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HomeAircraftHelicopterCentury Radikal G20-30 N640 Hawk Predator › Pmax glitching problems
12-06-2004 03:16 PM  13 years agoPost 1
jameswill4

rrVeteran

Pineville KY

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Guys I have developed a glitch in my bird that I need a little help with. I think I have it narrowed down to a few diffrnt thing What do you guys think?
1. Glitch only happens in the throttle servo. Servo bad?
2. Only happens on 2nd flight after full charge on cycler. but battery meter on heli shows arund 3/4 of charge on battery. Battery is a Jr 3000mah 4 c cell pack. It has had alot of flights and about a year old.

All nuts and bolts are tight nothing is loosening up and never had a glitch until now so I do not think that it is in the bird or the reciever as I would think that the glitching would be all of the servos not just the throttle. Reciever has never been in a crash. What do you guys think. have never had a glitch like this usually a radio hit where everthing jumps for a split second. THis time the throttle servo kind of pulsates. Servo is a Hitech 525 hi speed brand new about 5 gallons and never in a crash. What do you guys think?

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12-06-2004 03:52 PM  13 years agoPost 2
AGRAV8

rrProfessor

Mosquito Coast......Houston Texas

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ditch it
swap the throttle servo.

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12-06-2004 07:43 PM  13 years agoPost 3
oldfart

rrProfessor

Vancouver, Canada

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If you are using a 9ZH (if memory serves me correctly, my 10SXII was the same) then they automatically default to "low throttle" whenever the voltage drops to an unsafe low voltage. One gets everthing back after cycling the throttle stick back to the bottom. This can cause many to believe they are getting glitched or have a bad servo.

The fact that you have one good flight (and I am assuming you are using all digitals) I would suspect this could be what is happening.

1 - I would first check the switch as it may be intermitant (which would cause a similar symptom).

2 - I would cycle the battery pack and test in a vibration rich environment - e.g. tie it to the base of a dremel saw (this will provide the vibration), turn on the saw and test the battery.

3 - You may have one or more servos binding that is requiring high amperage peaks (this will temporarily lower the voltage) during/at particular servo settings.

4 - You may have a bad engine bearing or clutch bell support bearing. The glitching caused by something like this would cause the radio to intermitantly go into and out of failsafe. If you have your failsafe set to hold the last setting on all servos but to also move the throttle to idle, a bad bearing will generate enough interference to cause momentary lockouts that will cause the same symptom. Remove the backplate from the engine and check the rear bearing for any sign of rust or roughness)..... ditto for checking the vlutch bell support bearings.

5 - If you have not properly aligned the clutch to the bell, this can cause the start shaft to spin at the rpm of the engine and cause premature wear of the start shaft support bearings - this will also cause RF that can be similar to #4.

I hope this helps

Phil Noel
Leisure-Tech Products

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12-06-2004 07:58 PM  13 years agoPost 4
jameswill4

rrVeteran

Pineville KY

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I am using a 8103 in Fm modulation not the pcm so I do not think they have a fail safe I am correct It just glitches. right? I am going to put a new throttle servo in and change the switch and battery and see what happens. I will post the results. any other ideas? Thanks for the quick responses guys!!!

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