20mm EDF DH108 Swallow build and flight

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Site Admin (Dave)
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20mm EDF DH108 Swallow build and flight

Postby Site Admin (Dave) » Sat Aug 01, 2020 12:20 am

I was working on a 20mm EDF fan unit some time ago and although the fan was done, I had no jet to put it in. My thoughts were for it to be a replacement for jetex motors since the rules are quite strict Down Under, so a jetex plan seemed the logical choice. I settled on a DH108 Swallow designed by Steve Bage. It came in at 50g inc. battery.
Wingspan: 15.5"
Battery: 150mah 2S
Receiver: Orange micro 4 channel
Fan: Custom built 20mm EDF (3D printed on a Michelangelo) using a 0703 outrunner and clipped 3 blade micro quad-copter propeller.

Maiden was a little squirelly!
https://www.youtube.com/embed/BLnQS6RbK-8

After a mod the next flights were much better!
https://www.youtube.com/watch?v=CjmBGM5Uf1Q


DH108_9.jpg
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DH108_13.jpg
DH108_13.jpg (423.44 KiB) Viewed 152 times


DH108_final.jpg
DH108_final.jpg (222.63 KiB) Viewed 152 times
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20mm_6.jpg
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kittyfritters
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Re: 20mm EDF DH108 Swallow build and flight

Postby kittyfritters » Sat Aug 01, 2020 4:37 am

Very impressive for a model that is 50 grams with only a 15.5 inch wing span! I know that the video does not give the same resolution as the Mk 1 eyeball but do you have any trouble keeping it in sight?

KF
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Site Admin (Dave)
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Re: 20mm EDF DH108 Swallow build and flight

Postby Site Admin (Dave) » Mon Aug 03, 2020 7:22 am

At the outskirts it guesswork :D
Like when I saw the wing dip - I saw it but wasn't sure which way. My eyes are not the best though and I really should wear glasses but they affect the way I see things. I guess I have flown without forever and adjusting would require some time.

kittyfritters
Posts: 191
Joined: Tue Sep 27, 2016 8:13 pm

Re: 20mm EDF DH108 Swallow build and flight

Postby kittyfritters » Mon Aug 03, 2020 9:57 pm

I understand your situation. I was nearsighted and wore glasses most of my life. When I had cataract surgery I chose distance lenses. My wife thought that this was a mistake since I now need two pairs of reading glasses one for reading and one for the computer. She doesn't fly models. ;)
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