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Author Topic: Let's talk E20  (Read 52233 times)
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Yak 52
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Free Flight Vagrant

« Reply #725 on: May 16, 2018, 07:34:41 AM »

Here's a couple of pics of my first 'Peterborough Open E20'. The rules allow any motor, battery or timer for an 8 second run.

This is a bit of a cobbled together model to try out a direct drive Racerstar 8520 drone motor on 1S, supposedly capable of 35g of thrust. The model came out at 32g and climb is similar to my Ferry 500, not quite vertical but pretty decent. The wings and tail are from my original 2014 E20 and use a 9% thick modified BE50 section. The wing mount has been taped on until correct the position is found.

Flying in the PMFC Ferry Meadows series yesterday was a bit tricky due to blustery turbulent conditions but the light model seems to have potential. I've ordered an even hotter 8mm motor and my next idea is to try a solid CLG/HLG style wing. This came out at 9g but has a little higher aspect ratio ie less wing area.

The other direction for the Open E20 class would be to go for much more thrust from brushless motors at a higher weight. It should be possible to make the 50-60g F500 style model with something like 2:1 thrust to weight ratio!  Grin Shocked I'm not sure how wise this would be however!

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« Reply #726 on: May 18, 2018, 09:10:08 PM »

My E-20 prototype #4 about ready for test flight.  For flight trimming I'll fly it with micro r/c assist with control over the throttle, and then switch out the r/c with the timer shown from microflierradio.com.
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