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A Main Hobbies . Boca Bearings . Modefo's RC Helicopters

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Main Discussion > my version of Good Day/Bad day - 9C owners, help!
 
 
ZZ3Astro
Senior Heliman
Location: Panama City, Fl

A good day is when you come how with the heli in one piece.. and I did that.. but some of them are bent!!

Maiden flight on my Fury 60 today (actually the heli was purchased used and had about a gallon through it) Everything checked out good until the third flight.. that's when I put my freshly painted canopy on.

I went straight up, switching into idle-1 while climbing, to make sure the needle was good and at the top of my climb I was going to do a right stationary roll.. I noticed the roll input was a bit sluggish so I decided to go back to level and descend to see of there was a problem. I then realized the heli had a tendancy to roll right at center stick. At full left it would slow the roll slightly or sometimes stop the roll.. of course I didn't try a right input at this point. I switched through all flight modes to eliminate any mistakes in mixes, trims, etc. By this time the heli was over the parking lot and I did my best to bring it over the field before dumping it. Fortunately my flying has been good lately and I automatically brought the tail around and used the elevator to level it out.. I was able to auto down but flared hard and got the boom/flybar and some linkages... oh and stripped a gear on the elevator servo from the landing. Probably got more parts but at least the canopy never touched the ground.

Anyway, as I had all other controls, including collective and elevator, I find it difficult to believe one of the CCPM servos stalled or failed.. I had very good collective control and the elevator was responsive. The radio never went into hold and the battery meter showed a full charge (15 mins total on time since removed from charger). I know I've heard of another 9C doing this - going into a weird sort of lockout but not going into fail-safe. Anyone else seen or heard of this kind of problem?

I checked everything from linkages to canopy clearance.. everything works on the ground, nothing is or was interefering with the movement of the linkages. Going to be hard to trust flying this radio again until I find the problem.

Steve
03-30-2002 Over year old.
HOMEPAGE  
 
 
Virtual1
Senior Heliman
Location: Waterloo, Iowa - USA

Is there any chance there was a mix active in idle-up that you were not intending? I had to go through all the menus and wipe out the tail mixes everywhere on my 9chp. You'd think that with an expensive radio like that they'd assume you had a HH gyro, eh?
03-30-2002 Over year old.
HOMEPAGE  
 
 
Ken B
Elite Veteran
Location: Phoenix, AZ

Ahh, but they have. I have worked on 2 versions of the 9C. Mine(older) and a new version (freinds) The new version the revolution mixing is inhibited as opposed to mine which is enabled and needs to be turned off.

Steve,
I had my Fury bury it's self too. I had an unexplained forward pitch and full exceleration. This resulted in a beat up new fury.

I can not atribute the crash to the 9C. But I found the receiver to be short ranging after the crash. I have installed a new reciever and it seems to be working just fine. Besides the obvious I never had the PCM failsafe kick in. Still trying to figure that one out.

Now if I can just get the rest of my fury post crash problems fixed...

Ken B
03-31-2002 Over year old.
HOMEPAGE  
 
 
Itsindilas
Veteran
Location: Greece-Athens

Guys Happy Easter,

Convert to JR.....In the past I had a 7UHP and I had similar lock ups, it was due to the TX. Other guys had similar problems. Moreover and it's my opinion, futaba RXs are more sensitive in vibrations.

I refine that is MY OPINION.

Cya
03-31-2002 Over year old.
 
 
ZZ3Astro
Senior Heliman
Location: Panama City, Fl

I have been checking everything on the radio, wiring, servos etc and have not had a failure or glitch yet. I guess I'm going to have to keep trying until something gives.

Replaying the incident in my mind, I recall switching into Idle-1 and thinking man the aileron is suddenly sluggish... and then realizing I was in big trouble.

Wing is right.. the cyclic-throttle mix is still on in th-hold.. and these are the programmers who we trust NOT to make mistakes that result in aileron lock-out in the CCPM program..

steve
03-31-2002 Over year old.
HOMEPAGE  
 
 
ZZ3Astro
Senior Heliman
Location: Panama City, Fl

Hey Vokul,

Did your heli completely lock-out or did you have some channels woring?

Also I didn't mention this in my original post but I've had this 9C for about six months during which it was in my Raptor 30. I pulled the Rx, batt pack, 401/9253 and one 9252 servo from the raptor. The three CCPM 9252's on the Fury were previously unflown.

Another thing I forgot to mention (sorry, told the story in chat about 15 times before posting the msg) is that I had just played around with Expo on the aileron and elevator. I originally programmed in some expo of about -15 on those two channels. The cyclic was too slow so I disabled the expo. I the played around with the mixing on the head and got the cyclic rate I was looking for, so I went back into the expo menu. An interesting thing I found in the radio last night was that I managed to re-enable the conditional Expo for the aileron, but forgot to set the elevator expo to be conditional - instead leaving it assigned to the default switch (A I think). The conditional setting was for -15 expo in normal mode and 0 expo in all other flight modes.

This is the area I think caused the problem. I think the software in the 9C has a problem where under certain conditions, perhaps dealing with conditional expo, that it somehow can't find some numbers so your aileron stick inputs are basically ignored.

If I'm wrong, and I find anything not working on the heli, I will be the first to post that I'm wrong!

Steve
03-31-2002 Over year old.
HOMEPAGE  
 
 
bxc53
Senior Heliman
Location: Directly over the center of the Earth

9C Swash to throttle mixing

Wingtip,

Whoever gave you the 9C info is wrong. The mix will be disabled in hold when properly set up. Mine is anyway.
03-31-2002 Over year old.
 
 
JasonF
Senior Heliman
Location: Northern VA

I'm not sure I see the big deal on the cyclic to throttle mix. You just set it up so the mix is on when the throttle hold switch is in the off position and the mix is off when you click into throttle hold.

By the way, I may have found the problem with the 9c! A good friend of mine was able to snap a pic of the error before the tx shut down. Here is what he found:
[BREAK]
03-31-2002 Over year old.
 
 
Ken B
Elite Veteran
Location: Phoenix, AZ

HAHA, Your killing me!

ZZ3,

MIne was a total Lockout. I lost all control... Yet failsafe never kicked in.

Ken B
03-31-2002 Over year old.
HOMEPAGE  
 
 
JasonF
Senior Heliman
Location: Northern VA

Volkul what type of rx were you using for your intial Fury crash, and what did you do with it after it was replaced? Did the service center ever take a look at it?

Jason
03-31-2002 Over year old.
 
 
Ken B
Elite Veteran
Location: Phoenix, AZ

The reciever is a 148DP with a Revolution antenna and I have yet to send it in to the service center. But will be at the end of the month.

Ken B
03-31-2002 Over year old.
HOMEPAGE  
 
 
Heliboy3030
Heliman
Location: USA, MICHIGAN

Problem with my 9C

Today I was out at the flying field with my newly installed OS 91. I hovered for about a half a tank, landed, refueled, and went back to hovering. All of a sudden my Fury went from 3ft from the ground to about 100ft, by itself. It went all over the place. I had some control over it, but not total control. (Mind you I some what of a simular once before, I though it was due to me having an FM receiver, so I whiched it out and with a PCM 9 ch receiver.) I flew around for 15 to 20 seconds until it flew to close to some parked cars and I pulled the throttle down, and into the ground it went. None of us at the field could figure out what went wrong. Someone at the field narrowed it down to the transmitter. I asked him why did he think that. He said, " You didn't start having these problems until you switched transmitters".

PS: I was using an 8U with FM receviers and never had a problem like this ever.

Fury 60 Expert
9C and 8U
9402 on everything except throttle
3001 on Throttle
9Ch PCM receiver
4.8 volt battary
NEWLY installed OS 91
04-01-2002 Over year old.
 
 
scroller
Senior Heliman
Location: Paradise, CA

9C

Man all this talk about the 9C has me nervous. I have one coming today by UPS. Is there anybody out there that has a 9C that is not having problems?! Hope so...
04-01-2002 Over year old.
HOMEPAGE  
 
 
ZZ3Astro
Senior Heliman
Location: Panama City, Fl

I'm beginning to wonder if this problem is related to the recall on the early 9C's with regards to the front switch wiring. Someone made a post referencing this problem (which I knew about but was lead to believe my radio is the revised version).. The page at Futaba shows a sticker that is placed on the box and the tx case.. neither of which are on mine.

I hope that is the problem.. I like a definite cause and solution.. I have continued to stress test the three cyclic servos and still haven't been able to get any of them to fail.

Steve
04-01-2002 Over year old.
HOMEPAGE  
 
 
scroller
Senior Heliman
Location: Paradise, CA

sticker

Steve, what Futaba page shows this sticker. I could'nt find it on their site. Thanks.
04-01-2002 Over year old.
HOMEPAGE  
 
 
langen
Senior Heliman
Location: Stockholm, Sweden

I´ve flown w/ my 9C for the last ~5-6 mounths and I havent had any problems.. (yet)
04-01-2002 Over year old.
 
 
ZZ3Astro
Senior Heliman
Location: Panama City, Fl

The Japanese version of Futaba's site shows it.. And I actually did end up finding the stick on my 9C. It is located behind the RF module, not directly on it as I had thought. It's just a plain round silver sticker you'll see when you remove the rf module.

http://www.rc.futaba.co.jp/hobby/service/index.html
04-01-2002 Over year old.
HOMEPAGE  
 
 
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Main Discussion > my version of Good Day/Bad day - 9C owners, help!
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