Gliders > Scale

Slingsby Skylark 2

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Ron:
That's really looking good Alan  :D  :clap:

But one question.
Why did you decide to change the aerofoil, and how did you decide on HQ 3.5?
OK, two questions :oops:

Ron

Alan_Perse:
Hi Ron,
The HQ 3.5 Aerofoil series is the one that Chris Williams uses on his models, apparently they are supposed to give good performance. The reason I decided to redesign the wing was because after I cut out some of the ribs that are marked on the plan for the tip panel I found that some of them did not fit, which was a little annoying, also a waste of time and balsa. I also wanted to practice using my CAD drawing skills so I decided I would redesign the wings.
I'm using HQ 3.5/14 (14% thick) for the center section and HQ 3.5/14 tapering to HQ 3.5/12 (12% thick) for the outer wing panels.

Ron:
Hi Alan,
That's interesting :?:
I have the plans for a Skylark 1, by Keith Humber, and there's no indication of what aerofoil he used.
The original used NACA 63 on the centre section and NACA 64 on the tips.
And I assume the plans don't use the original aerofoil.

I know people like Chris Williams use various 'model' oriented aerofoils, but I've often wondered if the flying characteristics may be more like the original by using the original aerofoils.

Ron

billscottni:
At smaller scales full size airfoils don't usually work. it's all to do with Reynolds numbers.

As Alan says Chris Wiliams advocates the Quabeck sections even in his 1/3 scale aircraft

Alan_Perse:
As far as I know the aerofoils used on full size gliders don't work very well on models, but I think there are exceptions.

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