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HelicopterMain Discussion › Haunted Heli
11-29-2005 01:16 AM  12 years agoPost 21
jkru

rrApprentice

Seattle, WA

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Al Qaeda!!!!!! There crashing heli's into the ground to bankrupt the RC fly'ers as part of the plan to bankrupt the US!!!

JKru

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11-29-2005 04:32 PM  12 years agoPost 22
Liron alm.

rrApprentice

Israel

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JKRU - good one lol!!
i live in israel so i can send you a bottle of holey water if you want
lol


liron

fly hard, land harder

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11-30-2005 08:22 AM  12 years agoPost 23
Andrew_S

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Gaston, South Carolina

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I vote for a bad crystal...

Drewskie

www.congareeflyersinc.com

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11-30-2005 09:36 AM  12 years agoPost 24
bagobitz

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saddleworth,lancs,UK

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I go with a bad cell. tried my Rappy one day,it shook so bad the training-gear was in danger of snapping.........anyway,back at the car,we're trying all sorts and suddenly all servo's go crazy for about 10 sec's. then everything's OK. but it still won't run right.giro erratic,servos slow/not responding. then I see the voltswatch has NO led's lit. .......charge battery, only 3.8V meanwhile the LHS has confirmed this month-old voltswatch is OK.
bit the bullet, stripped the shrink-sleeves off the JR battery-pack and measured the cells. ONE DEAD! cut it out and soldered in a replacement. all OK.
MORAL...... get a volts watch and TRUST it! (only a cheapie,but about $ 10 (£6 ) well spent.

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11-30-2005 11:51 AM  12 years agoPost 25
Thomas L Erb

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Alliance ohio

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Hi Bato sorry to hear about your problems but I take it that this happens during and towards the end of a single flight? I am also guessing that you are flying a FM rx. The aileron is the first servo to show any type of interference because it is the first on the signal line of your rx. My guess is that you have a bearing or somthing rubbing that takes about that amount of time to warm up to the point that it can cause the interference. Your best bet imho is to do a total stripdown and carefully check all your bearings and connections. these things are a pain to find sometimes. what hoverspeed do you have when this happens? hope this helps Tom

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11-30-2005 02:44 PM  12 years agoPost 26
Bato

rrApprentice

Monterrey, Mexico

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Thanks Tom... (and everybody else for that matter). I have been able to look in places that I didn't consider before.

This actually happens towards the 10 minute mark of the first flight after the bats are fully charged. From what I've been readding it could be either the bat, a cracked chrystal or metal interfierence. I know I'm going to have a bitch of a time weading it out.

The bearing theory doesn't sound bad though. Has this actually happen to you?? A wierd thing is that I'm flying a PCM Tx and Rx, thus this shoun't be heppening (theoreticaly).

When you talk about bearings I'm thinking towards the bearings in the shaft. Am I right? Considering that those are the only ones that supposedly have the most use. The ones inside the blade grips only move slightly (thus I'm thinking that they don't heat up so much as to cause metal to metal radio interfierence).

At the time of crash I'm flying between 1800 and 1850 RPMs.

I'll post findings and results. That's if I still have a heli left.

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11-30-2005 02:52 PM  12 years agoPost 27
Tday

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Needham, MA

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I still don't understand why you'd want to guess and do various teardowns, when for $39 you can diagnose cell versus glitch versus something else? Throw away the crystal and find it's still there. Replace the main bearing and find it's the one on the pinion or a bad cell with a dangerous peak low voltage. Like I said, Voltmagic will allow you to make a more productive diagnosis. At any rate, your heli will be almost brand new by the time you get done, and there's something to be said for that.

Tom

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11-30-2005 04:35 PM  12 years agoPost 28
Roger Hamilton

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Surrey, England

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If you are flying with a PCM rx, and you have interference leading to a lock out then theoretically the engine should cut to idle and the model sink to the ground from your hover position. If the engine is not cutting to idle and the model is reacting this way then I would suggest a power related problem. In my experience switches fail much more regularly than batteries so just replace this with a new heavy duty version.

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11-30-2005 07:06 PM  12 years agoPost 29
w.pasman

rrElite Veteran

Netherlands

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Futaba PCM also has a power-low safety built in: it will drop the trottle to idle.
I'm not sure, did you use Futaba PCM? If so, I suppose that rules out the broken-battery option.
I'm not sure what PCM does with broken crystals. It might go failsafe but it also might freeze if the computer in the PCM relies on a clock derived from the crystal..
Indeed PCM SHOULD rule out issues with bearing-related glitches. Unless of course you have set up the fail safe wrong, for instance such that you get right aileron instead of neutral in case of lockout.

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11-30-2005 07:13 PM  12 years agoPost 30
wolfdad

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Southern Maryland

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Obviously, you have something going on with the aircraft, that, after 15 minutes or so, either vibration or heat or a combination of both is getting to your aircraft. I would second the above motion on the crystal, since you mention that you have crashed a couple of times before. I would also be suspicious of any bearings you haven't changed out after your last crash. However, you can bet on one thing...it isn't going to get any better. Try changing out your crystal, then one thing at a time, until you correct the problem or re-kit the bird.

wolfdad sends....

"There are those who have...and, those who will" IRCHA #2117, AMA #70068, Turbine Waiver #105

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11-30-2005 08:17 PM  12 years agoPost 31
Tday

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Needham, MA

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Well, oddly enough, I've found that it's not possible to actually detect all lockouts while just flying. Some are so short that you don't even notice...or at least I don't. It's entirely possible to think you've got it all cleared up only to find that's not the case. One flight seems fine, the next not. In this situation, my counter tells me if I'm out of the woods or not since it counts all the lockouts whether I can notice them or not. Hence I know if I've found the bearing or not even if I didn't notice anything. The reverse can also be also true...no lockouts at all (and none measured/counted), for one or more flights, then a complete lockout. That's my experience with a cracked crystal, actually, versus a bearing problem which can be harder to diagnose.

Not fun, though, I'm sure you'd agree

Tom

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11-30-2005 08:30 PM  12 years agoPost 32
Nasscar][

rrVeteran

Delaware

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It's not a DNHP SR3 is it?

This heli spooked the hell out of me. Loved the way is flies, beautiful heli but it just wanted to be free and do what ever the #$#$@#$ it wanted to.

I hope you find your problem, if not sell her quick. I did.

Nas,

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11-30-2005 08:31 PM  12 years agoPost 33
woodymcnab

rrNovice

peterborough UK

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haunted heli

you could always ask Derek acora to try and exorsise the ghost.
LOL

proud member of the 601 crew!!!!!

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11-30-2005 08:43 PM  12 years agoPost 34
jkru

rrApprentice

Seattle, WA

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I saw some device once that would detect lockouts by a flashing light Ill see if I can find it. I know my Tubine computer detects tham and then I can see how many lockouts on the GSU. (Hopefully none )

JKru

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12-01-2005 04:29 AM  12 years agoPost 35
Thomas L Erb

rrKey Veteran

Alliance ohio

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Hi Bato if you are using a pcm are your failsaves all set for hold? The problem you described sounds to me to be a switch or battery conection problem. replace the switch with a hd one and replace your battery plug. I had a bad battery plug do the same thing when i got to about 1900 rpm on one of my machines. everytime i had an overspeed the machine would glitch. battery connection was wore and would make intermitent contact and cause the heli to jump just like when you first powerup the servos jump. At the time i didnt have a hh gyro so it didnt cause any other problems but today with a hh gyro this would also cause a reset of your gyro which i hear is a real pain to deal with. A pcm wont glitch. You stated at the start of this thread that you changed rx's i assume that you had a different crystal in each rx , if so the thought about crystal being bad is not an issue. I had a bearing go bad with my pcm . it was loud enough to hear squeeling the heli went into hold and flew by it self for about 5 seconds until the bearing stoped making noise. that was freeky! hope this helps Tom

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12-01-2005 04:48 AM  12 years agoPost 36
Fullagas

rrKey Veteran

Michigan

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.
I also agree it could be a bearing, (maybe auto) or metal-to metal glitch. Are you holding the Tx antenna up, not pointing at the heli? Lowest signal strength is with the antenna pointed directly at the bird.

Good luck!

.

Flying helis since gyros had springs.

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12-01-2005 05:42 AM  12 years agoPost 37
the collective

rrKey Veteran

Bayside, NY, U.S.A

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If the loss of control always happens around ten minutes into the first flight on a full charge, I'd suspect a bad battery.

Very easy to charge the battery fully and then discharge it on a load tester to measure its actual capacity.

Sorry to disagree with the bearing theory, but the fact that it's always going out at roughly the same amount of flight time after a charge strongly suggests a battery pack with much lower capacity than it should have.

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12-04-2005 12:41 AM  12 years agoPost 38
Bato

rrApprentice

Monterrey, Mexico

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Well campers..... the veredic is in

First some thoughts..

1.- The crystal was changed twice. Therefore it could not have been the crystal... Sorry for all the ones who were betting on this theory.

2.- The bat was cheked with a charger in order to measure its discharing rate. Bat was also OK

3.- The Rx was also changed.

4.- I had another crash exactly the same way on a different field, therefore radio interfierence was ruled out.

5.- The bearings were checked, therefore metal on metal interfeirence was also ruled out do to recent outcomings.

The last thing we tried was to change my module to another friend's Tx, and guess what!!!!

The problem is officially solved.

It seams that the program for the specific R50 model the Tx is busted somehow, (not the module but the Tx).

Today I actually had a flight without a glitch. Perfect maneuvering, nice hovering, good landing, smooth flips, awesome rolls, flawless inverted (I could keep going.... but I won't).

I'm HAPPPPPPPPPPYYYYYYYYY

Thanks to everybody who posted thoughts and possible problems since they were a perfect guide used to rule out problems. I sincerely hope that this post can help somebody else that finds himself in the same predicament.

Onece again.... THANKS EVERYBODY!!!!!!!!!!!

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12-05-2005 01:47 AM  12 years agoPost 39
PPLON

rrApprentice

Mexico City

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que bueno K!
pero que radio tienes?
what TX do you have?


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12-05-2005 03:28 PM  12 years agoPost 40
Bato

rrApprentice

Monterrey, Mexico

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9 CAP

Salu2

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