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Flying Start Models Slingsby T.31B - RAF Air Cadets


Iain

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1 hour ago, geedubelyer said:

Looking great Iain :speak_cool:

 

The cockpit parts look very smooth and devoid of layer lines. How much prep and effort is required to get them to this state or are they smooth right from the off?

All 3d printing process's leave layer lines on the surface. And it is not just a case of looking at the nominal layer height of the machine. Method of layer creation, part orientation, material, optics, machine set up and cleanliness, and a load of other factors have an impact on this issue.  With this kit, I have tried hard to minimise the layers, but it is always going to be a compromise between reliability of build, economics, strength, position of supports, material stiffness, and much more besides. No 3d print will ever be as smooth as an injection moulded part. So you will always have to do some kind of prep work, although this can vary from a whiff of primer paint, to going hard at it with a blacksmiths file!! 

 

I can send you a sample part if you can cover the postage, if that would help!

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4 hours ago, geedubelyer said:

Looking great Iain :speak_cool:

 

The cockpit parts look very smooth and devoid of layer lines. How much prep and effort is required to get them to this state or are they smooth right from the off?

 

On the cockpit examples in my photos there's no surface prep - apart from the seat squabs, which have had a light sanding - just a coat of paint!

 

Yes, you can see fine lines if you look carefully - but I don't think they'll be noticeable on the finished - and buttoned-up - cockpit.

 

The main airframe parts have had a light sanding with fine wet and dry - just a minute, or two. And, to be fair, any hint of layer lines actually looks like a fabric effect!

 

Tim really has nailed the printing on this one - and has the background experience, and expertise, to get the most from the technology IMHO.

 

Iain

 

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22 hours ago, wunwinglow said:

622 GS,  XE800, XE806, WT873, WT898, WT901, XA294,   Old Sarum, then Upavon. 

 

WT898 at Upavon 78-79

WT901 at Upavon 79

XE800 at Upavon  79

 

Hope this helps, dates are a bit vague!!

 

 

My 3822 shows I joined in Sep 81. Glider flying shows:

 

XE901, Mk3 Aug 82

WL990, Z-bird, Aug 82

XE800, Mk3, Aug 82

XA309 or 7, Mk3, Mar 83

XA302 Mk3 x 2 trips, Mar 83.

 

I recall the Z-bird trip. We went into the smoke of a burning field and came out over 4000ft. Pilot was really please, something to do with his log book. I remember spoilers being deployed as what seemed a vertical decent. Loved gliding apart from cable release, which I never got used to.

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On 3/17/2022 at 4:48 PM, Anthony in NZ said:

What a stunning kit,  Well done Tim and lovely work Iain!

Not a subject I would build unless the RNZAF Air cadets used them?  Maybe I should checK?

 

Either way, beautiful kit and I look forward to see what you might do next?

Cheers Anthony

 

Thanks Anthony! ... and what am I doing next? Motorcycle trip to Spain, with any luck!

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More progress...

 

The front and rear bulkheads bonded in place using extra thin superglue.

 

Spoiler actuating leavers fitted.

 

Cockpit area sprayed Interior Grey Green.

 

Data 'placards' added - from the kit decal sheet (includes spares).

 

48b427_7fe107b8000c44e185ded73c35050054~
 
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Instrument decals added and panels dry-fitted in place - along with cockpit floor section.
 
48b427_dfdeef5b73a542c2b0772283a81f349b~
 
More work to do on the panels.
 
And the bulkhead fit - I filled the extremely minor joint lines with decanted automotive primer, applied by brush - let dry overnight and gave a light sanding before paint.
 
This is the result:
 
48b427_caaaaf0eea35487ea1855d7deeaf26ec~
 
48b427_c4465cb4ab784503832f0a95fa03bbd8~
 
More when there's more - but a great change of pace so far! B)
 
Iain
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  • 3 weeks later...

Just a quick update, following a visit to a local gliding club, it was pointed out the elevators always sag when the aircraft is parked up,, and indeed, that is why the tips are cut off at that angle so they don't drag on the ground. I have modelled and printed a second tailplane with the elevators in a more relaxed position, so there is a choice of these parts available now.  I am updating the instructions over the weekend, so will post a link when done. Anyone with a kit that wants a drooped part ( sorry....) let me know.

 

Also, work has started on a couple of crew figures too. Early days yet, but more news shortly.

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A little more progress...

 

Seat cushions added - important to note that they are different lengths - they'll only work one way!

 

48b427_eec4ddcce8af4201b44ddd5dadc34c40~

 

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I used a punch and die set to create flat clear glazings for the instruments - added over a small blob of clear varnish to hold in place.

 

Panels were then installed - adding thin superglue from behind each panel.

 

48b427_90f8688cadef468db33114c05268bc34~

 

Added separate spoiler linkages from 0.2mm silver steel rod. There are 'printed in' linkages - but I just wanted to add a little 'bling'.

 

48b427_177b006aeb6b479185c8208ed68225a1~

 

48b427_13a5fe11fc904246bacf7266236191bd~

 

Next - buttoning up the fuselage/cockpit...

 

Iain

 

 

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A few minutes work with some 400, then 800, wet and dry and the forward fuselage section is perfectly blended in:

 

48b427_012cd0a6ac2a42e8a685ac4a2386d156~

 

The wheel housing has also been bonded in place - again, a perfect fit.

 

And a dry fit of the printed seat straps - they work beautifully! May have to trim a little off the bottoms to get them flat on the cushions - but for a first dry fit they work!

 

48b427_45b1d21c7bce44439b662e2ead234194~

 

Iain

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Tail surfaces have been removed from their print supports, and the elevator separated from the tailplane so that I can re-fit at a jaunty angle.

 

Tim will be changing these in subsequent kits...

 

48b427_5b469427dca04feeb1b529219a0b241f~

 

Spoilers fitted in the closed positions on each wing half - and the stainless 'spars' removed from the box:

 

48b427_959fd88cd1c6452cad5e732124d8ea32~

 

This is just a dry run - and I need to cut a couple of brass rods to go front and rear - but these rods just slide perfectly into the holes in the wings:

 

48b427_1657bd1c8a4d4250a66a97dc00f2789c~

 

And, partially slid together:

 

48b427_e2582c8543224e19a9b0f7180b2116a8~

 

All the way home. Not bonded yet - but this is going to be very straightforward!

 

48b427_f3ae7741ddcd477dbefbc977b5038df7~

 

Blue skies,

 

Iain

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On 3/11/2022 at 12:33 PM, kensar said:

Separating those seat belts from the supports looks like a dicey proposition.

I'm interested to see your notes on working the 3D resin stuff.  Is the resin flexible in any way?

I have rearranged the strap parts slightly to make removal a bit easier, and am using a so-called 'Tough' resin which is a little less brittle than the standard stuff, but all the originals came off with out any problems anyway. You MUST use SHARP flush cutters though, squeeze gently and.... it cuts. 

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Back on the T.31 - and more progress...

 

The holes at front and rear of the central wing joint have been opened up with a 1mm drill bit, in a pin vise, and short sections of 1mm brass wire (supplied with the kit) cut to act as additional alignment - details are in the instructions.

 

48b427_03a6d860e8484527ba3f2dac1c6f72aa~

 

Ailerons: holes in wing and ailerons opened up with a 1mm drill - and sections of 1mm diameter brass rod bonded to the ailerons, before trimming to length:

 

48b427_d5cf8af28ed0431d8b0348f3cad272d2~

 

Assembled wing, using superglue - and access wiped away after drying using de-bonder. Ailerons are dry fitted at present:

 

48b427_63b857cb396f40c4847845a40498c0e2~

 

All good!

 

Iain

 

 

 

 

 

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