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HomeAircraftHelicopterFlybarless Rotor Head SystemsOther › FLB Initialization Question
02-05-2010 07:37 PM  8 years agoPost 1
blbills

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Provo, UT

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This question is specifically directed to the vbar group but I'm sure that the answer would apply to all makes of flybarless units.

I have noticed that on some helis the FLB sensor when installed is perfectly perpendicular to the main shaft but because the heli has a slight forward stance while on the ground that the sensor is not level with the ground. (eg Protos, Rigid, etc...)

Does this "non-level" state affect the calibration of the sensor when initialized?

I haven't seen any mention of this so I was just curious if anyone else has run into this issue.

Brian

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02-05-2010 07:39 PM  8 years agoPost 2
Jag72

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South of Boston

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Sensor...
I've never had an issue with that...but obviously you try to mount the sensor on the heli level...

My Roxxter has a VERY noticeable forward lean to it(sits very low in front) and it initializes and flies just fine ...

Anthony

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02-05-2010 07:42 PM  8 years agoPost 3
blbills

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Provo, UT

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Jag72,

Have you tried initializing your Roxxter while holding it so the sensor is level with the ground?

I would be curious if you could tell the difference in flight.

Brian

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02-05-2010 07:47 PM  8 years agoPost 4
Justin Stuart (RIP)

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Plano, Texas

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I think for initialization of the V-bar, it just has to be steady, not necessarily level. I think what the gyro is doing is to "zero" itself for variations cause by temperature and such. I have initialized mine with the heli 30 degrees to the side and it worked fine for the flight.

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02-05-2010 07:53 PM  8 years agoPost 5
Jag72

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South of Boston

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Init..
Never tried that...like Justin said..I don't think it really matters if it is level...just not moving during init...

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02-05-2010 07:54 PM  8 years agoPost 6
MrMel

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Gotland

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Justin is right, doesnt matter if its level compared to the ground or not, all logos has mainshaft at an angle when standing on the ground for sample.

The important thing is that sensor is mounted 90 degree to the mainshaft.

Gone fishing..or hunting..or something
My site: http://heli.dacsa.net - VBar videos and more

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02-05-2010 07:58 PM  8 years agoPost 7
blbills

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Provo, UT

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I had an experience when I was just setting up my mini-V in my 500 where I initialized it while the mini-v was just hanging out the back at an approx. 45 degree angle to the ground. I was so excited to go fly that I mounted it up and forgot to re-initialize it while level.

That flight almost ended in disaster. Completely uncontrollable and nearly tipped it over on take-off (scraped the bottom of my blades and destroyed my tail blades) EDIT: it flew fine prior to the tweek that I performed.

While this is a rather extreme example, I feel that the initialization process is affected to some small degree if the sensor isn't perfectly level...

Brian

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02-05-2010 08:01 PM  8 years agoPost 8
cdrking

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Seattle

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I don't believe that initialization is the issue, I think the issue would be in-flight with the sensor tilted. Maybe the auto-trim function or optimizer would compensate, I don't know.

I saw a post somewhere recently how MrMel noted that the T700 sensor mount is tilted slightly.

I wonder what the tolerances are with sensor mounting. Can it handle/compensate for say a 1 degree tilt or 2 or 3?

This would be a great question for the V-stabi forum.

Jeff

To hover is divine, the alternative is rather PLANE.

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02-05-2010 08:01 PM  8 years agoPost 9
cdrking

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Seattle

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He posted before I finished my post.

To hover is divine, the alternative is rather PLANE.

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02-05-2010 08:04 PM  8 years agoPost 10
MrMel

rrProfessor

Gotland

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I saw a post somewhere recently how MrMel noted that the T700 sensor mount is tilted slightly.

I wonder what the tolerances are with sensor mounting. Can it handle/compensate for say a 1 degree tilt or 2 or 3?
Not really, each degree will give interaction.
How much it takes before you can feel it is another story.
(think the tolerance on the gyro is something like 1% anyway)

I usually spot a "inproper" mounted sensor while doing tight tictocs.

Gone fishing..or hunting..or something
My site: http://heli.dacsa.net - VBar videos and more

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