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Wet field

Sat Nov 11, 2017 9:08 pm by Gary M Jones

Went to the field in the forlorn hope of someone being there.. not to be.

FIELD SECURITY .... The gate padlock issue seems to have been resolved with 'farmers' twine' !! This is now the only security & whoever has done the job has been to …

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Build in lightness!!

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Build in lightness!!

Post by Brian Colclough on Thu Mar 25, 2010 8:43 am

I found this picture on a thread on FG the kit's a 40% Dalton (Extra I think) 170cc. The guy whose a professional builder in Florida has lightened the wing cores somewhat, they are shown before being skinned with balsa sheet the black lines you see are carbon tows glued to the foam. Lot of work to save some weight but I bet it'll fly fantastic Wink


Would be nice to know how they compare to composite wings weightwise Question

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Re: Build in lightness!!

Post by Guest on Thu Mar 25, 2010 9:45 am

Wonder what he charges for all that work. I read of one guy who builds scale helicopters to order and charges $5000.00 labour Exclamation

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Re: Build in lightness!!

Post by Brian Colclough on Thu Mar 25, 2010 9:47 am

Apparently this guy's built 28 of these Dalton kits in the last 2 years Wink and often works 14 hrs a day

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Re: Build in lightness!!

Post by PDQ on Thu Mar 25, 2010 10:14 am

Impressive piece of work, meticulous detail, must have taken hours. Are you buying one?

Reminds me of my days at Avro (Hawker Siddeley) when they began to introduce fully CNC milled wing spars (Vulcan)and eventually fully milled all in one spar/rib wing panels on the newer designs.
After numerous calculations and stress dept. consultations, these were seriously tested out in a structural test specimen before ever getting to be in a real aeroplane. Later this approach became the basis for Air Bus etc.
All the swarf was returned to the foundry so there was no waste.

The weight savings compared with the old way of multiple riveted joints between skin, spar, ribs intercostals was astonishing.

But in the modelling world, I do wonder if massive detailed work like this, (explained as to save a few grams), is really justified.
Was all the cutting and chopping done with supporting calculations and meticulous testing from various prototypes or was it just this modeller's own one off fantasy?
He seems to have impressed some who are happy to throw lots of money at him so good luck to him.

Don't get me wrong
I do admire the man's determination, stamina and patience (and cheek) but I prefer a more pragmatic approach. Low cost/high fun has to be the consideration in my own modelling adventures.

If I had the bucks?? Nope I wouldn't buy one,
...........but I .........might think of buying one for your birthday Brian
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Re: Build in lightness!!

Post by Andy Sayle on Thu Mar 25, 2010 10:18 am

The A380 wing panels are still made with seperate skin panels, stringers, ribs and spars that are rivetted/bolted together.....

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Re: Build in lightness!!

Post by Andy Sayle on Thu Mar 25, 2010 10:27 am

Just a thought too, the layout of the carbon reinforcements is not particularly effective on those panels too, especially on the aileron. They are not really contributing much to the torsional stiffness of the aileron (which would normally be a desirable property of a control surface).

I reckon all that is for the looks and "wow" factor, rather than the ultimate weight savings. There are much lighter methods of constructing wings of adequate strength (take the construction of the wings on my DLG for example!), but they don't look as impressive as this Smile

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Re: Build in lightness!!

Post by Brian Colclough on Thu Mar 25, 2010 11:30 am

I think by the time the ailerons have got the three servo linkages hooked up Andy there won't be too many torsional issues Wink

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Re: Build in lightness!!

Post by Andy Sayle on Thu Mar 25, 2010 11:46 am

'tis true.... Smile

I've never really seen the benefit of driving a single big surface with multiple servos though. The reasoning given is usually that the increase in applied torque is beneficial, but for me, the increase in non-desirable failure modes would be a big detraction.

It makes much more sense to split the control surface, and use a single servo on each surface. The failure modes are much more pleasant that way...

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Re: Build in lightness!!

Post by Brian Colclough on Thu Mar 25, 2010 12:00 pm

Illegal in IMAC circles my mate Wink

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Re: Build in lightness!!

Post by Andy Sayle on Thu Mar 25, 2010 12:08 pm

What, multiple servos per control surface, or split control surfaces? I don't suppose you happen to know why?

Just interested.... Smile

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Re: Build in lightness!!

Post by Brian Colclough on Thu Mar 25, 2010 12:32 pm

Multiple (split) control surfaces, with my honest hat on I'd have to say I don't know why jocolor

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Re: Build in lightness!!

Post by Andy Sayle on Thu Mar 25, 2010 1:46 pm

It seems a little odd to me, I would have said there was a good safety argument for having split control surfaces on a large scale model.

That said, there obvioulsy isn't a huge issue with it, as the failure mode is pretty unlikely....

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Re: Build in lightness!!

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