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Old Jan 03, 2010, 05:18 PM
What goes up, must be repaired
Mid-Michigan
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Has anyone started designing a SA-2 Samson from the movie Avatar?

I was curious if anyone has started working on designing a model of the Aerospatiale SA-2 Samson VTOL as seen in the new movie Avatar?
Do you think it would be easy to do? The rotating rotor clusters would need to be controlled by the Elevon mixing function in a computer radio. Any ideas on motors, rotors, etc? Anyone?

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Old Jan 04, 2010, 10:37 PM
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here are cool ones I have found on youtube.
VTOL RC model Ultraman Matjyro ラジコン マットジャイロ (2 min 14 sec)
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Old Jan 05, 2010, 04:24 PM
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Hello Gema,
I saw that video recently as well. I was unable to find any more info on it though. I had the same thought after watching Avatar, what a neat project that would be huh?
-Mike
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Old Jan 07, 2010, 07:15 AM
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United Kingdom, England, Nottingham
Joined Oct 2009
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I too have been thinking of doing this. I haven't started any real design work but I've been thinking about the control aspects. So far I think I would go for two sets of mixed controls, pitch and yaw controlled by servo's linked to the rotating ducted rotors and two seperate escs mixed to control collective and roll. The wiki entry states that roll is achieved by increasing power to one rotor. Sounds logical. No need for a gyro as far as I can see. The aircraft in that vid, though a bi wobbly, is very well done. I think that the instability lies in the fact that the ducts are horizontal (like this -_-,) if you look at the SA-2 and the Scorpion you can see that the duts tilt out a little (like this \-/.) That would help stablise the aircraft and at least prevent it wobbling from side to side so much. Wobbling on the pitch axis might be a problem, but that could be solved by moving the CG slightly forward and then compensating with trim. This would also mean that the fus would always be pitched down slightly in a scale way. I think you wouldn't neccesarily need a computer radio, I have two GWS V-tail mixer units that I will try to use.

I really, really want to give this a go and I think we should keep this thread going !!!
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Old Jan 07, 2010, 04:04 PM
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beavercreek,ohio
Joined Jan 2007
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Quote:
Originally Posted by WLJayne View Post
I too have been thinking of doing this. I haven't started any real design work but I've been thinking about the control aspects. So far I think I would go for two sets of mixed controls, pitch and yaw controlled by servo's linked to the rotating ducted rotors and two seperate escs mixed to control collective and roll. The wiki entry states that roll is achieved by increasing power to one rotor. Sounds logical. No need for a gyro as far as I can see. The aircraft in that vid, though a bi wobbly, is very well done. I think that the instability lies in the fact that the ducts are horizontal (like this -_-,) if you look at the SA-2 and the Scorpion you can see that the duts tilt out a little (like this \-/.) That would help stablise the aircraft and at least prevent it wobbling from side to side so much. Wobbling on the pitch axis might be a problem, but that could be solved by moving the CG slightly forward and then compensating with trim. This would also mean that the fus would always be pitched down slightly in a scale way. I think you wouldn't neccesarily need a computer radio, I have two GWS V-tail mixer units that I will try to use.

I really, really want to give this a go and I think we should keep this thread going !!!

your going to need gyros, ESPECIALLY on the roll Axis built (buliding) VTOL, which has almost the same lay out. Testing/flying proved impossible without gyros. You should have a gyro on roll and the pitch axis, yaw and throttle you probibly can handle without gyros.
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Old Jan 08, 2010, 09:54 AM
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This would be a nice platform to start from:
New World's First RTF Transverse Array 4 CH Art-Tech 2.4GHz K-22 Transverse Array Dual Rotor Radio Remote Control Electric RC Helicopter RTF w/ Patent
On Sale: $69.90
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Old Jan 08, 2010, 10:07 AM
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Joined Nov 2008
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Quote:
Originally Posted by WLJayne View Post
I too have been thinking of doing this. I haven't started any real design work but I've been thinking about the control aspects. So far I think I would go for two sets of mixed controls, pitch and yaw controlled by servo's linked to the rotating ducted rotors and two seperate escs mixed to control collective and roll. The wiki entry states that roll is achieved by increasing power to one rotor. Sounds logical. No need for a gyro as far as I can see. The aircraft in that vid, though a bi wobbly, is very well done. I think that the instability lies in the fact that the ducts are horizontal (like this -_-,) if you look at the SA-2 and the Scorpion you can see that the duts tilt out a little (like this \-/.) That would help stablise the aircraft and at least prevent it wobbling from side to side so much. Wobbling on the pitch axis might be a problem, but that could be solved by moving the CG slightly forward and then compensating with trim. This would also mean that the fus would always be pitched down slightly in a scale way. I think you wouldn't neccesarily need a computer radio, I have two GWS V-tail mixer units that I will try to use.

I really, really want to give this a go and I think we should keep this thread going !!!
I wish you success. Subscribed.

Similar thread over at Multirotor Helis.
http://www.rcgroups.com/forums/showt...8#post14006458
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Old Jan 08, 2010, 04:31 PM
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I'm totally subscribed too ^_^

I was pondering this all day before I hit rcgroups to see if anyone else was thinking the same thing!

I'm really surprised we aren't seeing these full-size yet! It seems to me that the mechanics and physics of them are far simpler than conventional helis. No cyclic blade control to worry about, although I'd use collective on each fan unit on the full-size... So... very... cool... And yes, I'd have the CG father forward than on that Ultraman thing

Cheers!

Kitty
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Old Jan 08, 2010, 05:43 PM
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Originally Posted by blindflight View Post
www.bananahobby.com
This would be a nice platform to start from:
New World's First RTF Transverse Array 4 CH Art-Tech 2.4GHz K-22 Transverse Array Dual Rotor Radio Remote Control Electric RC Helicopter RTF w/ Patent
On Sale: $69.90
Thanks for that post. I checked that little aircraft out, and it's pretty cool! I agree it would be a great platform to start with as well. I would take the radio gear and electronic equipment from it to use with a larger platform, and higher power motors. I have just ordered on for the fun of it, how can you go wrong at that price?

Regards,
-Mike
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Old Jan 09, 2010, 08:18 PM
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Originally Posted by LedKitty View Post
I'm totally subscribed too ^_^

I was pondering this all day before I hit rcgroups to see if anyone else was thinking the same thing!

I'm really surprised we aren't seeing these full-size yet! It seems to me that the mechanics and physics of them are far simpler than conventional helis. No cyclic blade control to worry about, although I'd use collective on each fan unit on the full-size... So... very... cool... And yes, I'd have the CG father forward than on that Ultraman thing

Cheers!

Kitty
The reason we don't see things like this is because the first capable aircraft like this only recently became reliable. It is the V22.
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Old Jan 09, 2010, 08:42 PM
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5 hours later, I came up with this. I just saw the movie yesterday (it was awesome) and you guys tempted me with the challenge to make one of these. Got a gyro on roll and pitch, testing is going fairly well, I can let go of it for a few seconds before the roll axis becomes tooo unstable.
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Old Jan 09, 2010, 10:11 PM
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Originally Posted by foam and tape View Post
5 hours later, I came up with this. I just saw the movie yesterday (it was awesome) and you guys tempted me with the challenge to make one of these. Got a gyro on roll and pitch, testing is going fairly well, I can let go of it for a few seconds before the roll axis becomes tooo unstable.
Looking good. Playing with the gyro gain doesn't calm down the roll problem?

I've never played with foam before. Where do you get yours from?
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Old Jan 10, 2010, 02:38 AM
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Quote:
Originally Posted by foam and tape View Post
5 hours later, I came up with this. I just saw the movie yesterday (it was awesome) and you guys tempted me with the challenge to make one of these. Got a gyro on roll and pitch, testing is going fairly well, I can let go of it for a few seconds before the roll axis becomes tooo unstable.
That looks great man! 5 hours huh? takes me that long to clean my workbench off enough to start a project. I'd love to see more info on your project, pics/video whatever. You've inspired me.
-Mike
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Old Jan 10, 2010, 05:05 AM
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Thats very cool F&T, can you give us a vid of it flying ?
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Old Jan 10, 2010, 06:29 AM
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Thanks guys. I'm going to try to get some vid and do some testing at my local indoor today. Might just be a vid of crashes.
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