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Iain

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Iain last won the day on May 15

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About Iain

  • Birthday 05/22/1966

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    http://www.aeronut.co.uk/

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  • Gender
    Male
  • Location
    Cotswolds, UK
  • Interests
    Flying (Private Pilot's Licence - Chipmunk share owner and occasional Bulldog ballast), Models, occasional magazine contributor, photography, Lotus Cars, 80's motorcycles and this interweb thingy...

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  6. Iain
    Put to one side just now Maru - whilst I actually *finish* some of my smaller projects that have sat languishing for far too long... Will get back to it soon though, if only as I play with designing some of the parts in CAD. Iain
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  14. Iain
    May still be a little while out Peter - but we'll see... Iain
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  19. Iain
    My current concern is twisting of the insert - and the outer nacelles possibly adopting a different angle to the inners as the wing surface is bent around the former. That said - the next iteration will be thicker at it's outer extremity - and should have thicker sides around the gear bay opening - so that should have increased torsional rigidity. More news when there's more news... Iain
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  24. Iain
    That looks absolutely brilliant Kev! Iain
  25. Iain
    Very effective weathering! Iain
  26. Iain
    Thanks for the positive responses - a good sign... Just joking with Tim that it takes two blokes in a shed to fix what a kit manufacturers' design team *could* have got right in the first place - but there you go! A huge thank you to Tim (wunwinglow) for his help translating the initial concept into CAD model - and giving me lots of advice and pointers along the way. It's nice to actually see something tangible come together after so long giving everything a coat of looking at! Iain
  27. Iain
    Last update for now - how does everything work with the fuselage? As I mentioned further up - idea is that wings can be corrected/assembled separately from the fuselage - and inserted after that's all been assembled. The printed core is designed to slot neatly into the existing kit opening in the fuselage - no modifications are needed there. Each side designed to meet in the middle - with 6mm diameter acrylic rods used to help lock and align everything together - these will be 100mm long - so extend 50mm into the wing on each side, beyond the sides of the fuselage. Result should be very strong! Again - ignore the gap! And viewed from the outside. Because of the drastic change to the rear of the wing - which drops below the original kit spar opening in the kit, you'll see a triangular void upper rear. This should be easily filled with a suitable triangle of styrene sheet - but it does demonstrate the change in shape! And with the upper wing section in place and 'wrapped' around the printed former - you can see where the wing sits as moulded in the kit: Nacelles pointing a little high - but that's because I don't have enough hands/fingers to hold everything in place - and planning to add positive locators to the nacelle areas which should ensure everything ends up pointing in the right direction! So, what does everyone think - look better? Carry on along these lines? Enquiring minds need to know... Blue skies... Iain
  28. Iain
    So, is it working? The answer is a resounding yes - and I'm feeling very positive about this project now - after a few years of number crunching and profile gazing! Gentle finger pressure is all that's needed to get the soft, albeit fairly thick, plastic of the wing surface to conform around the printed former. The rear of the former abuts the moulded in rear spar and can be bonded along this edge too. Just 'Mind The Gap' as they say on London Underground - that print error really shows up here - but for the purposes of prototyping can be ignored... I'm confident that glued (Revell Contacta, or tube glue for Polystyrene) and clamped overnight you'll have a very solid upper wing section, to more, or less the correct shape, ready to add the gear bay and lower wing. Iain
  29. Iain
    With the upper wing prepped I could drop the prototype wing core in place and see where we were. For a first test I'm extremely pleased. At the root the printed section fits a treat. The opening for the undercarriage bay is almost perfect - just a little tweaking at two of the corners and should be a snug fit around the kit gear-bay parts, which can be used but will need their upper profile tweaking to fit the new wing cross-section. I'll provide templates for that. Outer cross section has gone a little awry - and needs making larger, so the taper in the printed core will be slightly less - you can see this if you follow the leading edge: I need to think through the outer sections now - as I identified earlier in this very long, almost 4 year old thread, the tip is waaaay too thick in the kit. I can thin the wing - but there *may* need to be a little compromise in cross section as we approach the tip if the leading edge isn't to become distorted. Will be giving that some thought - and an update when ready. Iain
  30. Iain
    For this insert to work the builder will have to remove all of the internal bracing in the wing - apart from, for now, the rear 'spar' section. This is easily done, without any damage to the outer surface of the wing, by cutting where these webs meet, then scribing along each side with a fresh scalpel blade where each web interfaces with the wing surface and snapping away. The plastic is quite soft and this is a fairly quick process - just a little neatening of the surface needed afterwards by scraping with a curved blade. A photo should be worth a thousand words here: The ghosted white lines illustrate the sections of web removed from the mouldings. The rear 'spar' web *will* need to be thinned as it runs towards the tip - but let's get the root profile right first. Ignore the annotations - made sense to make notes in situ at the time... Iain
  31. Iain
    The front and rear sections have 3 x 3mm alignment holes - here I'm using some cutton bud stalks of the right diameter - but will use styrene, or acrylic rod, on the final build. These spigot holes are purely for alignment: And they work: Told you there would be a gap in the mating surface at the fuselage end - gash printing - not a fault with the design... We now have a prototype wing correction insert! Iain
  32. Iain
    OK - first prototype test prints - starboard side: Rear section after it had finished printing and allowed to slowly cool: And removed on the PEI plate. When new parts release themselves from the bed as it cools on the printer - but as the bed ages - and has the surface abraided to continue its service life - the plate needs removing and the part 'popped' off: And with its corresponding front section - printed overnight. That part lifted slightly from the bed - so the section that goes into the fuselage isn't completely flat - not an issue - but you may notice a small gap in following images: Front and rear sections: Parts are printed with a 'brim' to aid adhesion to the bed - this can be removed quickly with fingers if you're impatient (as here!), or carefully removed with a scalpel and sanding stick if you're being fastidious! Followed by the support structure where there's a cut-out for the undercarriage bay: Back in a mo... Iain
  33. Iain
    And - to add - once we know the inserts fit and work - with the openings for the undercarriage bays in the right place - we'll add stubs to the leading edge that fit into the rear openings of the nacelles - and lock everything in position. This will prevent a possible change of engine thrust line being introduced when the kit wing is bent and glued over the former - as well as making positioning on the prepped wing a doddle. In the mean-time, please do not adjust your sets... Iain
  34. Iain
    Hi Steve, Hopefully we're sorted with the printed struts - but I'd use the stainles steel over carbon fibre here as the ends will need to be bent to locate in the holes - and they should be more than strong enough if needed. But, crossing fingers for the performance of the printed ones... Iain
  35. Iain
    Thanks both! First part printed - not perfect bed adhesion - but more than good enough to define where the CAD model needs tweaking. I should point out the formers are separated at the fuselage mid point and are left and right sections - *if* all this works you'll bond the kit wing skins around the printed former - and then, at a later point insert from either side into the fuselage. Where these faces join inside the fuselage there are 2 x 6mm holes that run 100mm from side to side - builder will insert 6mm acrylic rod (or similar) to firmly connect together. *Should* be stronger than the kit assembly! Starboard rear section is now printing - should be 'cooked' by this afternoon, UK time. Have fun... Iain
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