Saturday, 18 December 2010

Xplane 9 preliminary sim model


I said I would upload this at some point to the blog, so here it is-



http://www.megaupload.com/?d=F3GXWYP5

This is just the aircraft model, you'll need the program (Xplane 9) which you can get a demo download here. Its no different from the full version, except that you can only fly 10 minutes.

http://www.x-plane.com/pg_downloads.html

Dont worry about the high specs too much - my laptop is only a 1.6 and can run it, as long as you press the "get me lost" button until it makes an airstrip in the sea, anyway. (Hence no scenery in the picture I've uploaded!)

you can fly by the mouse or an analouge controller, I use an analouge. There is an option to view from the airstrip for model aircraft flying, just before you do you'll notice the inside view has a small dial with a wheel on the left of it - thats to adjust the elevator trim. You'll understand why you need it pretty quickly once you get flying.

Just thought this'll be something fun to try and since its a laminar flow sim it'd give a reasonable Idea of how such a design might fly.

Let me know what you think or if you have any problems anyway. Have a good christmas all!

Wednesday, 8 December 2010

Frame Material

Frame work : Balsa wood ribbing with stringers (similar design as picture).

Density - 170kgm3 Board thickness - 3mm






Lining: Solartex (giving the finish of the picture below)
Wing attachment: rubber band (this may sound unconventional but i have seen it on alot of models and its a simple and stable way to attach the wings)



....more will be added later!

Monday, 6 December 2010

URSUS - good example of the design we're looking at.



Full article with links to more pictures here -
http://diydrones.com/profiles/blogs/ursus-epp-platform

Nice example of the sort of design we're aiming for here. it's a bit smaller and more lightweight than our design, but an example none the less.

We're looking for taller gear (as this just drags on the ground, could be a problem launching from and landing on unstable ground) partly for clearance, partly to absorb hard landings. With a 1 kilo payload I don't think something as light as the URSUS would do it, but its a nice example of the design we're aiming for. The prop is going to be lower and larger also than the above.

Hope this inspires anyway guys.

Thursday, 2 December 2010

Propulsion parts

480 O/R 890 (C28-20) ENERG B/MOTOR 4445560

Dimensions: Length 40mm, Diameter 28mm

Thrust with 11x4.7 SF propeller: 1115g

Current: 18.2A

Power: 188W

RPM: 6900

Volts: 11.1V

Weight: 84g


E-Pro SP30A BEC Air ESC

Peak Current: 35A

Dimensions: 42x24x7mm

Weight: 28g