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rrobut
 Post subject: Wing Profile
PostPosted: Fri Jan 11, 2019 1:41 am 
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Joined: Sat Nov 30, 2013 7:08 pm
Posts: 8
Location: Brisbane
I am a little confused.
The nose rib drawing that came with the S 18 plans shows that the profile is the 63-412 airfoil with dotted lines towards the front indicating that these lines are for the LDS-4-212 airfoil.
However the profile sheet in the plans (for the LDS-4-212) does not seem to match when I try to plot the numbers on the plan drawing.
That is assuming that station 1 on the sheet is the leading edge of the nose rib.

Thanks for the help.

Rob


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Jeff J
 Post subject: Re: Wing Profile
PostPosted: Fri Jan 11, 2019 5:03 pm 
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Joined: Wed Aug 31, 2016 8:18 am
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Location: eastern OK
Is it close enough that the scan could have gotten a little skewed and/or the paper changed size with humidity? I used to see both when I was into RC airplanes.

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James Grahn
 Post subject: Re: Wing Profile
PostPosted: Sun Jan 13, 2019 7:38 pm 
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Joined: Sat Oct 24, 2009 7:16 pm
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Location: USA
Sorry. I’ve been out of pocket for a bit.
Although I’m not sure I can answer your question anyway. The S18 should be the LDS 4-212 airfoil. The station numbers are in reference to overall station, ie prop flange. Does that help?
Cubes


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rrobut
 Post subject: Re: Wing Profile
PostPosted: Mon Jan 14, 2019 6:42 am 
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Joined: Sat Nov 30, 2013 7:08 pm
Posts: 8
Location: Brisbane
Thanks Cubes. My question is answered. At least I know which profile to use

Rob


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