incredible weight in flying wing UAVs

[jlcortex]

Hello,

I have found a flying wing uav with incredible flight characteristics for my experience.

7Kg for a 1400mm and 160km range (inspector 301)
3.2kg for 1320mm (deserthawk)

I used to fly RC airplanes and it is dificult to imagine to load with 7kg such small aircraft!

My question is this:

How can i start to calculate some basic flight characteristics for a flying wing?

- cruise speed vs airplane weight
- drag and vs airplane weight

in order to be able to calculate motor power, propeller, flight time...

Are there any simple software or excel sheet?

Thanks
Jose Luis

 

[GlennE928]

The Inspector 301 has a near-delta planform and a lifting body fuselage. I estimate that its wing area is about 0.9m^2, giving a wing loading of about 76 Pa or 1.6 lb/ft^2.

http://eng.aerocon.ru/inspector/inspector301/

The Desert Hawk has a near-rectangular planform, with an area of 0.325m^2, giving a wing loading of about 97 N/m^2 or 2.0 lb/ft^2.

Both have high wing loadings, therefore high stall speeds, compared to regular model aircraft. The Inspector 301 requires a catapault to launch it, whereas the Desert Hawk is hand-launched. The Inspector 301 is not as remarkable as you seem to think.

This site discusses the design of model aircraft; the link is to a calculator for wing loading and stall speed.

http://adamone.rchomepage.com/design.htm#calculate

 

[GregLocock]

http://smath.info/wiki/Examples.ashx

includes a file that calculates the performance of single propeller aircraft using analysis developed by NACA in the 20s and 30s. It runs on Smath, also available from that site, a free engineering calculation package.

Cheers

Greg Locock


New here? Try reading these, they might help FAQ731-376

http://eng-tips.com/market.cfm?

 

[leo074]

Hi jlcortex,

You can use the XFLR5 software to determinate some basic flight caracteristics for a flying wing but if you want to do some more serious you have to keep in mind much more aerodynamics details if you want to make a controlled flight for your uav.

See you