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chiloschista

REDplank-F

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chiloschista

Hi ensemble,

heading towards Fær Øer I need a little plane that fit in a suitcase and can handle islands high winds. Watching around I did not find anything satisfying, so I decided to develop one myself.

Here it is, REDplank-F:

 

Specs:

Wingspan: 120cm

Weight: 670g

Wingload: mathematic 30g/dm², effective 40g/dm²

Ric

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chiloschista

Everything start with a concept:

297867809_2019-03-1910_24_14.thumb.png.c9d07125d6532ce83922b44f87380f2b.png

Followed by some cutting experiences:

 

20190223_180240.jpg

20190224_123606.jpg

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chiloschista

Two 8mm carbon tube wingspars are added. They will host a 6mm carbon rod wing joiner:

20190224_123724.jpg

20190225_151905.jpg

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chiloschista

Flaperons are made of balsa, covered with guess what?

A beer offered to the first one that will guess it (when I come next to UK 🤣).

20190224_162345.jpg

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chiloschista

PLA servo holder.

Crossed control links and everything covered with PLA covers.

20190302_121308.jpg

20190302_121342.jpg

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chiloschista

Wings are joined amd fixed to the fuselage with those two joiners, glued into the wings.

They are screwed into two hard wood dowels glued into the fuselage.

20190304_095745.jpg

20190306_095436.jpg

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isoaritfirst

Sanding sealer and tissue?

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chiloschista
Just now, isoaritfirst said:

Sanding sealer and tissue?

Sanding, spray glue, tape, new stuff.

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chiloschista

Components installation preview:

20190306_095653.jpg

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chiloschista

Photo session 👯‍♀️

20190308_162439.jpg

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isoaritfirst

Heavy?  

I always fancied running a Alu tube along the front edge of the elevons. Light and resistant to twist. Never got around to trying it though. 

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chiloschista
1 minute ago, isoaritfirst said:

Heavy?  

I always fancied running a Alu tube along the front edge of the elevons. Light and resistant to twist. Never got around to trying it though. 

Very light, but penetrates well: 670g (first post and video).

I added a 1mm carbon profile at wing rear edge instead. Wing torsion and flex are limited. Elevons are very rigid already and I took particular care to have play free controls with good servos and good linkages.

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Tony

Very nice, enviable slopes, that's not Lac Leman is  it. Tony

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chiloschista
31 minutes ago, Tony said:

Very nice, enviable slopes, that's not Lac Leman is  it. Tony

No, it's in South Switzerland, lago Maggiore, near Locarno. The city at bottom is Bellinzona.

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chiloschista

Not bad for a light EPP plank.

Data are consistent as flight speed was in general between 100 and 150km/h, often over 150 and few times around 200km/h.

Of course that's ground speed and wind played its role 😁, but anyway it's funny to fly that plane.

508087896_2019-05-0608_36_20-GoogleEarthPro.thumb.png.fd00c58656d5da8e8626ba4df297bd60.png

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chiloschista

Hello,

here is a short video of that flight, with telemetry overlay.

Ric

 

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