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Home✈️Aircraft🚁HelicopterHelicopter Main Discussion › 90SE GLITCHING !!!!! brand new bird need help????
07-21-2006 04:50 AM  14 years ago
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xcellfreak

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NYC NY

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90SE GLITCHING !!!!! brand new bird need help????
Hey guys i just bought a 90SE and the heli flies fine for about 1 1/2 tanks and then it goes wild for a spilt second and agin 2 seconds after that and so on . I have a futaba 9Z with PCM and F/S is set up . just cant figure out why. Has anyone had any problems with the corbon frames ????? please help guys just need some info . Thank You
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07-21-2006 04:58 AM  14 years ago
cjd24

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Hummelstown, PA USA

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Try running your antena wire differently from how you have it now. Make sure that you wrap your receiver in foam, maybe pull the crystal out and reinsert it for an affirmitive connection. You don't want your battery bouncing around either.
Curtis
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07-21-2006 05:16 AM  14 years ago
xcellfreak

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NYC NY

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I've already tried all that . the only thing that i havent done is change the reciver. i even went and changed transmitters. And same thing happened. I just wanted to know if this sort of thing happens to all the 90SE's or is it just my luck . but thanks curtis
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07-21-2006 05:29 AM  14 years ago
cjd24

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Hummelstown, PA USA

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Its just bad luck. I've been flying carbon choppers for years and haven't had a problem. Yeah, changing the receiver would be the obvious place to start, then you can work backwards. Good luck.
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07-21-2006 05:31 AM  14 years ago
xcellfreak

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NYC NY

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thanx , I guess thats what I'll do next.
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07-21-2006 05:37 AM  14 years ago
L29Driver

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Portland, OR USA

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That is interesting. I just had my Xcell with carbon fiber frame go nuts and drill itself into the ground. I bought it with a PPM rec. and each flight it would glitch about 3 or 4 times. I changed over to a PCM rec and it seemed to go away. Yesterday I had been doing loops and rolls.....I was in level flight for a moment and it seemed to just lock for about 2 sec with me moving the sticks to get something. It seemed to come alive and go nuts. Into the dirt it went! I am going to rebuild but the rec. is going into the garbage.


Before I stopped flying years ago, I used to have a series of crashes that would follow one bad one. It seemed to be from unseen electronic damage.

You are not alone
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07-21-2006 05:42 AM  14 years ago
xcellfreak

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NYC NY

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Thats whats makes it so bad,Im using a PCM reciver and yet it never locked out on me. which leads me to belive that it is the RECIVER ! well i guess after its back together i'll try out this new reciver .
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07-21-2006 05:59 AM  14 years ago
BARTGALAMBOS

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Huntsville, Alabama! U. S. A.

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CF acting like a Capacitor!
Hi,
In certain conditions the CF acts like a capacitor and stores energy statically. What happens next is this stored energy discharges through the antenna and you have a loss of control for a few seconds. I almost learned this the hard way.

I got together with a few Hams and we figured it out.

Bart
KI4KFJ-Technician
Precious Metal Investor!!!
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07-21-2006 12:01 PM  14 years ago
Yug

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UK. Herts

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The 4 screw heads holding the upper bearing block of the start shaft can rub up against the inside of the collective tray - this can cause rfi. Don't use the washers.Vegetable rights and Peace
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07-21-2006 02:14 PM  14 years ago
SPB

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Athens - Greece

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I had a friend with a Futaba 9Z with the same problem. Maybe 4 or 5 consequtive crashes with no obvious reason. Finally he changed the RX and everything worked fine.

Also using a strong box for your receiver is a must IMHO. It will definetely protect your RX even in very strong crashes.

Sotiris
myhelis.com Flying Team
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07-21-2006 05:39 PM  14 years ago
Tday

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Needham, MA

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My experience is the 90SE is quite prone to glitching/lockouts from rf interference generated by the model. I think there are some common sources---and the carbon frame isn't a real hot spot per se, unless the frame bolts aren't tight. So that's first. Second, the carbon tail servo push rod tends to rub on the tail box screws---very bad, so if you're using this, go to the wire. Third, many take out the feathering spindle pin when they substitute infinivation dampeners or carbon extreme dampeners for the stock reds/blues. Third, make sure the starter shaft doesn't have play in it as the top can rub. Over time, the pinion gear on the clutch can wear so that it spins in it's race---very bad as well and very hard to find. Those are the big ones---other than bearings that are notchy which can happen to any model.

Tom
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07-22-2006 03:58 AM  14 years ago
L29Driver

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Portland, OR USA

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Ok,

That makes sense. Now what is the solution?
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07-22-2006 05:11 AM  14 years ago
BENTDABOOM

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west seattle

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just reading thru this thread and you were asking what the solution was? it would seem you need to trace it down by trial/error, not too much fun but looks like your only option>>>>> goodluck CAUTION!!! politicians may be hazerdous to your well being
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07-22-2006 05:27 AM  14 years ago
tauscnc

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Joliet IL

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Same stuff here. 90SE locked out in PCM for about 1.5 sec. I started a thread about range check on my 9303 and locking out with a PCM RX.

I never really found the problem but here is what I did find. Using a FM rx I can get (most of the time) 2x range on the ground. Using a PCM (JR 770S and the new 2100) I get between 40 feet to 200 feet range, it just depends. I think I could range check everyday and get a different number.

I found routing the antenna (PCM) past the wires down to the skid and then out of the canopy to be a problem. The antenna just does not like being near the "engine head" area. I now let it dangle inside the canopy and have it exit out by the skid into the antenna tube.

I found wrapping the antenna around the carbon chassie and boom supports, etc not to matter on my range.

I did find that my regulator might of been the problem so I moved it and found the range to be much better.

So I tried to move all the wires around and away from each other as best as I could and moved my regulator to the top of the servo tray, my gov is mounted on the front and the RX is sitting on the servo tray...my battery is ont he bottom but not under my RX.

Range check and it came out to about 140 feet and I called it a day and flew. So far so good.

I also have a T-rex SE and put the 770s PCM into it and it range checked about 60 feet! With the antenna hanging down away from the heli I can get over 200 feet. Maybe it is something about the carbon. If so I have no clue how people fly full carbon helis or any carbon sailplane.

taus
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07-22-2006 08:55 AM  14 years ago
xcellfreak

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NYC NY

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THANK YOU ALL VERY MUCH FOR THE INFO. I still didnt get all the parts to put it back together yet. but a friend of a friend is a TT rep. and he flies nothing but these birds so lets hope it will all go well. i already bought a new RX and crystal set.So heres where the trail and error begins. once again thank you all
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07-29-2006 06:24 AM  14 years ago
Ringo Ranger

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Honolulu, Hawaii USA

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I'm enjoying my 90 se with no problem at all.

14 Mz
g3 rx
futaba 401
cool power20

try change channel maybe it works.


aloha all!

ringo

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07-29-2006 02:32 PM  14 years ago
AMainMaker

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Nappanee,IN

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I use a revolution base loaded antennae mounted under the battery trey pointing toward the nose of the fiberglass canopy. Haven't had any issues ever. I have had this setup for about 2 years now. I use the same on my 50SE with no problems. I use a JR 955 PCM Rx in the 90 SE and a JR 649 PCM rx in the 50.
Jason
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09-09-2006 05:13 AM  14 years ago
tauscnc

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Joliet IL

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I just got my radio back, 9303 synthesized module and syn RX (the newest one) and they said nothing is wrong with it. So I tired it and 1.5 flights into it the heli went into fail safe for a second or so and I luckly landed in one piece.

Still unable to figure it out. Bearings in engine, starter shaft, mainshaft all seem good. All screws tight, etc.

Next to try base loaded antenna and or different rx.
taus
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