Animatronic membraned wings

J robert b Core jr

Greetings, i have a question that i don't know how to fit in other form
What is the servomotor is most used on?

On animatronic is common use of servo motors, i am curious of the most used because i am looking for purchase a quality servo for a project, that involves large membrane wings movement(just fold and unfold)

The project involves a pair of servos(under quenstion here)and what would be the best materials to deal with?
some already at home when mentioned
protoboard(already acquired), arduino mega(already acquired), about 3 metres of spandex style red fabric(named as ''hitwist'' at store(not sure if it is the best), will add veins details with airbrush(already acquired) later), and i would like to hear suggestions of the best materials for wing be spread, tho i have some circuit in mind already drawn for use on arduino and virtuallly tested

OBS:since it is my first day here, i am not exactly aware of all rules, did made some search and found no closeby refference of my subject

Chris Ellerby

There is not really any standard servo for animatronics.  The servo you pick is based on the needs of your project:  speed, power, degrees of rotation, size, power requirements, and cost.   And more advanced projects can call for more expensive digital and dynamixel servos.

For wings I would go with the lightest material possible if you want to animate them.  How big do you want these wings to be?  Do they need feathers, or are they more like bat or dragon wings?

Spandex is a good material.  Just make sure you orient it the right way, as spandex stretches more in one direction.

/Chris

Chris Ellerby

Are these wings for a small character, or human sized?

If you are looking at human sized wings, you might not be able to find strong enough servos unless you are looking to spend a few hundred dollars per servo. 

Think of wings like a leaver.  The closer to the fulcrum (pivot point) you are, the more strength is required to move the weight at the other end of the lever.  Because wings are actuated from the center, you are moving a load that is somewhat heavy and far out from the fulcrum, meaning it will take a lot of strength to move the load.

Depending on the type of motion you want, and how/where you plan to use the wings, you may want to consider pneumatics or human-powered cable control.

/Chris

J robert b Core jr

"Chris Ellerby"  thanks for the quick answer
I do not need for high speed on servos, just a 75 degrees turn(all avaliable here are 90 degrees), and i guess the hitwist fabric will not weight more than about 4 kilos(about 3 meteres long each wing, will be a dragon) all fabrics on wings are about that weight, i was thinking on order aluminum to make all movements needed, bamboo is also an option, but harder to find

Sorry to mention that pure ''spandex'' is not an option, it tends to be to rare and expensive to be found for my intentions, and thanks for clear somethings

David Boccabella

Again the big question is How Large are you wings.

I have seen a few designs on the net that are large enough to be worn and use linear motors  to extend the wings.
This fellow is a genius with them and has full designs and patterns

Here are some links.. 
http://bushitaka.deviantart.com/
http://forum.hsbne.org/t/animatronic-wings/1358

Enjoy. I have made some test cases for Cos-Players however the cost of the motors etc not one has takes it further. Works out to be about $280AU for the linear motors.  These are available on Ebay both with feedbank and nonfeedback varieties.

Dave

David Boccabella

Also just found this updated design. It gets rid of the linear motor issues.
http://bushitaka.deviantart.com/art/WIP-wing-design-288910301

I'd recomment wiper or electric window motors for this

Dave

J robert b Core jr

As i said will be a pair of membraned wings, about 3 meters spanwing, and again thanks for all refferences, now i need to recalculate weight on the servos, in needed purchase stronger ones