Many propellors break the speed of sound. Think about it. The plane is moving 500mph and the speed of sound is as low as 630 mph. Even the popular Beaver bush plane has tips going supersonic. The way to go faster is to use more blades on the propellor and make them shorter or have contrarotating props.
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.
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.
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, 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.
Nice shot and perfect sky! Must have been during qualifications without the usual Air Show announcers - just engine and prop through the back stretch!
Hey John. Very cool.
daveherman505 4 months ago
My Good, that"s a Bulet .
chinagilb 2 years ago
Leroy Grumman would be proud
yakovlev3a 2 years ago
what was the speed please.
tj
terryjohn 2 years ago
735mph... just shy of the speed of sound.. Kidding! Not sure but it had to bear near 500MPH
WakeUpDummies 2 years ago
da bear is the fastest piston plane in the world i am sure john did not have the throttle all the way up
rarebearfan 3 years ago 2
damn that was sexy!!!!!!!!!!!! Right on!!
braydomzo 3 years ago
great film angle
gusthepugisownt 3 years ago
Those prop tips are trans sonic all the way. I doubt you could make that plane go any faster with a conventional prop.
IK1963 3 years ago
Many propellors break the speed of sound. Think about it. The plane is moving 500mph and the speed of sound is as low as 630 mph. Even the popular Beaver bush plane has tips going supersonic. The way to go faster is to use more blades on the propellor and make them shorter or have contrarotating props.
Chopin742 3 years ago
Think about it. The forward speed of the aircraft has nothing to do with the prop tip speed. Or you never heard of pitch?
IK1963 2 years ago
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.
Chopin742 2 years ago
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.
gethmord 2 years ago
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!
Chopin742 2 years ago
@Chopin742 copy - paste.
jakko12345 1 year ago
Exactly
WakeUpDummies 2 years ago
Um, that is fast! Very fast for a propeller plane.
WranglerSlim 3 years ago
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
I agree
gusthepugisownt 3 years ago
Nice shot and perfect sky! Must have been during qualifications without the usual Air Show announcers - just engine and prop through the back stretch!
Kauzmic 3 years ago
Alright!
kitam1 4 years ago