Multiplex Funjet in wind tunnel!

 

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

wind tunnel 1.jpg

wind tunnel 2.jpg

funjet performance jpeg.jpg

You need to be a member of diydrones to add comments!

Join diydrones

Email me when people reply –

Replies

  • Moderator

    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 ;-)

This reply was deleted.

Activity

Neville Rodrigues liked Neville Rodrigues's profile
Jun 30
Santiago Perez liked Santiago Perez's profile
Jun 21
More…