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Scratch built Slingsby King Kite 1/4

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Bovin
Posts: 104
Joined: 30 Sep 2017, 12:43
Location: Hillegom

Re: Scratch built Slingsby King Kite 1/4

Post by Bovin »

Peter,
Good to hear that. I feel the same what you mentioned in the last paragraph. It once saved a plane when the connector with the main battery failed.

Best regards, Vincent

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Bovin
Posts: 104
Joined: 30 Sep 2017, 12:43
Location: Hillegom

Re: Scratch built Slingsby King Kite 1/4

Post by Bovin »

Now I could cover the bottom of the fuselage. I came up with a sanding tool so I could clamp the panels, otherwise my fingers would get cramped
IMG_2485.JPG
A batten attached to my worktop with a screw clamp , a piece of aluminum angle and two large spring clamps. The sanding went a bit better now.
IMG_2478.JPG
. Fuselage and panel with glue
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, panel in position and secured with a hot iron. wetted with a sponge
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bent and secured. After a few days it starts to become a fuselage
IMG_2492.JPG
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. Next is the nose, lots of panels ...
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 »

The nose of the fuselage is a challenging job. It's important how the fuselage looks, so I hope to do well.
King-Kite-3.jpg
I had roughly sanded the nose into shape and I marked the strips on it with a pencil.
IMG_2470.JPG
At the connection to the cockpit cover they follow the round frame shape. Further forward, the strips flatten so that they can be bent towards the tip of the nose. There is no double bending .
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I came up with the idea to mark the strips with a small router, so you can sand some without sanding away the marking. On this picture you can see where the strips will come . Strip by strip, the nose is covered.
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For these strips I use veneer instead of ply and I glued them with thick cyano
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The result
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Now I am starting the preparations for the wings and the fairing wing/fuselage.

Vincent.

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VinceC
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Re: Scratch built Slingsby King Kite 1/4

Post by VinceC »

Nice detailed work. What glue are you using to fix the panels?

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Bovin
Posts: 104
Joined: 30 Sep 2017, 12:43
Location: Hillegom

Re: Scratch built Slingsby King Kite 1/4

Post by Bovin »

Hello Vince,
Thanks for your nice comment!
In the past I used always thick cyano, but (thanks to the very instructive video I picked up at this forum) I use PVA with heat. I will use that mostly in the wings too. The small strips on the very nose of the King Kite I did with thick cyano, the others with PVA/ ironing. I still have some doubts about the strenghts, time will learn. Its certainly less stressfull.

Vincent.

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Bovin
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Re: Scratch built Slingsby King Kite 1/4

Post by Bovin »

The wings, I started with the right one
The profile choice I found difficult, the real King Kite had a profile NACA 23021 which looked quite symmetrical. The profile and thickness determine the "looks" of the aircraft and so I ended up with HQ 2.5 with a thickness of 12% decreasing to 10 at the tip. With the flaps (and the ailerons, not prototypical) I can make more camber . With Devwing I drew the wing
vleugel.png
vleugel.png (70.03 KiB) Viewed 2025 times
My friend Adri was kind enough to mill the ribs and the web plates. The root ribs in 2mm plywood and the rest in 2.5mm medium-hard balsa.
IMG_2537.JPG
With the program “Calculdelongeron” I calculated the main spar, 24X4mm spruce on top and bottom at the root to 2x10mm at the tip. Should be able to take 10G, not including sheeting. By the way, the wing is completely sheeted with 0.6mm plywood, like the real one. I had previously made a glass / epoxy wing joiner with dihedral that fits in 20x20mm aluminum square profile. Because it has a gull wing, I made a building board with the gull angle and laminated the spars in that angle too.
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building the wing
building the wing
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Servo holder, all 4 made in one go
Servo holder, all 4 made in one go
IMG_2545.JPG (31.64 KiB) Viewed 2025 times
All the web plates glued, left open at the root. So the space between the aluminum square and the main spar can be filled with epoxy /micro balloons.
IMG_2553.JPG
IMG_2553.JPG (29.51 KiB) Viewed 2025 times
It's starting to look like a wing!
It's starting to look like a wing!
I'm going to build the other (left) wing now.

Vincent
Last edited by Bovin on 13 Mar 2021, 21:11, edited 1 time in total.

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Max Wright
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Location: Clayton Bay South Australia

Re: Scratch built Slingsby King Kite 1/4

Post by Max Wright »

This is a nice build, Vincent.

I'm learning a lot. 8-)
Max

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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 »

Hello Max,

Thanks a lot Max and I am learning also lots from all the build reports :)

Vincent

john greenfield
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Re: Scratch built Slingsby King Kite 1/4

Post by john greenfield »

Hi Bovin

Can you tell us more about the program With the program “Calculdelongeron” please? This is not a program I have heard of before but it sounds very interesting.

AEB
AEB = Aeronautical Energiser Bunny (with thanks to CW)

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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 »

Hi John,

Glad that you are interested! Funny, I found this French program on the Dutch "Modelbouiwforum" and later I also found it on the forum "Retroplane".
I am not familiar with basic computor programs, but I managed to get my values in it and get sensible results.
Calculdelongeron (bois) - king kite.xls
I get the impression that I can't send it as an attachment, so I send an PM to.

Vincent

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