100mph on 24kW? Electric Sonex Xenos performance data.

emotodude

Well-Known Member
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Nov 5, 2020
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I did some recent testing with the Xenos and here is some data for ya'll. A repost from my facebook post.

Will my electric Sonex Xenos fly 100mph on 24kW/28 Shaft HP? There seems to be some disbelief that the Xenos will do 100mph on as little power as I have claimed (28 shaft HP). If you do the maths, you'll see you need about 24kW electrical power to get 28hp shaft power (figuring 94% eff motor, 94% eff inverter and 98% reduction drive). I stuck a camera on my hat and another inside the cockpit to try and capture all the instrumentation.

At about ~4:20 I set the power to ~24kW (Hat Cam)
https://youtu.be/TI6LqeuuQh4?t=258

In this video it's about 1:20 (Dash Cam)
https://youtu.be/s5ofdc2WeW4?t=87

Also here is a .igc GPS track with speed/alt data. (24 kw tests start at ~18:36 and ~18:40)
https://skylines.aero/flights/136920

In both directions I held ~85kts (97mph) indicated airspeed with a very stable alt (+/- 30ft) for over a minute to show everything in equilibrium.
if you look at the GPS track and correlate to the video data you'll see I was doing about 90kts one way and then 81kts the other. This avg's to ~85kts, and verifies the airspeed calibration.

So I did fall short, by about 3mph of my original claim. However, I've also added about 50lbs of extra battery since my original testing and I think this accounts for the discrepancy. I also took power and airspeed data in 2kW increments down to 10kW, which is the bare minimum to keep it in level flight at ~50kts.

I should also add that my Xenos is not a shining example of a well built Xenos with lots of surface imperfections, and still lacks landing leg fairings, and needs more tuning on the motor ducting. I look forward to seeing what Paul Dye's build will be capable of
🙂


If anyone wants to see any more test data, just let me know. I'd love to have more excuses to go fly
🙂


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Performance data and charts:
 

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