RunRyder - gasser interference???

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Gasser Model RC Helicopters > gasser interference???

peterp105
Senior Heliman
Location: NORTH EAST TENNESSEE

ok i have tried all of your suggestions, my x-cell gasser gets hit once a flight. i do not know what to do with it. i use pcm and it seems that the throttle goes to idle for just a split second then comes right back to where it was. it flies fine but is this dangerous?

10-22-2003 Over year old.

ELOSSAM
Veteran
Location: Es

First of all check you have not a broken receiver aerial, It tends to break due to continuous oscilation if its not properly fitted and that happened to me last week.
Place your aerial as far as you can from your magneto. (I placed the receiver backwards the heli instead of in its nose to keep it away from RF noise).
Never run the receiver aerial parallel to a metalic tube. Mine goes down to the skid and then back to the vertical fin end)
Chech all the heli screws are tight screwed and no carbon piece can move to another, it makes lot of RF noise
Use "R" plug type
Use Special plug cap with resistor and better if its a metalic one.
Shield the plug wire with a metallic and grounded cover.
install a capacitor.
Use ferrite rings on all your servo wires close to the receiver.

Doing all that I was able to use not only my PCM but a single conversion PPM receiver with no glitches.
Hope it helps
Elossam

10-22-2003 Over year old.

HOMEPAGE

ericd
Senior Heliman
Location: New Eagle, PA

Are you 100% sure you're getting a hit? Is it out long enough to notice a lockout?

Just wondering if it's an engine issue that is happening so quick that it seems radio related. (Like a quick 'burp' or something.)

Just a thought...

Eric...

10-23-2003 Over year old.

Malorie
Elite Veteran
Location: Paw squared, MI

I agree with Eric. It could be that your engine just isn't warmed up and is doing a quick cough. Mine tend to do the same thing if I don't give it a minute to warm up before I start slaming it around.

Malorie

Life's a journey, NOT a destination.

10-23-2003 Over year old.

peterp105
Senior Heliman
Location: NORTH EAST TENNESSEE

i dont think its the engine, i always do a 2 min runup before flying, and the engine never misses a beat. should i wrap all my wires in something?

10-23-2003 Over year old.

rbort
Elite Veteran
Location: Franklin, MA - U.S.A.

DO NOT turn failsafe off!

How can I stress this...NEVER turn the failsafe off to see if the engine is hickuping or if the heli is going to failsafe. When the heli failsafes, the engine goes to idle, and it interrupts the vibrations that were causing the failsafe, and hence, you recover and that is exactly what you want to happen.

I've had this problem in the past and one day I decided to turn off the failsafe due to a suggestion from a fellow flyer on the field "to make sure that it is failsafing and its not the engine hickuping" and it locked out in a hover, engine stayed where it was, vibration induced noise continued, and it drifting into the ground - whack! What a pain...!

Instead, like I may have said before, leave failsafe to idle, make sure aileron, elevator and rudder are set to return to center stick, and collective is on hold. This way it stops whatever it was doing, you get a couple of hang in there seconds, and the failsafe recovers before you crash every time. - like you are seeing today.

Now to solve this, if you tried all the suggestions, then do this. Change the channel of the receiver and TX to a different frequency. For example if you had channel 52 go to channel 15 (the other end of the range). I'm assuming you may have already tried a new crystal. Whatever noise may be may not interfere with a different channel. This may work for you. Otherwise you can try to locate the noise interference. In that case I would recommend that you disassemble the tail rotor transmission in the front of the heli. You may find one of the 3 bearings has worn a groove on the shaft. If that is the case replace the shaft and the bearing if necessary and use green locktite on the bearings. That is a noise producer and can cause your problem. Two suggestions here which I am pretty sure you didnt try yet.

Good luck and let us know how you make out. If you like, call me and I will try to talk you through the problem. Maybe something you say might trigger in my head why you are having these issue. I can be reached during the day at 781-446-1014.

Thanks and good luck!

-=>Raja.

1005 Xcell Gas, BHH G26 3D Plus, Jewel Generator
Spectra-g, BHH G26 3D Plus, Jewel Generator

10-23-2003 Over year old.

ELOSSAM
Veteran
Location: Es

If you want to check the receiver integrity and transmitter range without the fail safe do it AFTER REMOVING the main blades so you can go to operational RPM and without any danger of crashing the heli or hitting your friends. If there is any problem inside the receiver like any component vibrating and doing erratic contacts you will be able to shut down the engine using the kill switch if you still have it. Point the trasnmiter aerial towards the heli (the worst transmitting range) and as soon as you noticed any non regular engine running put the aerial up to recover the full range. when I discovered my broken receiver aerial I was not able to hover the heli from 10 meters without the failsafe comming in and iddling the engine even with the trasmit. aerial full extended. My receiver aerial was broken close to the receiver but it can be broken in the middle giving you more range but not all.
Another cheaper thing you can do is to ground the tail boom to the heli frames if they are fitted with a plastic coupler. (only if the tail boom is alu made or carboon too like the heli frames; Sorry I dont know how is your heli)
Elossam

10-23-2003 Over year old.

HOMEPAGE

flyboy
Elite Veteran
Location: California

Botch spark cap suppressor? sp

10-23-2003 Over year old.

cfranks
Veteran
Location: Adelaide South Australia

This happened to me on two gassers, a Benzin Trainer and a Bergen.
Different flying fields so it had to be self generated. Seemed to happen when the heli was turned about 45 deg coming towards me and at either end of the field. I got rid of the problem by connecting a grounding wire to the tail boom and the boom supports then back to the engine. From a problem on every flight to none after 20+ flights is good enough for me.

Charles

10-24-2003 Over year old.

ImRich
Veteran
Location: Derry, NH USA

This probably is radio interference of some type, but I thought I'd mention just one hint that may help.

A person at our field was complaining about radio problems similar to this a while ago. He couldn't solve the problem and tried just about everything.

The last thing he did was get a new battery pack. That solved the problem! Remember that most PCM radios have a battery fail safe also. They are usually programmed to reduce the throttle to idle (or some pre-set point) if the battery voltage falls below a certain point.

At least on Futaba transmitters you reset the throttle so you can land by changing the throttle stick below the pre-set point and then back up again.

Have you checked your battery/power system under load and for vibrations? This could be anything from a vibration sensitive switch to loose wire or connector to a marginal battery.

---
Rich

10-27-2003 Over year old.

HOMEPAGE

peterp105
Senior Heliman
Location: NORTH EAST TENNESSEE

yeah the batt is brand new, unless the rx has a problem i dont know what it could be.

10-27-2003 Over year old.

rbort
Elite Veteran
Location: Franklin, MA - U.S.A.

That's too bad

Sounds like you are frustrated and no success in finding the issue. Why don't you tell us what you have done already in1 post bulleted items and post some pictures of your heli so we can see the setup. That way we can come up with more suggestions for you.

Ok?

-=>Raja.

1005 Xcell Gas, BHH G26 3D Plus, Jewel Generator
Spectra-g, BHH G26 3D Plus, Jewel Generator

10-27-2003 Over year old.

ELOSSAM
Veteran
Location: Es

Check your receiver cristal to see if it can vibrate. Secure it bending its legs a little.
Elossam

10-27-2003 Over year old.

HOMEPAGE

ImRich
Veteran
Location: Derry, NH USA

A good way to test your servo's, battery, receiver, and switch is to get yourself a electric engraving pencil. These are the inexpensive units you can get at most hardware stores or even department stores (walmart, etc).

What you do is place some fuel tubing or a rubber pencil eraser on the end of the point of the electric engraver. Then set the engraver so that it will generate the most vibration (some of them are adjustable). Place the rubber end on your receiver, servo, etc while your transmitter and receiver is on. If you can locate a part which causes your servo's to move around when you hit it with the vibration (or it causes your RX to go into lock out on a PCM receiver) then you have found a vibration sensitive part.

Don't think just because a battery, RX or any other part is brand new that you can exclude it. Every part is suspect until you find the problem.

If this doesn't help, start trying to vibrate different parts of your heli and see if that causes problems.

One thing to be aware of is 'near field' radiation of your transmitter, this can make you think you found a problem when you actually have the transmitter too close to the equipment under test. If you can place your transmitter as far away as you can and have the antenna pulled up only one section while you do these tests.

Don't give up! The gasser is a joy to fly and you will find the glitches.

Don't forget to check your spark plug for the proper type, proper gap, and good solid connections. Also check to be sure that it's not full of oil, carbon or other combustion products from being run too rich.

---
Rich

10-27-2003 Over year old.

HOMEPAGE

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Gasser Model RC Helicopters > gasser interference???

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