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Re: Slingsby T.50 Skylark 4

Posted: 16 Oct 2018, 12:11
by B Sharp
Thanks Vince. Actually my choice of 1/5 scale has made things a little more difficult. I am finding that producing fine detail with my sausage fingers is trickier than with 1/4 or 1/3.5.
Brian :?

Re: Slingsby T.50 Skylark 4

Posted: 16 Oct 2018, 12:27
by chris williams
You'll forget all that when the time comes to carry her up the hill! ΨΨΨΨΨ

Re: Slingsby T.50 Skylark 4

Posted: 16 Oct 2018, 14:39
by Barry_Cole
Don't you have a Minimoa to spray slow setting paint on?????

:ugeek: :ugeek: :ugeek:

BC

Re: Slingsby T.50 Skylark 4

Posted: 16 Oct 2018, 17:13
by B Sharp
Spot On Chris.

Re: Slingsby T.50 Skylark 4

Posted: 23 Oct 2018, 20:03
by B Sharp
I needed a little break from balsa bashing so I covered the finished tailplane, elevator and rudder. The tailplane and elevator were covered in “Profilm” white while the rudder was covered in “Glosstex” white. These have now been hinged with “Robart” hinge points. :)

In the last day or so I have started building the wing centre section panels, starting on the right. As I said at the beginning of this thread Mike used a wing section which is not unlike the full size NACA63-620 which works out at 22% thick on the plan. I felt that using this would give a fairly narrow performance envelope so I am changing it to HQ3.5/16 at the root transitioning to HQ3.5/14 on the centre section. The tips will transition further to HQ2.5/12 at the wing tip. The upper surface of HQ3.5/16 is fairly close to that on Mikes plan is considerably shallower. Because of this I have had to make adjustments to the plywood joiners at the centre. All of the ribs and spars occupy the same positions on the plan but everything which has a “depth” function has had to be modified. :)

Hey Ho! One of my builds wouldn’t be one of my builds without a few mods here and there. :D
Brian.

Re: Slingsby T.50 Skylark 4

Posted: 30 Oct 2018, 10:31
by B Sharp
The internal structure has now been completed for the whole centre section. All dihedral braces, webs, joiner tubes and strengthening braces have been fitted.
I am presently debating whether to sheet this structure now or will I build the wing tip sections onto the centre so that everything can be properly aligned before sheeting.

Re: Slingsby T.50 Skylark 4

Posted: 30 Oct 2018, 10:50
by RobbieB
Definitely tip sections first Brian - or at least just part sheet, bottom only perhaps.

Re: Slingsby T.50 Skylark 4

Posted: 31 Oct 2018, 14:55
by B Sharp
I clearly forgot the old adage that you should check everything twice before cutting when I started building the wing. I fitted the centre section to the fuselage and found that the mounting area on the fuselage is shorter that the finished wing chord by about 1/8 inch (7mm).
I checked the wing plan and then the fuselage plan and elevation and each has a different measurement. B****r!!!!! (Translation: Oh Golly Gosh) :oops:
I cannot change the wing chord! I cannot move the former at the rear of the wing seat backwards! I can only shorten the cockpit area slightly to make room for the leading edge!!!!! :x :x :x :x :x
So I have had to pull apart the freshly finished cockpit frame and shorten by 7mm then fill in the gaps at the rear! :evil:
Not Happy! :( :( :( :( :(
Brian.

Re: Slingsby T.50 Skylark 4

Posted: 31 Oct 2018, 15:53
by VinceC
Don't worry Brian, that sorts the men from the boys

Re: Slingsby T.50 Skylark 4

Posted: 02 Nov 2018, 12:16
by B Sharp
After much deliberation I decided to shorten the cockpit area and also the canopy frame by just over 1/8 inch. A piece of 1/8 hard balsa sheet was glued to the rear of cockpit bulkhead and shaped. The canopy frame was disassembled and rebuilt to fit the altered space. Of course this meant alterations to the side frames, the back frame and of course the magnet catches. So after 24 hours I have returned to where I was 24 hours ago – but now the wing will fit!
Brian. :)