This is a short video to describe the mechanics of helicopter mast bumping. Mast bumping is a hazardous condition that can occur in helicopters with teetering rotors if the helicopter is flown out of the envelope.
A separate, follow-on, video will describe the maneuvering conditions that can lead to this hazardous event.
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Isso deveria ser proibido ser comercializado uma máquina extremamente perigosa
Ok
Mast bumping, all the kids are doing it. 😂
❤❤❤❤❤❤❤ exlent technology
Muito bom iso min ajuda muinto
Which makes that recent video of someone flogging a Robinson so cringe.
Commercial Instrument Pilot for over 50 years (78 years old). A few months ago, I decided to take helicopter flying lessons just for the fun of it. I was told in the strictest terms to not make large control inputs but to fly with my fingertips. I was in an R-44 BTW. Airplane and helicopter flying is entirely different. Great time and I did learn to hover.
❤️ zz WW2 l3
Real pilots: "Fly or land. Try to have fun and you die"
Colin McCrae "I got a flying BMX"
So we’re going to double down on teetering rotor heads and blame it on the pilots! Just crazy.
The big ones: low-g pushovers, and “riding the parabola.”
Going low-g and pushing the nose forward over (they literally have a sticker on the yoke forbidding you from doing it), will tend to want to force the advancing blade down and tilt the rotor disk right while the helicopter rolls left.
“Riding the parabola” and staying low-G on a climb and crest – differential lift forces coming off the tail boom will tend to roll the helicopter (usually left for Robinsons) without tilting the rotor disk plane – and the natural tendency for a pilot in an uncommanded roll is to try to correct – quickly pushing the already canted disk even closer to the flap stops.
A simple phrase to stay in-envelope easier: “keep it loaded, or keep it centered – and keep your butt in the seat.” (maintain positive Gs near 1G)
Do I get my SFAR 73 cert now?
You also have blade flex which given enough flex can chop the tail boom off.
Ban teetering rotors. Remove all Robinson helicopters type ratings, even if it causes lawsuits and makes the helicopters lawn ornaments.
All this teetering, flapping and bumping talk is not helping me believe helicopters can fly.
Very well said ! Is low rotor rpm or low g loads that lead to the problem however how about the shaft bending frequency ?
Crazy.
FIND A GODDAMN HIGH SCHOOL DROP OUT AND LET HIM FABRICATE A GODDAMN SET OF STOPS FOR THE GODDAMN THING. TRUMP NATION MAGA🇺🇸🇺🇸🇺🇸🇺🇸🇺🇸
Sounds to me like the engineers are just being lazy. You could easily design a limiter with high force impact resistance that would solve the issue and allow for almost constant "pushing the limit"
So dont touch a Robinson
Realy enjoyed your animations and presentation thank you
Is 12 degrees the limit as any angle beyond 12 degrees would be unrecoverable regardless.
Or is 12 degrees the limit due to space if so could the spindle be ditched in favour of fork ended rotor joints meaning 2 bolts to mount each rotor but more room for the mast.
Could the purple part reverse lift when it goes beyond 12 degrees pushing the spindle back onto the mast?
Or a leaf spring coming out of the end of the rotor down into the shaft that is free until 12 degrees or zero g.
Or have a slide at the top of the drive shaft so when it's parked or at zero g the spring holds it away but as soon a lift is generated the hub slides up a touch and zero contact.
👍
Merci.de.bonne.ide'.cet.le même système.du.auto.ggyro
👏👏👏👍
❤️
Great video. 👏
I was a military helicopter pilot and never got taught about mast bumping. Doesn't happen in proper helicopters. Just those cheap piston engine helicopter.
Expensive lawn mowers. If you're hanging in the sky please give yourself a jet engine and a proper rotor head. Robinsons are crashing left right and centre.
What a great video. Very clear and the color helps!
This killed a pilot in Australia a while back. The manufacturer has now added a wing to prevent turbulent air from being able to do this, and the resulting roll over that can occur.