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Author Topic: E20 with capacitors  (Read 400 times)
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bentodd
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« on: January 10, 2021, 10:24:17 PM »

I first saw this in Free Flight Quarterly, an E20 size plane using a capacitor as the power source.  I wanted something easy so I made mine with Depron.  I loosely scaled a E202 super Pearl down to 20 inch wingspan.  Ordered some 10 F capacitors and small drone motors with props from Amazon.  Added some camber to the wing with a hair drier as much for lift as to add some stiffness.

Flew it for the first time today. I charge the capacitor with a single cell lipo for about 15 seconds.   It was easy to trim since the capacitor has 2 or 3 seconds of full power and then slowly drains down over another 20 seconds.  There is no dramatic transition needed.  Mine flew left-left.  I used a binder clip to hold the pylon on so I could adjust it.

Once I got it trimmed, a launch at 70 deg with authority would give me 30 or 40 feet of altitude and total time of +30 seconds.  Nice for a small park.  Definitely fun.

Next will be a stick and tissue model.
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OZPAF
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« Reply #1 on: January 13, 2021, 07:56:05 PM »

Scaling down a existing FF model was a good idea. I have built a 16"WS model in depron with a 720 coreless motor, 65 dia prop and 15F SC. I used a cheap buck voltage circuit from Banggood to charge it to 3.5V which provided 45-60 secs flight time.

I would suggest you upgrade to a 15F and charge to 3.5V. I  think you will be surprised at the extra performance.

John
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cvasecuk
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« Reply #2 on: January 14, 2021, 07:01:32 AM »

Here is my "Diddie Dixie". It is 20" span and weighs 25g. I charge the 10F capacitor to 4v and set the viscous timer to about 60s. If I didn't have that I would have lost it several times! It is a super 'fun' model. Charge it, chuck it and chase it!
Ron
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Invader3
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« Reply #3 on: January 14, 2021, 12:35:56 PM »

That's really neat, Ron !
I've been thinking of a capacitor powered fun flyer and this looks a great way to go. Any recommendations for motor/prop and where to source?

many thanks,
John
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cvasecuk
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« Reply #4 on: January 14, 2021, 02:13:06 PM »

The motor is a Racerstar 8520  53500RPM Coreless Motor, the prop is standard 65mm, and the capacitor is a SUPER CAPACITOR 10F 2.7V RADIAL.
Just use e-bay for the best price, I think the motors and props came from China. 4 motors were £12, 4 capacitors were £10 and 20 props (10 CW 10CCW) were £6. That was 2 years ago.
I used a small switch between the capacitor and motor.
Ron

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glidermaster
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« Reply #5 on: January 14, 2021, 03:18:35 PM »

That looks great Ron, I love it, one of the nicest little models so far. Please consider uploading a plan!

Just a thought though, might 'Pixielander' be a better name?

John
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cvasecuk
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« Reply #6 on: January 14, 2021, 05:08:32 PM »

To get the plan just take a full size Dixielander and print it at 40%.
That is what I did!
Ron
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OZPAF
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« Reply #7 on: January 14, 2021, 05:15:48 PM »

Quote
I have built a 16"WS model in depron with a 720 coreless motor, 65 dia prop and 15F SC
Whoops! I used a 10F in this model which weighed 20g and flew very well, even though it's not as light as I would have hoped.

I think Ron's approach is spot on for SC models.

John
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Invader3
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« Reply #8 on: January 17, 2021, 01:31:38 PM »

Many thanks for the info, Ron - and I've already downloaded the plan ready to reduce!

John
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Yak 52
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« Reply #9 on: January 17, 2021, 04:46:42 PM »

Here is my "Diddie Dixie"...

I like it!  Cool

Undercambered section?
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cvasecuk
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« Reply #10 on: January 18, 2021, 06:17:52 AM »

Jon, The model is a 40% version of the Dixielander, obviously wood sizes are 50%, and if the wing section was good enough for George it is good enough for me! Here is my rib template!
Ron
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airplay
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« Reply #11 on: Today at 02:33:21 PM »

Hi, the 8520/10F combo? How many seconds i dead air?
Jens
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