Rare Bear Pass Reno 2007
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Uploader Comments (interstellardust1)
All Comments (20)
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Hey John. Very cool.
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@Chopin742 copy - paste.
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My Good, that"s a Bulet .
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I'm just talking about the tips at certain times. Even the cessna 152 with a 75 inch propellor spinning at 2550 rpm has tips moving up to--> (2*(3.14159265)*37.5*2550*60)/
(5280*12)=568.967419 mph 2 times pi times radius times rpm times 60 minutes divided by 12 inches and 4280 feet. and a 152 doesn't really have a long propellor or extremely high rpms. I heard about the xf-84, but had no idea it was that loud! -
Actually props are geared to run well under the speed of sound. As they approach supersonic they loose effectiveness. check out the xf-84h thunderscreech. It was an experiment using supersonic props. It was reported that you could hear the plane at up 25 miles away and could knock over a man standing close to it. Edward's ground controllers made them tow it out to the dry lake bed before starting it. Because of the continuous sonic booms generated by the prop.
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It doesn't matter what the pitch is or if the propellor is even spinning. The tip is still going at least as fast as the aircraft. You are only thinking in one dimension. Your vector is higher than the highest component unless they cancel each other out. You weren't paying attention because I pointed out the Beaver as an example and it flies nowhere near 500 knots/mph.
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Think about it. The forward speed of the aircraft has nothing to do with the prop tip speed. Or you never heard of pitch?
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Exactly
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735mph... just shy of the speed of sound.. Kidding! Not sure but it had to bear near 500MPH
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Leroy Grumman would be proud
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Actually, this is Rare Bear's last pass during the Gold Race on Sunday. The shot was taken from the Fenceline in the infamous Valley of Speed courtesy of the Fenceliners and in particular Fenceliner kitam1. thanks Larry.
Yes its a terrific vantage point with no annoying announcers. It was even better when you could get out on the race corse on the front straightaway between pylon 3 and 4. Oh for the good old days... sigh.
interstellardust1 3 years ago