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HomeAircraftHelicopterAerial Photography and Video › Eagle tree systems Alt sensor
01-15-2009 09:12 PM  9 years agoPost 1
Russ Delaney

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Ashbocking, Suffolk, UK

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Anyone had any experience with this unit?
I have been looking at an altitude hold using the zlog sensor and a board made in Spain.
I am interested to know if anyone has been succesfull in making an altitude hold using the Eagle Tree system V3 sensor??

Team Quick UK Pilot 20

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01-16-2009 12:21 AM  9 years agoPost 2
borneobear

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Kuala Lumpur, Malaysia.

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I've asked the same question at RCG:

http://www.rcgroups.com/forums/show...5&postcount=176

Feedbacks I got from the very few that tried it (on helis) - using the Zlog - didn't sound too good.
So I gave up on it.

I'd love to get something that actually works tho.

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01-16-2009 12:37 AM  9 years agoPost 3
Russ Delaney

rrApprentice

Ashbocking, Suffolk, UK

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Thanks for the reply, looks like I might have to try it out using the Eagle Tree sensor instead of the Zlog.

Team Quick UK Pilot 20

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01-16-2009 12:39 AM  9 years agoPost 4
Russ Delaney

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Ashbocking, Suffolk, UK

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There must be someone out there who has come close to succesfully mastering altitude hold??
What about ultrasonic measuring sensors?

Team Quick UK Pilot 20

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01-16-2009 12:47 AM  9 years agoPost 5
borneobear

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Kuala Lumpur, Malaysia.

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There's also the ArduPilot that is suppose to hold altitude using GPS:
http://diydrones.com/profiles/blogs...p-ardupilot-for
http://www.sparkfun.com/commerce/pr...roducts_id=8785

But its currently out of stock and I've yet to see anyone using it on a heli.

From what I recall, one of the guys that tried the barometric sensor (e.g. eagle tree, z-log) reported alt hold was very erratic, changes willfully depending on temperature and would be good to hold (randomly) from 5 feet to 20 feet.

Took him the whole day to set the thing, only to find it goes crazy again for no reason. Very disappointing.

IMHO, altitude hold should be via GPS, not barometric, and via throttle control. Just need to find someone that sells it.

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01-16-2009 07:41 AM  9 years agoPost 6
Russ Delaney

rrApprentice

Ashbocking, Suffolk, UK

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It sounds like you are doing the same search as me.
If we both keep looking i am sure we will find something.

I agree the barometric sensor would not be so accurate.
I fly full size helis and we have: Bar alt hold, accurate to +- 30ft
Rad alt hold is much more accurate, i think we should look more towards utrasonic? obviously fitting radar to RC would be impractical!!
I have been looking at the ultrasonic measuring device used in the building trade, some will measure 20mts +
If we can somehow hack into that?

I think GPS is way to slow for RC and the height given from GPS can be eratic at the best of times?

Any electronic experts out there?

Team Quick UK Pilot 20

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01-16-2009 11:26 AM  9 years agoPost 7
borneobear

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Kuala Lumpur, Malaysia.

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There is a guy at RCG that has successfully built a Trex450 that does have a fully functional alt hold. However, he has not commercialized it yet and his test video(s) showed it hovering only around 50 feet high.

As for ultrasound, I think someone has tried it (also at RCG), but I can't recall if it was a success (probably not).

The Helicommand Profi has an alt hold function, but up to a certain height. Can't recall what it was, but not the 400 feet + 20 feet that I need.

Will continue looking.

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01-16-2009 03:30 PM  9 years agoPost 8
KDoherty

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Mississauga, Ontario, Canada

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Altitude hold from Spain
I have built Eladio's (Spain)altitiude hold kit and tried it on a helicopter. It simply updates too slowly to be of any use in AP. Altitude will jump quite a bit both up and down. It will certainly command your attention :-)

I have talked to him about this but the issue is in the update frequency of the Z-log unit.

It's nothing $10,000 won't cure.

Kim.

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01-16-2009 05:06 PM  9 years agoPost 9
Russ Delaney

rrApprentice

Ashbocking, Suffolk, UK

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Hi Kim
Thats why I bought the Eagle tree instead of the Zlog.
I agree i would love to throw $10,000 dollars at it!!

Its possibly to do with the rotor downwash strirring up heat from the engine. As a 2deg temp change would equate to about 1000ft !!
Roughly with standard ICAO atmosphere.

I was going to try mounting the unit on the end of the tailboom and just try and shelter it somehow from the tail rotor thrust. (away from heat)

Because i want something to assist in AP in only needs to work in the hover, hence my thoughts on the ultrasonic sensor.

Team Quick UK Pilot 20

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01-20-2009 10:38 AM  9 years agoPost 10
Russ Delaney

rrApprentice

Ashbocking, Suffolk, UK

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Eagle tree systems
Does anyone know why they dont reply to emails???
I have sent emails and got the automated message recieved but dont get an answer!!
I check my spam folder as well just to be sure but no replies

Team Quick UK Pilot 20

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01-20-2009 03:23 PM  9 years agoPost 11
borneobear

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Kuala Lumpur, Malaysia.

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Try PM-ing Bill of Eagle Tree at RCG :

http://www.rcgroups.com/forums/member.php?u=23186

Meantime, I've started a thread at DIY Drones and getting some leads.
http://diydrones.com/forum/topics/a...844Comment56159

Good luck

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01-20-2009 04:30 PM  9 years agoPost 12
just4fun2

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torrance

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why are you guys using air density sensor on a heli? too many variables why not use thier gps unit?

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01-20-2009 05:17 PM  9 years agoPost 13
Russ Delaney

rrApprentice

Ashbocking, Suffolk, UK

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The refresh rate on GPS would be no were near fast enough for altitude hold on a heli. I agree The barometric method has to many variables but would like to experiment.
I still think ultrasonic would be the best way unless someone makes a small enough radar to fit my heli?

Team Quick UK Pilot 20

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01-20-2009 07:06 PM  9 years agoPost 14
vrwired

rrVeteran

Boulder County, CO

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Would an Ultrasonic Transducer be able to to work at that distance?.. pretty far.. hmm...

Any way to do it with a laser diode.. I would guess reflection would be the issue with a laser..

JR GSR260 - Mark IV Cam Mount
Trex 600NSP
Trex 600 to 700 Stretch
Trex 450SE
Hornet X3D

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01-20-2009 07:50 PM  9 years agoPost 15
Russ Delaney

rrApprentice

Ashbocking, Suffolk, UK

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I have seen an Ultrasonic sensor that will measure 20mts not massive i know but its not far off what I need for AP.

Team Quick UK Pilot 20

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