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HelicopterSafety - RC Helis are not toys › Slowing down helicopter blades
01-24-2010 07:42 PM  8 years agoPost 1
G Steyn

rrApprentice

Heidelberg, Transvaal, Suid Afrika

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I was wondering if I should post something, or not, and decided to do so. (so other pilots won't be as stupid).

Two days ago, I was busy practicing with my wife(caller), with my JR Vibe 90 SG. I didn't have a lot of time due to a hectic working day, and also a TX battery pack that was not fully charged, so bottom line: I was rushing things.

After approximately my third flight of the afternoon, I autoed the heli, and killed the engine, when the heli was safe on mother earth. Wanting to take the engine temperature as soon as possible, and as done so many times before, I placed my palm on the head of the heli to slow the blades down. (Now as all 90 size heli pilots would know, it is quite a stretch).

My hand slipped off centre, landing my forearm in the spinning blades. The one blade struck my left calf, to a DEAD stop, and the second blade my right knee, also to a DEAD stop. Breaking both blades. Worst of all, neither of the blades have even a scratch on them.

Needless to say, I was not able to stand for approximately 30 minutes, went and layed in the shade of the pick-up for approx 10 minutes to "absorb" the shock. Every time I try to stand up, my legs just gave way. Today was my first day not making use of serious pain pills, but still walking around is quite a challenge!

Damage on the heli:
One set of Rotortech 720 F3C SG blades,
Main shaft, slightly bent
Spindle shaft slightly bent
Two links badly bent
Main blade holder pitch arms both twisted.
One SERIOUSLY humble ego........

PS: I am really glad I didn't need any casts, but It was pretty dambn close!

Concentrate on your weaknesses and your strengths will reward you!

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01-24-2010 09:01 PM  8 years agoPost 2
QuantumPSI

rrElite Veteran

Atlanta, GA

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Sheesh man, how fast were the blades still going when you tried to slow them down? I always wait at least a LITTLE bit before trying to slow them just in case something like that happens it doesn't do any damage (to me or the helicopter).

...now where was I, dh/dt = BS-dx/dt
I will fly you forever... till earth do us part

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01-24-2010 09:06 PM  8 years agoPost 3
aussie_g

rrVeteran

Travelers Rest, South Carolina, USA

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I doubt that there is anyone in the hobby that hasnt done something stupid.

I try to be very safe, but there has been once or twice that I have tried to start a heli without turning the RX on.

I like many others have had a hot start.

Sorry to hear about your damage, and pain. but luckily its not bad enough for any long term injuries, but its bad enough that it puts a little fear back in your mind & will make you a little safer next time.

Gareth

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01-24-2010 09:57 PM  8 years agoPost 4
ShuRugal

rrKey Veteran

Killeen, TX

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When i need to slow the blades down quickly, i set them to full negative pitch while i walk over. Usually by the time i get to the heli, the blades are only going around at about 60-120 rpm, and stopping them is no worry.

granted, i fly a .30, but i expect the same thing will work, ableit more slowly, on a .90

AMA 700159

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01-25-2010 02:39 AM  8 years agoPost 5
max232

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Pensacola

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Sorry to hear this i have done it with my 90, although not breaking the blades,but some smarting pain in the legs.also a slight sting in the ego dept

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01-25-2010 03:07 AM  8 years agoPost 6
2LTime

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Walworth,NY

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I hit rudder upon landing when I know it's planted and won't actually turn. Once this has slowed the blaeds down sufficiently I leave full negative and put the right stick in the upper right corner. By the time I get to the heli the blades are barely moving.

Jeff

If you can't learn to do it well, learn to enjoy doing it badly.

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01-25-2010 04:53 AM  8 years agoPost 7
G Steyn

rrApprentice

Heidelberg, Transvaal, Suid Afrika

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Thanks for the condolences, it DOES help mend the ego a little. LoL

Hovering Rpm is 1600rpm, guess I started slowing down at approx 1000rpm, and -6 deg pitch. Stoopid hey!

In my mother tongue we have a word that is: HARDEGAT. Translated, that would mean HARD-HEADED, the root of this incident. You know: I WIIL stop those blades FAST.

But like the wise old guys always say:

YOU LEARN FROM YOUR MISTAKES.

Concentrate on your weaknesses and your strengths will reward you!

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01-26-2010 01:28 AM  8 years agoPost 8
Raptor Pilot

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Northern Ireland U.K

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i set them to full negative pitch while i walk over
Me too, and by the time i get to the heli the blades are well slowed. At least this guy G Steyn admitted he made a mistake and is letting the rest of us know what happened to him so that we can all learn and hopefully not make the same mistake.
As i so often say,'the man that never made a mistake, never made anything'.
G Steyn, hope your recovering well and will be back out there flying again soon.

If it doesnt move and its meant too... use WD 40. If it moves and its not meant too...use duct tape!

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01-30-2010 03:34 PM  8 years agoPost 9
fflier9

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Wauwatosa, WI USA

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you can hit the rudder and also move the cyclic into the corner, this slows the blades down real quick.

but OUCH man! glad you're ok. That must have seriously hurt.

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02-14-2010 10:47 PM  8 years agoPost 10
MEL760

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Canton, Michigan-U.S.A.

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throttle hold and full positive pitch...

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02-15-2010 12:41 AM  8 years agoPost 11
Vibe Ration

rrVeteran

Mont-Laurier, Qc, Canada

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Or full negative pitch. All my pitch curves are at -12 0 12. Stop faster and always on a configuration for an auto.

Vibe 50, CopterX 450, Gaui 200EX, DX7se

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02-15-2010 01:59 AM  8 years agoPost 12
MEL760

rrApprentice

Canton, Michigan-U.S.A.

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It's always alot of fun to practice low auto-rotations and that will bring the blades to a quick stop and prepare you for the real auto's, I had one towards the end of last summer with my scale 30 Eurocopter Ecureuil, was at about 50+ feet and ran out'v fuel , luckily I landed with no damage other than my underoos...

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02-15-2010 02:24 AM  8 years agoPost 13
NQNA

rrElite Veteran

USA

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Watch the full pitch until the head has slowed enough.. would hate to see it get airborne again..

This accident is exactly why I don't let my passengers out of the helicopter (full size) until the blades are stopped.. anything can and will happen..

Glad you're feeling better..

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02-15-2010 02:28 AM  8 years agoPost 14
MEL760

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Canton, Michigan-U.S.A.

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how much negative pitch does the real heli have???

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02-15-2010 03:37 AM  8 years agoPost 15
NQNA

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USA

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I really don't know the pitch window for a full size. I imagine the mechanics might have an idea.. but the negative pitch is adjusted to maintain the correct rpm during an auto and with some helicopters it is adjusted with the season changes.

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02-15-2010 11:57 AM  8 years agoPost 16
MEL760

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Canton, Michigan-U.S.A.

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was just wondering if there is enough negative pitch to suck an object up if landed and still high rpms (like a human)

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02-15-2010 12:45 PM  8 years agoPost 17
Rototerrier

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Fayetteville, GA - USA

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I just want to know how you autoed and the blades were still going that fast. When I auto, the blades tend to lost most of their speed by the time I am fully down. You must have hit fast and slighty hard to have maintained that high of a headspeed. I have the blades hit my legs plenty of times after an auto, but I don't sweat it cause they just aren't moving that fast. Sorry for your pain...and like everyone else has stated, shave off the speed with a little pos/neg pitch cause this must have been very frustrating.

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02-15-2010 01:53 PM  8 years agoPost 18
NQNA

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USA

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No there is not enough negative pitch to suck-up a human.. LOL..

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02-15-2010 02:02 PM  8 years agoPost 19
MEL760

rrApprentice

Canton, Michigan-U.S.A.

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DAM, LOL

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02-15-2010 05:05 PM  8 years agoPost 20
NQNA

rrElite Veteran

USA

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I would be quite a sight though..

Have you ever seen the old Bell Helicopter tests videos? One of the test pilots got the helicopter into what I believe was ground resonance (A series of shocks to the landing gear can pass through to the rotor disk and cause an imbalance in the rotor system. Under extreme conditions, the imbalance causes violent oscillations that quickly build and result in catastrophic damage of the entire airframe. In some cases, complete destruction occurs, e.g. body panels, fuel tanks, and engines are all ripped from their mountings.) and was shot up into the main blades (no seat belt)... He actually survived!

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HelicopterSafety - RC Helis are not toys › Slowing down helicopter blades
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