Mike Chantler Posted August 21, 2022 Share Posted August 21, 2022 Started (re)building a 60" plank 3 weeks ago. So thought I would post some pics (selfishly to remind me build). Fuselage is 3D print from here: https://github.com/timdrysdale/fvs60 Wings are hot-wired EPS with wood LE & TE + carbon spars, covered in laminating film. 1 Quote Link to comment Share on other sites More sharing options...
Mike Chantler Posted August 21, 2022 Author Share Posted August 21, 2022 Ballast tube take 11 x 63g slugs: Quote Link to comment Share on other sites More sharing options...
Mike Chantler Posted August 21, 2022 Author Share Posted August 21, 2022 remembered to protect beds this time as PU seeps through EPS and partially glued cores to beds last time (eek!) Quote Link to comment Share on other sites More sharing options...
Mike Chantler Posted August 21, 2022 Author Share Posted August 21, 2022 LE is 3mm cedar to make a bit more ding proof: Quote Link to comment Share on other sites More sharing options...
Mike Chantler Posted August 21, 2022 Author Share Posted August 21, 2022 Sub-TE is 6x6mm balsa glued with foam contact adhesive (this is great stuff). Sub-TE is just to provide nice edge to tape ailerons. Quote Link to comment Share on other sites More sharing options...
Mike Chantler Posted August 21, 2022 Author Share Posted August 21, 2022 Carefully sanded foam and shaped LE (I always ding the foam when sanding - so trued to be real patient, not one of my strong points ...) Quote Link to comment Share on other sites More sharing options...
Mike Chantler Posted August 21, 2022 Author Share Posted August 21, 2022 Glued wings together using contact glue for foam, PU for wood - seeded to work 🙂 Quote Link to comment Share on other sites More sharing options...
Mike Chantler Posted August 21, 2022 Author Share Posted August 21, 2022 Routing ballast tube hole against a straight edge: Quote Link to comment Share on other sites More sharing options...
Mike Chantler Posted August 21, 2022 Author Share Posted August 21, 2022 Similar for 1 piece spars from Decathlon Quote Link to comment Share on other sites More sharing options...
Mike Chantler Posted August 21, 2022 Author Share Posted August 21, 2022 Had old, cheap (non-wing) servos from previous build, so went with these, but proper wing servos would be better. Quote Link to comment Share on other sites More sharing options...
Mike Chantler Posted August 21, 2022 Author Share Posted August 21, 2022 Holding spar down against PU using balsa bridges as in Uber Raven build (and remembered protective tape this time!) Quote Link to comment Share on other sites More sharing options...
Mike Chantler Posted August 21, 2022 Author Share Posted August 21, 2022 Protected wing with endcaps this time (3mm light-ply sandwiched between 200gsm carbon) should of added better gussets(!!).) Quote Link to comment Share on other sites More sharing options...
Mike Chantler Posted August 21, 2022 Author Share Posted August 21, 2022 reprinted fuselage as taped ailerons on before refitting old glued-together fus. which would not fit over taped ailerons! (must get better arrangement for taking fus on and off(!)) Quote Link to comment Share on other sites More sharing options...
Mike Chantler Posted August 21, 2022 Author Share Posted August 21, 2022 Done, and flew well today in 35mph with 9x63g ballast (empty weight = 800g). 1 Quote Link to comment Share on other sites More sharing options...
Mike Chantler Posted August 21, 2022 Author Share Posted August 21, 2022 Apologies for the rapid fire posting 🙄 Quote Link to comment Share on other sites More sharing options...
Mike Chantler Posted August 21, 2022 Author Share Posted August 21, 2022 Apologies for not posting as I built - just seemed to get carried away 🙄 1 Quote Link to comment Share on other sites More sharing options...
MattyB Posted August 22, 2022 Share Posted August 22, 2022 Very nice work; it looks like a Gulp so should fly very well (straight LE planks always seem to turn like demons). I'm not so sure about a 3d printed fus on an EPP wing though - a model like this is likely to take a lot of hits (S.L.O.P.E = Smashed, lost or pulverised, eventuall!), but PLA is rather brittle, especially in the cold. Quote Link to comment Share on other sites More sharing options...
Mike Chantler Posted August 22, 2022 Author Share Posted August 22, 2022 Thanks MattyB, yes we thought the 3D print would be too fragile too, but the first one outlived its wing(!). The fus is quite short and has 5-10% infill (circa 250g) so is surprisingly robust. The sheath nose is fragile and cracked after a very fast impact, but was easily super-glued back together. A friend has a 3D printed spit - and it is fragile. This is very tough in comparison. 2 Quote Link to comment Share on other sites More sharing options...
Mike Chantler Posted October 3, 2023 Author Share Posted October 3, 2023 (edited) So after a year of abuse and circa 150 flights or so, the nose finally gave up it's attachment to the rest of the fuselage 😮 It did have some pretty rough landings and the fastest I flew it in was 50mph gusting 60 with full ballast - main problem was me misjudging how far blown back it got, or deciding not to risk going round again and landing with quite a thump. Things I liked: - quick build and very cheap (I was try to see how cheap i could make it 😮 ) - wing is very tough - it's light (800g) with no ballast so will fly in 8mph or so - the top and bottom one-piece spars from Decathlon gave it lots of strength and stiffness - given it's speed range it got taken up every Sunday 🙂 Thinks I didn't like: - wing looks very tatty as laminating film does not shrink well after EPS has been bashed - the correx ailerons were perhaps penny-pinching cheapness carried too far(!) should of gone for reinforced balsa - has yaw jitter, maybe due to short tail moment and non aerofoil fin - needs good ballast to roll quickly (or perhaps stiffer ailerons) - no place for switch - nose coming off 🙂 Edited October 3, 2023 by Mike Chantler 1 Quote Link to comment Share on other sites More sharing options...
Mike Chantler Posted October 3, 2023 Author Share Posted October 3, 2023 So plan is put holes through underside of fuselage to take a second ballast tube (and maybe do away with the wing tube if I build a second wing) A lightweight carbon tube that will take 15mm slugs will fit quite far back - but main reason for fitting it is to give strength. 2 Quote Link to comment Share on other sites More sharing options...
Mike Chantler Posted October 3, 2023 Author Share Posted October 3, 2023 Am hacking the design in Fusion and printing as I go along: front tray modified to take carbon tube and 2/3AF cell pack 1 Quote Link to comment Share on other sites More sharing options...
Mike Chantler Posted October 3, 2023 Author Share Posted October 3, 2023 2nd section now has switch fitting 🙂 and fluted front holes to allow printing with no internal structure 1 Quote Link to comment Share on other sites More sharing options...
Mike Chantler Posted October 4, 2023 Author Share Posted October 4, 2023 Ballast tube for part 3 added: Five fuselage components printed. Intrigued to know how all up weight will compare with mk2. Part 4 modified to allow fin to go further back. 1 Quote Link to comment Share on other sites More sharing options...
Mike Chantler Posted October 7, 2023 Author Share Posted October 7, 2023 (edited) Taped old wing back and balanced at 860g which is still pretty light. All my fine ideas about refurbishing the wing, redoing the decoration etc, went out the window in the excitement of having it out again lol(!) Suspect that if I used carbon/balsa ailerons the weight would shoot up quite considerably as they are way behind the CoG as is usual with a plank. However, I'm already thinking that it would be more fun if it was more streamlined and had stiffer aileron things at the expense of weight. I have cut a couple of PW51 wings to same planform and so these may go on next incarnation 🙂 w Tail now 60mm further back so will see if this helps the yaw jitter. The linkages could definitely be lowered a couple of holes and fairings added. But very pleased with how quickly the whole thing printed and how easy it was to put together 🙂 We have a low going through tomorrow so may not get it up the hill for a while. Edited October 7, 2023 by Mike Chantler 1 Quote Link to comment Share on other sites More sharing options...
Mike Chantler Posted October 20, 2023 Author Share Posted October 20, 2023 Did manage to get into the hills last Sunday - and it flew well in moderate winds with 1/3 ballast. I forgot about looking for the tail jitter, but as I didn't notice it perhaps moving the fin back has fixed it 🙂 It could do with being a little faster - it's faster than a 45" Wildthing, perhaps slightly slower than a Gulp, and definitely looks slower than a couple of streamlined moths that were up. Wing is quite tatty now - so servo covers and tidy might speed it up a bit and have cut PW51 wing for it which I may fit in a while 🙂 One thing I did like was, despite the fact I like building, was just fitting the 3D print parts together - nice simple assembly when work is eating up your evenings 🙂 🙂 1 Quote Link to comment Share on other sites More sharing options...
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