Ornithopter(s)

[bmcj]

Has anyone posted this yet?

 

[REVAN]

Although I'm a big fan of ornithopters and like to see progress being made in this field, this machine falls in the ridiculous category. Helicopters look elegant, by comparison.

I hope the work they have done on the many many iterations needed to get it flying goes somewhere better than my imagination envisions for this architecture.

 

[Daleandee]

"I'll take, Things That Look Too Goofy For Me To Fly for 200 Alex!"

 

[Aesquire]

Magnus effect RC plane using KFC buckets for wings.

Far more elegant?

 

[Aesquire]

I'll give the OP ornithoptor guys credit for not making bird looking wings and using basic rectangular ones.

Far too many have copied the appearance of bird's wings but not the functionality trying to fly. The Wright Flyer didn't have tip feathers unlike several failed previous designs. Seeing beyond the pretty to the function is a talent.

 

[bmcj]

Magnus effect RC plane using KFC buckets for wings.

Far more elegant?

Chicken wings

 

[henryk]

ornithoptor guys credit for not making bird looking wings and using basic rectangular ones.

=this young engeneers from prof.Kiselov scuul are continued work
in "one way street"...

-but it exist experimental works with flapping (OSCILLATING) surfaces
(fan,wing) of dr Sorokodum =1900 N/ HP specific thrust !!!,
simplest construction, very complicated nonsteady aerodynamic=

"Vortex Oscillation Technology Ltd" - Content

"Vortex Oscillation Technology Ltd" - Content

=> 1:30 ...thruster measuraments.

 

[henryk]

Why It's So Hard to Build a Wing-Flapping Flying Machine

The DIY ornithopter video by Jarno Smeets that spread across the Web this week looks like a fake. Heres why the ancient dream of winged human flight is so difficultbut why someone, someday, really could achieve what Smeets claimed to do.

www.popularmechanics.com

=some joyke history...

 

[Aesquire]

One new sport is pumping a hydrofoil board. By shifting your weight fore & aft while pumping, almost jumping, you skim along above the water until you tire out. You are gliding the underwater wing up & down to generate forward thrust, and coasting to glide along...

My Father taught me to pump drive a canoe. Standing near the CG, but not on it, you porpoise up & down and the asymmetry drives the canoe forward at speed. ( or backwards if you want )

it's really the water equivalent of a stick-slip phenomenon used by windup toys.

I tried pump climbing Rogallo wing hang gliders back when we all had to walk fast to keep our feet from burning because the Earth hadn't cooled off yet. I never accomplished anything better than momentary zoom climbs and a flight path that averaged worse than a straight glide, bleeding energy away, but it wasn't a wing designed to articulate to provide asymmetric thrust so it doesn't disprove ornithoptor flight, even if I ignore the Pterandons that were a safety issue back then.

 

[henryk]

I tried pump climbing Rogallo wing hang gliders

in 1977 dr Jerzy Wolf was experimentally realised His methode
of Oscillating Wing Propulsion=horisontal fly...

samolotypolskie.pl - Wolf Jerzy

AIAA Aerospace Research Central

NASA Conference Publication

books.google.pl

p=529...

 

[Aesquire]

Thanks, some good stuff there, Some I have scattered through decades of magazine articles.

 

[BJC]

Although I'm a big fan of ornithopters and like to see progress being made in this field, this machine falls in the ridiculous category.

BJC

 

[AdrianS]

BJC

What's fascinating about that video is how still the body is as the wings flap.
Clearly the up and down strokes are timed to balance out up and down lift.
Note also that the two sets of wings are not exactly opposite phase.

 

[REVAN]

I'll give the OP ornithoptor guys credit for not making bird looking wings and using basic rectangular ones.

Far too many have copied the appearance of bird's wings but not the functionality trying to fly. The Wright Flyer didn't have tip feathers unlike several failed previous designs. Seeing beyond the pretty to the function is a talent.

I removed credit for that. The wings are made like model airplane wings, instead of ornithopter wings. It has independent parts pivoting on a rigid spar for twist rather than flexing for twist. This basically eliminates the span-wise wing bending modes of the wing. That leaves a lot of potential ornithopter efficiency out of reach for this design. That may be why it needs 8 wings to fly instead of 2, or even 4 like the dragonfly.

That rigid spar is a big problem. Only very small ornithopters flap a mostly rigid wing. Larger wings need multiple bending modes. The flap is not rigid, but a wave. It is better both structurally and aerodynamically.

Another advantage of ornithopters resides in incorporating the flight control into the flapping motion. It appears that the flapping of this ornithopter only provides propulsion. A useful system would also provide control and wing folding in one system architecture.

I applauded the 'stick-to-it' attitude of these guys. It takes a monumental amount of work to get something like this flying. However, I can't help but thinking that there are some basic principles of flapping wings that, if they had known, would have taken them down a very different design path.

 

[henryk]

basic principles of flapping wings that, if they had known, would have taken them down a very different design path.

flapping wing generate some vortices with huge energy...

-it exist fenomenon=vorticis can suck energy from calm air,
as warm pump do.

Stunning video shows how owls fly by creating swirling vortices of air

A new study from the Royal Veterinary College outside London has captured the mechanics of how birds fly, by creating small vortices or rotating air with their wing flaps and tail movements.

www.dailymail.co.uk

 

[mcrae0104]

Has anyone posted this yet?

My Russian is not too good, so I have no idea what he said.

But I do recall my old friend Maude Frickert recounting the story of her brother Maynard, who had scotch taped 146 pigeons to his arms... he was airborne for a good twenty seconds, she said, until somebody threw a bag of popcorn in the stone quarry.

 

[bmcj]

My Russian is not too good, so I have no idea what he said.

But I do recall my old friend Maude Frickert recounting the story of her brother Maynard, who had scotch taped 146 pigeons to his arms... he was airborne for a good twenty seconds, she said, until somebody threw a bag of popcorn in the stone quarry.

I can just imagine Jonathan Winters telling that story.

 

[henryk]

My Russian is not too good

-и мой английский !

biography

=first ORNITHOPTER-lizenz pilot,Ms.Patricja from Canada...