servos

I have been flying the bird with a JR 347 (72MHZ) with the new berg reciever , 8 270 mah sanyos and cirrus CS-20BB servos and not had so much as a twitch wit this setup. Now if I can keep this bird from falling out of the sky things wil be great.
happy flying RIPPERXL

I'm using the Skyhooks & Riggings RX72 receiver, 9V Tadiran battery packs, Cirrus CS10 servos. I'm definitely getting intermittent glitches. I'm going to try HS50 servos.

Tried all sorts of combinations of battery packs (NiCd, Lithium, NiMH). Still getting glitches. Also tried FMA S-90 servos without luck. Going to have to keep trying servos.

Forgive my ignorance (I bow to the more technically oriented among us) - What is the difference between the startup current and the load current? The Wes-Technik light servos are rated at less than 100 mAh under load. Is this a viable servo option for the Piccolo?

[pgoelz]

I'm using Hitec HS-50s and as far as I can see they are not glitching due to the BEC output, although it does drop as much as 2 volts on accasion.

I am using the Berg6 receiver and I have an occasional glitch (like once every two flights, and only for a few milliseconds) that I believe to be RF induced. The receiver is sandwiched close to a lot of noise producing circuitry, and the antenna is shorter than usual. These seem to add up to a difficult RF environment and shorten the reliable range quite a bit. Not that it matters much to a heli this small!



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Paul Goelz
pgoelz (at) eaglequest (dot) com

AS posted on another topic in this forum::

GWS servos use 450mA peaks going one end to the other during 2ms .
the 5V line drops ONLY 1mV on full servo load.
What I discovered while doing these measurements : the pico board is VERY sensitive on electrical connections.
I explain myself:
On connecting the probe of the Osciloscope
to the Picoboard, I experienced very heavy
glithes which gave Full power to main rotor
and tail rotor. This only for a fragment of
a second , but enough to do damage to the
reduction pinion on the motor.(rotor was not turning and then received full power)
For me this means that the receiver is giving
bad output signals to the ESC's which translate this to full power.
I flight , I don't have glitches but this
testing can point to some electrical guidance parts ,moving together , giving
the interference to the receiver.
Another thing , one of my fellow fliers,received his piccoboard back from Ikarus: receiver backplane now sitting the otherway round against the gyro and ESC board.neatly isolated with foam and alu protection.BUT... a lot of wiring AND
a lot of GROUND cables enshuring a better
GND for the whole Piccoboard .
Perhaps this is the reason why on some older
boards , glitches are made .
koen VG

I finally got my glitching solved. The Hitec HS50 servos did not make a difference (Oh well, I can use them for something else). After much troubleshooting, it was the receiver all along. I had glitches with the following receivers: original Piccoboard rx, Berg6 replacement from Ikarus USA, FMA Tetra, Skyhooks&Riggings SR72-F. I put a Hitec Micro555 and the heli is now glitch- free and rock solid. All these receivers don't work? There's gotta be something wrong with the Piccoboard's design. The final setup is as follows:

Hitec Micro555 rx (case removed, antenna shortened)
Piccoboard (72mHz, Futaba version)
Cirrus CS-10 sub-micro servos
9V Tadiran battery packs

AUW is 215 grams. Flight time is 11-14 minutes. Hope this helps some people out there...