Slingsby T.50 Skylark 4

Post by **Cliff Evans** » 01 Mar 2019, 15:27

Another masterpiece Brian.

B Sharp · Post by **B Sharp** » 01 Mar 2019, 16:59

Thanks, but not so fast Cliff.
I had another look at the calculated C/G locations and was a little concerned that they were located a bit further aft than I expected. I checked the advertised location on the plan and that worked out at 25% of the root chord. (a bit too far forward for my liking) I then calculated the 15% static margin C/G position and that worked out at 39% of the root chord. (a bit too aft for my liking) I have now opted to go for a 33.3% root chord C/G position and work from there.
This is the second time that my C/G calculation softwear has given me a C/G location which is too far aft for reasonable stability. The last time was on my MU28 glider and that made for a very exciting first flight. I know I have flown gliders in the past with the C/G back at 40% - 43% root chord but these were competition thermal soarers which are a very different animal to a scale glider. Experience tells me that 33% is a safe starting point and I can work the C/G back (or forward) from there.
Brian.

Post by **Cliff Evans** » 01 Mar 2019, 17:13

You will be fine!

Post by **Andrew Ray** » 01 Mar 2019, 17:51

Crikey, I haven't been on here for a while and shocked to see I have missed the build, I need to go back to the beginning and catch up!

Beautiful job Brian, of one of my favourite gliders.

Post by **StephenB** » 01 Mar 2019, 18:33

Looks lovely Brian, finish and build are immaculate. Looking forward to the update on her maiden.

What have you used for the pilot?

B Sharp · Post by **B Sharp** » 01 Mar 2019, 18:45

Thanks guys!
Stephen, the pilot is a Hobbyking 1/4 scale Piper Cub pilot. Scaled at 1/4 the full size pilot would be 5ft 2in, but scaled at 1/5 the full size pilot would be 6ft 2in tall. So this is a cheap pilot figure that works for many aircraft.
Brian.

Post by **Barry_Cole** » 01 Mar 2019, 19:26

Brian,
Could you give us a link to that pilot, or the SKU number.

Thanks. BC

B Sharp · Post by **B Sharp** » 01 Mar 2019, 19:39

Sorry guys, that was a bit of misinformation. The company is Hanger 9 and the details are (J-3 Cub 1:4 Scale Full Body Posable Pilot
Brand: Hangar 9 Part Number: HAN4566 £14.09 Web Price.) It appears to be out of stock at present.

Further to the Skylark: it weighs in at 7lb 5oz (3.34kg) which give it a wing loading of 16.6 oz/ft2 Much easier to carry up the hill!
I will post further info once I have chucked it off a hill - however the forecast for the next week is a bit iffy up here.
Brian

Post by **Barry_Cole** » 01 Mar 2019, 20:41

Discontinued, B****r

BC

Post by **StephenB** » 01 Mar 2019, 21:44

A canny buy that Brian

Meanwhile for the rest of us, the search for a sensible money pilot figure continues .................

Scale Soaring UK

Slingsby T.50 Skylark 4

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Re: Slingsby T.50 Skylark 4