RunRyder - If you can see the tower, don't fly. Duhh!

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Safety - RC Helis are not toys > If you can see the tower, don't fly. Duhh!

elton
Heliman
Location: Calgary AB, Canada

Out flying in my back field the other night. Lost complete control of my Fury. Never any problems prior to this. Just finished buzzing around and brought my baby in to land, going into a nice hover, all of a sudden, I've gone to full throttle straight up, I move my stick up, down, up down, and I've got nothing.
Machine continues straight up, until I can barely see it, then pirouettes about eight time, and then flips over, uh-oh, straight down headfirst into HE double hockey sticks. Not a piece big enought to identify that it was a heli. Looked at all my switches, nope, not thing out of place, battery still intact, check voltage, it sit's at 4.5 V. NiMh. My transmitter shows 10.1 V NiMh. Switch (heavy duty) on heli is good. I pull out all servos. Turns out, I had my transmitter on PPM instead of PCM. I was also using a JR 8700 servo with JR500T gyro....
THIS SERVO HATES PPM. Hmm, now that I see the result, I'm just reminding anyone who owns the JR8700. Don't fly it in PPM, it will glitch your reciever, severely. What really ticks me off, is that when I first bought it, the JR technical rep told my LHS owner, that yes, I could use it with an eclipse 7 (Hitec) radio in PPM. Don't do it, use the PCM reciever and set your Hitec up with PCM mode, NOT PPM. If you do, you'll regret it. I rebuilt the servo and hooked it up to my reciever again, with two other servos, one in throttle, the other in aileron. After three minutes, both other servos locked out in full extremes. This could of course be nothing more than a problem with my radio only. But, if you have the money to burn, such as destroying a new Fury Extreme, why not spend a little extra, and convert your Hitec Eclipse to PCM, or use a different servo. Just my thoughts, have gotten another Fury, and have switched to Hitec 925MG servo. Works great.

06-22-2004 Over year old.

thebignickey
Senior Heliman
Location: Marietta, GA

i have had no problems at all no glitching at all on my 6xh with the g5000t and 8700G but i have heard of the 8700 causing interferancebut now that i am geting a 8103 i will be using pcm the servo was in a zx so not worth much and didnt do much stuff with it but now i am geting a evo 50 so it is worth the money to get pcm but bottom line
IF YOU USE THE 8700 USE PCM YOU HAVE BEEN WORN

06-22-2004 Over year old.

jb_turner
Elite Veteran
Location: USA

The use of PPM with 8700 will NOT cause a lockout such as you had only loss of rudder control. You had another issue if you had no control of your helo.

06-23-2004 Over year old.

fitenfyr
rrProfessor
Location: Port Orchard, Washington

Well have you considered?

Quote
Looked at all my switches, nope, not thing out of place, battery still intact, check voltage, it sit's at 4.5 V. NiMh.

I don't know of any R/C gear that will work on less than 4.8V. I would surmise your pack failed or went flat prior to the loss of control and maybe your lockout was set incorrectly at full throttle?

Jason Stiffey
Fly Fast....Live Slow...

06-23-2004 Over year old.

HOMEPAGE

elton
Heliman
Location: Calgary AB, Canada

Hello all,
Well, I thought that perhaps I could have been overlooking something, so I set it up in a controlled environment. I plugged in the servo to the gyro, which then went into reciever. I then plugged in both my throttle and my roll servos. Plugged battery into switch, and this into my reciever. NOW, I'm not saying that this is exclusively the 8700's fault, yet it seems to be the only thing that causes the lockout. Of course, as I said earlier, it could very well be a number of small things that line up and cause this. Changing any one of them may break the chain of events. Anyhow, this was all done on a test stand, made of wood, no metal to metal. I played with all the combinations of stick movement I could. This time thirty three seconds, and both servos locked out to extrome throws. This was all done in PPM.
Next, I installed PCM reciever, and switched Eclipse into PCM. Now I was not able to get the servos to misbehave at all. All I'm saying guys, is this. I think the 8700 servo is a good fast tail servo, BUT, if you're going to go with HITEC gear, then make sure it's PCM. I may be wrong, but I'm hoping that if I can save someone a single crash worth a few hundred dollars, then I'll pass on my experience. It's just my two cents. I'm not trying to bash JR, as a matter of fact, as soon as I rebuilt my 8700, I switched my Hitec to PCM and installed the JR into my second Fury. I still think it's one of the best servos for tail rotors. Once again, there are so many variables in this, that it could have been anything, including the FM reciever that was in the heli, perhaps it was malfunctioning. I really can't say, since it has seemed to work fine until I switched servos, but you never know. Anyway, I'm not an electronics engineer, and I don't have a frequency scanner, so I'm making an educated guess. For all I know, an ion storm could have swept over me at that moment. Oh yes, voltage, I applied load, and that was 4.8 V at load. This is normal for a loaded battery pack, at no load, it will shoot up to 5.1
Once again, voltage could be a factor, I really can't say yes or know. If anyone has any ideas, then let me know.

06-23-2004 Over year old.

Fullagas
Key Veteran
Location: Michigan

.
bignickey,

Does your keyboard have any punctuation keys?

I believe you meant to say we've been 'warned' (alerted, prepared), as opposed to 'worn' (used).

.

I might not be very good, but I'm fun to watch.

06-24-2004 Over year old.

ozheli
Senior Heliman
Location: Sydney, Australia

What confuses me is what is the difference between PPM and PCM in the sense that this is the type of radio transmission between the Transmitter and your Receiver. It has nothing to do with the signal going out of the Rx to the servos/gyros. people seem to think that the PCM coding goes straight to the servos etc. This is not the case.

I'd be wary of Hitec radios and glitches. I currently own a Hitec Eclipse and am very worried about how many glitches I get. And if there are other Tx around at the same time (like at a flying field) it's even worse.

06-25-2004 Over year old.

hoverking
Veteran
Location: Tennessee

on the box for the 8700 it says pcm only

06-25-2004 Over year old.

Freya
Senior Heliman
Location: Seattle, Washington

You may get a glitch or "lockout" with PPM, But it wont go to a default failsafe. You must be on PCM to have a failsafe set up.

06-25-2004 Over year old.

corsair
Heliman
Location: Alberta Canada

Hi tec eclipes

A freind and I both have an eclipes radio and we have been having big problems with them. Some of the problems are when you give it full throtle it drops to idle and idle will goto full throtle, my radio would losse 5 deg pitch when the radio was turned off after we set it up, bare wires inside the tx, the board that holds the module in an the pins that go into the module were losse. this is just the start of the problems that we have been having with the eclipes.

Corsair

Rapor 30 v1 o.s 32 (resurected) 401gyro falcon 50 o.s 50 401 gyro Futaba 9C

06-25-2004 Over year old.

ozheli
Senior Heliman
Location: Sydney, Australia

corsair,

I know what you mean about the fullthrottle/idle thing. Go into your throttle curve menu, on your first point (piont no. 1), it will show zero. click the increase button one more time. It will show zero still but will get rid of the that problem. Give it a go.....it's so wierd..I hate it...

Same goes with the pitch curves.....

06-25-2004 Over year old.

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Safety - RC Helis are not toys > If you can see the tower, don't fly. Duhh!

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