Freebird Ornithopter
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- Опубліковано 1 жов 2024
- Freebird is the original and best DIY ornithopter design. An ornithopter is a device that flies by flapping wings. I wanted to show what awesome flights this particular ornithopter is capable of when correctly built. This ornithopter is powered by rubber band. Free plans at www.ornithopter.org.
I believe that situation would be addressed in the instructions. In case it is not, however, some problems like this are surprisingly easy to correct if you take the time to learn what adjustment to make. As with other flying models you can correct a stall by slightly decreasing the angle of the tail. With this ornithopter a stall can also be corrected by making the connecting rods a little longer.
simplebloke, the spiral dive can be caused by not balancing the wings properly. add a little weight to the wing on the outside of the turn, and adjust the amount of weight so it makes *broad* turns. it could also be your connecting rods are too short. the wings need to have a "dihedral effect" to keep it from going into too tight a turn.
monkeyrahha, you can find plans at The Ornithopter Zone. go to that site and click on the "articles and plans" link.
Nothing is modified. It has about 220 turns on two loops of 1/8" rubber. You need to use lubricant or it will break before you get that many turns. Individual models may vary in performance for many reasons including differing wood density or slight variation in the dimensions of the crank. There have been several versions of the Freebird design and this is the one that has a staggered crank for more symmetrical flapping.
Wings flapping slowly would indicate one of the following: glue in the mechanism, tissue interfering with wings or too tight, not enough rubber, bearing tube not smooth on the end, or model not assembled according to instructions. I would suggest building one of the kits instead. It will eliminate many factors that might be challenging for a first time builder. Try birdkit.com.
It is four strands of 1/8 inch rubber. I don't understand the difference between crank of 220 turns or straight up.
That is certainly because the wings are not flapping fast enough.
Congratulations, an amazing achievement. I have had a go at couple of these and all I can manage is some short periods of level flight followed by an increasingly tight downward spiral dive. I will try to find the modified crank design and see how I go. By the way have you seen the biplane ffreebird design?
is this the modified balsa freebird? what rubber did you use? how many winds? did you modify anything?
Thats awesome, so what mass of rubber did you use and is it a crank of 220 turns or just straight up 220 turns
Crikey, awesome!