Today's Message Index:
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1. 02:17 PM - Re: Yak 55 control balancing (TumblingTiger)
2. 05:09 PM - Fw: GT propeller blades on V530 hubs (Rick VOLKER)
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| Subject: | Re: Yak 55 control balancing |
Fellow 55'rs,
Thanks for the replies to my balancing request. In short for those of you who
are still interested, I have come to the conclusion that there are no published
specs on the balance limits published for after paint for the 55M. If the factory
balance weights are still installed on the Rudder and Elevator, then they
should still be within design specs even after a recover and repaint.
I used the Polly Fiber cover system except for tapes. There I went the extra mile
and used the Double Cover method from Kimball Enterprises (3.4oz then cover
again with 1.7oz), which is most known for their seamless award winning finishes
on the Pitts Model 12. I also went back to the original Russian style rib
stitching as it provided the most seamless results possible. (See Attached
for stitch pattern) For the ultimate finish I had Advanced Aircraft Refinishers
in Griffin, GA shoot the top coats. They are award wining painters and are
known for the finish on the 2007 AOPA aircraft sweepstakes plane. Its definitely
the best wet look I have seen on a plane in a while and the fabric looked
almost like fiberglass when completed.
For the rest of you wondering, yes the back of the prop tips are painted white.
This is a formation flying technique for those who fly tight formation a lot.
Attached are the photos of the finish paint. Now off to trim which will be completed
with high performance 2 mil vinyl.
--------
Mark-
Tumbling Tiger Airshows
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=269375#269375
Attachments:
http://forums.matronics.com//files/sspx0658_641.jpg
http://forums.matronics.com//files/sspx0657_986.jpg
http://forums.matronics.com//files/stiching_diag_181.pdf
Message 2
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| Subject: | Fwd: GT propeller blades on V530 hubs |
To M14P owners:
>
> 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 00'
> Time on vertical line: v530=17 second. Mtv3 second. GT
> seconds.MTV 9= >30 second (hovering).
> Time to climb 1000' to 2000': v530 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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