Lindsay Todd
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Everything posted by Lindsay Todd
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Very nice Tim, i like that a lot - great pics too. Linds
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Love the Pitts Graham, always been a favorite and on my list of must do another some time. Back to the Kyosho Spit 90, getting the fuz back together has certainly been a challenge, so much was shattered that almost all the front end needed replacing in the end so lots of measuring and templates have been required but have managed to get the fuz back together I have managed to use the engine mount box but getting the position correct has been an extensive measuring job and no doubt some minor adjustment of alignment and thrust lines might be necessary however the box is now mounted and the structure all reinforced. The fuselage will be glass cloth finish now for added strength but i need to work out the wing position, check incidence and then make new wing fairings as the originals were a real weak point in the original models looks as were way to small. I have taken a quick look at the wing and whilst one half is reasonable intact and at least seams to be ok the other half is not so good and obviously took the brunt of the impact, shattering most of the ribs, leading edge, retract mount and underside sheeting so some thorough assessment is required first then plan a way forward. It was never going to be a quick and easy fix but pleased with the progress so far. Linds Edited By Lindsay Todd on 01/01/2021 22:30:20
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Advent Prize Draw - 24th Dec - last one!
Lindsay Todd replied to David Ashby - Moderator's topic in All Things Model Flying
yes please, best wishes all -
Finally made a start on the Kyosho Spit 90 repair, as the front end is completely shot first job was to try and piece together the remains of the former/s to make some templates. not great as most was matchwood but at least i managed to decipher one this has at least allowed me to identify the outside shape and some datum points in the fuselage so i can get a couple of lines marked that i know are square and good references for everything else. The structure will have to change internally with new reinforcement but a new front former has been made and spot fixed with cyno to set its position, from this i can now work backwards. I have also been able to re assemble the engine mount box and identify its position by piecing together part of the front former and overlaying this. the box can now be trimmed to fit the new front once the structure is secure so generally a good start. I need to work out the shape and fit of the front wing dowel fixing and former next then start keying everything together again. Typically its all about taking measurements and making templates at the moment rather than gluing bits together. Linds
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Spitfire with a difference...HOPE YOU LIKE.
Lindsay Todd replied to ken anderson.'s topic in Chit-chat
Very impressive, really good idea and beautifully done. Linds -
Advent Prize Draw - 21st Dec
Lindsay Todd replied to David Ashby - Moderator's topic in All Things Model Flying
yup will have a go at his one please -
I have done some more work on this design and the plans are now complete, revised the tail to a more conventional V tail and set of cnc parts now cut so construction will start very soon. However one part of the design is yet to be fully resolved and that is the steering. I don't want to loose the 6 wheel layout but this has raised issue on how will it steer during taxiing and take off and landing. i have come up with a flexible wire that applies friction to the inside edges of the front wheels offering a type of brake steering, does anyone have any experience of this or am i down to a bit of experimentation? Linds long shot i know but if you don't ask
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Advent Prize Draw - 6th Dec (leave a post)
Lindsay Todd replied to David Ashby - Moderator's topic in All Things Model Flying
Looks useful count me in. Linds -
ok Jeff, not a problem it seems there might be an issue with F3 although it seems we can work around it quite easily it looks like the 6mm square cut outs are on the wrong end and should be on the base of the former. Don't panic we can either cut 6mm notches in the end as these need to clear the lower edge longeron that needs to be glued to the lower inside edge of the fuselage or trim the longeron either side of the former as it will not impact strength unduly. Like wise with the top 6mm cut outs either and a short length of 6mm square to the top of the fuselage sides on the inside face such that they locate, only a short length would be necessary 25mm or so simply so we utilise the structure of simply glue some 3mm hard balsa and trim to square up the former, either option will be fine. The logeron above the wing chord does not extend past Former F3 simply buts against it as far as i recall as is cut away to form part of the wing structure top section and adds no effective strength behind the former and can be safely removed Linds
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Time to start building something a little different as a new design, this one has been on and off the drawing board for quite some time. I fancied doing something with a bit of a Sci-fi focus to it or even an underlying story line to it. what i came up with is a sort of utility vehicle / aeroplane; an all terrain aircraft. What ? i here you say - well bear with me and it will hopefully make sense and appeal to a few i hope. I almost think Gerry Anderson could have used this one and i guess in part that was my inspiration. So here goes first line drawing visual of Skybug One Yes that is a folding wing and yes there are 6 wheels and yes the fuselage has the aerodynamics of a house brick and yes it has an anhedral wing although the tail may well become a more conventional dihedral V tail once i have done a bit more maths on stability factors. Warned you it was different. Hope to start gluing wood together in the next couple of weeks. Linds Edited By Lindsay Todd on 31/10/2020 19:09:30
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Jeff, i believe you have F3 upside down, the 6mm square cut out locates on the lower longeron which runs from this former forward to F1, the 6x3 cut out is for the below wing seat 6x3 doubler. The top of F3 should have no cut outs as the sides are flush and sheeting over the top. Lindsat
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Jeff, F3 sits behind the wing cut out so is not cut in half, F3a is the rear former to the canopy section so logerons are a but joint hence no cut outs see photo below hope that helps Lindsay
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Hi Jeff, its been a few years since i designed this one but will try my best and of course the prototype was not from the slec cnc kit, that came later however will try my best to help, although any other builders please chip in. it might be easier if you can post some photos to help identify issues you are having identifying the way forward. From memory the rear wing ply plate sits flush with the underside of the wing and then has balsa block infill, then the second ply plate on top before sheeting such that the wing bolt does not crush into the surface. I sometimes wish they did not pre cut the six mm clearance hole as it makes alignment so much more critical that just drilling through later straight through and into the captive nut plate below. he photo below shows the infill which is sitting on top of the first ply plate. 6 mm x3mm strip is glued flush to the wing seat internal faces for added strength to the wing seat area as cab be seen in photo below regarding F3, the only photo i have is the prototype however the cnc version should have 6mm square cut outs to clear the top longerons yet to be glued here on the right hand side identified by the black line i hope that helps a bit for you. Linds
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hi jeff bit of a hitec man so HS85MG would always be my personal preference but i am sure there are others equal to them in truth but you tend to stick with what you know to be reliable and also what is on the worshop shelf at the time i find. I must get round to the Highside Extreme Plan at some point, much more aggressive design with fully symetrical section and big movements all good fun. Linds
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In the original as i was using stock sheet in the workshop and simply my own process of doing things, shaping the leading edge and then overlapping the sheeting would be my normal route however fitting the leading edge then butt gluing the sheet before blending works just as well and you should have no issues or strength implications. Highside has a tough old wing. Linds
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Yes as Kc states cg is right on the main spar either side of the fuselage. Interestingly just started on the design for the next Amelia Earheart design in an Lockheed Electra at circa 1.5m span. Linds
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Permission to join in please, my Kyosho Spit 90, went from this to this all due to the diligence of fitting a new rx battery and it dropping a cell during 2nd flight of the day, the wing is in a similar state. the idea is to repair and improve the scale outline without affecting the great flying characteristics. I had repainted the model in the colours of my uncles Spitfire so has a bit of a sentimental link to it also. Linds
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