Rotor Blade
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| 6p 325mm Rotor Main Blade For ALIGN RC Trex 450 SE XL Y | |
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$13.87 Time Remaining: 16d 1h 19m Buy It Now for only: $13.87 |
| Main Blade Spare Parts for 42 QS 8005 RC Helicopter 8005 001 Rotor Blades Fans | |
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$0.99 Time Remaining: 4h 44m |
| 5pairs TNS002 325mm Carbon Fiber Main Rotor Blades for 450 SE V2 SPORT PRO S | |
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$29.99 Time Remaining: 28d 18h 25m Buy It Now for only: $29.99 |
| E Flite Blade SR Electric Helicopter RC LiPo DSM2 Parts Single Rotor Brushless | |
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$54.71 (8 Bids) Time Remaining: 6h 21m |
| 4x 325mm Main Rotor Blade For RC Trex 450 SE Helicopter | |
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$10.99 Time Remaining: 24d 1h 19m Buy It Now for only: $10.99 |
| E Flite EFLH1220 Lower Main Rotor Blades 4 Blade CX CX2 CX3 New | |
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$3.25 (5 Bids) Time Remaining: 7h 41m |
| E Flite Blade MCP X 6 Rotor Head Linkages | |
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$1.99 Time Remaining: 29d 2h 31m Buy It Now for only: $1.99 |
| E Flite Blade SR Electric Helicopter RC LiPo DSM2 Single Rotor Brushless | |
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$30.10 (4 Bids) Time Remaining: 9h 30m |
| BY 4x 325mm Glass fibre Main Rotor Blade For Trex 450 V2 SPORT PRO PRO V2 S | |
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$9.09 Time Remaining: 8d 14h 2m Buy It Now for only: $9.09 |
| E Flite Blade SR 120 Electric R C Helicopter Parts Single Rotor LiPo Sub Micro | |
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$15.00 (4 Bids) Time Remaining: 9h 30m |
| 42 QS8005 8005 RC Helicopter A B Main Rotor Blades Fans 8005 001 Spare Parts | |
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$6.99 Time Remaining: 16d 11h 25m Buy It Now for only: $6.99 |
| E Flite Blade mSR Micro Electric R C Helicopter Parts Single Rotor DSM2 24GHz | |
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$26.00 (4 Bids) Time Remaining: 9h 30m |
| Main Rotor blade balancing Balancer Tester Balance tool | |
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$7.99 Time Remaining: 18d 15h 35m Buy It Now for only: $7.99 |
| 2 Pairs of 9cm Main Rotor Blades Wings for S107 3D RC Helicopter Yellow NEW | |
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$0.99 Time Remaining: 9h 37m |
| 8x 325mm Rotor Main Blade For ALIGN RC Trex 450 SE V2 | |
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$18.99 Time Remaining: 24d 1h 23m Buy It Now for only: $18.99 |
| E Flite Blade mSR X Micro Electric R C Helicopter Parts Single Rotor DSM2 Basic | |
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$6.05 (4 Bids) Time Remaining: 10h 4m |
| 10pcs 325mm Wooden Main Rotor Blades for Align Trex 450 Helicopter | |
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$14.98 Time Remaining: 12d 16h 52m Buy It Now for only: $14.98 |
| E Flite Blade mSR Micro Electric R C Helicopter Parts Single Rotor DSM2 24GHz | |
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$26.50 (6 Bids) Time Remaining: 10h 29m |
| Main Blade Spare Parts for 42 QS 8005 RC Helicopter 8005 001 Rotor Blades Fans | |
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$6.85 Time Remaining: 6d 18h 36m Buy It Now for only: $6.85 |
| 2pc Glass Helicopter 325mm Main Rotor Blade for Trex 450 SE 450XL RC18A | |
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$0.01 Time Remaining: 11h 7m |
| AEO RC Blade MCPX Heavy Duty Hi Performance Main Rotor Blades | |
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$4.99 Time Remaining: 12d 3h 9m Buy It Now for only: $4.99 |
| 2pc Glass Helicopter 325mm Main Rotor Blade for Trex 450 SE 450XL RC17A | |
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$0.01 Time Remaining: 11h 7m |
| 6x 325mm Rotor Main Blade 325 For ALIGN RC Trex 450 R | |
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$13.87 Time Remaining: 28d 15h 10m Buy It Now for only: $13.87 |
| 325mm High Performance Carbon Fiber Main Rotor Blade RC9 | |
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$0.01 Time Remaining: 11h 7m |
| E Flite Blade 120SR Main Rotor Blade Set 3116 | |
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$5.99 Time Remaining: 18d 9h 9m Buy It Now for only: $5.99 |
| 6pc Glass Helicopter 325mm Main Rotor Blade for Trex 450 SE 450XL RC17B | |
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$4.99 Time Remaining: 11h 7m |
| Blade BLH1615 325mm Wood Main Rotor Set Blade 450 New | |
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$9.97 Time Remaining: 6d 23h 32m Buy It Now for only: $9.97 |
| E Flite Blade mSR Micro Electric R C Helicopter Parts Single Rotor DSM2 24GHz | |
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$23.00 (4 Bids) Time Remaining: 11h 30m |
| Blade MCP X KBDD Bright White Extreme Main Rotor Blades | |
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$8.99 Time Remaining: 4d 12h 47m Buy It Now for only: $8.99 |
| 5 Tail Rotor Blades for Syma S107 RC Helicopter parts | |
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$0.99 Time Remaining: 12h 6m |
| E Flite Blade MCP X Rotor Head Linkage Set 8 3522 | |
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$3.25 Time Remaining: 1d 10h 32m Buy It Now for only: $3.25 |
| 1 Pairs 325MM Glass Fiber Glass Main Rotor BladeTREX all 450 Heli RC17A | |
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$0.01 Time Remaining: 12h 7m |
| E Flite EFLH1220 Lower Main Rotor Blade 2 Pair Blade CX CX2 CX3 New | |
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$2.99 Time Remaining: 27d 9h 38m Buy It Now for only: $2.99 |
| 2pcs REAL CARBON 325mm Rotor Main Blade For Trex 450 RC9 | |
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$0.01 Time Remaining: 12h 7m |
| 10xp 325mm Rotor Main Blade For ALIGN RC Trex 450 SE Y | |
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$22.19 Time Remaining: 15d 13h 21m Buy It Now for only: $22.19 |
| 1 Pairs 325MM Glass Fiber Glass Main Rotor BladeTREX all 450 Heli RC18A | |
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$0.01 Time Remaining: 12h 7m |
| BLADE BLH3202 MSRX Tail Boom Assembly with Tail Motor Rotor Mount | |
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$10.95 Time Remaining: 16h 3m Buy It Now for only: $10.95 |
| 3 Pairs 325MM Glass Fiber Glass Main Rotor BladeTREX all 450 Heli RC17B | |
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$4.99 Time Remaining: 12h 7m |
| NEW 42 8005 QS8005 RC Helicopter Main Rotor Blade Spare Parts QS8005 001 BLADES | |
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$8.93 Time Remaining: 23d 8h 33m Buy It Now for only: $8.93 |
| 6 Rotor Main Blade For Trex 450XL SE Black Yellow 325mm | |
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$7.99 Time Remaining: 15h 33m |
| 5x Tail Rotor Blade for S107G 3CH SYMA S107 RC Helicopter Parts S105 S108 S109 | |
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$1.99 Time Remaining: 2d 11h 16m Buy It Now for only: $1.99 |
| New 2 Pairs of 8cm Main Rotor Blades Wings for 335 3C RC Helicopter | |
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$1.04 (2 Bids) Time Remaining: 19h 1m |
| NEW 335mm carbon fiber Main Rotor Blade For Trex 450 | |
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$8.98 Time Remaining: 19d 2h 10m Buy It Now for only: $8.98 |
| High Quality 315mm Symetrical Main Rotor Blade HDX450 Belt CP T REX 450 | |
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$9.99 Time Remaining: 19h 35m |
| Blade 120SR Rakon CNC Red Main Rotor Hub 12SR010 R | |
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$19.99 Time Remaining: 21d 10h 8m Buy It Now for only: $19.99 |
| BLADE mCPX 2 LONG Tail Boom Assembly w Tail Motor Rotor Mount BLH3602L MCPX2 MCP | |
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$10.95 Time Remaining: 9d 16h 4m Buy It Now for only: $10.95 |
| E Flite Blade SR Electric Helicopter RC LiPo DSM2 Single Rotor Brushless | |
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$49.00 (17 Bids) Time Remaining: 23h 47m |
| Blade MCP X KBDD 3D Pro Hot Pink Main Rotor Blades 5005 | |
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$8.99 Time Remaining: 11d 13h 58m Buy It Now for only: $8.99 |
| Main Blade Spare Parts for 42 QS 8005 RC Helicopter 8005 001 Rotor Blades Fans | |
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$0.99 Time Remaining: 1d 5h 51m |
| Blade BLH3116 Main Rotor Blade Set with Hardware Blade 120 SR 120SR New | |
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$4.87 Time Remaining: 25d 10h 32m Buy It Now for only: $4.87 |
| 4 pairs 325mm Glass Fiber Main Rotor Blade for Trex 450 V2 SPORT PRO | |
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$11.99 Time Remaining: 1d 9h 46m |
| Blade MSR X Red Main Rotor Blades W Hardware 3216RE | |
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$6.49 Time Remaining: 11d 13h 10m Buy It Now for only: $6.49 |
| E Flite Blade mSR X Micro Electric R C Helicopter Single Rotor RTF | |
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$79.99 (1 Bid) Time Remaining: 1d 11h 59m |
| Blade BLH1671 Tail Rotor Blade Set Blade 450 3D New | |
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$2.87 Time Remaining: 4d 7h 48m Buy It Now for only: $2.87 |
| 2 PCS Universal 325mm Wood Main Rotor Blade for Trex 450 RC Helicopter White New | |
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$0.99 Time Remaining: 2d 3h 10m |
| E Flite EFLH1324 Tail Rotor Blade Prop Blade SR New | |
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$1.87 Time Remaining: 25d 14h 32m Buy It Now for only: $1.87 |
| 4 Plastic 160mm Main Rotor Blade for ESKY EK1H E020 Big LAMA RC Helicopter Black | |
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$0.99 Time Remaining: 2d 3h 12m |
| Blade MCP X KBDD Orange Extreme Main Rotor Blades | |
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$8.99 Time Remaining: 4d 12h 49m Buy It Now for only: $8.99 |
| 2 X New 325mm Glass Fiber Main Rotor Blade for Trex 450 RC Helicopter RedWhite | |
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$5.99 Time Remaining: 2d 3h 12m |
| 4x TNS002 325mm Carbon Fiber Main Rotor Blades for 450 SE V2 SPORT PRO S | |
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$19.09 Time Remaining: 3d 11h 57m Buy It Now for only: $19.09 |
| 2 Pcs 275mm Wood Main Rotor Blade for Esky Honey Bee King 2 RC Helicopter White | |
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$0.99 Time Remaining: 2d 3h 12m |
| 430mm Carbon Fiber Main Rotor Blade for Trex 500 | |
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$11.49 Time Remaining: 1d 17h 8m Buy It Now for only: $11.49 |
| 2 X 205mm Carbon Fiber Main Rotor Blade for Trex 250 3D RC Helicopter White New | |
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$7.99 Time Remaining: 2d 3h 12m |
| Blade MSR MSR X Rakon CNC Main Rotor Hub Red MSR010 R | |
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$15.99 Time Remaining: 24d 13h 58m Buy It Now for only: $15.99 |
| 2 PCS 290mm Universal Main Rotor Blade for Walkera 36 60 68 RC Helicopter Black | |
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$0.99 Time Remaining: 2d 3h 12m |
| 4x 325mm Carbon Main Rotor Blade RC Helicopter Trex 450 | |
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$18.99 Time Remaining: 8d 20h 40m Buy It Now for only: $18.99 |
| 2 X 325mm Glass Fiber Main Rotor Blade for Trex 450 RC Helicopter YellowBlack | |
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$5.99 Time Remaining: 2d 3h 12m |
| Main Rotor Blade 001 For QS8005 King size Helicopter | |
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$7.48 Time Remaining: 3d 15h 6m Buy It Now for only: $7.48 |
| Main Blade Parts for HCW 8500 Sky King RC Helicopter Spare Rotor Blades | |
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$0.98 Time Remaining: 2d 3h 30m |
| F00897 4X 425MM 430 Glass Fiber Rotor Main Blade 500 | |
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$18.50 Time Remaining: 19d 17h 29m Buy It Now for only: $18.50 |
| Eflite Blade CX 2 3 swashplate rotor head bearing shaft EFLH1240 1246 1244 1245 | |
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$46.00 (19 Bids) Time Remaining: 2d 5h 37m |
| NEW 8x SH X8 Pro 8827 Main Rotor Blade A B + FREE GIFT Tail Blade FOR 8827 1 | |
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$15.98 Time Remaining: 27d 15h 2m Buy It Now for only: $15.98 |
| Hornet II By MS Composit with Many Aluminum Upgrades Spare Rotor Blades | |
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$130.00 Time Remaining: 2d 9h 24m |
| Blade BLH3117 Tail Rotor 1 Blade 120 SR 120SR New | |
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$1.87 Time Remaining: 24d 18h 17m Buy It Now for only: $1.87 |
| Blade BLH1615 Wood Main Rotor Blades Set 325mm 325 mm Blade 450 400 New | |
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$0.01 Time Remaining: 2d 10h 3m |
| HM CB180 Z 01 Walkera 180Z V200D01 D Q Main Rotor Blade | |
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$3.98 Time Remaining: 16d 12h 17m Buy It Now for only: $3.98 |
| 3D Carbon Fiber Tail Rotor Blades for T rex 450 | |
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$0.10 Time Remaining: 2d 10h 8m |
| 2pair 325 carbon Rotor Main Blade for align 450 rc heli | |
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$12.00 Time Remaining: 6d 22h 59m Buy It Now for only: $12.00 |
| E Flite Blade SR Main Rotor Blade Set White EFLH1518 | |
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$5.00 Time Remaining: 2d 10h 16m |
| E Flite Blade 120SR Xtreme Complete Metal Rotor Head | |
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$61.99 Time Remaining: 25d 8h 57m Buy It Now for only: $61.99 |
| 325MM Glass Fiber 450 Rotor Main Blade | |
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$0.10 Time Remaining: 2d 10h 31m |
| Blade BLH3115 Rotor Head Linkage Set 4 Blade 120 SR New | |
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$2.89 Time Remaining: 4d 2h 27m Buy It Now for only: $2.89 |
| 4 pairs 325mm Glass Fiber Main Rotor Blade for Trex 450 V2 SPORT PRO | |
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$0.10 Time Remaining: 2d 10h 34m |
| Blade mcpx rotor head linkages 8 AEORC | |
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$3.95 Time Remaining: 15d 2h 24m Buy It Now for only: $3.95 |
| 205 carbon Rotor Main Blade for align 250 rc helicopter | |
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$0.10 Time Remaining: 2d 11h 2m |
| RH25072 1pairs 205mm REAL CARBON fiber Rotor Main Blades Trex 250 S | |
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$8.89 Time Remaining: 24d 16h 47m Buy It Now for only: $8.89 |
| F01168 Main Rotor Blade S107 S105 for Syma S107G S105G Metal Alloy Helicopter | |
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$1.75 (14 Bids) Time Remaining: 2d 13h 3m |
| Rotor Blades Spare Parts for Yellow Syma S107G S107 Remote Control RC Helicopter | |
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$2.77 Time Remaining: 20d 9h 16m Buy It Now for only: $2.77 |
| Hirobo SF main rotor blades | |
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$15.00 Time Remaining: 2d 19h 55m |
| Blade BLH3116 Main Rotor Blade w Hardware Blade 120 SR | |
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$5.79 Time Remaining: 25d 22h 47m Buy It Now for only: $5.79 |
Flow Meters - Understanding Helical Rotor Performance
There are many reasons for selecting helical rotors over that of flat-bladed rotors. The helical blade transfers energy more efficiently from the flow stream to the rotor, producing a faster speed of response to flow changes (2-3 mS depending on the rotor mass and blade area).
Helical rotors also minimize rotor slip in flow startup or stop, representing more accurately the actual flow rate being measured. This is important if you have a fluid measurement requirement that is cyclic or involves short flow bursts, such as in hydraulic applications. Helical rotors have less fluid force on the bearing, which reduces friction and heat, extending the life of the bearing.
When using flat-bladed rotors, it is often a common practice to bend the tip of the support to "trim" the flowmeter. Trimming is a term meaning that the flow is directed to the rotor blade at an angle to achieve improved linearity in one direction. In addition, this will increase flow resistance and pressure drop across the flowmeter. The bent support will also want to rotate if not properly clamped.
Helical rotors do not require bending the supports to enhance the linearity.
Dual-rotor Turbine Concept:
- Unconditioned flow enters flowmeter.
- Straightening vanes smooth the flow as it enters the first rotor.
- Flow transfers momentum to the first rotor, making it spin counterclockwise. Flow then exits rotor, with a clockwise spin.
- Flow enters second rotor with a nearly perpendicular angle of attack, thereby transferring additional momentum to the second rotor. This additional momentum, results in greatly extended turndown.
- Flow exits flowmeter.
- Dual pickoffs transmit the rotor frequency signal to remote instrumentation.
Dual-rotor Performance Advantages:
- Wider flow ranges – up to 500:1
- No flow straighteners required
- High shock design
- Enhanced repeatability and overall accuracy
About the Author
Exact Flow, based in Scottsdale, Arizona USA, is the only supplier of innovative dual-rotor turbine flowmeter technology, delivering unique designs to meet the application requirements of the aerospace, industrial, automotive and OEM markets. Exact Flow's primary focus is to enhance customer value by specializing in advanced embedded electronics, multiple process variable measurements and unique packaging, which minimizes the need for additional sensors and installation expense.
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