Aces High Bulletin Board
General Forums => The O' Club => Topic started by: Flench on July 02, 2010, 09:14:04 AM
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You guy's seen this ?
http://www.youtube.com/watch?v=kO7BuPG_vVo
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Wow! That's about as close to crashing as you can get without actually crashing.
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Unreal...Good example of an accelerated stall. That's a one-in-a-million recovery there.
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bah thats nothing, i've done it in a mosquito before :D
here is another good clip about matt hall. http://www.youtube.com/watch?v=5CB27K-wIsM&feature=related
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Obviously a talented pilot, but there was a huge amount of luck in that recovery.
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Unreal...Good example of an accelerated stall. That's a one-in-a-million recovery there.
do a search for the race in perth. there was an identical stall, and he didn't recover. he hit the water wings level.....no injuries...........there's even a slow motion of the tail camera, where you can see the onset of the stall, just before the aircraft tries to over-rotate from the stalled wing.
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Wish those skills worked with AH trees.
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do a search for the race in perth. there was an identical stall, and he didn't recover. he hit the water wings level.....no injuries...........there's even a slow motion of the tail camera, where you can see the onset of the stall, just before the aircraft tries to over-rotate from the stalled wing.
Wow. Two identical incidents in the same aircraft type. Looks like a trend. I guess there is such a thing as too much elevator authority?
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Now those both were The Close Call :O
OT
Is there a Red Bull Air Race videos, from where you see the speed, G's and possible a altitude data real time?
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Wow. Two identical incidents in the same aircraft type. Looks like a trend. I guess there is such a thing as too much elevator authority?
yea. i think it's more like they're riding so close to the edge, that even just a shift in the wind, can cause this type of incident.
i think on redbull;s site, there's another one of a similar "near" stall, on the entrance to the race course.......the pilot even said in the interview, that he tried to adjust and pulled a little harder i think.
i also do not believe that there was any luck involved in either of those incidents.......it was pure skill of the pilots.
linky
http://avstop.com/news_april_2010/red_bull_air_race_plane_crash_in_perth_pilot_adilson_kindlemann_ok.htm
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i also do not believe that there was any luck involved in either of those incidents.......it was pure skill of the pilots.
Actually, I think its the design of the aircraft. Obviously they both suffered from tip stall, and if wasn't for those full span ailerons, neither of them would have been able to get the aircraft to hit flat.
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Actually, I think its the design of the aircraft. Obviously they both suffered from tip stall, and if wasn't for those full span ailerons, neither of them would have been able to get the aircraft to hit flat.
Any idea about the symmetrical airfoil type they are using?
I remember once the TV race commentator was mentioning something about the high lift profile wings on those air-race planes.
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Actually, I think its the design of the aircraft. Obviously they both suffered from tip stall, and if wasn't for those full span ailerons, neither of them would have been able to get the aircraft to hit flat.
you could be right. did you watch the race at nj, over the hudson river? a couple of the guys have winglets on their aircraft now. it didn't seem to give them any distinct advantage though.
what i did notice, was serious energy management. there were a couple of guys with admittedly underpowered aircraft(for this type of racing) that were VERY competitive, simply by flying much cleaner.
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Any idea about the symmetrical airfoil type they are using?
I remember once the TV race commentator was mentioning something about the high lift profile wings on those air-race planes.
Totally unscientific, but from pictures, it appears to be a straight slab, turbulent airfoil. I'd guess its probably close to a NACA 0012 or 0015. Its almost certainly a custom design, but appears to be simple.
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Totally unscientific, but from pictures, it appears to be a straight slab, turbulent airfoil. I'd guess its probably close to a NACA 0012 or 0015. Its almost certainly a custom design, but appears to be simple.
Thank you for your information.
I was checking with the Profil the polars a bit (Re500000):
(http://fdm4bge.1g.fi/Files/10001/BGE_AirRace/RBAR_clcd.png)
(http://fdm4bge.1g.fi/Files/10001/BGE_AirRace/RBAR_clcd_a.png)
I understood, the Eppler 472 is a typical aerobatic airfoil with good Cl at high AoA aplus very gentle stall characteristic.
The NACA 0012/0015 seems to be more for the speeding, right?
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From the picture, that Eppler airfoil is probably closer.
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From the picture, that Eppler airfoil is probably closer.
Yes, it's actually looking like Eppler modification from the wing tip section
(http://fdm4bge.1g.fi/Files/10001/BGE_AirRace/RBAR_MHT.png)
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Looked like maybe a tiny bit of a tip-stall or maybe a twitch on the rudder pedals that over-rotated him.
I saw another one just as bad, on a course in the desert with towering rock formations. A little (200 ft tall) rock pedestal had the gates on it, and the approach to that gate was a turn where most competitors were pulling around 10 Gs. The guy gloc'd around the turn and did a bounce-and-go off of the rock pedestal while still recovering from the gloc, and came just a few ft from plastering himself straight into the side of the rock.
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Actually, I think its the design of the aircraft. Obviously they both suffered from tip stall, and if wasn't for those full span ailerons, neither of them would have been able to get the aircraft to hit flat.
Earlier in the video clip there were at least 2 spots where it looked at first like he was just over-using the rudders to help the plane turn, but on second view maybe he is using the tip-stalls on purpose to help roll (sort of like short 90-deg snap rolls) but the plane was twitchy enough that it snapped on him when he didn't want it to, halfway through what should have been a stable high-G turn.
But look at the rest of the vid... His plane does a lot of wiggling around and my read was that he was either really standing on the rudders to help roll, or he was tip-stalling an awful lot, maybe on purpose.