Rotor Helicopter
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E-Flite Blade mSR Micro Electric R/C Helicopter Parts Single Rotor DSM2 2.4GHz |  |
6 Bids | US $20.15 | 2h 25m |
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E-Flite Blade SR 120 Electric R/C Helicopter Parts Single Rotor LiPo Sub Micro | |
5 Bids | US $26.00 | 2h 26m |
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E-Flite Blade SR Electric Helicopter RC LiPo DSM2 Single Rotor Brushless | |
5 Bids | US $76.51 | 2h 26m |
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E-Flite Blade mSR X Micro Electric R/C Helicopter Parts Single Rotor DSM2 Basic | |
13 Bids | US $38.10 | 3h 1m |
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E-Flite Blade mSR X Micro Electric R/C Helicopter Single Rotor RTF | |
2 Bids | US $79.99 | 4h 55m |
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main rotor head assembly Upgrade CNC For RC ALIGN Trex 450 V2 RC helicopter | |
7 Bids | US $11.50 | 23h 14m |
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New Align RC Helicopter Part Lot, Struts, Rotor Holder, Shafts, T-Rex, TREX | |
1 Bid | US $4.99 | 1d 1h 36m |
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Flybarless Metal main rotor Head set for align 450 sport v3 rc remote helicopter | |
1 Bid | US $.10 | 1d 2h 55m |
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ALIGN 700N Metal Main Rotor Holder/Silver Helicopters HN7004QF & HN7003 | |
0 Bid | US $40.00 | 1d 3h 25m |
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205 carbon Rotor Main Blade for align 250 rc helicopter | |
0 Bid | US $.10 | 1d 3h 58m |
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F01168 Main Rotor Blade S107 S105 for Syma S107G S105G Metal Alloy Helicopter | |
14 Bids | US $1.75 | 1d 5h 58m |
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E-FLITE BLADE CX2 TWIN ROTOR BLADE HELICOPTER W/ LP5DSM 2.4 GHZ RADIO WORKS#1881 | |
1 Bid | US $49.99 | 1d 21h 17m |
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E-FLITE BLADE CX2 TWIN ROTOR BLADE HELICOPTER FOR PARTS OR REPAIR #1882 | |
2 Bids | US $29.99 | 1d 21h 40m |
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E-FLITE BLADE CX2 TWIN ROTOR BLADE HELICOPTER FOR PARTS OR REPAIR #1883 | |
6 Bids | US $15.00 | 1d 21h 49m |
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MAIN GEAR & TAIL ROTOR GEAR, 3D 500 JR Series Helicopter Vibe 500e Compatible | |
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US $8.99 | 1d 23h 58m |
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SYMA S022 CHINOOK 3-CHANNEL TANDEM ROTOR RC HELICOPTER | |
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US $79.99 | 2d 1h 55m |
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28" MJX 2.4G LCD/PRO 70cm 4 Channel Sigle-Rotor RC Helicopter HF45 RED | |
0 Bid | US $115.00 | 2d 5h 10m |
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v3 main rotor head & tail for Align 450 RC helicopter | |
1 Bid | US $.10 | 1d 2h 57m |
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2 PCS Universal 325mm Wood Main Rotor Blade for Trex 450 RC Helicopter White New | |
0 Bid | US $.99 | 20h 6m |
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4 Plastic 160mm Main Rotor Blade for ESKY EK1H-E020 Big LAMA RC Helicopter Black | |
0 Bid | US $.99 | 20h 7m |
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2 X New 325mm Glass Fiber Main Rotor Blade for Trex 450 RC Helicopter Red&White | |
0 Bid | US $5.99 | 20h 7m |
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2 Pcs 275mm Wood Main Rotor Blade for Esky Honey Bee King 2 RC Helicopter White | |
0 Bid | US $.99 | 20h 8m |
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2 X 205mm Carbon Fiber Main Rotor Blade for Trex 250 3D RC Helicopter White New | |
0 Bid | US $7.99 | 20h 8m |
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2 PCS 290mm Universal Main Rotor Blade for Walkera 36 60 68 RC Helicopter Black | |
0 Bid | US $.99 | 20h 8m |
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2 X 325mm Glass Fiber Main Rotor Blade for Trex 450 RC Helicopter Yellow&Black | |
0 Bid | US $5.99 | 20h 8m |
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ROTOR WORLD MODEL HELICOPTER MAG #43 GRAUPNER SQUIRREL LEARN PROUETTES PICOO XL | |
0 Bid | US $1.17 | 2d 20h 10m |
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Main Blade Parts for HCW 8500 Sky King RC Helicopter Spare Rotor Blades | |
0 Bid | US $.98 | 20h 26m |
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ROTOR WORLD MODEL HELICOPTER MAG #34 CENTURY BLACKHAWK AIRWOLF VARIO BELL47 | |
0 Bid | US $1.17 | 2d 20h 11m |
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ROTOR WORLD MODEL HELICOPTER MAG #32 X-CELL FURION T-REX 500 MERLIN PULSAR | |
0 Bid | US $1.17 | 2d 20h 11m |
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ROTOR WORLD MODEL HELICOPTER MAG #31 BERGEN INTREPID BLADE MCX PICOO TANDEM Z-1 | |
0 Bid | US $1.17 | 2d 20h 11m |
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Rotor Helicopter
On the basis of conservation of angular momentum, discuss why a helicopter must have more than one rotor.?
On the basis of conservation of angular momentum, discuss why a helicopter must have more than one rotor (or propeller). Discuss two or more ways in which the second rotor (or propeller) can operate in order to keep the body of the helicopter stable.
Given a single rotor providing lift, the helicopter drive train must apply torque to keep the rotor spinning against air drag. This results in an equal and opposite reaction torque applied to the helicopter body. Without the application of a torque opposing this reaction torque the helicopter would spin helplessly and eventually go out of control. The opposing torque can come from a tail rotor or from a second lift rotor the rotates in the opposite direction to the first rotor.
Tying this to conservation of angular momentum is a bit tricky. You cannot say that with only the single lift rotor the sum of the helicopter plus rotor angular momenta remains constant because that isn't true; as the helicopter continues to apply torque to the rotor the body spins up even if the rotor maintains a constant angular velocity. But you can say that the total angular momentum, including that which the rotor imparts to the air, is constant. The ang. mom. of the air is continually increasing in a direction opposite to the increase of the body angular momentum. Of course a tail or second lift rotor nulls out the angular momentum of both the body and the air.
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E-Flite Blade mSR Micro Electric R/C Helicopter Parts Single Rotor DSM2 2.4GHz | |
6 Bids | US $20.15 | 2h 25m |
|
E-Flite Blade SR 120 Electric R/C Helicopter Parts Single Rotor LiPo Sub Micro | |
5 Bids | US $26.00 | 2h 26m |
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E-Flite Blade SR Electric Helicopter RC LiPo DSM2 Single Rotor Brushless | |
5 Bids | US $76.51 | 2h 26m |
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E-Flite Blade mSR X Micro Electric R/C Helicopter Parts Single Rotor DSM2 Basic | |
13 Bids | US $38.10 | 3h 1m |
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E-Flite Blade mSR X Micro Electric R/C Helicopter Single Rotor RTF | |
2 Bids | US $79.99 | 4h 55m |
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main rotor head assembly Upgrade CNC For RC ALIGN Trex 450 V2 RC helicopter | |
7 Bids | US $11.50 | 23h 14m |
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New Align RC Helicopter Part Lot, Struts, Rotor Holder, Shafts, T-Rex, TREX | |
1 Bid | US $4.99 | 1d 1h 36m |
|
Flybarless Metal main rotor Head set for align 450 sport v3 rc remote helicopter | |
1 Bid | US $.10 | 1d 2h 55m |
|
ALIGN 700N Metal Main Rotor Holder/Silver Helicopters HN7004QF & HN7003 | |
0 Bid | US $40.00 | 1d 3h 25m |
|
205 carbon Rotor Main Blade for align 250 rc helicopter | |
0 Bid | US $.10 | 1d 3h 58m |
|
F01168 Main Rotor Blade S107 S105 for Syma S107G S105G Metal Alloy Helicopter | |
14 Bids | US $1.75 | 1d 5h 58m |
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E-FLITE BLADE CX2 TWIN ROTOR BLADE HELICOPTER W/ LP5DSM 2.4 GHZ RADIO WORKS#1881 | |
1 Bid | US $49.99 | 1d 21h 17m |
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E-FLITE BLADE CX2 TWIN ROTOR BLADE HELICOPTER FOR PARTS OR REPAIR #1882 | |
2 Bids | US $29.99 | 1d 21h 40m |
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E-FLITE BLADE CX2 TWIN ROTOR BLADE HELICOPTER FOR PARTS OR REPAIR #1883 | |
6 Bids | US $15.00 | 1d 21h 49m |
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MAIN GEAR & TAIL ROTOR GEAR, 3D 500 JR Series Helicopter Vibe 500e Compatible | |
|
US $8.99 | 1d 23h 58m |
|
SYMA S022 CHINOOK 3-CHANNEL TANDEM ROTOR RC HELICOPTER | |
|
US $79.99 | 2d 1h 55m |
|
28" MJX 2.4G LCD/PRO 70cm 4 Channel Sigle-Rotor RC Helicopter HF45 RED | |
0 Bid | US $115.00 | 2d 5h 10m |
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v3 main rotor head & tail for Align 450 RC helicopter | |
1 Bid | US $.10 | 1d 2h 57m |
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2 PCS Universal 325mm Wood Main Rotor Blade for Trex 450 RC Helicopter White New | |
0 Bid | US $.99 | 20h 6m |
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4 Plastic 160mm Main Rotor Blade for ESKY EK1H-E020 Big LAMA RC Helicopter Black | |
0 Bid | US $.99 | 20h 7m |
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2 X New 325mm Glass Fiber Main Rotor Blade for Trex 450 RC Helicopter Red&White | |
0 Bid | US $5.99 | 20h 7m |
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2 Pcs 275mm Wood Main Rotor Blade for Esky Honey Bee King 2 RC Helicopter White | |
0 Bid | US $.99 | 20h 8m |
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2 X 205mm Carbon Fiber Main Rotor Blade for Trex 250 3D RC Helicopter White New | |
0 Bid | US $7.99 | 20h 8m |
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2 PCS 290mm Universal Main Rotor Blade for Walkera 36 60 68 RC Helicopter Black | |
0 Bid | US $.99 | 20h 8m |
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2 X 325mm Glass Fiber Main Rotor Blade for Trex 450 RC Helicopter Yellow&Black | |
0 Bid | US $5.99 | 20h 8m |
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ROTOR WORLD MODEL HELICOPTER MAG #43 GRAUPNER SQUIRREL LEARN PROUETTES PICOO XL | |
0 Bid | US $1.17 | 2d 20h 10m |
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Main Blade Parts for HCW 8500 Sky King RC Helicopter Spare Rotor Blades | |
0 Bid | US $.98 | 20h 26m |
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ROTOR WORLD MODEL HELICOPTER MAG #34 CENTURY BLACKHAWK AIRWOLF VARIO BELL47 | |
0 Bid | US $1.17 | 2d 20h 11m |
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ROTOR WORLD MODEL HELICOPTER MAG #32 X-CELL FURION T-REX 500 MERLIN PULSAR | |
0 Bid | US $1.17 | 2d 20h 11m |
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ROTOR WORLD MODEL HELICOPTER MAG #31 BERGEN INTREPID BLADE MCX PICOO TANDEM Z-1 | |
0 Bid | US $1.17 | 2d 20h 11m |
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5 Pair 325mm Main Rotor Blade For RC Trex 450SE Trex 450XL Trex 450S Helicopter | |
2 Bids | US $2.25 | 1d 1h 6m |
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4 Pair 325mm Main Rotor Blade For RC Trex 450SE Trex 450XL Trex 450S Helicopter | |
4 Bids | US $11.37 | 1d 1h 6m |
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2 Pair 325mm Main Rotor Blade For RC Trex 450SE Trex 450XL Trex 450S Helicopter | |
1 Bid | US $.99 | 1d 1h 7m |
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HeliMax AXE EZ Helicopter Outer Rotor Shaft HMXE8412 | |
0 Bid | US $.64 | 3d 1h 46m |
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R/C Sky Invaders 3-channel Rescue Helicopter Dual Rotor ~ R-3100 ~ NEW | |
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US $37.00 | 3d 2h 12m |
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5 x Tail Rotor Blades for Syma S107 RC Helicopter Spare Part Replacement | |
0 Bid | US $.99 | 3d 3h 6m |
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8" V911 4CH 2.4GHz Single rotor RC Remote Control Outdoor Helicopter w Gyro 9217 | |
0 Bid | US $49.99 | 1d 3h 29m |
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26" Double Horse DH 9104 3CH Single Rotor Outdoor RC Helicopter w/ Gyro Blue | |
0 Bid | US $69.90 | 1d 3h 34m |
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26" Double Horse DH 9104 3CH Single Rotor Outdoor RC Helicopter w/ Gyro Red | |
0 Bid | US $69.90 | 1d 3h 34m |
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Air Hogs Rc Helicopter Havoc help + remote control + free spare tail rotor | |
0 Bid | US $9.99 | 3d 4h 52m |
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Slow motion video of a helicopter rotor blade
