rick(at)rvairshows.com
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 Posted: Sun Oct 25, 2009 4:09 pm Post subject: Fwd: GT propeller blades on V530 hubs |
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To M14P owners:
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I have tested the new GT prop blades in 250 length on a Sukhoi SU26M against V-530 blades, MTV3-250, MTV9-260-29. The following tests were the average of 3 trials. The GT propeller blades offer a good alternative for Yak and CJ operators who need replacement blades on the V530 hubs, or to significantly improve performance over the V530 blades at a cost that is half of a new MT three blade prop. Combining static thrust approaching an MTV 9-260, the same top speed of the V530 propeller, and less vibration, this cosmetically beautiful blade should appeal to many of your customers. The design is a wood core with 3 layers of carbon fiber. The GT propeller company is making propeller blades for 1700 h.p. warbirds , proving that their engineering can handle any size job.. This company has been around for many years in Italy and is now beginning to distribute to North American markets. The cost of the GT 250 blades for the V530 hub is 5752 Euros, including 3 day UPS shipping to the United States. The conversion to US funds is $8428.00. Please view the GT propeller website: gt-propellers.com
I have been authorized to sell these blades for GT. If you would like more information, contact me at:
Rick Volker Airshows
6916 Buffalo Ave.
Niagara Falls,NY 14304
716-713-3904
Test Results:
Max level speed: mtv3=gt= v530=330kph
Mtv9 slower by 10 kph
Max cruise: mtv3=gt=v530=305kph
Mtv9 slower by 8 kph
Full power stall speed: V530=65 mph,mtv3=60 kph
Gt=50kph , MTV 9= < 50 kph(hovering possible)-below measurable airspeed
Vertical penetration from 6G pull,330kph:
V530=1600', mtv3=1700', GT=1700',Mtv9=2000'
Time on vertical line: v530=17 second. Mtv3=20 second. GT=20 seconds.MTV 9= >30 second (hovering).
Time to climb 1000' to 2000': v530=20 second.
GT= 20 second., mtv3=17 second, mtv9=17 seconds.
Level acceleration full power, 200kph to 300kph:
V530= 17sec. GT= 17sec. Mtv3=15 sec.mtv9=16 second.
Descent rate at idle with prop at 100%rpm:
Mtv9 =15 sec/1000',GT=32sec/1000',v530=35sec/1000',mtv3= 40sec/1000'
Note: the MTV 9 has longer blades and was optimized for static thrust. It stays much flatter power off, is significantly slower in speed, but will hover this weight aircraft.
The GT has more static thrust than the MTV3 and more thrust from 0 to 120kph. It loses to the mtv3 at 170kph Vy climb and at 200-300kph acceleration, but has same top speed and cruise speed. The GT power off descent rate is high, suggesting the blades stay very flat at power off .
The GT was only static balanced and was much lower vibration than the v530 which had been dynamic balanced. The MTV3 and MTV9 had been dynamic balanced and were by far the smoothest props. It would be conceivable that the GT would be smoother if dynamic balanced. The GT may need a spinner with backing plate to allow dynamic balancing to the same level as a three blade prop. GT is developing a carbon fiber spinner that is 46 cm wide for the V530 hub.
Vertical penetration and time on vertical line upwards were equal with mtv3 vs GT.
From these tests, the GT is as good as the mtv3-250 three blade prop during aerobatics and may be as good an all around prop for aerobatics, travel, and short field take offs. The mtv9-260-29 has been optimized for aerobatics and air shows at the expense of slower cruise, max speed, and poor glide characteristics. It would be advisable to test the GT against the MTV9-250 with both the-27 and -29 blades.
The GT is superior to the v530 in static thrust, vertical penetration, power on stall, and vibration. It is equal in climb, midspeed acceration,cruise,and top speed. The GT has a slightly worse power off glide than the v530. There is also more propeller braking with the GT than with the V530 on roll out after landing.
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