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Old 06-20-2012, 02:04 PM   #1
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X3 helicopter

262mph first time in the USA today in dfw Texas very cool il try to add pics
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Old 06-20-2012, 04:02 PM   #2
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Eurocopter
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Old 06-20-2012, 07:28 PM   #3
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That thing looks preaty cool.........
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Old 06-20-2012, 09:32 PM   #4
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There's a fundamental physics problem with helicopters. As airspeed gets higher, the advancing blade (the one turning into the chopper's airspeed) gets closer and closer to Mach 1.0 - adding the rotor's speed to the forward speed of the chopper.

The retreating blade simulatneously gets closer and closer to stalling speed. If the retreating blade actually stalls, most of the lift on that half of the rotor disc is lost. Helicopter then does a snap roll to the left and falls out of the sky.

On most helicopters, the phenomenon occurs at somehwere around 220 knots, less on 2-bladed ships like the Jet Ranger, since the blades are longer. This is the typical failure involved in "unexplained" crashes of Medevac helicopters that are rushing to the scene of the incident.

Getting to 250 knots is a major achievement.
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Old 06-21-2012, 05:02 AM   #5
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This has 5 props to help with this 264 mph at 80 percent power it going to Huntsville Alabama for a show friday
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Old 06-22-2012, 10:58 AM   #6
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Looks like a very, very advanced gyrocopter.

Sikorsky X2 = 260kts (299.2 mph).

Frank, you are correct....all the right torque pedal in the world doesn't help.

Actually very exciting stuff !!

Kerry
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