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ULF-1 uses mostly pine (Kiefernholz)

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ULF

Well-Known Member
Joined
Oct 24, 2015
Messages
58
Location
Vienna , Austria
Hi, Just received the plans for the ultralight glider ULF-1, and as was to be expected, most of the spar and cap stripes are pine wood.
Now this is rather uncommon for the rest of the worlds homebuilts, they all use spruce or fir.
The planes call for a certain specific weight for the spars: no more than 0,55g/cm³ and a strain braking strength of over 100 N/ cm².
What would you recommend?, Buy spruce spars from aircraft spruce?
I read through AC 43- 13 a little bit, it says sandpaper is prohibited on spars. Is this true?
Thanks :)
Johannes
 
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