PDA

View Full Version : Old technology but new to me



MiddleAgesMan
08-24-2009, 10:40 AM
On the Instructables website I came across something called the walkalong glider, a toy airplane that can be made easily and then "flown" for indefinite periods under the right conditions:

http://www.youtube.com/watch?v=pI8u8fQmtIo&eurl=http://www.instructables.com/id/Walkalong-Glider-Made-from-Phone-Book-Paper/&feature=player_embedded#t=170


Paul MacCready's sons developed such a toy on their own when they grew tired of working on Dad's human powered craft. Here is Kevin MacCready demonstrating the highly evolved toy he and his brother's invented 20 or 25 years ago:

http://www.youtube.com/watch?v=S6JKwzK37_8&feature=related

TimH
08-24-2009, 11:08 AM
Hang gliding is on my long list.

Jim Bow
08-24-2009, 01:08 PM
How do they do that? Are the batteries in the cardboard? Where's the input?

I knew that Wii controller technology would evolve. Cool stuff. Who owns the intellectual property documents?

MiddleAgesMan
08-24-2009, 01:18 PM
Here's another one similar to the MacCready boys' being flown down a sidewalk with near perfect control:

http://www.youtube.com/watch?v=qBLERGHEz4Q

You can see the top of the cardboard "paddle" at some points. You'll notice it isn't being used as a fan, just as a glide slope to create a slight updraft.

Here's a very small one being flown indoors with hands instead of a large piece of cardboard:

http://www.youtube.com/watch?v=LGZN1-diDjU&feature=related

George Roberts
08-24-2009, 02:08 PM
The physics are simple. You walk behind the glider with a deflector (hands or cardboard). The deflector pushes the air up toward the glider. The air keeps the glider up. More or less you carry the glider down the road. Not very impressive.

Milo Christensen
08-24-2009, 04:09 PM
That was very neat. New to me as well. But this is what's on my "want" list. (http://www.google.com/search?sourceid=navclient&aq=0h&oq=alula&ie=UTF-8&rlz=1T4HPIA_enUS314US314&q=alula+glider)

Rational Root
08-24-2009, 04:20 PM
The physics are simple. You walk behind the glider with a deflector (hands or cardboard). The deflector pushes the air up toward the glider. The air keeps the glider up. More or less you carry the glider down the road. Not very impressive.

A wheel is simple. Does that make it any less impressive.

S/V Laura Ellen
08-24-2009, 04:45 PM
The physics are simple. You walk behind the glider with a deflector (hands or cardboard). The deflector pushes the air up toward the glider. The air keeps the glider up. More or less you carry the glider down the road.

Duh.... No kidding?
You figured that out for yourself?

When working with such small forces the balance and lift/weight ratio must be very critical.

George Roberts
08-24-2009, 04:46 PM
A wheel is simple. Does that make it any less impressive.

If a kid shows up at a science fair, few would be impressed.

MiddleAgesMan
08-24-2009, 07:15 PM
The physics are simple. You walk behind the glider with a deflector (hands or cardboard). The deflector pushes the air up toward the glider. The air keeps the glider up. More or less you carry the glider down the road. Not very impressive.

Yep, simple physics but difficult to produce. Give it a try and post a video, Mr. Grrrrrr. ;)

MiddleAgesMan
08-24-2009, 07:37 PM
That was very neat. New to me as well. But this is what's on my "want" list. (http://www.google.com/search?sourceid=navclient&aq=0h&oq=alula&ie=UTF-8&rlz=1T4HPIA_enUS314US314&q=alula+glider)

Following links from the walkalongs led to those RC "slope gliders," Milo.

http://www.youtube.com/watch?v=46NjEopIJIo&feature=related

Pretty incredible to my simple mind. Maybe Grrrr could explain the physics of how these hills appear to be stationary but must be driven along behind these gliders by unseen hands (of God?) to help them stay up while they do barrel rolls and upside down flight. ;)

Uncle Duke
08-24-2009, 07:45 PM
On the Instructables website I came across something called the walkalong glider, a toy airplane that can be made easily and then "flown" for indefinite periods under the right conditions:Very neat.
Anyone into "Instructables" (which is very excellent!!!) might also want to check out "Make" - magazine and website: website is here:
http://makezine.com/

skuthorp
08-24-2009, 09:55 PM
Have a look at their Greenland kayak site too"
http://www.instructables.com/tag/?q=greenland+kayak&limit%3Atype%3Aid=on&type%3Aid=on&type%3Auser=on&type%3Acomment=on&type%3Agroup=on&type%3AforumTopic=on&type%3AforumTopic=on&sort=none