Slingsby Gull scale 1/4

[sebastian92]

nice job, very technical ! i like it

[bocorvin]

Bonjour a tous,
I went on with the ribs, finally the very thin battens (1 X 1mm) had arrived and I drawed the pattern for them on the ribs with pencil




The battens are cut off after glueing with a small wire cutter, and sanded.




Now I could built the wing itself





I like the curve in the wing!

to be continued,

Vincent

[bocorvin]

Bonjour a tous,

After gluing in all the battens and vertical webs I went on with the hinges. I used the method of Vincent Besancon (sorry I don't have the French correction ) and I pre cut the ribs



so I could glue the hinges in place before cutting of the aileron. Next I tried to figure out the pulleys of the pull pull wires

and getting the angles correct. The rudderhorns on the aileron have the same throw as the on the servo. I had to create a lot of space for the wires in the ribs at the root, even I had to reinforce one rib.

planning the pull pull wires

The actuation of the spoiler came quite close to the pull pull wires of the ailerons.



The servo arm is in its most extended position when the spoiler is closed, so there is less chance of burning the servo....
Laminated tip

and the trailing edge is built up of 0.8 mm ply bottom and top, balsa in between. I laminated the balsa also in the curve of the trailing edge





I guess there is less figuring out with the other wing

Vincent

[Sed]

Perfect job as usual !

[Olli]

Hi Vincent,

very nice build

Best Regards Olli

[bocorvin]

Thanks Sed and Olli for your nice commets !

Vincent

[Mad Doc]

Hello Vincent!!!
What a beautiful model, and what a nice work!
I´m sure it will look just nice in the air!
Greetings,
Christian

[bocorvin]

Hello Chtistian, thanks for your nice comment .
In the meantime I went on with the other wing and that went indeed a lot faster! So yesterday I put it all together in the sunshine, its now raining First in the attic (It just fits)


And outside












To be continued,

Vincent.

[de Schaetzen Harold]

Prachtig! Een echte kunstwerk.

[caralp_laurent]

Wow, magnificent job Vincent !!!


Friendly


Lolo

[bocorvin]

Merci Harold et Lolo,

Thanks for your nice comments!
Hopefully it will fly nice, Each wing is 650gr at this moment

To be continued,

Vincent

[jean-jacques stannard]

Dreaming build !!!!

[Johannes]

Hallo Vincent,
Die Holzkonstruktion sieht wunderschön aus
viel zu schade diese unter einem Gewebe zu verstecken

Liebe Grüße
Johannes

[Olli]

Hi Johannes,
der Rumpf und der Nasenkasten werden aber
doch beplankt

Nice Work Vincent

Best Regards Olli

[bocorvin]

Thanks all for the encouraging comments

First I have to finish the construction of the wings, then all the pull-pull wires for the controls, than the canopy mold and then all the bits of ply. It will take some time!
Die rumpf ist vollig beplankt, die Flugel nur die nase, hier noch ein photo von das vorbild.





Vincent

[sebastian92]

Hello,
MARVELOUS
Superbe dentelle de bois !
Il doit être très léger ! tu l'a pesé en l'état ?

[bocorvin]

Hello Sebastian,

Merci pour les comments
In this state it weighs 2150 gram, I hope it will stay under 4000 gram when ready, (I hope...)

Vincent

[bocorvin]

Bonjour a tous,

Now I had to seperate the ailerons from the wings, the hinges were already glued in place


a small saw cut just opposite the hinge

(not the same rib)




A lot of sanding...

and to my great relief it fitted OK.
I wanted to build the round nose of the aileron from 0.8mm ply, so it should form a small ply "D "box to add torsion stiffness to the aileron.
Bending the ply with boiling water



drying



After some trials I made quite small panels (couldn't handle bigger ones ) glued it with thick cyano at one side

and after hardening, to the other side

clamping it firmly, its not a big radius....
Made the apertures for the hinges with a Dremel (in fact a proxxon) and joined it with a wing

it is very stiff in torsion



The trailing edge of the wing itself from a strip of ply itself still must be added, should give a small gap.
The pulleys are already waiting for the pull-pull cables....

Vincent

[sebastian92]

Hello Vincent,
let's talk in english (i hope)
we are on the same job
dont you bend before the plywood on a metal tube ? it's more easy and keep the form to glue after without forcing !
another thing ; you should put a tube in front of the hinge pin for better rotation; that's what I do for a few grm of +
good continuation !

[bocorvin]

Hello Sebastian,

Thanks for your pleasant comments .
Well, I started with bending around a tube, but pouring boiling water over the ply, while at the same time the clamps (washing pegs ) bend the ply, suited me better. So the strips are pretty well prebend. I had problems to get the ply flush glued to the 3 X 3 stringers, that why I needed the big clamps .
Maybe it was easier to take a much wider strip and cut the surplus of after gluing. (But its already finished)


It feels very rigid and I just wrote down how I fixed it, certainly there are many (good) other ways to get a proper result

Vincent

[bocorvin]

Bonjour a tous,

Actually I was a bit afraid that the pull-pull wires for the aileron actuation wouldn't work properly. I had to know if my planning worked! So I jigsawed ( ) the rudderhorns from 1mm epoxy/glass sheet, covered them with 0.8 mm ply. From 0.6 mm steel I bended loops so I could connect (and disconnect) the pull-pull wires to the rudderhorns. Put the wires through all the holes in the ribs to the servo arm and back.



I had already soldered brass tubes to the pully unit as guidance for the steering cable of the outer rudderhorns of the aileron.




So I was very relieved it worked, I can now go further with the wings



To be continued,

Vincent

[Olli]

Super Vincent

Olli

[caralp_laurent]

Hi Vincent,
Bravo !
It's superb !

Friendly,

Lolo

[ManfredNeu]

Die Anlenkung des QR und alles andere - großartig
Gruß
Manfred

[bocorvin]

Thanks Olli, Lolo and Manfred for your encouraging comments!
I was indeed very relieved the ailerons worked OK!
I went on with the fastening of the wingjoiner tubes. I liked to reinforce this part with glass tape/epoxy and filler/epoxy. Slow hardening in this case.


I left a gap between the tubes and the spar

worked wet in wet

and cut of the surplus when its partially hardened



It always looks a bit messy, but I think its strong.
After this I went on with the canopy positive. Made from 6 layers 30mm balsa, sawed to fit in the fuselage

and then cutting. planing and sanding.
Its to big to get my fingers around it...... I used rubberbands, made from inner tyres of a moped

shaped the nose also a bit more.

Vincent

[Daniel Gmür]

Wow! Nice to see, in which way your fighting for a stable but a very very non heavy Weight construction Maybe less than 50 gr/dm2 at the end? Thermal bomb! Will watch your Progress and further (metal details) with Great pleasure. Daniel

[Mad Doc]

Hi Vincent!

I really like your idea to use one servo on the ailerons, but separate the heading by cables on two places. Great, i will place this in my mind for further projects!

Greetings from Wuppertal,

Christian

[bocorvin]

Hello Daniel and Christian,
Thanks for your nice remarks
I am glad to share the building problems and solutions on this forum
Yes, I hope to get the weight below 4 kG, but I hope...

About the aileron actuation, it worried me if it should work.... The only thing I did, was making the lenghts af all the arms ( servo and both rudderhorns) exactly the same, in theory it must work and to my relief it did. I also learned a lot of all the wires of the Fokker FG 2.
http://www.retroplane.net/forum/viewtopic.php?t=4779&postdays=0&postorder=asc&start=90
The servo arm, lever, was critical, it must fit in the thickness of the wing, thats why I placed it at the root.
The beefing up of the wing joiners is because I want it to fly as a Gull with struts and also as a "cantilever Gull" without struts

Regards and LG

Vincent

[bocorvin]

Bonjour a tous,

After sanding the canopy mold fit to the fuselage, I added extra material for the vacuum moulding


This mould was too big for my equipment, luckily a modelshop in the Netherlands does the job very well


it also fitted on the fuselage




I was a bit puzzled about the seat of the pilot, the drawing was also not very clear about it ( I thought ). A couple of days ago I found the first photo of the Gull with the pilot in the cockpit.

I my mind the head of the pilot is mostly more or less flush with the rear of the canopy, but not on this picture. So I had to change quite a lot of things The servo's needed to go back quite a bit....
I put the servo for the tow release on the bottom

and the elevator and rudder on top

some figuring out.... But now there is space to put the pilot in correctly
Made the seat from a ply/balsa sandwich



to be continued

Vincent

[bocorvin]

Hello everyone,

I started to put the ply on the fuselage, Because I made the middle section of the wing separate, I had some problems to solve





Now I could glue in the central part and cover the top side.

check that all fits and is horizontal


glued in both top panels (these seams will be under the fairing)

a epoxy fillet to attach these panels firmly


Now I could do the topside of the tailboom. After making a panel fit, I put in two pins to put the panel at the proper place. Now I glue the panel with thick cyano only at the stringer

and after a minute I put on glue on the frames and other stringer and wrap the panel in place. To make the horizontal stabilizer fit to the fuselage, I had to make a balsa filler.













to be continued,

Vincent