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Scratch built Slingsby King Kite 1/4**

Let us all watch your new project progress.
Mike F
Posts: 96
Joined: 18 Mar 2015, 14:08
Location: Gloucestershire

Re: Scratch built Slingsby King Kite 1/4

Post by Mike F »

Hi Vincent

Thank you for your highly detailed build log with great photos and explanations of your building techniques.

Much appreciated!

Mike F
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Bovin
Posts: 113
Joined: 30 Sep 2017, 12:43
Location: Hillegom

Re: Scratch built Slingsby King Kite 1/4

Post by Bovin »

Thanks Peter and Mike for your kind words!
I also learned a lot from all the info on this and related sites or fora, for example the PVA with a foil iron technique, so I am glad to do something in return. (my parents used to be teachers ...)

Vincent
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Bovin
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Location: Hillegom

Re: Scratch built Slingsby King Kite 1/4

Post by Bovin »

The wings are completely sheeted. Again a lot of panels, glued with the same technique, dried PVA and fixed with a foil iron.
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I have some doubts how that sticks to the balsa ribs, I think I should apply 2X PVA on them, now that the wing is still “open ”, I can apply some extra glue, but when the top goes on, that will no longer be possible. As I got closer to the wingtip, I found that an extra pivot point for the aileron was needed. First drilled an oversized hole and then glued an epoxy bearing plate to the rib.
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With a long batten with sanding paper I sanded the edge of the sheeting straight .
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The sheeted wings look very strong!

Vincent
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Bovin
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Joined: 30 Sep 2017, 12:43
Location: Hillegom

Re: Scratch built Slingsby King Kite 1/4

Post by Bovin »

I now sheeted the topside of the wing, pre-priming the balsa ribs with PVA, that seems to work better.
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Next I had to trim the back of the sheeting for the ailerons and flaps. By the way, I had already done that with the bottom sheeting before applying the top sheeting. I did this by drilling a few 1mm pilot holes with the hinge pins as guidance and cutting the plywood along these holes. Of course there was still a lot of sanding. When the top of the wings were sheeted, I just repeated the process.
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The ailerons and flaps remain demountable, just like that of the horizontal stabilizer
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I plugged in the leads and to my relief it all worked.
The wings are now roughly finished weigh 936 and 942 grams.
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Vincent
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SedB
Posts: 95
Joined: 14 Nov 2019, 09:17
Location: Netherlands

Re: Scratch built Slingsby King Kite 1/4

Post by SedB »

A very nice build so far, I enjoy to see is all come together!
The wings look great, I wonder how you achieved so little difference in weight between the two? Did you weight them in between, or is this the result of working precise?

Daniel
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Bovin
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Location: Hillegom

Re: Scratch built Slingsby King Kite 1/4

Post by Bovin »

Thank you for your nice comments and yes I am also looking forward to see it as a whole (I had a small preview :) ).
The weight of the wings is purely a coincidence, what helped that not much balsa is used, ply for sheeting, spruce for spars? only the ribs are from balsa, but it was selected balsa, all medium.
I found it difficult working with balsa ribs and the spruce, sanding is very tricky, but I am very pleased that the wings didn't turn out heavy.

Vincent
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Bovin
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Re: Scratch built Slingsby King Kite 1/4

Post by Bovin »

In the real glider there is a gap between fuselage and wing to get to the connecting gear.
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This gap is covered with a curved strip of plywood
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I tried to replicate this. The wing of my model slides over the square glass epoxy wing connector and is secured with a nylon M3 bolt in plywood lips on the fuselage and wing.
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I made a constructing aid consisting of 2 ribs (equivalent to the root rib). On this I clamped plywood with two rows of 3mm holes. On the inside I put first 2mm balsa and another strip of plywood.
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Holding the inner plywood in place with my fingers, I ran thin cyano through the holes on the balsa. I made a nose piece
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and also an upper and lower piece up to the TE. Then I glued the three pieces together, and cut it lengthwise forming the two filler pieces. I glued magnets to the rear to secure it .
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,
This piece now fits exactly in the gap and I glued 5mm wider strips on top, that fit just over the wing and fairing on the fuselage. You slide it over the wing
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and click the magnets
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To my relief It suddenly formed a visual unit with the fuselage.
Vincent
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Bovin
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Location: Hillegom

Re: Scratch built Slingsby King Kite 1/4

Post by Bovin »

It was time for the interior, first the pilot
The pilot is very visible, nice to make proper job of it. My sister wanted to make the clothes, but then I must have a figure first. I used my own measurements (a bit photoshopped....) and made the parts from 10mm balsa
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In the elbows and knees I fitted Hobart hinges,
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the hips and shoulders I fixed with shockcord
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In this way you get a figure that can be positioned naturally.
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To attach the balsa boots I have glued a piece of M2 threaded rod in, which fits into a plastic tube (control tube stuff) in the lower leg. A small bend in the M2 wire provides some friction, just bend it carefully a little. The hands will come with 1mm copper wire in the arms and the head with 10mm beech dowel in the chest. Hands, feet and head remain removable, much easier to get him into his clothes.
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In the meantime I started with the head, made of sculpey (a kind of clay-like plastic, which is baked at 140gr). This tutorial gives a wonderful explanation, but it is a time consuming job


I start with beech dowel of 10mm, wrap aluminium foil around it (the head may not be solid, it might crack when baking) and then I build the head from layers sculpey
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It takes me a while, but it's nice work and it starts to look like something (I hope a pilot...)
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Vincent
Phill Tadman
Posts: 453
Joined: 18 Aug 2015, 20:38
Location: South Cambs

Re: Scratch built Slingsby King Kite 1/4

Post by Phill Tadman »

Fantastic work!
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Bovin
Posts: 113
Joined: 30 Sep 2017, 12:43
Location: Hillegom

Re: Scratch built Slingsby King Kite 1/4

Post by Bovin »

Thanks for your nice words Phil, it is also a remarkable glider, nice to work at it!

Vincent
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