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03-22-2009 02:48 PM  8 years agoPost 1
pgkevet

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Wales

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Engine GV-1 and Gyro

I thought I'd do this as a new thread.. may help others?

PGasser rebuilt. Did have a test hover last week then back on the bench and went through everything (I thought) again.

1)GV-1 and statorgator. I never used either although they were aboard Spectrs unused.

I'm not picking up any sensitivity reading with pull starts plug out on the GV-1. Likely cause? Poor earth? Faulty unit? Any easy test to run?

2)Engine

I'd intended to use the gov to tach heli. Fired up easy but as I slowly went towards half stick engine throttle back.. or rather the sounf started stumbling and dying away irregularly. Manual taching had it going through 1700rpm before that. I figured tis was engine way too lean. No temp gun with me but reset back to default needles and then had to richen a tad more than that. Weird when I hadn't changed the settings from pre-crash.

Even more weird is that I've obviously had to redo the linkages and before I had end points 100%. Now I've got them 115% and even when richened up so it ticks over nicely at 1/3rd to 1/2 trim it getting to 1700 in the hover at 24% throttle. This is only a stock PUH231.

Any ideas why my throttle curve is way lower than before? I was also pikcing up 100rpm with just 2% change in throttle at the hover

3)Gyro

I went right through the gyro menu's and tail linkages this morning before going to the field but tail is wandering. No relationship tp engine kicks/tones. Just nowhere near solid. Obviously headspeed was ample.

Gyro is on new zeal on the radio tray just in front of the tank but all my el;ectronics are on a slope above it. All wires are in servo braid or plstic curly wrap but do route past it.

Crash damage? or do they just die? Electrical interference? No significant frame vibrations in the hover. Amp read gain 38%A. Was sl better when I upped to 45% just to try. Zeal pad loose even if doen;lt feel like it? Better location?

As ever all comments appreciated:

pgk

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03-22-2009 03:09 PM  8 years agoPost 2
Doug Darby

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Dallas, Texas

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Just a couple of comments. Be sure and reset the limits in the GV1 menu if you changed linkage adjustments at all. Also the 100 RPM increase with only 2% change indicates to me that you have adjusted the linkage so it is in the sensitive portion of the throw on the carb butterfly at the RPM you are trying to adjust. Most say the first 1/2 of the butterfly travel yields the greatest change in engine RPM.

I also don't think the Stator Gator will give a sensitivity reading. I think that only works with the magnet type sensors.

Easy test is to fire it up and see if the display on the GV1 is reading the idle RPM

doug

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03-22-2009 04:54 PM  8 years agoPost 3
pgkevet

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Wales

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Be sure and reset the limits in the GV1 menu if you changed linkage adjustments at all.
GV-1 hadn;t been used before and was set up as per futaba's instructions and my FG12... although that's not to say errors by me happened. It just wouldn't display 'ON' just 'OFF'.. and I assumed that was because it wasn;t picking up it's sensor??
Also the 100 RPM increase with only 2% change indicates to me that you have adjusted the linkage so it is in the sensitive portion of the throw on the carb butterfly at the RPM you are trying to adjust.
I'd have assumed that too..except that it was set up similarly to before (except for an increased travel end points - which I still don't quite understand on the same horn).......
I also don't think the Stator Gator will give a sensitivity reading. I think that only works with the magnet type sensors.
Which i may try....but you'ld think if the gator works it oughta display 100% if giving the same type signal???
Easy test is to fire it up and see if the display on the GV1 is reading the idle RPM
..Gov display stayed 'off' anyway...
..going to have to go through it all again....

pgk

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03-22-2009 06:49 PM  8 years agoPost 4
TaleGunner

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Deer Park WA

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I too am having some problems with a new GV-1 and stator gator but I am sure it is me and my setup that is the issue.

Anyhow In the instruction sheet that came with my stator gator it says

QUOTE: The sensitivity will not display on the GV-1. Follow the MFG directions for the gov.

Hope this helps you.

now if some one could make a step by step setup directions for the GV-1 and X9303 maybe I could figure out what I'm doing wrong

CRASH! GLUE! REPEAT!
Spectra-G, Ion X-2

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03-22-2009 07:54 PM  8 years agoPost 5
pgkevet

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Wales

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QUOTE: The sensitivity will not display on the GV-1. Follow the MFG directions for the gov.
'fairy nuff'..if I figure it out I'll let you know..

So that's just gyro and engine to understand...

pgk

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03-22-2009 10:21 PM  8 years agoPost 6
pgkevet

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Wales

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now if some one could make a step by step setup directions for the GV-1 and X9303 maybe I could figure out what I'm doing wrong
can't speak for your tx but on my FG12 it looks to all the world as if all the settings including a gov on/off switch can be set within the gov menu. BUT it turned out that not only did i have to initiate the 'governor2' function on channel 8 but had to assign it a switch as well..and then had to reverse that on the GV-1 for the way i wanted.

But now stickswitch works in all idle states and hold and off that switch - or it says it goes (firing up on the diningroom table is pushing it even for me)

If the gator works then it ought to be good to go. Raja hidden menu stuff done too..

Just the engine/carb business to figure..and the gyro..

pgk

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03-23-2009 05:10 AM  8 years agoPost 7
Doug Darby

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Dallas, Texas

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When you go through the set up screens on the GV1 (pushing the little Function buttons) leave the RPM screen showing on the display.

I have my GV1 on a switch and even though I have it turned OFF, there is power to the GV1 and when I start the engine (with the GV1 switched to off) the RPM shows on the display showing that the STator Gator is working (however it does). If with the RPM display on the GV1 when you start the engine, and it reads "0rpm" then I would say you have a stator gator problem.

doug

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03-23-2009 07:59 AM  8 years agoPost 8
pgkevet

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Wales

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If with the RPM display on the GV1 when you start the engine, and it reads "0rpm" then I would say you have a stator gator problem
Understood! Hopefully get a chance to fire up today nd see. I'm sure the issue was the 8th channel which I think I've sorted.

Still need to figure out why the gyro is wandering without airframe vibes and why the engine was so lean with the carb just pulled off and replaced unchanged. BUT it had cracked the air filter cover..so it did get jarred.

Gyro location on the predator isn't ideal.. too forward but there isn't another good location....?

pgk

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03-23-2009 11:46 AM  8 years agoPost 9
pgkevet

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Wales

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..forcast was 23 gusting to 40mph... having been to the filed I have no reason to doubt it!!!

Did fire up and GV-1 reads rpm.. idling at 540 and on the rich side.

I also remounted the gyro on fresh zeal and velco-ed the cable routing near it to the sides.

I'll try and post pics of my electronics placements later.

Frankly wasn;t going to run it up to the gov kicking in in gusts like that and an unknown gyro function... will spray up a canopy instead

One other thought

Next time I do any rebuild it might be worth using 2 top left frames instead of a L&R and then making up a gyro mount up on top with a protective cover in case of bent flybar strike. Would get it much closer to the main shaft.

pgk

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03-23-2009 03:45 PM  8 years agoPost 10
pgkevet

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Wales

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electronics pics.. not so good quality - mobile phone camera

pgk

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03-23-2009 05:39 PM  8 years agoPost 11
Doug Darby

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Dallas, Texas

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Here are a couple photos of my electronics lay out. I have my gyro in the front also with so real issues with it caused by location.

doug

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03-24-2009 03:16 AM  8 years agoPost 12
Fixit

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UK

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Try getting rid of the honeycomb and get the gyro down on the tray away from the servos, the gyros receiver is surrounded by servos.
I also think they have less chance of getting knocked off in a crash on the tray.

I only like to fly gassed up

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03-24-2009 07:49 AM  8 years agoPost 13
pgkevet

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Wales

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Try getting rid of the honeycomb and get the gyro down on the tray away from the servos, the gyros receiver is surrounded by servos.
The gyro is under that slope on the tray, just in front of the open section above the tank..that's as close to the mainshaft as it can be fitted?..the amplifier as mounted was my best compromise to keep it away from the bundle of rx wires and it lived in the same position before the crash without issues.

The steel honeycomb makes cable ties and velcro easy to fit and might have some shielding properties?

Almost all wires are either braided or spiral wrapped to protect and separate...

It also means that old eyes and creaky backs can see the displays

pgk

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03-24-2009 11:48 AM  8 years agoPost 14
j.8

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Denmark

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Hi pgkevet

To rule out a vibration issue, trie to strap down
the gyro like Doug has done with his spartan, if
it helps,well look for the reason, it could be some
engien tuning, specially since you had to redo the linkage,
and needles, perhaps you`ll need to richen it a bit more

In case of electric interference as fixit suggests,
move it away from the servos and as fare away from the
lipo regulator as possible.

And due to the steel honeycomb, I would do some serious
range check. Some 2,4 Ghz are very sensible when having
the antennas close to carbon/steel, just to make sure you
got a good solid link.

Regards Bo

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03-24-2009 12:52 PM  8 years agoPost 15
pgkevet

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Wales

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J8

Gyro Under the honeycomb it's on zeal and I velcoed over after the last test flight anyway. It's the statorgator at the front.

I always range check before every first flight of the day.. and on the gassers with a full walk around.

Location of the aerials is one horizontal just below the tray and one vertical down the front of the fuel-tank (and it's futaba not specktrum).

I'm glad to say that I've never had a range check issue or flight issue on any of them.

Agree it may be engine retune .. which will take me a bit of better weather.. If it is location to regulator and other stuff then it's a new issue with them. Only new items on board are the gator and GV-1 and they are both away from the gyro and amp.

I'm hoping it'll just be OK now.... but need winds below 30mph for a test

pgk

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03-24-2009 01:16 PM  8 years agoPost 16
j.8

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Denmark

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Hi
Gyro Under the honeycomb it's on zeal and I velcoed over after the last test flight anyway. It's the statorgator at the front.
Ok I could`nt see the gyro, I know the Stator gator
... Only new items on board are the gator and GV-1 and they are both away from the gyro and amp...
I have no interference issues with the Stator gator, and mine
is pretty close to the antenna, only thing I ever had with the SG,
was the plug that goes into the kill wire came loose, but after a
resolder no problem. I have had some ovrespeeding issues with
the Gv-1, but that`s due to engien tuning, a little to lean
low needle, in my case.
but need winds below 30mph for a test
Same thing here

Regards Bo

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