Beginners and experts, please note:
 

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]

RE: Beginners and experts, please note:
 

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

RE: Beginners and experts, please note:
 

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

RE: Beginners and experts, please note:
 

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!

RE: Beginners and experts, please note:
 

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

RE: Beginners and experts, please note:
 

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.

RE: Beginners and experts, please note:
 

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.

RE: Beginners and experts, please note:
 

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

Most probably had a fractured blade before he started it?

RE: Beginners and experts, please note:
 

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

RE: Beginners and experts, please note:
 

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

RE: Beginners and experts, please note:
 

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.

RE: Beginners and experts, please note:
 

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.

RE: Beginners and experts, please note:
 

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

RE: Beginners and experts, please note:
 

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

RE: Beginners and experts, please note:
 

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

RE: Beginners and experts, please note:
 

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)

RE: Beginners and experts, please note:
 

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

RE: Beginners and experts, please note:
 

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

RE: Beginners and experts, please note:
 

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.

RE: Beginners and experts, please note:
 

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

RE: Beginners and experts, please note:
 

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...

RE: Beginners and experts, please note:
 

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.

RE: Beginners and experts, please note:
 

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

RE: Beginners and experts, please note:
 

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.

RE: Beginners and experts, please note:
 

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.

RE: Beginners and experts, please note:
 

Just amazing![sm=what_smile.gif]

Those stands are safe; however, the one in my picture above forces the pilot who uses the stand for the radio to stand within the dangerous zone.[sm=thumbs_down.gif]

RE: Beginners and experts, please note:
 

We all become to complacent after a while. We all need to remind one another when we see a unsafe condition. I have seen guys firing up these "flying circular saws" with thier kids standing right in line with the prop. If you take the time to look around at your club and tell the members when there is a unsafe condition, YOU WILL BE A BUSY MAN!

RE: Beginners and experts, please note:
 

I had a reminder of this last weekend. I was starting up my GP Cherokee with an OS 55 on it. Had the stock plastic spinner that comes with the plane on it. Luckily I was standing behind the plane running it up when I heard POW. The backplate on the spinner let go and the spinner was thrown about 20 feet out in front the plane!!

Ken

RE: Beginners and experts, please note:
 

ahh, Norwegians... well what can you expect? :D

RE: Beginners and experts, please note:
 

Hi FrankHawks
I never have used a neck strap for that same reason. Could be very dangerous. Now that I'm getting old I have more difficulty holding the transmitter because some of my fingers have deformed or curled up. I may eventually be forced to use a neck strap. I have promised myself that I will keep the neck strap in my pants pocket, with no part sticking out. Once I have the plane started and have moved it off the Engine Starting Safety Stand and placed it on the ground, I will take the strap out of my pocket, place it around my neck, pick up the transmitter, and attach the strap clip to the transmitter. Upon landing I will reverse the procedure. That is my current plan. Any comments on this?

RE: Beginners and experts, please note:
 

I leave the strap attached to the transmitter and the transmitter away from the plane and prop

RE: Beginners and experts, please note:
 

That is a great procedure if you must use one of those, Villa.
Since I learned from an instructor that always used a neck strap, I also used mine all the time.
After a couple of close calls, I completely discontinued that practice.
Now, I am happy just holding the Tx with my hands.

RE: Beginners and experts, please note:
 

Reminds me to update my first aid kit under the passenger seat in my truck. The plane of rotation rules.

RE: Beginners and experts, please note:
 

I can't stop the backfire, but this is a good example of why I do a pre-flight before every flight. Check the prop for tightness, cracks, anything unusual, which most of the time will prevent it from coming off, except a backfire, or to high of RPMs. Pre-Flights are good anyways.

RE: Beginners and experts, please note:
 

In the airforce we called that the shell out line....  always stay clear of the shell out line

RE: Beginners and experts, please note:
 

WOW!!!!!! Just last week end as I was getting ready to take my 50CC Pitts Python swinging a 23X8 prop to power...a newer guy walked up and stood in line with the prop.....I asked him to please move and told him if the prop were to let go it would fly off in line with the prop.....then I felt kinda silly as I have never thrown a prop....After seeing that I am glad I did...
Thanx for the reminder....Oh and by the way it was 3 years ago Thanksgiving that I rearranged my fingers on the OS 1.60 and an APC prop......prop went long wise through the bone on my social and ring finger at the tip.....and 21 stitches total to those two fingers and my pinky......So please please be careful...
good flyin to all

RE: Beginners and experts, please note:
 

The problem with this reply is that it's the instructor's responsibility to see that this sort of thing does not happen in the first place. Dropping a student for making a mistake will wein the hobby down to two experts.. and I'm not one of them.

I was taught not to stand in front or to the side of a running engine. The only time I'm in front is during the start-up and run process, with any "close-in" spectators behind at all times.

I also teach the same thing to students. It's like muscle memory.. imbed those processes early on in training (like from day one, hour one, minute one, second one) and right or wrong, they stay there for a long long time. So, try to make those initial instructions worthy of the hobby and of the quality of the instruction.

I make darn sure that when I start the engine, no one is in front of the engine but me (it's awful difficult to start it from the rear). Then I move to behind the engine to do whatever I have to do to get ready to fly, all the time making sure that no one is around in front or directly on the side of that plane with the engine running.

That goes for electric, too, by the way. I'm sure they will throw a prop just as quickly as a glow or gas engine will if not treated correctly or if, asd Mike said, the prop meets it's expiration date. Just consider the RPM range of some of the electrics.. centrifugal force is an awsome power and always a potential prop thrower!!

CGr.

CGr.