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SZD30 Pirat

Let us all watch your new project progress.
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RobbieB
Posts: 437
Joined: 07 Mar 2015, 22:22
Location: North West
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Re: SZD30 Pirat

Post by RobbieB » 16 Feb 2019, 17:07

The balsa planking might be an issue but not convinced. My Skylark is 0.8mm ply back at the main wing former with the fuz covered in Diatex and glassed internally.

Not clogging the thread up John, all interesting stuff.

Richard Farrer
Posts: 15
Joined: 07 Oct 2015, 21:32
Location: Whiteshill, Stroud

Re: SZD30 Pirat

Post by Richard Farrer » 16 Feb 2019, 18:49

This is all interesting stuff. Thanks everyone for joining in. I have done as suggested and drawn the camber line of the Pirat aerofoil and attached two photos. I don't know if the camber is defined as the maximum distance that the camber line deviates from the chord line but if it is then this aerofoil has 2.7% camber.
The next thing I did was to measure the decalage with my amazing incidence meter and surprise, surprise with the tailplane at zero I have 2 degrees incidence on the wing. Built to the plan which shows 5.5 degrees; it must be my inaccurate building. Photos show incidence meter in place on tailplane and the wing. Checked it twice same result.The wing is a snug fit on the fuselage so I am happy with that. I will fix the wing with the locating tongue at the back and two nylon bolts at maximum wing thickness.
This exercise required first assembly of model so I had to include pics of that.
Attachments
P2160011.JPG
Incidence
P2160013.JPG
Incidence
2019-02-16 14.26.13.jpg

Richard Farrer
Posts: 15
Joined: 07 Oct 2015, 21:32
Location: Whiteshill, Stroud

Re: SZD30 Pirat

Post by Richard Farrer » 16 Feb 2019, 18:53

Some photos didn't upload so try again.
Attachments
2019-02-15 14.29.41.jpg

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RobbieB
Posts: 437
Joined: 07 Mar 2015, 22:22
Location: North West
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Re: SZD30 Pirat

Post by RobbieB » 16 Feb 2019, 22:53

Richard,

A cautionary note about incidence gauges - or more precisely, the mounting mechanisms for them.

Unless the LE of the wing is fully symmetrical about the chord line, which it is only with a symmetrical section, and most are not, you can have some inaccuracy in your measurement when using a 90º cut-out in the mounting frame on the gauge.

IMG_0054.JPG

I do like that inclinometer for the phone - must have a look at that.

Richard Farrer
Posts: 15
Joined: 07 Oct 2015, 21:32
Location: Whiteshill, Stroud

Re: SZD30 Pirat

Post by Richard Farrer » 19 Feb 2019, 10:27

Another good point, I hadn't thought about that one. Quick check and, phew, all Ok with this wing section.
IMG_20190219_101342885.jpg

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