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Slingsby King Kite 1/4
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bocorvin
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MessagePosté le: 12/11/2020 13:48    Sujet du message: Slingsby King Kite 1/4 Répondre en citant

Bonjour a tous,

Malheuresement mon Francais est pas tres bonne, I'll do the building story in English, sorry,
Its almost winter again and it started to itch, what should I build? Whilst building the Slingsby Gull, I had the opportunaty to read the book “ Slingsby Sailplanes ” by Martin Simons, writing about the development of all the Slingsby gliders. There was a wonderful story about the Slingsby King Kite T- 9. This was a innovative design from 1936/37 with the aim of participating in a major international competition at the Wasserkuppe in July 1937. It was said that gliding would become Olympic. This glider was equipped with flaps and built to be able to fly fast. Because there was little time 3 prototypes were built simultaneously. During the test flights , the aircraft unfortunately turned out to be extremely sensitive to spins . As an emergency measure, all kinds of enlarged vertical stabilizers were built and with such an enlarged vertical stabilizer he finally flew and did reasonably well. Afterwards it turned out that there was a mistake in the building of the wings. Which mistake has never become completely clear, but what I understand is that the wing twisting was not well built (in all 3!) And that the center of gravity was quite far back. It is a wonderful story , it can also be found on the SSUK website : articles / rise and fall ., wonderful to read!
https://scalesoaring.co.uk/slingsby-the-rise-and-fall/
Because this glider was covered with plywood (I like that), was quite innovative and had good flying pqualities, I decided to build it in 1: 4 scale. The wingspan will be 3875mm and I hope to keep the weight below 4.4 KG


There are very few pictures of the real thing





Now the making, a different story. I grew up with pencil and drawing board and now I wanted to draw this glider digitally. I bought the drawing programs Devwing and Devfus4, just affordable . It took me quite some time to learn to work with it, but gradually I managed to do useful things sometimes with frustration, but in the end gave me a lot of satisfaction.

I also had a problem what to use as wingjoiner. After breaking the carbon 8mm round wingjoiner (it was designed for a steel rod, which is has it now) of my Nemere 1/6, 330cm wingspan and with some warnings on the Retroplane forum, I had my reservations about carbon wing joiners . A steel wing pin is quite heavy and I really wanted to keep the weight down. Due to the gull wing there is quite a bit of dihedral in the middle part of the wing , which did not make it any easier.
On the Dutch modelbouw forum and on Retroplane, I stumbled in an excel sheet with wing spar and wing joiner calculations. That was nice, I'm educated in Kilogrammes , later Newtons and finally Mpa's , and I was afraid to make a mistake by a factor of 10 or something. With this program I could calculate the wing spar and also a wingjoiner.
http://voiletech.free.fr/Modelismeplaneur/calcul_longeron.htm



I realized that if I made a wing joiner of UD glass/epoxy myself I could make it with dihedral built in . This means , moreover, that the wing joiner could only be held in place by the (reinforced) skin of the fuselage, a tube is not possible because of the built-in V . I bought 20 X 20mm square aluminum tube which will fit nicely between the 20 X 4 mm upper and lower girder of the main spar of the wing. Now I had to make a 17 X 17mm square glass rod which would fit into this square tube . I thought let's try to make that. From spruce battens and a board (covered with packing tape to get a non sticking surface) glued together with hotglue, I made a simple mold.







I took four pieces of UD glass tape, 7.5cm wide (600gr / m). Impregnated that with epoxy resin and the folded lengthwise twice double (4 thick) , placed on the bottom of the mold, and after that the two upright sides in a similar way. In between those upright impregnated tapes,I first put 2mm balsa strips of 11mm, each against one side and then I put 1mm balsa strips between the other balsa strips to get the impregnated glass in place without touching it. Thereafter the last double folded layer of glass on top of it, and closed it with a batten with the tape to get a flat surface. Now I got a square glass / epoxy tube with a balsa core

The wall thickness turned out to be more than 4mm, making the joiner much stronger than the wing spar , it should stand 27G according to the above calculation program. The weight of this joiner is 168 g, 60 cm long. I was glad with this experiment, now I could start the building of glider itself.

To be continued.

Vincent (DB)
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Clifton
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MessagePosté le: 12/11/2020 19:03    Sujet du message: Répondre en citant

Hello Vincent

Very good choice this glider. I have the Martin Simons book too and there are lot of beautiful gliders to build.

Nice job, as usual !

Philippe



Slingsby Petrel, à mon gout le plus beau de tous, quoi que le Fafnir ... Ah ces ailes en mouette, un jour ....

Rien de ce qui est fini n'est jamais achevé tant que tout ce qui est commencé n'est pas totalement terminé (Pierre Dac)
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MessagePosté le: 12/11/2020 22:17    Sujet du message: Répondre en citant

Merci Philippe Very Happy ,

It will be a slow project, bur I'll enjoy it!

Vincent (DB)
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MessagePosté le: 16/11/2020 10:41    Sujet du message: Répondre en citant

Dear Vincent,

I am also following your new construction with great attention.

I am suprised with your construction of a special wing steel joiner. I am afraid with the stifness of your system. Or you are going to build a very strong enclosure around?

As an alternatif I suggest a system as I used for my Reiher.
If you look at thes included picture, you shall understand. Can been build for a flat steel wing or a round one.




Met zeer vriendelijke groeten.
Harold
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MessagePosté le: 16/11/2020 14:43    Sujet du message: Répondre en citant

Dear Harold,

Thanks for your interest in this project! Wingjoiners are more difficult than I thought....
It looks like you misinterpretated how my wingjoiner was made, its made from (UD)glass/epoxy composite, not from steel.
The wingjoiner you use in the Reiher is a sound construction, but I don’t like to use it for this glider because its so flexible horizontally. Let me explain my thoughts how I came to this solution.
I prefer to place the wingjoiner between the upper and lower wingspar. That combined with the dehydral, limits the height of the wingjoiner. In this glider the pilots sits between the leading edges of the wing, so the wingjoiner has to also be strong horizontally. The square glass/epoxy is strong in both directions. Besides, because its only held in place by the (local reinforced) skin and not in a tube, it can flex a bit. That reduces the peak loads with hard landings. When a profile is put in a stiff tube it can flex much less and the peak loads can be higher.





The wingjoiner slides in a square aluminium tube which will be bonded solidly with the wingspar, so I think I have a sound solution.

Met ook zeer vriendelijke groet,

Vincent (DB)
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MessagePosté le: 25/11/2020 15:05    Sujet du message: Répondre en citant

Super projet Vincent ! [clap]
Bonne construction !

Amicalement,

Lolo



Lolométéo, rétro addict ;o)

"On commence à vieillir quand on remplace ses rêves par des regrets"
Sénèque
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MessagePosté le: 28/11/2020 17:00    Sujet du message: Répondre en citant

Hello everyone,
I thought it would be most convenient to start with the tail surfaces, I wanted to make the plans digitally, for me that is something completely completely new. I had already played around with the drawing program Devwing last summer and I started to understand a bit how that worked.



In addition, I had to try to understand how the real glider was constructed. Unfortunately, things went wrong in those two learning processes, it turned out that the horizontal stabilizer of the King Kite was more complex than I had realized. I also managed to make entire drawings disappear. Finally I managed to send the files as DXF. A good friend, Adri CNCed the ribs and I started to build the horizontal stabilizer. Because I had misinterpreted a few construction details the result were unsatisfactory. Adri suggested it was better to CNC a new set of stabilo ribs. In the meantime, I started building the vertical stabilizer.


The fin under construction, the laminated top arch is already in place, as are the hinges
I wanted the rudder itself to be easily detachable, which is convenient for storage and transport.
The top and TE of the rudder are completely curved, so I laminated the top of 3x1 spruce, bent after being poured over with boiling water and glued with thin CA.
The rear of the TE is made up 3 pieces of 0.4mm plywood, scarfed joined on both sides, filled with balsa, forming a sandwich.









right half of the py TE glued on and holes already drilled in the ribs where rudder must be detached .
The two hinge pins are made 1mm steel in 1mm epoxy/glass, so I can slide the rudder from above over these pins. It is secured with a sliding steel wire at the lowest rib


I covered the front of the rudder with curved 0.4mm plywood, together with the main spar of the rudder this becomes a light and stiff plywood tube.





the weight is about 30gr in this building stage.
With the rest of the plywood covering I wait until a later stage of the construction, first I will built the horizontal stabilizer.

To be continued,

Vincent (DB)
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MessagePosté le: 28/11/2020 17:14    Sujet du message: Répondre en citant

Hello Vincent,
we are all looking to gain a few grams Laughing
good job !
let's continue like this !



Pourvu que ça vole, roule, flotte… normalement j'ai tout bien fait pour !
Un bel avion est un avion qui vole bien ! Marcel Dassault
…………
Sebastian

Vends module émission 2.4 ghz pour Futaba, Hitec TZ-FM + 2 récepteurs corona 8 voies (contact en MP)
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MessagePosté le: 28/11/2020 19:03    Sujet du message: Répondre en citant

Hello Sebastian,

That is a good idea, Very Happy Laughing .

Vincent (DB)
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MessagePosté le: 29/11/2020 11:34    Sujet du message: Répondre en citant

Hello Vincent,

I found the list of participants, aircraft of the international competition of 1937 and the result in the book by Peter Riedel "Über sonnige Weiten" - Experienced Rhön history 1933-1939.





Attendees





Result





P.M. Watt best English pilot 12th place.


Gruß
Thomas
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MessagePosté le: 29/11/2020 14:18    Sujet du message: Répondre en citant

Hello Thomas,

Danke fur die info, dass ist schon und die Photo ist ganz gut, weil Ich keiner von das interior? habe Very Happy Very Happy Die Tuche um seiner Kopf musst doch modelliert worden, ebenso die Zigarette Laughing

Vincent (DB)
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MessagePosté le: 29/11/2020 16:42    Sujet du message: Répondre en citant

I still found some photos.

https://cevans.me/VINTAGE/Documentation/KingKite/KingKite_Docs.html

https://benitz.com/Watt/WattPercyM1906_Photos.html

Gruß
Thomas
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MessagePosté le: 29/11/2020 17:48    Sujet du message: Répondre en citant

Proficiat Vincent,

Zoals verwacht, alles goed nagedacht en gepland.
Ik verheug mij om jouw constructie van dichtbij te volgen.
Mvg.
Harold

Félicitations Vincent. Une belle et intéressante construction à suivre de très près.
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MessagePosté le: 29/11/2020 18:39    Sujet du message: Répondre en citant

Danke Thomas,
die sachen van C Evans hatte Ich bereits, aber die andere von benitz/Watt sind wieder ganz gut [amen] [amen] , es gibt so wenig dokumentation, klasse das Sie dass gefunden habe Very Happy

Beste Harold,
Dank je voor je plezierige commentaar, leuk dat je het wilt volgen!

Mvrg, LG
Vincent (DB)
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MessagePosté le: 30/11/2020 19:45    Sujet du message: Répondre en citant

I found something else.

http://www.glidingheritage.org.uk/documents/articles/slingsby_guide_v3.pdf

https://www.yumpu.com/en/document/read/46347177/sailplane-glider-1937-lakes-gliding-club

https://s3-eu-west-1.amazonaws.com/bga-sg-archive/Books/SLINGSBY++SAILPLANES.pdf


Gruß
Thomas
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