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Schleicher K8 Built by Jilles

Let us all watch your new project progress.
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BrianF
Posts: 12
Joined: 19 Mar 2018, 09:36
Location: Brisbane AU

Re: Schleicher K8 Built by Jilles

Post by BrianF »

Got to see the finished uncovered fuselage last night, very nicely built. Looking forward to seeing it covered Jilles.
Der Himmel ist blau und die Luft ist gut!

Jilles
Posts: 198
Joined: 22 Mar 2015, 10:27
Location: Australia
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Re: Schleicher K8 Built by Jilles

Post by Jilles »

The L.H. wing is well underway a support for the TE was setup. ribs in place and top spar fitted. Between the main ribs in the D-box is just foam for the 1.5mm balsa planking support. This works form better than half ribs. Foam blocks are cut into shape with a foam cutter with the ribs as guide. Weight is not an issue compared to balsa half ribs
The TE cross section is a sandwich or 1.5mm balsa at the bottom. a chamfer 10 mm at the rear edge. a 10x0.5mm carbon strip at the rear edge, an ex 3mm balsa core and 1.5mm balsa top..Cost a bit of time but compared to the total build time not an issue
In my view it has the following advantages, the TE stay straight, it is stiff and dent proof.
pictures and TE cross section attached
Attachments
IMG_20200622_151509.jpg
IMG_20200622_151520.jpg
IMG_20200622_151542.jpg
IMG_20200622_185555.jpg
TE-SECTION.pdf
(13.85 KiB) Downloaded 26 times

Jilles
Posts: 198
Joined: 22 Mar 2015, 10:27
Location: Australia
Contact:

Re: Schleicher K8 Built by Jilles

Post by Jilles »

it has been a while but the l.h wing is now complete. After fitting the top balsa planking the wing was removed from the board and building tabs cut of from the bottom. In the NC laser kit are 9 mm balsa supports to supports the wing upside down on the building board. These are shaped to the wing top surface with 1.5mm balsa planking included There are 5 in total and they are numbered to the rib position they need to be located. These supports help to keep the wing straight when fitting the bottom balsa planking. Some weights are placed on top of the wing to keep the wing in place, These supports add a bit to the cost of the NC kit but saves a lot of time in setting up
3D printed tips sections are used. the rear edge is twisted upwards to make thing to scale.
Next is the Rh wing I will not bother you with a story on that one. All the same, just have to make sure I do built a RH wing. I heard a story that some modeler built two LH wings by mistake.
I will continue the thread when the second wing is complete. it will take a while.
Attachments
wing supports
wing supports
wing supports
wing supports
bottom planking fitted
bottom planking fitted
3D printed wing tip
3D printed wing tip
wing complete
wing complete
1.5mm plywood air brake cap strip added. top & bottom
1.5mm plywood air brake cap strip added. top & bottom

John Vella
Posts: 240
Joined: 20 Mar 2017, 22:09
Location: UK

Re: Schleicher K8 Built by Jilles

Post by John Vella »

Jiles, lovely glider but I do wonder why you foam fill the D box between the ribs ? The rippling between the nose riblets and the ribs is a feature on the full-size. The rippling on my quarter scale Charlesworth K8 0.4mm wing skins looks scale to me. Regards John.

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Cliff Evans
Posts: 227
Joined: 29 Dec 2019, 15:13
Location: Bristol
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Re: Schleicher K8 Built by Jilles

Post by Cliff Evans »

John Vella wrote:
20 Jul 2020, 09:17
Jiles, lovely glider but I do wonder why you foam fill the D box between the ribs ? The rippling between the nose riblets and the ribs is a feature on the full-size. The rippling on my quarter scale Charlesworth K8 0.4mm wing skins looks scale to me. Regards John.
Mainly to stop you putting your fingers through!!

John Vella
Posts: 240
Joined: 20 Mar 2017, 22:09
Location: UK

Re: Schleicher K8 Built by Jilles

Post by John Vella »

On that subject be very careful who you have launching (handling) your glider. Regards John.

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Cliff Evans
Posts: 227
Joined: 29 Dec 2019, 15:13
Location: Bristol
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Re: Schleicher K8 Built by Jilles

Post by Cliff Evans »

Nothing to do with that John! Just putting it together!

Jilles
Posts: 198
Joined: 22 Mar 2015, 10:27
Location: Australia
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Re: Schleicher K8 Built by Jilles

Post by Jilles »

Cliff is right on the money. Because the planking is 1.5mm balsa and the distance between ribs to scale (wide) the foam is to prevent damage by pushing fingers through and by transport. The foam is not fitted over the full length. From root to start of aileron and the last three rib bays near the tip. The balsa is not glued to the foam, only to the ribs, the foam is only for support when pressure is applied from outside. You will still see the ribs when painted.
The rippling effect is a feature of the full size but only when they get older. Schleicher made high quality gliders with a nice near perfect finish.
Over the years the rippling effect appears due to handling and varying stresses during flying.

John Vella
Posts: 240
Joined: 20 Mar 2017, 22:09
Location: UK

Re: Schleicher K8 Built by Jilles

Post by John Vella »

Jilles, now that makes it clear that the foam is just for support and not bonded to the skin, clever idea. I have done many hours in the K8 and have great regard for the glider. Regards John.

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