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Forums » General Discussion » The Water Cooler » For all the Pilots / WWII Buffs . . .
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#377283 - 05/28/12 11:32 AM
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![]() President connoisseur ![]() Registered: 03/13/01 Posts: 1146 |
I believe the P47 is the fixed gear version of the Harvard.
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Ian Colquhoun President & Chief Engineer |
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#377285 - 05/28/12 11:38 AM
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![]() connoisseur ![]() Registered: 11/08/05 Posts: 1235 Loc: Millis, MA |
No floor?
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M3 and M80 |
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#377287 - 05/28/12 11:48 AM
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![]() shareholder in the making ![]() Registered: 09/27/04 Posts: 11437 Loc: Central NH |
Ahhh, so I still have an eye for these things!
![]() Thanks, Ian!
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::::::: No disrespect to Axiom, but my favorite woofer is my yellow lab ::::::: |
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#377288 - 05/28/12 11:49 AM
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![]() shareholder in the making ![]() Registered: 09/27/04 Posts: 11437 Loc: Central NH |
Wouldn't stop most of the AA flak anyway, so why add the weight?
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::::::: No disrespect to Axiom, but my favorite woofer is my yellow lab ::::::: |
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#377292 - 05/28/12 12:22 PM
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![]() axiomite ![]() Registered: 12/27/08 Posts: 6873 Loc: It's all about the location. |
Also helps if you need to take a .....
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Half of communication is listening. You can't listen with your mouth. |
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#377293 - 05/28/12 12:30 PM
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![]() shareholder in the making ![]() Registered: 05/03/03 Posts: 18044 Loc: NoVA |
Cool stuff. Incidentally, I was told by a fantastic docent at the Air and Space Museum in Dulles that the Huey's unique sound is also because the ends of the blades go supersonic.
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I am the Doctor, and THIS... is my SPOON! |
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#377296 - 05/28/12 01:30 PM
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![]() aficionado Registered: 11/16/10 Posts: 901 Loc: Victoria,BC |
Originally Posted By: Lampshade No floor? That's so you can get up to speed on the runway. |
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#377297 - 05/28/12 01:41 PM
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![]() shareholder in the making ![]() Registered: 09/27/04 Posts: 11437 Loc: Central NH |
Yabba Dabba Doo!
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::::::: No disrespect to Axiom, but my favorite woofer is my yellow lab ::::::: |
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#377303 - 05/28/12 02:48 PM
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![]() axiomite ![]() Registered: 02/26/05 Posts: 5210 Loc: Vero Beach, Florida |
Originally Posted By: MarkSJohnson That's awesome Ian! For those that know about these things: Is this plane related to the P47? That's what this looked like to me..... Originally Posted By: Ian I believe the P47 is the fixed gear version of the Harvard. Are you guys referring to the P47 Thunderbolt? If so, it is no relation whatsoever to the Harvard. The Harvard is a variant of the T-6 Texan and I believe the aircraft Ian is maybe thinking about is the predecessor to the Texan/Harvard, either the BT-19 or BT-15? The P47 Thunderbolt is powered by a Pratt & Whitney R2800, 2,500HP radial engine and has speed around 400+ mph, the P47 was used primarily as a successful ground attack aircraft in Europe. With WWII aircraft any aircraft with a 'T' designation was a trainer (T-6, BT-19 and etc..) 'P' designated Pursuit (P47, P51 and etc..) which was later changed to 'F' for fighter. BT19... ![]() BT15... ![]() And P47... ![]() |
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#377306 - 05/28/12 03:05 PM
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![]() axiomite ![]() Registered: 02/26/05 Posts: 5210 Loc: Vero Beach, Florida |
Originally Posted By: Ken.C Cool stuff. Incidentally, I was told by a fantastic docent at the Air and Space Museum in Dulles that the Huey's unique sound is also because the ends of the blades go supersonic. I don't believe that's entirely true Ken, although aircraft and helicopter propellers can go supersonic they aren't designed do so and become very inefficient at supersonic speeds. We'll have to ask Tom (exlabdriver) but it is my understanding that the advancing blade (the upwind blade of a forward moving helicopter) is limited in speed so that it will not go supersonic. I believe the unique sound from the Huey is due to the width and length of the blades rather than them going supersonic. Ken, here is a simple explanation... 'Because the blade is rotating, and not flying straight into the air, then the outer tip will be moving through the air faster than the base. In fact, the airspeed of the blade will increase as you move out. So what will happen is that the tips of the blades will be the first to reach mach 1. A shock wave will form at the tip of the blade. As the blade increases rotational speed, the shockwave will move along the blade as more of the blade goes supersonic. The big problem with this is that the blades really aren't designed to withstand the stresses of supersonic travel. They will end up disintegrating. It also means that a portion of the blade will be 'transonic' (at or near the speed of sound). In this region there are problems with airflow and controllability, which will severely hamper the performance of the blade. Loss of lift and poor control will be major symptoms. Noise is the other issue.' Edited by RickF (05/28/12 03:17 PM) |
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