Hi everyone,
I spent the afternoon testing a Multiplex Funjet in a wind tunnel at Kingston University (London, UK) since I need this data for my dissertation project: I will be optimizing it for longest range/glide/altitude/climb rate with the help of Arduplane hardware (ardumega, shield, gps and airspeed sensor).
Within a couple of weeks I will be plotting similar curves for different elevator settings, as well as Turnigy 2836 performance (thrust vs current draw at different airspeeds, up to 34 m/s - 122.4 km/h) with APC 5x4.7 prop.
If anyone is into optimisation of this aircraft for long range UAV I'm sure you will find this data interesting, that's why I'm posting.
In a nutshell, this aircraft stalls when AoA reaches about 13 degrees. Best L/D obtained is 4.95 at 10.5 degrees AoA.
Interesting to notice the model was tested up to 128 km/h, thus generating about 8 kg of lift and 1.6 kg drag. The wake generated after reaching stall angle shakes both tail fins violently, I need to trim the video footage which will be on youtube soon.
You can have a look at the chart attached, taken at 20.5 m/s; this is a typical cruise speed for this model - 73.8 km/h or 46.1 mph.
Any suggestions for next tests are welcome!
Emiliano
London
Replies
Excellent work Emiliano, perhaps you could do the same with a Blixer which seems to be the airframe of choice around here at the minute ;-)