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-   -   RC conversion to a Cheetah chuck glider. (https://www.wattflyer.com/forums/showthread.php?t=81697)

quorneng 07-07-2021 04:14 PM

RC conversion to a Cheetah chuck glider.
4 Attachment(s)
I did an RC conversion to a Lidl XL chuck glider which flew well enough but when I saw the similar sized Cheetah it looked a bit more like a true glider.
Attachment 188467
The original wing was already in two pieces so I judged it would make an even better glider with an added constant chord centre section.
Actually a built up structure with 2mm Depron skins over 3D printed ribs and shear web.
Attachment 188468
I judged the Depron skin would be quite adequate to handle all the flying loads.
As I did with the Lidl I added trailing edge 'extensions' to the foam outer panels to give a fine trailing edge rather than the 4 mm thick edge of the moulded foam wings.
Attachment 188469
The new centre section was made to match the extended trailing edge foam wings. These trailing edge extensions also allowed the ailerons to be a bit broader without having to cut too much into the moulded foam..
The foam wing is just thick enough to allow the servo to be glued in so it lies flush with the wind underside.
Attachment 188470
Note the aileron horn is set back abut 3 mm from the hinge line to give a significant mechanical aileron differential (more up than down). Aileron differential is an important feature on a big wing span glider to limit adverse aileron yaw particularly as to save weight the Cheetah will have no rudder being flown 'bank and yank'.
To be continued.

quorneng 08-17-2021 11:21 PM

8 Attachment(s)
After a bit of a delay some progress.
The nose has been carefully converted to not only enclose the motor but with an air intake above the spinner.
Attachment 188509
There are air exhausts on either side.
Attachment 188510
The cockpit area is hollowed out quite a bit.
Attachment 188511
A printed battery holder is glued in
.Attachment 188512
The 10A ESC is mounted in a printed holder set into the outside wall of the cockpit.
Attachment 188513
The 3.7g elevator servo is mounted under the wing.
Attachment 188514
With nylon pull/pull wires direct to the elevator.
Attachment 188515
The completed Cheetah
Attachment 188516
With a 600 mAh 2s it weighs 198g.
Always intended to more of a glider than a power plane it flies sedately under power but has a considerable power endurance of a good 20 minutes which coupled with a good glide and excellent thermal abilities means flights can be quite long.
A rather shaky video of a short flight kept low for the camera.
You have to keep low as at any sort of height it is almost invisible to the camera. Its not that easy for a human to see either!

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