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![]() Quote:
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post number 5 Quote:
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http://canardaviationforum.dmt.net/showthread.php?t=633 berkut construction This is what i know on mach tuck
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Enjoy the build,njut av byggandet, godere il costruire, nyd bygningen, geniesse den Bau, apolafse tin kataskevi, disfrute la construcción, curta a construção, Pidä hauskaa rakentamisen parissa, bouw lekker,uživaj grade?inaslajdaites postroikoi, geniet die bou dust maker of wood, fiberglass, foam dust, metal bits and one day a Cozy will pop out and swiftly whisk me from meeting old friends and family to adventures throughout the world |
#2
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![]() A number for critical mach was calculated recently by Todd Parker on the mail list. Here's a snippet.
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Michael LaFleur Turbo Rotary Big EZ Retract And no trees were harmed or killed in the creating and sending of this message. However, a large number of electrons were terribly inconvenienced... http://banners.wunderground.com/weat...ions/76225.gif http://banners.wunderground.com/weat...ions/76225.gif |
#3
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![]() A response by Marc Z:
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I hpoe you don't mind my quoting you Marc. I can remove if you so desire.
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Michael LaFleur Turbo Rotary Big EZ Retract And no trees were harmed or killed in the creating and sending of this message. However, a large number of electrons were terribly inconvenienced... http://banners.wunderground.com/weat...ions/76225.gif http://banners.wunderground.com/weat...ions/76225.gif |
#4
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![]() MMm, interesting computations, but, as Señior Riley is closer to the subject, i would tend to put more weight in his calcs and experience
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Enjoy the build,njut av byggandet, godere il costruire, nyd bygningen, geniesse den Bau, apolafse tin kataskevi, disfrute la construcción, curta a construção, Pidä hauskaa rakentamisen parissa, bouw lekker,uživaj grade?inaslajdaites postroikoi, geniet die bou dust maker of wood, fiberglass, foam dust, metal bits and one day a Cozy will pop out and swiftly whisk me from meeting old friends and family to adventures throughout the world |
#5
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![]() For certified aircraft Mach tuck affects have to be considered starting at .42mach. There is an interesting article on it in the latest Flying magazine. It discusses why the Columbia 400 has a lower VNE than some less capable certified airplanes. They went over mach .42 at 25,000, and had to redo all their speeds....
Mark |
#6
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![]() Quote:
You also made another interesting comment Quote:
Sorry - I know this thread is on mach tuck, but they're related subjects. |
#7
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![]() From Cozy Newsletter #5, a more innocent time, with a GU canard:
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Mark Spedding - the Spodman Darraweit Guim, Australia Theoretical Cozy IV 1331 - Celebrating 2 years of not building anything ![]() |
#8
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Let's go to the horse's mouth: "A California VariEze, travelling through Arizona was destroyed in a weather related accident. The pilot and passenger were both fatally injured. The weather was reported at 500 foot ceiling, poor visibility in sleet and freezing rain. The aircraft totally disintegrated in the air. Very little damage was due to the impact with the ground. We spent a lot of time looking for possible causes, and we carefully examined all of the pieces which were found. The wreckage was spread down wind for over two miles. The damage showed signs of extreme high speed flutter, rather than overload due to excessive g. This accident was probably caused by the pilot pushing on into bad weather, or possibly trying to climb over bad weather. He may have become disoriented or overcome by hypoxia, the aircraft probably ended up straight down at very high speed. Finally it reached a speed beyond anything intended for this design, when it literally experienced flutter over the entire airframe. The important point to note is that there was no evidence of a massive 'g' overload, such as would be expected if the pilot tried to pull out of a high speed dive, was found. All of the evidence points to total catastrophic failure due to high frequency, divergent flutter. The damage could only have resulted from and extreme overspeed condition possibly in the region of 400 knots plus." So, the number 400 kts is merely "possible". It could possibly have been 300 Kts, or 450 kts, or any other number greater than whatever speed V.E.'s have been tested to. Plus, since the V.E. structure is substantially different (at least in the wings) than the COZY/L.E. structure, I'm not at all sure that I would use this guess as an indication of anything in particular.
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#9
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![]() Quote:
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Mark Spedding - the Spodman Darraweit Guim, Australia Theoretical Cozy IV 1331 - Celebrating 2 years of not building anything ![]() |
#10
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![]() mmm looks like someone else is aimin to go high and fast, in this issue of CSA news letter marc warns that he knows someone that thinks they can go 210 Knots IAS at 25,000 with a turbo canard, and that may be the speed that mach tuck can occur.
Wish i thought i had a chance of going that fast, if i make it to 200 MPH IAS at 25000 I'll be happy, overjoyed. 210 Knots is 241 MPH, but if i can cruise at 230 MPH IAS at 25000, I'll hold it at that! heh heh heh just a little math 200 mph IAS at 25000 is roughly 300 MPH TAS 210 knots IAS at 25000 is roughly 315 Knots TAS or 362 MPH TAS !
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Enjoy the build,njut av byggandet, godere il costruire, nyd bygningen, geniesse den Bau, apolafse tin kataskevi, disfrute la construcción, curta a construção, Pidä hauskaa rakentamisen parissa, bouw lekker,uživaj grade?inaslajdaites postroikoi, geniet die bou dust maker of wood, fiberglass, foam dust, metal bits and one day a Cozy will pop out and swiftly whisk me from meeting old friends and family to adventures throughout the world |
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