Flying my Raptor140 at 109mph/176kph

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:

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Skype: MyGeekShow

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

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  • 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.

  • 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.

  • Moderator

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

  • @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.

  • 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!

  • 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.

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