airfix Westland Sea King Helicopter 172 model kit $9.99 Time Remaining: 59m |
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1986 TESTORS BAe Sea Harrier FRS1 1 72 Kit 367 Unopened 606 $9.95 Time Remaining: 1h 36m |
1989 TESTORS Bell AH 1T SeaCobra 1 72 Kit 634 NEW 605 $9.95 Time Remaining: 1h 36m |
USA Stock 450 Sport Rc Helicopter Kits W motor ESC HB730 Gyro $103.00 Time Remaining: 2h 23m Buy It Now for only: $103.00 |
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Britavia Models Westland Dragonfly HR 3 Helicopter Vacform Bag Kit $6.00 (3 Bids) Time Remaining: 2h 25m |
FIREFLY BRASS METAL SCULPTURE KIT 2001 MODEL IMPRESSIONS Helicopter 1975 unbuilt $14.99 Time Remaining: 2h 43m Buy It Now for only: $14.99 |
Wooden DIY Puzzled Apache Helicopter Model Woodcraft Construction Kit Gift $13.50 Time Remaining: 2h 49m Buy It Now for only: $13.50 |
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Children Apache Helicopter Wood Woodcraft DIY Construction Kit Gift $13.50 Time Remaining: 2h 50m Buy It Now for only: $13.50 |
Align T REX 550E V2 3GX Helicopter KX021008AT KIT ONLY NO ELECTRONICS $280.00 (29 Bids) Time Remaining: 3h 1m |
Rc Helicopter Training Kits for Beginer Eflite 400 450 helicopter Trex 450 TGMS1 $3.69 Time Remaining: 3h 5m Buy It Now for only: $3.69 |
 Aeolus 50 3D GF Nitro RC Helicopter Kit with blade free Compatible Align Trex $259.00 (1 Bid) Time Remaining: 3h 12m |
 DIY helicopter Airplane Car Auto Curved Tip Ball Link Plier 139mm Tool kit $0.01 Time Remaining: 3h 23m |
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