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Slingsby Kirby Gull scale 1/4

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Bovin
Posts: 52
Joined: 30 Sep 2017, 12:43
Location: Hillegom

Re: Slingsby Kirby Gull scale 1/4

Post by Bovin »

Next was with the nose of the wing.
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I was a bit worried about that, there are about 12 joints in the ply covering of each wing (there is a bend in it; 4 seams). Scarf joints is very difficult to do it properly because of all curved surfaces. I build fuselages with butt plates instead, wich worked OK. In the wing it would be easier solved with thin glass/epoxy as reinforcement of the joint, instead of much thicker ply.
Here is the curvature just to be seen, a lot of very distinctive joints
Here is the curvature just to be seen, a lot of very distinctive joints
On a flat, (non sticking) surface I soaked 25mm glasstape with epoxy and let it cure. I took that off and cut it in the middle, getting strips of 12mm wide, 0.2mm thick and very flexible. I glued that with cyano an the ribs were the joint was needed. Sanded the rib first slightly down a bit (just the 0.2mm).
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The panels were prebended, using boiling water and dried for some time. I fitted both sides and left a overlap at the main spar. Glued it with thick cyano on the leading edge, put the panel on, fold it in its correct position and let that harden
The wing is held vertically just for easier gluing
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The curve in the wing consist of 4 panels
The curve in the wing consist of 4 panels
Glue only on the LE (thick cyano)
Glue only on the LE (thick cyano)
Opened up and gkue applied
Opened up and gkue applied
top side glued, bottom similar
top side glued, bottom similar
A lot of panels..
A lot of panels..
to be continued,
Vincent

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Bovin
Posts: 52
Joined: 30 Sep 2017, 12:43
Location: Hillegom

Re: Slingsby Kirby Gull scale 1/4

Post by Bovin »

The D box of the wing was now finished
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and the actuation of the ailerons had to be finished. I choose 29KG (0.5mm) flexstrand?? wire, With a jigsaw I made rudderhorns with the same throw? as the servo arm (that appeared later not being a good idea :( ) and at the arrow is a 1mm spring to secure the aileron, so I could always demount the aileron.
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,I hoped that I could reach the servo arm through the wingroot, but that appeared not feaseble, so I had to make a small latch.
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Being at work with the "cables" I finished the rudder and elevator actuation.
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I could now finish the ply covering of the fuselage, all the frames having joinerplates or buttplates, (I am not sure of the word)
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this goes easy with thickend cyano.. pressed with a batten covered with non adhering brown parceltape .
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Vincent
Last edited by Bovin on 06 May 2020, 12:06, edited 1 time in total.

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Bovin
Posts: 52
Joined: 30 Sep 2017, 12:43
Location: Hillegom

Re: Slingsby Kirby Gull scale 1/4

Post by Bovin »

It started to be a fuselage, always nice to see..
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A last view at the inside.
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I glued already some lead between the inner and outer layer.
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and put on the last panels (the making of the canopyframe comes later)
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put on pencil lines for the strips of wood and did my best to sand it so, that the wood had to bend in one direction only, For the nose I used veneer, not ply, it can be sanded witout showing the layers .
front gull 1 detail.png
front gull 1 detail.png (75.9 KiB) Viewed 277 times
I liked the different colours in the real nose!
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Vincent.

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Bovin
Posts: 52
Joined: 30 Sep 2017, 12:43
Location: Hillegom

Re: Slingsby Kirby Gull scale 1/4

Post by Bovin »

I planned to make the canopy of 0.5mm material, in hindsight maybe 1mm with a better prepared mould would have been better. First I made laminated frames (bulkheads?) and with them a wooden construction .
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. I cut the canopy glazing in 3 parts and glued that with canopy glue on the frame.
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After that 1 X 5 mm battens on the outside.
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and fitted it on the fuselage
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Vincent.

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Bovin
Posts: 52
Joined: 30 Sep 2017, 12:43
Location: Hillegom

Re: Slingsby Kirby Gull scale 1/4

Post by Bovin »

I thought putting the receiver battery in the instrumentpanel, weight nice forward and accessible. I couldn't find much info.
cockpit_gull_135.jpg
this one taken at the Museum in Edinburg.
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At this moment I could only find the instrument layout of the Petrel. Thanks to Retroplane I contacted Vince Cocket and he mailed me the correct instrument panel of the T 12 (and T 15). I let them print and made the instrument panel from some layers of 0.6mm ply.
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IMG_1771.JPG (53.34 KiB) Viewed 251 times
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and put on some details
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(altimeter zero knob) and srews made from pins
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Yes the altimeter is turned 90 degr!
Vincent

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Peter Balcombe
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Joined: 18 Mar 2015, 10:13
Location: Clevedon, North Somerset, U.K.

Re: Slingsby Kirby Gull scale 1/4

Post by Peter Balcombe »

Lovely detailed work Bovin.
It looks looks very nice indeed :)

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Bovin
Posts: 52
Joined: 30 Sep 2017, 12:43
Location: Hillegom

Re: Slingsby Kirby Gull scale 1/4

Post by Bovin »

Thanks a lot for your nice comment Peter. :)
About detailing; the Gull needs a pitot tube, I found a nice picture on this website
pitot buis ssuk.jpg
pitot buis ssuk.jpg (8.73 KiB) Viewed 239 times
a vulnerable thing with transport so I made it demountable
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fits in a square brass tube in the fuselage, with a magnet to secure it
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I made some hinges for the canopy from some scrap NS
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and a strong magnet covered with ply to close it
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Vincent.

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Bovin
Posts: 52
Joined: 30 Sep 2017, 12:43
Location: Hillegom

Re: Slingsby Kirby Gull scale 1/4

Post by Bovin »

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Before putting on the last ply panels on the wing I discovered it was a good idea to make hatches, to have accessability to the pull-pull wires of the ailerons. Try not to chip the ply
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it locks through one side bevelled and bending the hatch itself
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Made all the gusset plates
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I didn't like the optical effect of the gusset plates which lay on the ply (thats how it was in the real thing). so I took the gusset plates of the empennage off and made new flush ones
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and the wings
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Vincent.

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Bovin
Posts: 52
Joined: 30 Sep 2017, 12:43
Location: Hillegom

Re: Slingsby Kirby Gull scale 1/4

Post by Bovin »

Next in the interior is the pilot. I sculped the pilots head, again helped enormously by the tutorial of Josh Foreman

Material I use (thats Vincent Becancon idea) is Super Sculpey Living Doll, a kind of polymere clay that can be baked in a oven at 140 degr for about 30mins (instructions are on the package)
The head is basically made on a wooden stick with a clump of aluminium foil to get a reasonably thickness (les than about 10mm)of the material. After baking I pulled the stick out and milled the head further out, to reduce the weight, its now 89 grams.
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My wife loves painting, so when I just made a start with painting, she slowly took it over (I didn't mind..)
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The sunglasses are made from hard brass 0.9mm wire with the help of a wooden form and polaroid cut from an old polaroid sunglasses.I asked my sister Hans to make the clothing, look at those small buttons!
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A cap is stil in the making....
From sculpey I also made hands, reinforced with thick copper wire, which is put in the balsa arm
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ready to grip the steering collum. I went on detailing, could not buy a Sutton harnass, so from elastic band, some leather (old purse) and brass bushes (which come by servo's)
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Vincent.

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Bovin
Posts: 52
Joined: 30 Sep 2017, 12:43
Location: Hillegom

Re: Slingsby Kirby Gull scale 1/4

Post by Bovin »

Further detailling of the cockpit; canopy lock and spoiler handle
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rudder pedals
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with hinges
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dolly release handle
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completed interior
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with the pilot strapped in
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(In this picture the outside is already varnished, but its nice to complete the story of the interior)

Vincent.

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