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Nutball

Foam board quick build

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Don Fry12/01/2019 15:17:58
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3436 forum posts
40 photos

David, is the motor mount just plugged onto the carbon spine, with a (filled epoxy?) load spreading ( balsa?) cone?

Former Member12/01/2019 16:26:30

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Former Member12/01/2019 16:33:12

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Don Fry12/01/2019 19:25:04
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3436 forum posts
40 photos

Thank you David, got the concept. Thank you for the carbon fibre website. I had lost the address, they are good, and they do epoxy colours, just the job for a epoxy skinned aircraft, to get a weight free base colour.

Query, if you stuff an epoxy coated balsa core, in a protruded tube, would that not improve rotational stability to stress fracture.

Edit, for a fee, my whippets like mice for breakfast. Small high speed bits of fun, the mice, not the whippets.

Edited By Don Fry on 12/01/2019 19:30:34

kc12/01/2019 19:40:02
5859 forum posts
168 photos

As usual David Mellor's somewhat different construction technique is worth studying and gives food for thought.

Some months ago David suggested the HK Donkey ST3511/810kv was a good buy so I bought several. I am tempted to make a Nutball after reading this thread. So what size Nutball would suit this motor David?

kc12/01/2019 19:49:42
5859 forum posts
168 photos

Many aeromodellers give their wife reasons why they need a new plane but saying mice have eaten the tyres is a new one!

Baiting a mousetrap with the remaining tyre might be worthwhile.............

Former Member12/01/2019 21:05:02

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Former Member12/01/2019 21:13:25

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kc13/01/2019 12:19:34
5859 forum posts
168 photos

Thanks David - at 40 inches that's bigger than I expected for the ST3511 motor. Presumably the laminations are 3mm, 5mm and 3mm the same as the 28inch?

That carbon rod L/G looks just like a piano wire job with soldered joints - is it really carbon fibre?

I am wondering how the angled tips are done on all these Nutballs - are they partially severed from the main wing and bent up or are they separate material just glued on?

Former Member13/01/2019 12:53:36

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kc13/01/2019 13:52:29
5859 forum posts
168 photos

I see now - the 'spreader bar' seems to be the bit thats bent to go through the wheels rather than the 'legs' - very unusual to those of us brought up on David Boddington/ Vic Smeed/ Peter Miller designs!

But that's the interesting thing about David Mellor's models and also Nutball style designs -they don't take the traditional construction as the accepted way to build but innovate using any available materials not not just balsa and piano wire. I particularly like the use of 1/64 ply in small pieces as reinforcement.

Former Member13/01/2019 13:57:43

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