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HelicopterMain Discussion › I did it again
05-03-2005 06:50 PM  12 years agoPost 1
JamesV

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Savannah

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Well I did it again. Went flying Sunday with my trusty Evo 50. Flew one really good flight, came back and flew a second one a little harder and lower. I climbed up and thought I would do a few piro flips and a chaos or 2. No problem. Next I get some more altitude and try a 4 point tic-toc. I tic-toc nose up first then rotate the nose to the right. Next thing I here a hit, like a boom strike. I immediatley go into hold. I look at the machine and both blades are now folded back and not spinning. It falls quick.LOL Go over thinking its a total loss, like my last boom strike was. The main shaft is bent bad,spindle, broken frames, servo tray, broken vertical fin and canopy, boom is straight but here is the kicker a small dent behind the horizontal fin. My thunder Tiger 600mm blades are still in good shape with no nicks cracks or signs of contact with the boom. I did strip out the fore and aft cyclic servo gears, but I dont know if that was do to impact or not. This canopy took all the impact going nose in, and it hit so hard it broke off the throttle servo horn and servo splines.

My question is what could have happened? I have carbon extreme dampers, so I didnt think I would be able to hit the boom? Could I have bent a spindle in flight, causing the blades to go out of track? or cause a boom strike? Even f I had a strike, I would think it would hurt the blades.

Is there a point when you can fly a 50 size machine too hard? Just wondering what could have happened......

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05-03-2005 08:51 PM  12 years agoPost 2
zoom boy

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N.E. Lincolnshire UK

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I know how you feel, last sunday I had my Evo go into failsafe mode, they really should rename that "feature" I was hoping it would come out of failsafe in time but it didnt, oh well.

New blades, gears, boom, spindle, servo frame and mast.

It should be up in the air by this weekend, naturally I have swapped out the rx, I would rather have to fight interference if I get it rather than get locked out and become a spectator.

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05-04-2005 01:47 AM  12 years agoPost 3
wurthless

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Redding Ca.

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Think for just a minute about what might have happened with-out fail-safe,,,,I'd rather see my heli go to the ground than take off to never never land,,,,

QUICK! ,,,can someone turn the gravity off for just a second,,,,

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05-04-2005 11:44 PM  12 years agoPost 4
zoom boy

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N.E. Lincolnshire UK

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At least without the failsafe I still have some say in where it crashes, in failsafe mode it is possible it could just fly off.

In failsafe mode the model suddenly becomes a free flight model, not a good thing IMO, if I can still control it even if that means I'm fighting it then that is better as far as I care.

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05-06-2005 06:11 AM  12 years agoPost 5
wurthless

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Redding Ca.

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If you set it up with the throttle to go to idle in FS how can it fly away????

QUICK! ,,,can someone turn the gravity off for just a second,,,,

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05-06-2005 03:10 PM  12 years agoPost 6
zoom boy

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N.E. Lincolnshire UK

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But you have no control over where it goes in.

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05-06-2005 07:49 PM  12 years agoPost 7
Leif

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USA

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Raptorfewl - back to your original post and questions:

It's very possible that your boom strike was the result of blade-lag, which itself may have been induced by blade stall (too much collective + too much cyclics at the same time). Even CX dampeners can't help you if the blade folds back in the grip.

Hitting Hold immediately, while correct from a textbook standpoint probably wasn't the right thing to do in this case. Recovering from blade-stall means backing OFF on the collective to build up head speed. Had you done this, the lagged blade would have spun back out and you would have regained control of the model. Also, having the blades at zero pitch would help keep even a lagged blade from hitting anything.

Just a theory, but I think it can explain what happended based on your observations.

Leif

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05-06-2005 07:51 PM  12 years agoPost 8
Leif

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USA

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ZoomB - You gotta ask WHY you're in failsafe in the first place. At least the Futaba PCM receivers come out of failsafe very quickly when the radio signal is re-aquired. The only failsafe lockouts I've had have been less than 1 second in duration. If you're locked in failsafe, then your RX isn't receiving your signal.

The assumption that with FM you'll have control of the heli is open to question. You're assuming that the "hit" is a very temporary neutral blockage of your TX signal. What's more common is that the "hit" is interpreted as a valid servo command, often leading to full-deflection inputs of the worst kind.

That's why failsafe was invented: to produce a predictable response to a loss of radio control.

Most pilots will program it for all servos to lock except the throttle, which goes to idle. The logic for this is that an out-of-control model at idle is MUCH less dangerous than one that is going in under full power. Also, by removing the power source you're ensuring that the model DOES descend within the range of the pilot's location and does not fly off for 10 minutes before finally crashing in a potentially populated area.

This is one of the reasons that I'm not too keen on the whole co-pilot concept. Having the model "keep flying" under power once the pilot has lost radio control is not a good solution if the control does not return within the next 30-60 seconds. If such a "temporary" version of the co-pilot could be implemented I would be all for it.

Leif

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05-06-2005 08:54 PM  12 years agoPost 9
zoom boy

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N.E. Lincolnshire UK

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True, the thing is though that the area we fly at has huge factories on two sides, lots of metal reflecting the signal back, the day before one of the other people there got a hit on his glider.

If was in failsafe for about 4-5 seconds, and after the crash the control returned, the tx has been fine with other models, later on that day I was flying my zoom (PPM) and I got the occasional glitch on it, but the sports hall I fly that in is glitch central anyway, I would never want to fly a PCM model in there.

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05-06-2005 09:28 PM  12 years agoPost 10
allns47

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Richmond IN.

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zoomboy
You fly a helicopter in a area that gives you glitches frequently?..I would be a little afraid to fly in such a place....

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05-06-2005 09:56 PM  12 years agoPost 11
zoom boy

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N.E. Lincolnshire UK

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Its the only place available thats 100% fine with model helicopters, if I had a choice I wouldnt fly there, the problem is the local clubs are mostly anti-heli

Its not too bad down there, I've had the odd glitch here or there, but that was the first time I had one last that long, and all my other models used PPM recievers, so they dont lock out.

That was the only time it ever went into failsafe since I have been flying there, which is about eight months, but with my glider and my other heli, I have seen a glitch once in a while, and I have seen others get them.

But it beats having to deal with the plankers at the other clubs

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05-07-2005 01:21 AM  12 years agoPost 12
NewHeli

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Pittsburgh, Pennsylvania, USA

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FS good or bad? I have a Futaba 9ch PCM rx in my XCell, but I haven't set it up for FS. Should I or shouldn't I? How do I do this with a Futaba 9C?

What are the pros/cons of FS?

NewHeli

Nathaniel Rice
Team YS Engines

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05-07-2005 02:43 AM  12 years agoPost 13
Sealerman

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Long Island, New York.

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the day before one of the other people there got a hit on his glider.
Dam, how can you tell when a glider gets hit.

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05-07-2005 08:31 AM  12 years agoPost 14
zoom boy

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N.E. Lincolnshire UK

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Aerobatic glider, and it started going nuts

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05-07-2005 09:36 PM  12 years agoPost 15
heligoole

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yorkshire,uk

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sounds like you pushed it to an extreme,did you have any binding at all prior to this?did you check in all pitch/cyclic eventualities?though probably not the cause,worth checking..

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05-07-2005 10:45 PM  12 years agoPost 16
Sealerman

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Long Island, New York.

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Its not too bad down there, I've had the odd glitch here or there
Not to bad until you get a pitch or throttle glitch in the pit area or when your putting the heli down getting ready for a flight.

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05-07-2005 11:36 PM  12 years agoPost 17
NewHeli

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Pittsburgh, Pennsylvania, USA

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So FS good/bad?

Thanks, I know I'm sort of hijacking this.

NewHeli

Nathaniel Rice
Team YS Engines

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05-08-2005 01:12 AM  12 years agoPost 18
wurthless

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Redding Ca.

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I vote ,,,good,,,set up to hold last inputs but with the throttle to idle,,,,,,

QUICK! ,,,can someone turn the gravity off for just a second,,,,

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05-09-2005 09:47 PM  12 years agoPost 19
JamesV

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Savannah

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Heli Goole- I was running a cyclic ring on transmitter and have also checked for binding.

This thread has gone from trying ot figure out why I crashed to someone else's Failsafe problems. If you wank to talk aobut failsafes, take it in your own thread please.

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05-09-2005 09:58 PM  12 years agoPost 20
heligoole

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yorkshire,uk

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i suppose with a cyclic ring and checking for binding this is definitely not the problem..i thought it would be worth a mention though..gud luk in future flights

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HelicopterMain Discussion › I did it again
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