Trewest Designs Slingsby Skylark 4

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Andrew Ray
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Trewest Designs Slingsby Skylark 4

Post by Andrew Ray » 15 Apr 2018, 09:45

I thought I would share my Skylark build as I take so much inspiration from those of you who do post your builds on here.

Not long after I started throwing models off hills a friend and I went to watch some scale comps, one we went to was at Crooke Peak and I remember seeing some of Mike Trew's designs, all to 1/5 scale. Shortly after that I ordered the plan for his Skylark 4 from Trewest Designs with the intention of building it but I decided to build the Swallow as my first scale model. The first flight of the Swallow was a disaster, not enough lift and a rearward CofG, it spun in. I rebuilt it but was scared to fly it until some years later when I was gliding at the Mynd, I took the Swallow with me and with it balancing almost at the LE it flew and flew well.

Since then I have built a few scale gliders but all of glass ships and every now and then the Skylark plan would come out.......

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Finally some 30 odd years later I have started cutting wood, but not at 1/5 scale as I am enlarging this to 1/4 scale.......scale alert!!......and fitting a hidden electric motor in the nose because it is such a great way to launch when flying solo.

So far I have cut the wing ribs the old fashioned way, the sandwich method from 1/32" balsa. The main spar on the 1/5 model is 1/4"x1/8" spruce and the centre panel utilises a secondary spar, I have increased the spruce of the main spar to 3/8"x1/8", added 1/16" webs with the grain vertical between the spruce, ply dihedral braces at the centre, carbon tows bonded to the spars and finally capped with 1/16" ply each side.

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Cliff Evans
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Re: Trewest Designs Slingsby Skylark 4

Post by Cliff Evans » 15 Apr 2018, 10:16

Hi Andrew, I hve to ask. Why scale up? there is a perfectly good plan available for a 1/4 scale Skylark 4.

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Andrew Ray
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Re: Trewest Designs Slingsby Skylark 4

Post by Andrew Ray » 15 Apr 2018, 10:46

Hi Cliff, good question. I have always wanted to build from this plan and had considered building it at 1/5 but I wanted a 1/4 scale one so by doing it this way it scratches 2 itches in one go so to speak.

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Cliff Evans
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Re: Trewest Designs Slingsby Skylark 4

Post by Cliff Evans » 15 Apr 2018, 12:02

Yes, I understand the itch thing! Been thinking the same about Mike Trews Fauvette!

roo Hawkins
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Re: Trewest Designs Slingsby Skylark 4

Post by roo Hawkins » 15 Apr 2018, 15:29

Hi Ray the skylark 4 is one I would like to build my self sometime so will be following your build so hope it all go well. what happen to mike trew and is he still flying??????????

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Andrew Ray
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Re: Trewest Designs Slingsby Skylark 4

Post by Andrew Ray » 15 Apr 2018, 16:41

Hi Roo, I don't know currently but I do remember his name popping up in the mags some years ago, at that time he had turned his hand to power scale models, that could have been 15 years ago now (or even more). I have an image of an unusual large twin engined model but nothing comes up on search engines.

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Andrew Ray
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Re: Trewest Designs Slingsby Skylark 4

Post by Andrew Ray » 26 Nov 2018, 10:56

Since starting construction in April this year not much has been achieved despite my best intentions and since then I have lost my workshop but hopefully that will be sorted before the end of the year.

After building the main spar I tackled the airbrakes, choosing to make them as per plan operated by a single servo and building them directly onto the spar before building the rest of the wing. Careful measurement and cutting of the wing ribs resulted in a fairly straightforward job. Since the picture was taken I have added the secondary spar and constructed one of the wing tips.

The trailing edge is 1/16 ply with a carbon fibre tow and 1/8 balsa, the idea is that the ply sits under the ribs, the balsa can be sanded away to blend with the ribs and the carbon will help to keep it straight.

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Barry_Cole
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Re: Trewest Designs Slingsby Skylark 4

Post by Barry_Cole » 26 Nov 2018, 13:20

To lose a glider is understandable, but to lose a workshop is just plain careless...

:shock: :shock: :shock: :shock:

BC

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