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Consistent Glitches During Flight and Ground Operations???

Old 03-30-2004, 04:56 PM
  #1  
hilleyja
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Default Consistent Glitches During Flight and Ground Operations???

Mike, I've had my Aeroworks X300L Profile for about 6 months but have not flown it that much, primarily due to weather.

I have always had problems that appear to be due to intermittent interference, i.e., momentary glitches that cause the control surfaces (all of them) to jump. This has happened both on the ground and in the air (I'm not sure if glitching only occurred during engine run). I judge them to be consistent in that they have occurred during each flight I've had with this airplane since day one. It made for some rather hair-raising flights on occasion, but thankfully no crashes. I have also, on two occasions, have had to reset my airlon servos (Hitec digital servos reset with Hitec servo programmer -- re-center and reset the endpoints) after an extensive flying pause because when fired up the neutral position was changed.

Configuration:

a) Aeroworks X300L Profile
b) Moki 180 -w- Bisen Sports Muffler
c) (2) Hitec HS-5625s on the airlons with 24" extensions (carbon rod pushrods/4-40 wire, dubro ball-joint clevis)
d) (2) Hitec HS-5625s on the split elevator with 36" extensions (carbon rod pushrods/4-40 wire, dubro ball-joint clevis)
e) (1) Hitec HS-5645 on the rudder with 36" extension (carbon rod pushrods/4-40 wire, dubro ball-joint clevis)
f) (1) Hitec HS-425 on the throttle
g) (1) Hitec Super-Slim 8 FM RX, channel 38
h) (1) MPI Switch
i) (1) 3500mah NIMH RX battery pack (generic brand)
j) Futaba 9C TX (Futaba FM channel 38 module)

This is what I have done to date to try to narrow down the problem:

1) I suspected my servo leads where too long. The tail has 36" extensions and the airlon servos have 24" extensions on them. The extensions are not what you call heavy-duty but are a higher guage than the servo leads themselves. I tried twisting the airlon servos -- I really don't think this did a thing.

2) I also suspected my original RX might be intermittent -- could not remember whether it had ever been in a crash. I replaced the RX with a brand new one (I'm not sure I used a new Xtal here), no change.

More thoughts to consider:

1) The 3500mah NIMH RX battery pack might be causing a over-voltage problem. Two things I can try:

a) Switch to an 4.8 pack
b) Changeout MPI switch for a MPI Miracle switch which has a voltage regulator built in.

2) Channel 38 might be a problem (other members on this channel don't seem to have problems and I have other airplanes on this channel that I might have had a problem but no where near the level I have on this airplane) -- change to 35 and make sure the Xtal is brand new.

Any other ideas? Does the problem with the airlon servo (actually it has been only one of the airlons, I have reprogrammed both each time to keep them in sync) sound familiar to you?

I am guessing that the over-kill battery pack is a potential problem. I am also guessing it might just be a bad Xtal in the RX. I am rather concerned that twice the left airlon servo's programmed center position changed after the airplane sat idle for a few weeks.
Old 04-06-2004, 07:39 PM
  #2  
mglavin
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Default RE: Consistent Glitches During Flight and Ground Operations???

ORIGINAL: hilleyja

This is what I have done to date to try to narrow down the problem:

1) I suspected my servo leads where too long. The tail has 36" extensions and the airlon servos have 24" extensions on them. The extensions are not what you call heavy-duty but are a higher guage than the servo leads themselves. I tried twisting the airlon servos -- I really don't think this did a thing.
22 gauge HD servo extensions are a must IMO.

2) I also suspected my original RX might be intermittent -- could not remember whether it had ever been in a crash. I replaced the RX with a brand new one (I'm not sure I used a new Xtal here), no change.
The problem maybe generated by some sort of EMI. Possibly something harmonic like a metal to metal abrasion; look real hard here!

More thoughts to consider:

1) The 3500mah NIMH RX battery pack might be causing a over-voltage problem. Two things I can try:

a) Switch to an 4.8 pack
b) Changeout MPI switch for a MPI Miracle switch which has a voltage regulator built in.
The 6.0V battery is preferred. A regulator is not required.

2) Channel 38 might be a problem (other members on this channel don't seem to have problems and I have other airplanes on this channel that I might have had a problem but no where near the level I have on this airplane) -- change to 35 and make sure the Xtal is brand new.
The Xtal is an excellent inexpensive problematic source of the very conundrum you describe above...

Any other ideas? Does the problem with the airlon servo (actually it has been only one of the airlons, I have reprogrammed both each time to keep them in sync) sound familiar to you?
The reprogramming maybe the result of voltage degradation, of the control signal under load. Or then again you may have other problems. Since you have the programmer connect it to an aileron servo for instance less the extensions directly with the surface attached use the “auto servo test” feature of the programmer. Allow the programmer to exercise the servo for twenty minutes or so and see if you duplicate the problem. Were trying to heat things up to see what happens during flight loads.

I am guessing that the over-kill battery pack is a potential problem. I am also guessing it might just be a bad Xtal in the RX. I am rather concerned that twice the left airlon servo's programmed center position changed after the airplane sat idle for a few weeks.
Most of the time I hear of problems as your describing we find the extensions, wyes and such are not up to the task or are simply of poor quality and offer high electrical resistance. In some cases the servo is at fault. Digital servos require a top notch power distribution system.

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