This week has been very windy, so I thought I'd try flying the Raptor 140 in gusts of wind over 33mph/53kph. This is also one of the requirements of my USA trip, to be able to fly in over 40kph winds. And.... It flew great!

I tested the bungee take-off, which worked perfectly as I aimed it into the wind, the Raptor navigated the airspace with ease as it has tons of power, great CG and a low profile, enduring the turbulence well, and finally, was able to land safely. Perfect!

Next week I'll attempt to fly a marathon - 42km (26mi)!

See you next week!


Raptor 140b Stats:
Weight: 1780g
Max Flight Time: 80min
Max Range: 75km
Stall Speed: 30kph
Cruise Speed: 95kph
Max Speed: 135kph
Radio Range: 1.5km
Energy Carried: 10,000mAh
Power: 850w

The equipment used---
Raptor 140 airplane:

Radio Tx: ParkeFlyer Turnigy 9x Tx:
Telemtry: 915mhz 100mW 3DR
Laptop: Compaq Presario CG57

Flight Controller: APM2.6
Reciever: 6ch FlySky
Telemtry: 915mhz 100mW 3DR
Battery: (2) 5.0Ah 20C Turnigy Lipo:
ESC: 60A Brushless
Motor: 3542 1450kv brushless
Prop: 10x7 Carbon Fiber Folding
Servos: 11g digital
Onboard camera:

Learn More:
Raptor Details:
USA Trip Details:

Follow the Show:
Skype: MyGeekShow

Filmed, Edited, Produced and Published by Trent in Arkansas, USA

Views: 922

Comment by ctech4285 on December 21, 2013 at 9:47am

oh very nice, I can see that the prop velocity is around 200km/h, good match for 135km/h flight speed. I am curious what the range would be if this was setup for endurance, eg low rpm large prop for optimized for the 30-45km/h speed.

Comment by Stephen Carlson on December 21, 2013 at 10:57am

Trent, you've gotta post the airfoil(s), root and tip chord lengths, quarter-chord sweep angle, and washout angle! I'm going crazy wanting to compare the performance your getting with other wings to see what works best!

Comment by Trent at MyGeekShow on December 21, 2013 at 12:51pm

@ctech4285: The Raptor flies great at slower speeds, and has a stall speed of about 25 - 30kph. The "sweet spot" I am optimizing for is 100kph.

@Stephen, I'm messaging you additional details now.

Comment by Mark Harrison on December 21, 2013 at 5:56pm

Do you worry about the bungee fouling the rear-mounted prop?  When do you apply power?

Comment by Trent at MyGeekShow on December 21, 2013 at 6:39pm

Mark: I was worried about it at first, and tested it a few times while the prop was spinning slowly, but after a few a tests and watching the slow motion video I feel confident it isn't going to be an issue. I apply power (about 1/4 throttle) basically as soon as I can get both hands on the throttle, and then I don't power up to 1/2 - 3/4 throttle until its clear of the bungee.

Comment by Gagarien on December 26, 2013 at 1:05am

Hi Trent very nicely done keep it up flying wings are the best!!! Would you please share your Parameter file I assume you are using 2.76.


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