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What is the stall speed or minimum speed of the Skywalker X-8

Posted by Adrien HADJ-SALAH on December 18, 2014 at 10:03am

Hello everyone,

I'm looking for X-8 users, Skywalker X-8, more than 2m wingpsan, I wanted to know if you have data about the minimum speed you were able to glide or stall speed. I read somewhere that the speed range is 55 to 110 kmh, but I find it fast.

Actually, I evaluate the minimum speed using 

mg = 1/2 Rho * S * V² * Cz

with mg = 9.81 * 2 (2 kilos)

and 1/2 * Rho * S * V² * Cz with Cz = 1 and S = 0.8 (80 dm²)

I fand something around 6.4 m/s which is really slow, is it real ?

Thanks a lot,
Adrien

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Replies

  • Adrien HADJ-SALAH December 18, 2014 at 11:26pm

    Thanks for your answers, maybe Cz = 1.0 is too strong for this model.

    • Andrew Rabbitt > Adrien HADJ-SALAH January 2, 2015 at 7:55pm
      The maximum lift coefficient you can bet on for a flying wing would be around 0.7 or, if you're really good and throw all the fruit at it, you might stretch that to 0.75 in the real world. This is the archillles heel of the flying wing concept which limits its widespread adoption.
  • Moderator
    Gary Mortimer December 18, 2014 at 11:25pm
    Keep pulling till a wing drops
  • Hans Miller December 18, 2014 at 9:56pm

    Nope, 6.4 m/s is not going to happen.  11m/s at 5kg.

  • iskess December 18, 2014 at 8:58pm
    My X8 stalled at about 10 m/s (36 kph) at about 3 Kg.
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