Posted by critx | Sep 20, 2012 @ 02:18 PM | 2,264 Views
SkyTouch, was initialy a prof of concept project for a future, bigger FPV flying wing.
I can tell, I have googled a lot for an idea but then I've realised that this should be my own design so why not turn my back to google and set some design goals and use available tools to make it.
First I've set the goals for the model:
g1. Max Payload 250g FPV equipment ( 30 to 35 percent of the total weight)
g2. Target wing loading 25 g/dm2
g3. Stable flight for FPV
g1 says 250g is 30% of the toatal weight so we should have more then 830g total weight for the wing. Let say 850g .
g2 say 25g/qdm at max payload results 25 qdm of wing area.
In order to have the g3 asured on a flying wing we need the thing to be a bit speedy which sends me to think best solution is a backwards swept wing and lower aspect ration.
The sweep angle should be between 25 to 35 degres. Aflter I have played a lot on the CG Calculator I decided for this wing that the sweep will be 32.
In order to have a stable flight even some speed is needed so I have choosed an aspect ration of AR=4. From the wing area of 34.2qdm I figured out the wing span is 1.16m. So let's choose 1.2m.
The results are as follows:
Wing area 34.2 dm2
Weight 850g ( without FPV )
Winglet area 2x1.9qdm
Power plant 2830 brushlles motor with 33A ESC and 10x6 prop
Batery is LiPo 3S 2200mA/h
Foam core wing sheeted with balsa then covered with SolarFilm. Initial design...Continue Reading
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