This is why we tell you to ALWAYS stand behind the prop arc before revving your engine!

[youtube]http://www.youtube.com/watch?v=2ZwPADjNQCA[/youtube]

This guy got VERY lucky to get out of that with a scrape and a lump... Tha could've been MUCH WORSE!

Good morning, Mike.

Thank you very much; perfect example!

Extremely lucky person this gentleman is,...........and the rpm's were not high,..............and the prop was not big............[sm=75_75.gif]

"The superior man, when resting in safety, does not forget that danger may come. When in a state of security he does not forget the possibility of ruin. When all is orderly, he does not forget that disorder may come. Thus his person is not endangered, and his States and all their clans are preserved." Confucius

And please note that the prop did not hit the ground, nor did anything fall into the prop - it just met its expiration date, and you NEVER know when that is going to happen!

I see it all the time, usally on lookers .
I tell them you may want to get behind
the prop.

Thanks for posting Mike.

Bob

That would have hit me right on the pacemaker/defibrillator

He sure was trying to get the last ounce of RPM from the engine. I heard him hunt for the "too lean" part of the adjustment and shortly after is when it threw the blade.

No more power than a Cub needs, He should have been worried about the low speed?

Even though he was speaking Norwegeon, I very well understood the first word he uttered after the flutter sound.

I've had some come off but they never hit me as I was always on the other side.

I tell them "You MUST get behind the prop"

I don't care if it's an on-looker a club member or the Queen of Sheiba, if anyone is not behind the prop arc, I don't go above idle.

The prop was on the small side for a OS 120?

Most probably had a fractured blade before he started it?

[]minn flyer
thank for the video very educational i guess your never to old to learn?

The camera man must not of been to bright either being in front of the cub.

The guy adjusting the engine is lucky he didn't lose an eye.

The good thing is, it didn't do any damage to the cub!

big dan

http://rcuvideos.com/video/Prop-spin-off-MPG

This was mine for education
The prop was in good shape, until it came off. It only took a little chip out of the tip. The prop ended up about 25 - 30 feet away, the prop nut was about 75 feet across the runway.

Thanks for the reminder. I know first hand how things can get out of control. I once had a 11x6 folding prop break loose, as always I was behind the glider when it broke loose.

I guess "S__T" means the same thing in many lanquages!!!!!!!!!!

Wow! I had no clue anything like that could happen... Note taken!

Hi!
Too small prop, too high rpm ...probably a Ma prop!

That can happen with any prop and at any RPM - it's just that the faster it's going, the more damage it can do! (like maybe going into your brain instead of just putting your eye out)

Go back and look at the video again ( a couple times ) this guy was an accident looking to happen. I'd drop a STUDENT yesterday if they did all the mistakes made in this video. ENJOY !!! RED

Using an Engine Starting Safety Stand instead of starting it on the ground can add a degree of safety. We have ten at our club. Free plans can be downloaded from the Download section of http://www.wilsonrc.org/news.php

I saw something similar happen to a helicopter. Those blades DO FLY!!!! When it came apart, one of the fragments flew over our heads in the pits.

CGr.

.........or not..........[sm=bananahead.gif]

the youtube inbeds aren't working? well here anyway. I saw a fourstroke backfire, and kick a prop off once ..slapped the guy starting it right on the face..he was lucky it didn't go in like a knife..I also witnessed a KNOW IT ALL starting a plane in pits..( he knew better)..the prop popped off and almost ran forward about 4 feet and sort of spun and hopped in the dirt, smacking his field box a few times..it was like something out of a cartoon...

I wont even attach the glow driver from the front. I heard of a guy who put his glow driver on a never ran Saito and it started on it's own. I guess thats possible if its on the compression stroke. Being a creature of habit I have a routine. I fill the tank and prime the engine. Then I turn the prop way back to just after compression stroke. (I only use 4 strokes). Then Ill get behind prop before I turn on the TX and RX and hook up the glow driver. 99% of the time I'm flying with a bud and Ill have him hold the plane from behind so I don't have to reach over the props arch to hold the plane while applying the starter. The inside of the forearm has some pretty big arterys and I want all the blood I got!

Never remove the glow igniter from the front of the plane and never adjust the needle from the front of the plane. And be extra carefull with big 4 strokes. Sometimes they start up running backwards and Ive had a 15" prop, spinner and all back off and fly 30'.

That dude in the video is crazy. He had his face right down there in front of the prop more than once wearing what is probably glass sunglasses. If that broken prop would of hit him in the eye at that range, it could of drove glass and prop into his brain killing him.

wow, finally watched video, man it scares me to be in the prop arc at ANY time ..and this proves why. he was lucky..

I had a friend loose a 28" carbon prop at full rpm on the ground. Nobody hurt, but real scarry. Ripped the front of the plane to pieces from the vibration and could of killed somebody. Spinner came loose and knicked the prop, thats all it took.

I was using one of those "safety" stands when the neck strap from myradio blew into the prop. Something suddenly stung me on the hand. It happened so fast I didn't see it. I looked around and there was my neck strap about 30 feet away. The transmitter never moved, thankfully. It could have been destroyed. The motor kept running also, didn't even hear an RPM drop.