First one is gas powered and no controls at all.
Second one has remote throttle.
Third one has a funny but real control.
Next one has seemingly good control and can do about 15 mins on 450 mAh battery
Last one was CAD designed and 3D printed.
There is s small sort of tail wing that keeps the main wing at the right angle. This also works after the power goes out, so the device lands with a sort of maple leaf seed autogyro.
Probably the wing will be a number of 3D printed pieces connected together making a frame. Since it is rotating the shape of the 3D pieces should make a twist like a propeller. This way the inside helps thrust even though it is moving slower. Then over this frame we can put a Monokote shrink wrap skin (or Ultrakote) which works well for model airplanes. It seems Monokote does stick to plastic. Someone has 3D printed the frame of a wing and then covered it with Monokote like I plan to do. There is also a flying wing with 3D printed frame and Ultrakote cover. And another plane with 3D printed frame.
One guy imported NACA airfoil dat files to FreeCAD and then lofted them. He made a python macro for FreeCAD. We can get the NACA files for a propeller and loft those.
There is also airfoiltools.com which has lots of tools for getting sections of wings and such.
The phone/watch will talk over bluetooth to the motor controller. The phone has a compass, GPS, camera, rotation sensors, acceleration sensors, etc. If the phone wants to tilt the plane of rotation it can make the wing go faster on the side it wants to go up. We are probably doing on the order of 5 rotations per second, which is plenty of time for a computer to do things. To go higher it makes the average power on the rotation higher.
If we are 0.55 lbs or less we don't need a license in USA. So 250 grams (8.8 ounces) or less we don't need FAA license. My Samsung duos is about half that. Phantom 3 max takeoff is 1.3 Kg. Flight battery alone is more than this. DGI Mavic is 1.6 lbs.
There are waterproof Android Wear watches that are under 60 grams. Like Sony SmartWatch 3 for under $100 with bluetooth, GPS, compass, gyro. It is 2 years old and Sony SmartWatch 4 should be out any time. So probably a smartwatch is the way to go. Not sure if they have cameras yet. Some smartwatches are less than $40.
There are several drones that are less than 250 grams so one idea it to take parts from one of these. Some of these, like the parrot, can be controlled from a smarphone. The mini drones seem to have flight times more like 10 minutes. The Heli-max 230si can do 15 minutes. One place says Heli-max is only 127-132 grams. It has ability to carry camera and still be under 250 grams I think. So it seems it could carry lots of battery and stay up longer. Hum.
So we may be able to use Android watch to talk to minidrone but really only using 1 of the propellers to run our monocopter. So should fly longer. Danger is that minidrone controller knows which way is up and is trying to turn propeller off and on all the time.
Looks like a 3 foot long and 3 inch wide by 1/4 inch thick piece of balsa weighs 1.5 to 4 ounces. It seems plausible we can make a wing for around that weight.
It seems App-Inventor also works for Android Watches
We can take picture at near the same spot in the rotation 5 times a second or whatever and then use anti-shake algorithm on video.
Seems like there is a good chance of getting like 1 hour hover time if quad can get 15 minutes.
Going into the wind with a mono-copter means more lift as wing goes into the wind and less as it moves away. This could be big trouble as we may not be able to adjust the speed enough to compensate. Hum. Problem to think about here. Big trouble. Really needs to twist every rotation like a helicopter blade. Some chance we can get some twist by having propeller above or below. Might have a rotation between payload/batteries and wing with spring. Fear we need a servo controlling tail section. Also seems much more stress than had been thinking. Would be find inside a big building but out in the real world this design has problems.
Could have screen aimed down and do different colors for different points on the compass so when viewed from below you can see that it knows which way it is pointed. And it would be fun. Maybe flasshing differnt colors to show battery level or other things. Could show which direction it thinks the wind is coming from.
Still wondering if we could get by with only controlling the motor. Might have motor twist the wing. Might have different speeds make the tail behave different. Like the centripital force might rotate it to make it work differently. Like full power on motor overpowers the tail and rotates the wing a bit. If we can normally operate on half power on the motor, this might work. Motor can be above wing so less danger of getting hit on landing and so can torque the wing.
Ultrakote is 3.4 grams per square foot, much lighter than monokote.
Ordered a Sony Smartwatch 3 and a Heli-max on Nov 14th.
Weight budget 250 grams:
Watch: 50 grams - without band
Cover: 7 grams
Battery 1200 mah: 23 grams - if we have extra use bigger battery
Bluetooth: 17 grams = guess so far - TinySine duel motor controller- could also do a light
3D frame: ?
1) Can compass handle 5 rps or 10 rps? - Test spinning phone seems to say yes.
2) Can bluetooth control work at 1/10th second? I think so.
3.7 volt 1500 mAh batteries that are 40 grams. So flight time of around an hour might be possible.