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Nutball

Foam board quick build

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Nigel R05/01/2019 15:55:41
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Well this promises to be the shortest build thread ever.

I built a nutball from foamboard. This is the stuff hobbycraft sell, four sheets for a tenner.
Nigel R05/01/2019 15:56:24
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20190105_103938.jpg

Nigel R05/01/2019 15:59:46
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2854 forum posts
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It is 23 inches diameter. Weight 400g exactly.

Two hobbyking 9g servos. Lemon rx. 2822 motor 1450kv on a 7x4 prop.

Nigel R05/01/2019 16:48:54
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469 photos

Today was calm. Ideal for a test flight.

Pleased to report the rumours are true. It flies superbly.

My six year old did circuits with it for three flights. I chucked it around on a fourth. Great fun. Hovers brilliantly and turns as tight as you like.

I did some laps around a big bramble bush and nearly caught it by hand when landing.

Great stuff.

Took three hours to make it. About a hour of foam and the rest was motor mount and gear install

Dave Hess05/01/2019 16:57:48
301 forum posts
18 photos

There are instructions and free plans here if anybody else wants to build one:

**LINK**

loads of other free plans for nice-flying foamboard planes here:

https://forum.flitetest.com/index.php?threads/sp0nz-plans-index.17136/

Edited By Dave Hess on 05/01/2019 17:02:50

Former Member05/01/2019 17:13:33
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Former Member05/01/2019 17:21:14
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Nigel R05/01/2019 18:44:05
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2854 forum posts
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It was one of your postings on increasing the strength of Depron that first led me to the design, dave m.

Dave h useful link thank you.

Next foamboard I'm thinking of doing a dekan delta which is a halfway between pizza box and regular delta.

Edited By Nigel R on 05/01/2019 18:44:33

Percy Verance05/01/2019 20:03:21
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8082 forum posts
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This model kind of reminds me of my old 70's/early 80's Mick Reeves Disco flying saucer, from 1 inch thick polystyrene. It was a completely flat 24 inch diameter disc with no tip dihedral. Nor did it have an undercarriage. Boy did I have some fun with that way back when........OS .30 power.

Used a sliding tray servo mixer for elevon control. No transmitter mixing back then..........

 

 

Edited By Percy Verance on 05/01/2019 20:20:14

Piers Bowlan06/01/2019 04:54:43
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1771 forum posts
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This is an old video from nine years ago of Capricorn, the flying 'W'. It has been on my build list ever since (I know, I know, - another one!). These low aspect ratio aircraft do seem to fly well, I suppose very light weight and loads of power has it's benefits.

There have been several full sized examples of these low aspect ratio aircraft like the Arup S2 and S3, the Vought V173 flying flapjack, Eshelman Flying Flounder and more recently Milt Hatfields 'Little Bird'.

Edited By Piers Bowlan on 06/01/2019 05:20:21

Piers Bowlan06/01/2019 05:38:27
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1771 forum posts
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In case anyone is interested, the plans for the Capricorn is in the second post here.

Percy Verance06/01/2019 09:12:50
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8082 forum posts
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I'd fully agree re: low aspect ratio craft Piers. My Disco had some quite remarkable handling chractristics. It was completely unstallable for one.....and a fairly rapid roll rate was another.

Dave Hess06/01/2019 11:13:36
301 forum posts
18 photos

You can buy Flitetest waterproof paper covered foamboard in the UK for £2.50 per sheet. It's an excellent material for building planes like the Nutball - and anything else for that matter. Here's my Hots 40 coming on nicely. A plane like this took me only a few hours to make.pre finish.jpg

Nigel R06/01/2019 14:55:23
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2854 forum posts
469 photos
Nice work on the Hots Dave. Foam board is ideal for angular shapes. Is it a proper airfoil?
Former Member06/01/2019 16:12:03
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Dave Hess06/01/2019 16:38:28
301 forum posts
18 photos
Posted by Nigel R on 06/01/2019 14:55:23:
Nice work on the Hots Dave. Foam board is ideal for angular shapes. Is it a proper airfoil?

Yes, much easier than balsa. The wing section is symmetric. I made a test piece that you can see in front of my toolbox back left.

Nigel R07/01/2019 09:39:17
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2854 forum posts
469 photos

Dave M - nice thread. Some good links and "shape" design layouts in there!

The stall characteristics do seem to be the thing that sets the very low aspect ratio craft apart from conventional. I guess it is a side effect of the amount of the wing which operates in the tip vortices.

Nigel R07/01/2019 09:51:41
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2854 forum posts
469 photos

On a side note, if a square has an aspect ratio of 1:1, then a circular wing like this has an effective aspect ratio of 1.3:1.

A little higher than my recent flying carpet effort, which had as aspect ratio of 0.45:1!

The nutball loops much better than the carpet. Other than that it seems somewhat similar in its close-to or post- stall behaviour.

It's also worth noting that the U-channel spine that I used on the underside of this nutball worked very well - I can stash the lipo just in front of the wing in the trough that is formed. And sticking on the motor mount was very easy. Provides something handy to grab when launching, too. I realise this might be a bit of a schoolboy observation to all the foamboard pros out there.

Former Member07/01/2019 16:23:46
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Former Member07/01/2019 16:50:04
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