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Pappy K
Extreme 3D
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Joined: 01 Nov 2010
Posts: 177
Location: Goolwa, South Australia

PostPosted: Tue Aug 30, 2011 8:05 pm
PostPost subject: Lama 3
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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
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Joined: 01 May 2011
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Location: Mendocino County, CA, United States 21 years old

PostPosted: Tue Aug 30, 2011 8:28 pm
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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.
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platinum
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Joined: 31 May 2011
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Location: Bangkok Thailand

PostPosted: Tue Aug 30, 2011 11:04 pm
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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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tombo242
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Joined: 04 Nov 2008
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Location: Santo Estêvão, East Algarve, Portugal. Now 82, but still feels 22.

PostPosted: Wed Aug 31, 2011 5:58 am
PostPost subject: Re: Lama 3
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Pappy K wrote:
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.


I've searched and cannot find a picture of a V3 Lama with 3 servos. They all show the usual 2. Can you give us a pic of your V3 showing the 3 servos, then we may be able to help.

I believe that the tail motor is just to spin the blades and has no effect on control. Makes it look good though!

Tom.
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nick_onelove
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Joined: 01 May 2011
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Location: Mendocino County, CA, United States 21 years old

PostPosted: Wed Aug 31, 2011 6:22 am
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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.
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platinum
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Location: Bangkok Thailand

PostPosted: Wed Aug 31, 2011 8:11 am
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FYI : Tail rotor that spins (but just for good looking) Very Happy



platinum
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nick_onelove
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Joined: 01 May 2011
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Location: Mendocino County, CA, United States 21 years old

PostPosted: Wed Aug 31, 2011 8:26 am
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Oh OK, my bad. What an interesting heli!
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tombo242
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Location: Santo Estêvão, East Algarve, Portugal. Now 82, but still feels 22.

PostPosted: Wed Aug 31, 2011 4:25 pm
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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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Pappy K
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Location: Goolwa, South Australia

PostPosted: Wed Aug 31, 2011 7:18 pm
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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 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
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platinum
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Joined: 31 May 2011
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Location: Bangkok Thailand

PostPosted: Thu Sep 01, 2011 6:45 am
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Pappy K wrote:
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 Exclamation


Please see Nick's link above. Very Happy
Then scroll down to the "Explosion Diagram for Lama 3 (click to enlarge)".
What an interesting heli!
Have fun flying.

platinum
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Pappy K
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Location: Goolwa, South Australia

PostPosted: Thu Sep 01, 2011 9:01 pm
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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
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Skyepuncher
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Joined: 29 Aug 2011
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Location: south-central Ohio

PostPosted: Thu Sep 01, 2011 9:20 pm
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tombo242 wrote:
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.

Look on Nick`s link, 2 pics below the vids. It say the rudder is controlled
by varying the collective on one set of rotors. Very odd setup. It seems
that in order to initiate rudder input, You would also change the amount
of lift, one way or the other. Confused
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nick_onelove
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Joined: 01 May 2011
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Location: Mendocino County, CA, United States 21 years old

PostPosted: Thu Sep 01, 2011 9:28 pm
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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?
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tombo242
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Joined: 04 Nov 2008
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Location: Santo Estêvão, East Algarve, Portugal. Now 82, but still feels 22.

PostPosted: Fri Sep 02, 2011 9:52 am
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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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brett567
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Joined: 23 Oct 2012
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PostPosted: Tue Oct 23, 2012 6:05 pm
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Wow, that thing looks pretty nice.The tail rotor is still just for looks though, it will probably spin from the downdraft of the main rotor.Interesting co-axial collective pitch also the drive system using single brushless motor to drive two rotors turning opposite direction by main gear,Look rather more complicate than the basic coaxial.
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