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Author Topic: VMC Spitfire Night Fighter  (Read 2384 times)
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avrovulcan
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« on: January 29, 2019, 04:57:41 PM »

This will be my first free flight model I have made in a very long while. It is a Vintage Model Company night-fighter Spitfire.

I have made a start by building the centre section. I had no problems, as I had found a video by Rob Brennan constructing the same model, and also the builds by Jack Plane and abl were very useful.

Here's my start.
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VMC Spitfire Night Fighter
VMC Spitfire Night Fighter
VMC Spitfire Night Fighter
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Russ Lister
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« Reply #1 on: January 29, 2019, 07:07:19 PM »

Good luck with the build .. plenty of help available here, as you have already probably noticed.  Smiley
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Rhys
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« Reply #2 on: January 29, 2019, 07:59:25 PM »

Really good thus far, AV. Nice and square. Looking forward to your build Grin

Rhys
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Andy Blackburn
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« Reply #3 on: January 30, 2019, 07:04:25 AM »

Good luck with this - it's a nice kit that captures the essence of the real thing.

Andy
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avrovulcan
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« Reply #4 on: January 30, 2019, 05:57:02 PM »

Thanks for the comments. They are appreciated.

Today I made the wing sections. Just need to let them set and then give them a light sanding.

Enjoying this build so far. I know it gets more complicated soon though.
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Re: VMC Spitfire Night Fighter
Re: VMC Spitfire Night Fighter
Re: VMC Spitfire Night Fighter
Re: VMC Spitfire Night Fighter
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OZPAF
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« Reply #5 on: January 30, 2019, 07:46:58 PM »

Nice work - I enjoy these VMC Spit builds.

John
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Rhys
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« Reply #6 on: January 30, 2019, 10:19:57 PM »

It appears to be a laser cut kit...is that right? If so it's done very lightly, which will mean less prepping prior to covering. Your wing is looking good, AV.

Rhys


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DavidJP
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« Reply #7 on: January 31, 2019, 03:41:12 AM »

Doesn’t that look nice?  Takes me back to my childhood.  We are so fortunate now.  Then it was a case of hacking away at rock hard “Balsa”? With a broken razor blade.........
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Andy Blackburn
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« Reply #8 on: January 31, 2019, 05:00:58 AM »

> Then it was a case of hacking away at rock hard “Balsa”? With a broken razor blade.........

Ah!  Smiley  Reminds me of that special 16 lb/cu ft "Keil Kraft" balsa...

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avrovulcan
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« Reply #9 on: February 03, 2019, 03:11:50 PM »

Thanks for your comments.

Rhys - yes, it's a laser cut kit. The burn marks are, thankfully, very light and should make sanding an easier job with not so much burn to erase.

Ahh, yes the hard as nails balsa - I remember it!

I have now completed the fuselage, tailplane and rudder, the noseblock is drying and I will shape it tomorrow.

Tailplane and ruder were quite straight forward. The fuselage wasn't hard to construct, it was just fiddly. I broke one of the formers over the wing area when trying to fit one of the stringers, but managed to stick it back together and the break seems to be quite strong again.

I have dry fit the parts together and can see the lovely lines of the spit.
Attached files Thumbnail(s):
Re: VMC Spitfire Night Fighter
Re: VMC Spitfire Night Fighter
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Re: VMC Spitfire Night Fighter
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« Reply #10 on: February 03, 2019, 03:20:51 PM »

Looking good Avro, a neat looking build.  I don’t think that there are many builders here that haven’t broke the odd former or two.  Grin

I just noticed in one of your pictures, that you are missing a little 1/16” square rib to the base of the fin, where is meets the tail plane

Andrew
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avrovulcan
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« Reply #11 on: February 03, 2019, 04:00:46 PM »



I just noticed in one of your pictures, that you are missing a little 1/16” square rib to the base of the fin, where is meets the tail plane

Thanks, well spotted. I have also noticed I have missed 2 triangular gussets in the tail plane too.  Roll Eyes

Are you the A J Darby who designed the kit? (I think I saw it mentioned on the forum somewhere) I would like to say it is a very fine kit and as a beginner I find the instructions and plans very descriptive and helpful.
« Last Edit: February 03, 2019, 04:16:43 PM by avrovulcan » Logged
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« Reply #12 on: February 03, 2019, 04:52:04 PM »

Yes, that is me, thanks for the kind words.  I am glad you are enjoying it!  Grin

Andrew
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Andy Blackburn
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« Reply #13 on: February 03, 2019, 05:51:57 PM »

Normally, I've broken a stringer or two as well, at this point...  Smiley

Andy
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OZPAF
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« Reply #14 on: February 03, 2019, 07:20:21 PM »

Nice work Avro - ac credit to Andrew's nice design.

John
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DavidJP
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« Reply #15 on: February 04, 2019, 05:54:33 AM »

Well clearly female dexterity and neatness still rules OK.

And your “workplace” looks very cosy I must say.  Weather rather bleak here in Norfolk so I the same as where you are I can I can imagine the incentive to spend time building.

Have you decided on the markings etc. it will carry?
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Jack Plane
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« Reply #16 on: February 04, 2019, 08:03:59 AM »

Looking good Caroline  Smiley

One small thing though:  the kit has sheer-webbing (the sheet with holes in it) as far as the second bay on each wing, but this creates a stress-riser (weak-point) where the next bay(s) just have top and bottom spars (exactly where my top spar(s) broke after too much cartwheeling on trim-flights!).  So I'd think about adding additional sheer-webs from thin balsa with the grain oriented vertically (1/20 or even 1/32 would be stiff enough glued to the inside of the spars) to at least the next bay along.  Shown blocked in in red on the piccie below.

Just a suggestion... and maybe either (blue Spit) Andy or (VMC designer) Andrew might have something to say about this suggestion....?

Jon
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Re: VMC Spitfire Night Fighter
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Andy Blackburn
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« Reply #17 on: February 04, 2019, 11:29:13 AM »

...
Just a suggestion... and maybe either (blue Spit) Andy or (VMC designer) Andrew might have something to say about this suggestion....?

Jon

If it was me, I'd consider running a round needle-file through the outermost three or four holes in the existing shear web to make them progressively bigger towards the tip. This should reduce the probability of it breaking at that point.

A.
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« Reply #18 on: February 04, 2019, 02:32:29 PM »

It isn't a stress raiser per se, it's just the next weakest point along, the stress would be much higher at the root if the first two bays weren't in filled, the bending moment a couple of bays out is less so the force needed to snap the wing will be higher, so although it seems that it makes a weak point the whole of the wing is stronger.

The extra webbing would just add weight and inertia i suppose, but if the spars are erring on the lighter side of hard then some reinforcement wouldn't go amiss...

Another way would be to stand up some little pieces of 1/16" at the "midpoint" of the spars between each set of ribs, this reduces the length of the unsupported spar, which is likely (as Jon found out) to fail in compression and or buckling...

Andrew
 

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avrovulcan
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« Reply #19 on: February 04, 2019, 02:55:06 PM »

Thanks for the comments and suggestions.  Grin

So what about if I follow the advice of you all and file the last 3 holes progressively bigger as per abl's suggestion and add a small support strut as per Andrew's suggestion, do you think that would help strengthen the spar in that area without altering the weight too much?
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Monz
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« Reply #20 on: February 04, 2019, 03:04:58 PM »

Looking good Caroline.

I wouldn't worry too much about those little bits adding weight. The chief engineer at Derby Aerospace designs them so well you'll have a good few grams to play with Wink

Hmmm, I fancy a Spit now myself, already have the three views sized, printed and waiting.
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Jack Plane
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« Reply #21 on: February 04, 2019, 03:11:01 PM »


Hmmm, I fancy a Spit now myself, already have the three views sized, printed and waiting.

OMG!!!!  We're getting a petition up to STOP you having a Spit!!   Grin
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ZK-AUD
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« Reply #22 on: February 04, 2019, 03:34:03 PM »

In relation to the spar question,  if anything really is needed I would try a triangular piece in the third bay under the top spar tapering from full depth  to a point at the outboard end 
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DavidJP
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« Reply #23 on: February 04, 2019, 04:49:02 PM »


Hmmm, I fancy a Spit now myself, already have the three views sized, printed and waiting.

OMG!!!!  We're getting a petition up to STOP you having a Spit!!   Grin

Another memory - the local Councils used to display discreet little notices in various public places stating "No Spitting" when I was a lad - the other one was "No Hawkers"  who were door to door salesmen. 
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avrovulcan
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« Reply #24 on: February 05, 2019, 04:17:34 PM »


Another memory - the local Councils used to display discreet little notices in various public places stating "No Spitting" when I was a lad - the other one was "No Hawkers"  who were door to door salesmen. 

 Grin Grin I remember those!!

I have taken a bit of all the suggestions and added a small triangular piece in the 3rd bay. Hopefully this will help support the spar during the inevitable crashes - ahem, I mean slightly heavy landings!!

i have made the main wheels. The tail wheel I made from some scrap balsa. and the nose is shaped. This is a pic of all the parts as they stand at the moment.
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Re: VMC Spitfire Night Fighter
Re: VMC Spitfire Night Fighter
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