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Slingsby T.50 Skylark 4

Let us all watch your new project progress.
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B Sharp
Posts: 649
Joined: 19 Mar 2015, 17:18
Location: Perthshire

Re: Slingsby T.50 Skylark 4

Post by B Sharp »

While I continue to ponder the way forward with the ailerons I decided to get the fuselage finished to the point of painting.
The glass/epoxy covering to the fuselage was rubbed down with wet and dry. Upon inspection there were a number of holes and other flaws all over the surface as well as patches of open weave. I was interested in the thread on filler elsewhere on the forum and was surprised to read that it was possible to thin P38 filler. I scraped P38 into the worst of the defects and gave then a quick sanding. I then thinned a large batch of filler, mixed in the red hardener and then painted a thin coat of filler all over the fuselage. I gave a second coat over areas which I felt it was required before the first coat set. After another session with the wet and dry I was very happy with the final finish which is now ready for primer.
I have now also added the nose skid and tail skid to the fuselage and have started to fair these into the fuselage underside.
On Mike’s plans he stipulates adding 1/64 ply covers over the wing/fuselage joint just aft of the wing mounting area. I decided to use 1/32 ply for these in the interest of durability and adjusted the shape to get a more desirable line. I have still to add a little glass cloth reinforcement to the underside of these and also to fair in the top of the joint with filler but they should be ok in operation.
Brian. :)
Attachments
The nose skid in place.
The nose skid in place.
The tail skid.
The tail skid.
Aft of wing covers being attached.
Aft of wing covers being attached.
Aft of wing covers.
Aft of wing covers.
Aft of wing covers.
Aft of wing covers.

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B Sharp
Posts: 649
Joined: 19 Mar 2015, 17:18
Location: Perthshire

Re: Slingsby T.50 Skylark 4

Post by B Sharp »

Well, I've been and gone and made up my mind on the ailerons.
Today I have carved a new aileron from a length of 2 inch by 1/2 Balsa TE stock. Once it was fully shaped I clamped one end of the built up and also the solid aileron to the bench and then applied approx. equal amounts of torsional force to each. The built up and reinforced aileron had a twist of +/- 30 degrees. Under similar pressure the solid aileron had a twist of +/- 5 degrees. Sorry folks, but that is "No Contest" to me.
On the negative side it is not a scale structure and it weighs double the built up structure. On the positive side it is less likely to flutter if I get the aeroplane going a bit fast and also at 50ft no-one will ever notice (except maybe the Scale Police).
Brian. ;) ;) :)

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B Sharp
Posts: 649
Joined: 19 Mar 2015, 17:18
Location: Perthshire

Re: Slingsby T.50 Skylark 4

Post by B Sharp »

Well, my last post was in 2018 and it is now a brand spanking (am I allowed to say that?) New Year. So I will start of by wishing you all a Very Happy New Year.
I have not been idle over the festive (falling down) season. I have completed the ailerons and covered the centre section of the wing and also the wing tip panels with white “Profilm” and snazzy coloured wing tips. I made epoxyboard horns for the ailerons and got them all hooked up with the minimum of fuss. The servo hatches were formed from 1/32 ply with a “Profilm” covering. Job Done!
My next job will be to attach the canopy glazing to the frame. This is always a fiddly job and is one I always dread, it is just so easy to make a mess.
Brian. :)
Attachments
The completed and covered wing panels.
The completed and covered wing panels.
Tip panel detail showing the servo hatches.
Tip panel detail showing the servo hatches.
Pushrod / horn detail.
Pushrod / horn detail.

Geoff Pearce
Posts: 432
Joined: 18 Mar 2015, 09:11
Location: SN11 9EE

Re: Slingsby T.50 Skylark 4

Post by Geoff Pearce »

Hey Brian I was lead to believe you didn't make a mess? :lol: :lol: :lol: :lol:

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chris williams
Posts: 1019
Joined: 10 Mar 2015, 10:50
Location: Blandford Dorset

Re: Slingsby T.50 Skylark 4

Post by chris williams »

Profilm, Brian...? Did you take out a mortgage? :D

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B Sharp
Posts: 649
Joined: 19 Mar 2015, 17:18
Location: Perthshire

Re: Slingsby T.50 Skylark 4

Post by B Sharp »

Geoff, I am very good at making a mess, I do it all the time. However I am also very, very good at clearing up afterwords.
Chris, I know that profilm is pricy but I love working with the stuff. I have tried most of the alternatives but profilm is still my favourite.
Brian :)

john greenfield
Posts: 512
Joined: 18 Mar 2015, 07:52
Contact:

Re: Slingsby T.50 Skylark 4

Post by john greenfield »

B Sharp wrote:
09 Jan 2019, 08:52
Chris, I know that profilm is pricy but I love working with the stuff. I have tried most of the alternatives but profilm is still my favourite.
Brian :)
Brian
Have you changed nationality !!!!!

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

StephenB
Posts: 117
Joined: 26 Dec 2018, 08:45
Location: Hungary

Re: Slingsby T.50 Skylark 4

Post by StephenB »

A very nice job Brian, are the ailerons simply top hinged with tape?

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B Sharp
Posts: 649
Joined: 19 Mar 2015, 17:18
Location: Perthshire

Re: Slingsby T.50 Skylark 4

Post by B Sharp »

John, no I have NOT. We Scots are famous for buying the best whiskey and the best covering material that we can afford. We are also famous for being very cautious on the price of everything else! :D :D :D

Stephen, yes, the ailerons were designed to be top hinged. I bottled out of trying to get five small pinned hinges on each aileron to line up correctly and then seal the gap. I used my favourite invisible tape to do the job instead.

Brian. :)

Nigel Argall
Posts: 124
Joined: 20 Mar 2015, 18:26
Location: Cornwall

Re: Slingsby T.50 Skylark 4

Post by Nigel Argall »

Great work Brian. Not sure if I missed this earlier but what holds those servo hatch covers shut - shock cord or something??

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