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CarbonXtreme . Midland Helicopters . HeliProz

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Radio - Servo - Gyro - Gov - Batt > Spartan DS760 Gyro - Horrible Drifting
 
 
Rockohaulic
Elite Veteran
Location: Valencia, CA, USA, 3rd Rock from the Sun

So the gyro is really great in piros, and it stops on a dime. But I found out that mine is drifting horribly today.

I was in an inverted hover on the deck, and the tail was drifting quickly requiring lots of corrections. I flipped her over, and put her into a standard tail in hover. The nose was drifting horribly to the left.

Badraptor was with me and recommended I put her into a hover, and then without touching the left rudder stick, to use my aileron to move the heli left and right. Holy cow did that open my eyes! When I went right and then brought her back in front of me, the tail had drifted 45 degrees counterclockwise (nose left) to where I started! This was horrible!

I noticed the same thing with multiple flips today. After about 5 flips or so, she was 90 degrees to where I started!!!

My 401 holds better than this!!!!

So what can I do to stop the drifting??? Is there anything I can do without the advanced menu??? Is there even something to adjust for drifting in the advanced menu???

God I hope so, this was a huge letdown today!!!

I got a helicopter for my girlfriend,
It was a good trade!
04-20-2008 12:19 AM
 
 
Yug
rrProfessor
Location: UK. Herts

Gyro mounting. Sounds like a vibes issue.

Vegetable rights and Peace
04-20-2008 12:36 AM
 
 
cdrking
Elite Veteran
Location: Seattle

Which helicopter?

Jeff

To hover is divine, the alternative is rather PLANE.
04-20-2008 12:53 AM
 
 
QuickSilver
Veteran
Location: Cherry Hill, New Jersey

Spartan

I flew the snot out of a friends T-Rex 600 Nitro and the tail was rock solid no drifting at all.

Kyle

Life is not measured by the number of breaths we take, but by the moments that take our breath away.
04-20-2008 12:57 AM
HOMEPAGE  
 
 
Rockohaulic
Elite Veteran
Location: Valencia, CA, USA, 3rd Rock from the Sun

It's on an Xtreme 50 nitro.

I don't think it was a vibration issue. The heli wasn't vibrating any worse than normal, and I've flown with 401s and a CY Solid-G, and they didn't drift.

I got a helicopter for my girlfriend,
It was a good trade!
04-20-2008 01:01 AM
 
 
cdrking
Elite Veteran
Location: Seattle

I would try some new foam mounting. Also if you have it strapped down for a backup the strap could be too tight. I would also double check the settings.

Jeff

To hover is divine, the alternative is rather PLANE.
04-20-2008 01:08 AM
 
 
raptorheli2
Elite Veteran
Location: rip off britain and no changing it

drift normally means vibes OR gyro mounted to hard.

if you flip and it rotates about 45 deg, that isn't drift. thats way more than drift. thats not holding. i would guess your using too long an arm and the gain is too low.

i would go in a hole on the servo and try again. if that fails then i would remount the gyro on softer tape. if your not using the metal plate, put it on.

i assume you don't have the usb lead to check a few things in the software?

cheers

p.s nose going left is normally a sign of vibrations


www.waterfoothelis.com
04-20-2008 01:09 AM
HOMEPAGE  
 
 
QuickSilver
Veteran
Location: Cherry Hill, New Jersey

Gyro

It could also be caused by a motor thats not tuned properly causing it to four stroke CSMs Rev Lock was known for this. When the motor loads up then unloads the gov would try to compensate.
Just a thought

Kyle

Life is not measured by the number of breaths we take, but by the moments that take our breath away.
04-20-2008 01:14 AM
HOMEPAGE  
 
 
cdrking
Elite Veteran
Location: Seattle

Quote 
nose going left is normally a sign of vibrations
Just curious why it would go LEFT, if it's associated with vibs?

Jeff

To hover is divine, the alternative is rather PLANE.
04-20-2008 01:17 AM
 
 
ckoelliker
Key Veteran
Location: St. Simons, GA

Have you tried it in rate mode to see if it is doing the same thing?
04-20-2008 01:20 AM
 
 
Rockohaulic
Elite Veteran
Location: Valencia, CA, USA, 3rd Rock from the Sun

The gyro is brand new and mounted correctly on its tape. Fist is the think foam tape, then the steel plate, then the thin tape, then the gyro.

It is not strapped down, so it is mounted perfect.

I have a very hard time believing it's vibrations. This gyro should hold better than a 401 which doesn't seem to be as sensitive to any vibrations.

I think something much different is causing this. Plus there is so much drift. I can't believe it moves so much so quickly.

I got a helicopter for my girlfriend,
It was a good trade!
04-20-2008 01:20 AM
 
 
raptorheli2
Elite Veteran
Location: rip off britain and no changing it

the nose going left is precission drift....normally. i.e the gyro wobles and detects a slight rotation, but because of this it can't hold.

progression was the wrong word above, sorry.

however as i said IF it moves 45 degrees that is not drift. thats not holding.

since you don't have the usb lead i would try going in a hole and put the gain up and re-test.

cheers


www.waterfoothelis.com
04-20-2008 01:28 AM
HOMEPAGE  
 
 
baddraptor
Elite Veteran
Location: valencia, ca- usa

It is engine vibes. Your fuel was foaming a little.

**Unattended children will be givin a shot of espresso and a puppy**
04-20-2008 01:29 AM
 
 
raptorheli2
Elite Veteran
Location: rip off britain and no changing it

as badraptor says you have vibrations so fix that first before messing with the setup then i think would be best bet.

oh, another thing, can you post a picture of how/where it is mounted at all?

cheers


www.waterfoothelis.com
04-20-2008 01:37 AM
HOMEPAGE  
 
 
Divot
Veteran
Location: Mesa, AZ

Any chance you rebinded your 9303 with a touch of rudder trim?

I have done this before (not the 760 thou), after rebinding all was well.
04-20-2008 03:06 AM
 
 
robhurlin
Veteran
Location: Pretoria, South Africa

The Spartan needs to be set up for each heli. Are you sure you have set it correctly for the servo you are using? Did you rack the gain up until it started hunting and then back off until it stopped? It sounds like your gain (& I agree, servo arm length) could be out.\

Its a fantastic gyro - I have one on my 'Rex 450SE, but I was unhappy the first day out. It needed a few flights to get set up properly, then it was OUTSTANDING. The best thing is to get the USB cable and program it properly, you need to adjust the deceleration to get a nice sharp stop, etc.

Rob.
04-20-2008 07:58 PM
 
 
Louisiana Helicam
Key Veteran
Location: West Monroe, LA

Well, what did you figure out?

Formerly Viperhawk
www.louisianahelicam.com
05-22-2008 05:04 PM
HOMEPAGE  
 
 
Rockohaulic
Elite Veteran
Location: Valencia, CA, USA, 3rd Rock from the Sun

Haven't flown that bird much. I did fly it at the San Diego fun fly, and it is still vibrating a lot.

I did set it up in rate mode, and that helped. I also recalibrated it. Oh - and I mounted it with 2 layers of the normal 3M foam tape (same stuff as Solid-G). Curtis Youngblood and another fellow were at my station and helped me out. That was cool. As you may know, Curtis helped me out with my Solid G on my Trex 600N.

Anyway - Worked better, and I am going to get some flight time this weekend at the Bakersfield fun fly.

After that, I'm going to pull the engine again and try one more time to get the runout down on the fan hub and clutch.

I got a helicopter for my girlfriend,
It was a good trade!
05-22-2008 05:36 PM
 
 
helimatt
Elite Veteran
Location: Lafayette, IN

Quote 
the nose going left is precission drift....normally. i.e the gyro wobles and detects a slight rotation, but because of this it can't hold.

Precession does not apply to the piezo gyro function- there is no rotating components in the gyro.

Still have to agree it sounds like a vibrtion/mounting issue at the core, but don't overlook that your gyro could be bad. I had a 401 that drifted no matter what- the gyro itself was in need of servicing.

Never, ever, ever, ever give up.
05-22-2008 05:49 PM
 
 
raptorheli2
Elite Veteran
Location: rip off britain and no changing it

helimatt....the gyro doesn't have moving parts but vibration effects it in the same way....

cheers


www.waterfoothelis.com
05-22-2008 05:59 PM
HOMEPAGE  
 
 
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Radio - Servo - Gyro - Gov - Batt > Spartan DS760 Gyro - Horrible Drifting
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