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C17 Globemaster III - 1/15th Scale for PSS

CAD to slope - 133" span

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Olly P29/02/2016 13:20:14
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3215 forum posts
181 photos

Andy - you mention 3D printing some of the parts - is this a machine you have at home or one you have access to elsewhere?

I'm looking at investing in a printer when/if my bonus comes through this year, any suggestions around the £400 mark?

Olly

Andy Meade29/02/2016 13:31:00
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2607 forum posts
679 photos

Hi Olly,

Yes I have my own at home, a 3DDP Up Plus. Here is the version 2, which is quite a good printer, but rather pricey. I got mine 2nd hand for a lot less then half of that price!

I'd heartily recommend a Prusa i3 from a store in the UK. There are lots of people using them, and support for any problem can be dealt with in the UK.

I use SolidWorks in my day job (honestly it's still lunch time...probably) and have a version at home too. I've used it for the best part of 12 years now, so get on pretty well. I know a few people that use Sketchup to great success, but they struggle to do things that are just a few clicks away on higher end software.

They can be a source of income too! Mine has paid for itself already, as I design and sell items through eBay for aeromodelling with some success.

Olly P29/02/2016 13:46:46
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3215 forum posts
181 photos

Andy - I've used a variety of CAD programs, and love Solidworks, but can't afford the pricetag!

Andy Meade08/03/2016 08:50:29
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2607 forum posts
679 photos

A little update today for a few bits an pieces I got done at the weekend. Here is a wiring diagram, so I know where the splits are; know how many connectors I need; and how much servo wire I require.

wiring diagram 1.jpg

Nothing too complicated, but Engineers like making lists and diagrams laugh

Next up, the fin has been cut in 2 positions, and full length 40mm wide lite ply spars inserted. There is a lot of tailplane on top of this to take care of, so things need to be stiff.

20160306_143027.jpg

Gorilla glued together, and taped. On the right you can just see some freshly lightened formers from the tail section. I think I drilled over 80 holes through the formers at the weekend on the pillar drill, all in the name of lightness.

Here is the main-spar former, F7. I have cut a 'ole out of it, but reinforced it around where the main-spar box will run through and key into the fuselage.

20160307_124306.jpg

Some wibbly-wobbly cutting there, but who cares? It's deep in the fus wink.

Onwards!

Andy Meade09/03/2016 13:55:05
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2607 forum posts
679 photos

Another day another update cool

I have veneered the fin and tailplane now. I am starting the marking up of elevators and servo positions, ready to start cutting through the skins. You can see a standard size servo holder on the one half for scale...

20160309_124748.jpg

BIG!

And here is the fin-top - an all lite-ply structure that the tailplane halves will be mounted in. This then bolts through onto the fin, and allows me to change the incidence angle if need be.

20160309_124805.jpg

Holes for servo wires tonight, plus boxing in servo holes. With a bit of luck I'll get the halves joined too.

Toodle pip!

Flyer09/03/2016 13:58:30
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535 forum posts
81 photos

Looking good Andy. thumbs up

Andy Meade09/03/2016 14:00:14
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2607 forum posts
679 photos

Cheers Ade laugh

Phil Cooke09/03/2016 14:36:22
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2253 forum posts
1539 photos

Wow - fast progress Andy, looks great.. Love the wiring diagram too - like you say - you can tell you're an engineer

Andy Meade09/03/2016 14:54:26
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2607 forum posts
679 photos

Thanks boss-man! Yeah the fire has really been lit for me on this one, which is a shame as I have many other projects a lot closer to completion. I try and do a bit on them all, with the C17 being the main "thrust", as I find that's the best way - no matter how little, every tiny bit you can do on any of it will always help in the long run.

David Gilder09/03/2016 17:24:45
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1854 forum posts
656 photos

Wow Wow Wow!!!

Looking very fast Andy.. Cant wait to start on mine after the A4 and AN72!!

Out of curiosity, What is the span for each tailplane half?

Its going to be great having a formation flight whilst getting buzzed by Phil's A10.... as I expect mine will be built around the same time as the A10 being finished!!!!!!!!! hee hee!!!!cheeky

Andy Meade09/03/2016 18:28:13
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2607 forum posts
679 photos

Hey Dave - span is 1460mm across the tail, before the tips are added yes

Harry Twist09/03/2016 18:52:29
294 forum posts
204 photos

Lovely work Andy - project coming on at a rapid rate now! That's a seriously big main spar former!

Regards H

Clive Jones 409/03/2016 22:41:44
15 forum posts
4 photos

1460 Across the TAIL???

We're gonna need a bigger hill!

Clive.

Andy Meade10/03/2016 08:55:39
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2607 forum posts
679 photos

Hi Harry - Yup need to make she's structurally sound! There's a lot of weight being supported here when she's at rest, and the "bump" load when she lands can be quite high, so I can't have any of this buckling. Have you gotten out with the Horten yet?

Hey Clive - yes a bit big! A bigger span in the tail than my last 3 builds' wings! surprise

Edited By Andy Meade on 10/03/2016 09:06:17

Harry Twist10/03/2016 11:06:43
294 forum posts
204 photos

Hi Andy, Ref Horten - not flown yet - still in her onesie in the hangar! Finishing my B&V and trying to clear the decks to start the A4. I am also partway through another correx build ....so a couple of jobs on the go at the moment.

Cracking work on the C17 -have you used any special ply for the formers?

If I lose weight and squeeze in a bit, maybe I could slip into the C17 cockpit on launch!

Regards H

Andy Meade10/03/2016 11:29:17
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2607 forum posts
679 photos

All formers are 4mm gash ply from the builder's merchants. 8 foot x 4 foot sheets are about £12 each, so are ideal for the bulk of this.

The only problem is that it does splinter and de-laminate quite quickly, so I am constantly running around gluing it back together! The tail parts are all 3mm lite-ply, which is so nice to work with compared to the other stuff. I was just going to say "stuff it" and use the 4mm in the tail, but then I remembered the weight problems I had with the A10's tail.

I have made more progress overnight and this morning, I will post some more updates later..

Andy Meade11/03/2016 13:15:42
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2607 forum posts
679 photos

So, tailplanes are now sanded to "first pass sand" level, and one elevator is done - the other needs a quick kiss from the hand plane then a sand from the Perma Grit. Spar grooves have been let-in too; wing tips added (1/2" soft balsa-1/8" liteply core - 1/2" soft balsa); and the hardware for mounting is cut and ready. By the end of the day, this will all be glued up - currently this is a dry fit.

20160311_125211.jpg

It looks ready to fly as-is!

Here is a long & skinny elevator stuffed into position for a photo opportunity;

20160311_125253.jpg

I'm loving that. To do this weekend :

  • plank the top of the fin box
  • add the blue foam LE - cut and create the light pod
  • final fill and light sanding
  • prep hinge mounting holes

That should be ready to cover (silver film) and stick in the loft so it's out the way by midweek.

Andy Meade14/03/2016 09:50:12
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2607 forum posts
679 photos

Bolt have arrived now (M5 x 100) for the tailplane mounting, but I wanted to get the whole assembly outside for a quick picture, as the weather is nice. No, the lawn hasn't been mown yet - too many models to build and paint cool

20160313_140036.jpg

20160313_140058.jpg

Steve McLaren16/03/2016 21:17:49
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218 forum posts
231 photos

Yes it makes a good garden table! You could rest your beer on that tailplane!

Seriously impressive!

Rory connell16/03/2016 21:56:41
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47 forum posts
9 photos

WOW that's epic !

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