Lama 3

Pappy K · Posted: Tue Aug 30, 2011 8:05 pm Post subject: Lama 3

I thought I had read a forum post on this forum about the Lama 3 - It was from a guy who was not overly impressed and said this 'copter was not for the beginner for a whole bunch of reasons; which he described. Can't find it anywhere - Does anyone remember it?

Barring that, does anyone else out there fly a Lama 3?

I have noticed I have 3 servos on this beast vice 2 on my other coaxials - It has one for "pitch". It also seems to indicate that the tail rotor has some other use the "looks"! I didn't think a coax used the tail rotor for anything BUT "looks". Can't see how it could have an effect as it is a very weak looking motor driving it.
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nick_onelove · Posted: Tue Aug 30, 2011 8:28 pm Post subject:

Wow, that thing looks pretty clever, I've never heard of a co-axial using collective-pitch!

The tail rotor is still just for looks though, it will probably spin from the downdraft of the main rotor wash.
_________________
Align: Trex 250 3GX + Trex 450 Pro with Vbar
Blade: 450 X, mCP X, 120 SR, mSR X, CX3, mCX2
Esky: Belt-CP X and V2 - Futaba: Heli-Max Axe 400
Walkera: V500D01, M120D01, V100D08, DEVO 8
Spektrum: DX8 - AMA #967873 - IRCHA #4095

platinum · Posted: Tue Aug 30, 2011 11:04 pm Post subject:

Interesting co-axial collective pitch (CCPM) also the drive system.

Using single brushless motor to drive two rotors turning opposite direction by synchromesh main gear, there is a set of planetary gears, transferring one direction input to two direction output synchromess (use synchromesh belt and pulley).
Look rather more complicate than the basic coaxial. Shocked

Note : this remind me for magyarbacsi's topic "converting gear drive to belt drive?"
http://www.electric-rc-helicopter.com/phpbb/viewtopic.php?t=4237&highlight=

platinum
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/Goal : relaxed flying with the least fixing. Very Happy

tombo242 · Posted: Wed Aug 31, 2011 5:58 am Post subject: Re: Lama 3

nick_onelove · Posted: Wed Aug 31, 2011 6:22 am Post subject:

This is the first hit when you Google "Lama 3":

http://www.helipal.com/walkera-lama-3-helicopter-2-4g-metal-edition.html

Lots of pictures there. I'm pretty sure there is no tail motor, the rotors are probably just loose and spin from the downdraft of the main rotor wash for looks.
_________________
Align: Trex 250 3GX + Trex 450 Pro with Vbar
Blade: 450 X, mCP X, 120 SR, mSR X, CX3, mCX2
Esky: Belt-CP X and V2 - Futaba: Heli-Max Axe 400
Walkera: V500D01, M120D01, V100D08, DEVO 8
Spektrum: DX8 - AMA #967873 - IRCHA #4095

platinum · Posted: Wed Aug 31, 2011 8:11 am Post subject:

FYI : Tail rotor that spins (but just for good looking) Very Happy

platinum
_________________
/Goal : relaxed flying with the least fixing. Very Happy

nick_onelove · Posted: Wed Aug 31, 2011 8:26 am Post subject:

Oh OK, my bad. What an interesting heli!
_________________
Align: Trex 250 3GX + Trex 450 Pro with Vbar
Blade: 450 X, mCP X, 120 SR, mSR X, CX3, mCX2
Esky: Belt-CP X and V2 - Futaba: Heli-Max Axe 400
Walkera: V500D01, M120D01, V100D08, DEVO 8
Spektrum: DX8 - AMA #967873 - IRCHA #4095

tombo242 · Posted: Wed Aug 31, 2011 4:25 pm Post subject:

Nice link Nick, thanks for that. My first three on google with 'Lama 3' are all Youtube. That link is way down the list. (Probably being in Portugal.)

Interesting machine that one. As you don't appear to be able to vary the power to the individual rotors, that tail motor must control the tail.

Facinating:

Tom.
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Keep Smiling Smile

Pappy K · Posted: Wed Aug 31, 2011 7:18 pm Post subject:

Platinum my man: Where are you getting all these fantastic pictures to do with the Lama 3? Do you have access to schematics for this 'copter? If you do PLEASE TELL ME WHERE TO GET THEM Exclamation

Tombo, I will take a couple of pictures of her innards tomorrow and post them. This is one mean beast and one which I think will fly outside without too much bother. In Fact, that is where I want to fly her next in a Big Paddock with NOTHING to bump in to except the ground Rolling Eyes

_________________
You can teach and Old Dog New Tricks -or-
Don't Give Up Until a Dead Horse Kicks You!

platinum · Posted: Thu Sep 01, 2011 6:45 am Post subject:

Pappy K · Posted: Thu Sep 01, 2011 9:01 pm Post subject:

Schematicss

If anyone out there wants some exploded schematics of the Lama 3; I have taken the effort to compartmentalize the various bits as well as reproducint the Parts Lists onto A4 size paper so that it is readable with the naked eye Smile

Be glad to forward the data to anyone via email - just send me an email requesting it. pappy_k@bigpond.com
_________________
You can teach and Old Dog New Tricks -or-
Don't Give Up Until a Dead Horse Kicks You!

Skyepuncher · Posted: Thu Sep 01, 2011 9:20 pm Post subject:

nick_onelove · Posted: Thu Sep 01, 2011 9:28 pm Post subject:

I'll take one Pappy, just to see your work. Very Happy

nick.onelove@gmail.com

Regarding rudder control: I think very little pitch change would be needed to change the reactive torque enough to yaw the heli. I doubt lift would be affected much. Have you actually flown it yet Pappy?
_________________
Align: Trex 250 3GX + Trex 450 Pro with Vbar
Blade: 450 X, mCP X, 120 SR, mSR X, CX3, mCX2
Esky: Belt-CP X and V2 - Futaba: Heli-Max Axe 400
Walkera: V500D01, M120D01, V100D08, DEVO 8
Spektrum: DX8 - AMA #967873 - IRCHA #4095

tombo242 · Posted: Fri Sep 02, 2011 9:52 am Post subject:

Got the pics in our share Dropbox Pappy. Thanks for them, what a facinating engineering project that machine is.

Having said that, I think that my current 2 co-axials are enough. (Great on windy days indoors!) I'll stick with CCP and fixed wing for now.

Tom.
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Keep Smiling Smile