The Flying Scrooge: Ornithopter of Household Items




Posted in OutsideKites

Introduction: The Flying Scrooge: Ornithopter of Household Items

About: Every now and then I come up with a unique idea. And then I find someone else has already thought of it . . . which is AWESOME! Who knew there were so many kindred spirits on the web! YOU GO all o' us!

This instructable will show you how to make a nifty flying model known as an ornithopter from cheap to free stuff.

An ornithopter is a lot like a model airplane, but it flaps its wings like a bird or an insect, and is a lovely sight to watch in flight.

This is pretty easy to build; you really only have to make sure the bearings are all parallel. Everything else can be crooked and this will STILL fly just fine. It is also VERY sturdy and can take many, many crashes without breaking. As an added bonus (and due to my personal tightwaddery) it is CHEAP. You can make this ornithopter out of household items. Mine cost about $1.30 to make.

If you appreciate this instructible, please visit my blog for more ideas:

Bamboo Place Mat -- $1 at the local dollar store. We bought one too many for our table.
Gel Super Glue -- $1 for a 3 pack at the dollar store. Found it in a cupboard.
Plastic Grocery Bag -- Usually use them for tying up stinky diapers.
Coffee Filters -- Free from work (I don't drink coffee). And, no, I didn't steal them.
Paper Clips
Rubber Bands
Bic Pen
White School Glue
Clear Tape -- All free stuff I found lying around

CA accelerator -- $4 at the local hobby store. Sets super glue almost instantly.

Sharp Blade
Diagonal Cutters
Needlenosed pliers
Regular Pliers

Step 1: Assemble the Body

I looked up "ornithopter plans" on Google and can up with these plans. However, I wanted to make an ornithopter with four wings, like this. So I decided to base my ornithopter on the free bird plans, but modified it to make it four-winged and for use with my bamboo construction materials.

Start by removing some flat bamboo strips from the place mat and laying out the body shapes. I made some triangles. Using a pencil, carefully mark lines where they overlap. Cut along the lines with your dikes. Carefully clean up the edges with a knife. Glue together with a bit of superglue and spray with accelerator.

Continue for all the joints.

Step 2: Assemble Crank Supports

The top and bottom of the body need to be parallel, so add a few pieces to make the bottom rectangular.

I made some thin support pieces by cutting the bamboo in half lengthwise.

Step 3: Add Bearings

Make three bearings by wrapping a large paperclip around another large paperclip. Straighten the paperclips out before you begin. Coil the wire onto a small screwdriver or a dirll bit that is slightly (slightly!) larger than the diameter of the paperclip wire. This slight diameter change allows the paperclip to rotate freely inside the coil. Clip off excess wire. Based on user feedback, it seems this step is harder than it appears. When you are done making your bearings, test them for smoothness of turning.

When you have three bearings, make some bearing support pieces as pictured. Glue a bearing to the bottom of the body. This is the main crank bearing. Glue two bearings to the top, side by side in the channels created by the support pieces. These are the wing bearings.

I found it helpful to slip a couple straight pieces of paperclip inside the bearings as I was positioning them. This helped me ensure they were all parrallel.

Step 4: Reinforce Your Joints

Mix white glue half and half with water in a disposable cup. Cut out some rectangles of coffee filter tissue and glue onto the body, making sure that the tissue is throughly moistened with glue. Apply two layers. Let dry.

Step 5: Finish the Body

Finish the body using the photo as guidance. Add another triangle shape at the rear. The two rear spars are half-thickness to allow the tail hook to fit between. Form the tail hook from a large paperclip. Scuff the tail hook and superglue to the rear triangle. Reinforce tail hook with tissue paper.

After flying and crashing my ornithopter for several days, it broke right at the weak point between the triangles. So I added a third spar high enough to avoid the rubber band motion. I recommend you add one as well, as pictured.

Step 6: Make Wing Spars

The wing spars need to be longer than any one piece of bamboo. Join two straight bamboo pieces together by cutting as shown and gluing. The stepped cut gives more surface area for the glue to grab, strengthening the joint. Reinforce the joint with tissue. Drill a small hole through the joint.

You can make a drill by squishing the end of a paper clip and cutting it at an angle with dikes. Bend into a stepped shape and hand crank away. I made a motorized drill for this project from a VCR motor I had lying around and a thumbtack. Super glue the tack to the motor, squish the tip with pliers, and cut at an angle. Attach to 9-volt battery. I found the VCR lying beside the road a few years ago and scavenged it for parts before I threw the case away.

Form two wing cranks from paperclips as pictured. The little "jog" in the left wing crank allows good wing movement. Insert cranks into wing spars and superglue in place. Reinforce with a layer of tissue. Take two smaller pieces of bamboo and drill several holes at regular intervals. These will be the adjustable arms.

Insert the left and then right wing spar and slide the adjustable arms onto the wing and main cranks. Test wing movement. You might have to add a piece of Bic ink tube as a spacer to one of the wing cranks for easy movement.

Disassemble wings and adjustable arms.

Step 7: Make a Crank

Straighten a paper clip and bend a hook on one end. Insert into the bottom bearing and bend a stepped shape (the crank handle) into it.

Make a bead for the crank from a Bic Pen. Pull a Bic pen apart with pliers. Cut off a few rings of the ink tube. Fill the rings with super glue and let dry. Slide one onto the crank handle and glue in place with super glue. Be sure not to get any glue on bearing.

Step 8: Make the Tail

Save the outlines.jpg file attached to this step. Print it full size. {In Windows XP, right click on the file name and click "print". A dialog box will open. Keep clicking "Next" until it prints.} Cut out the tail section from the paper and trace onto the grocery bag. I taped my grocery bag to the back of a clipboard to have a smooth surface.

Using similar techniques as before, cut and glue two bamboo pieces together at an angle for the tail booms. I also thinned my tail booms to cut down on weight. Glue a large, straightened piece of paperclip as a tail boom. Cut a small circle out of tissue and reinforce the joint with it. Carefully cut the tail out of the grocery bag with a sharp knife. The tail should be about 6.5 inches long. Super glue the tail to the tail spars.

Step 9: Attach the Wings.

Cut out the wing outline from the paper you printed in the last step. Trace onto the grocery bag. Flip, and trace the other half of the wing. Trace a second wing the same way. Carefully cut out both wings. Cut a rectangle out at the middle of the straight edge of each wing piece. This allows the mechanics to move freely. Super glue the wings to the wing spars, starting at the center. Cut the right wing down the middle.

Insert the left wing into the left wing bearing. Insert the right wing and make sure that the wings can move freely. You might have to add a bit of ink tube as a spacer. When you have them moving well, remove the right wing. Glue the left wing to the the "spine" of the body. Add the right wing and just tape the centerline of the wing flaps to the left wing.

Step 10: Final Assembly

Scuff up the tail boom with dikes and superglue to the body. Reinforce with filter paper. Using pliers, bend the tail boom up about ten degrees.

Hook a rubber band onto both hooks.

Step 11: Test Fly and Trim

Wind up your ornithopter and test fly it. Wind it clockwise and counterclockwise to see which direction gives you smoother movement.

Here's my second test flight:

If your ornithopter zooms upwards and stalls, try adjusting the tail boom down a bit. If it still stalls, you may need to tape a coin to the front of your 'thopter.

If it turns in a slow circle, you can tape a piece of wire to the wing tip on the outside of the turn. I left my wing spars long, and so I just cut off excess from the wing tips on the inside of the turn to fix that.

Experiment with different arm lengths (you know, the adjustable arm) and different rubber bands. I found that two or three narrow rubber bands gave me more consistent torque than one thick band (and also lasted longer).

Now go play with it! My daughters love watching this thing.


I've added a couple pictures to show where to attach the rubber band (actually, I use four regular rubber bands at once) and where you wind it up.

Step 12: Bearing Pictures

As per forum request, here are a few close-up pictures showing the wing and crank bearings in their final form.



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I'm almost finished

does round dowels work?

Dear Royalestel,

Congrats on your "ornithopter from household materials". To build one of these with such limited materials is a real accomplishment. I wanted to add a comment on your instructable, but it wasn't working, so I decided to send you a message.

Since a lot of people were looking for other plans and stuff, you might want to provide a link to where there is a whole section of free plans for various designs.

(The "competition" link and also the "articles and plans" page both have several plans.)

Also, you should delete the comments from that "chirothopter" guy. Historically, the word "ornithopter" refers to any flapping-wing flying device, not just ones that have "feathers". He's only going to confuse people by trying to divide these machines into different categories. Besides, he didn't even construct the term properly: It should be "chiropter" without the "th".

Nathan Chronister
The Ornithopter Zone

PM'd to me and reposted here for everyone's benefit. The link is especially handy!

3 replies

i have been meaning to reply to you for some time now so sorry for the late comment. I will agree with you that ornithopter is a very generalized term that is used to describe a flapping fying machine. however, if you disect the word you will end up with orni(bird) and thopter(flapping machine) and when the word chiroptera(bat) is disected you find chiro(hand) and ptera(wing) and when put together you end up with chirothopter and not chiropter as the word opter has no meaning without a prefix or suffix. so, if the roots are taken literally enough you end up with the three main groups of flapping machines: entomopter,chirothopter, and ornithopter and that's if you do not consider helicopters as flapping. i will also agree with you that this will confuse people and i am sorry for that. but, for those of us it does not confuse, this is very interesting peice of information and thats all im trying to make it into. i am not suggesting we change every book and website using ornithopter to the more specific term.

OK, I guess it may be kind of pointless to reply to this eight years after the fact, and you may never see this reply, but I just saw this post and wanted to say, for what it's worth, that in fact royalestel is correct; it would be chiropter, not chirothopter. Your dissection of "ornithopter" is mistaken; the Greek prefix for bird is ornitho-, not orni- (hence why the study of birds is called ornithology, not ornology or orniology), and the second root in ornithopter is simply the same -pteros (wing) as in chiroptera. So it's not orni + thopter (neither of those are actual Greek roots); it's ornitho + pter, and simply means "bird wing". (You don't have to take my word for it; you can look up "ornithopter" in any dictionary that gives etymologies and it will verify this.) So yes, as royalestel said, an analogous word formed from chiroptera would be simply chiropter, not chirothopter; there's really no reason for that "th" to be there.

(Or rather I should say Nathan Chronister is correct; missed that royalestel was quoting a PM.)

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in the last airbender Aang, he had one

anyone u can send the list of requirements

Great plans. will the bamboo sticks work on a 2-winged ornithopter, it being heavier when compared to balsa??

what r the inches cinimeter to all this bamboo i dont no how much to cut and with the paper clips what do u mean put one at the bottom of the body

hey can we use a spring?????????

rather than coiling maybe you can use a balloon stick,maybe?pls reply..

2 replies

great idea ive made 3 ornithopters and im sure thet would work

What's a balloon stick? You mean, like a straw?

instead of making the complicated paper clip bearing you can make a paper tube and super glue it and its practically like plastic

can you send me the plans at thx (=

He said that the plans are from the free bird plans