Thorp Air Command - T18.net

Supporting Owners, Builders and Pilots of the Thorp T-18 and its variants.
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Jeff J
PostPosted: Tue Jul 14, 2020 6:50 pm 
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Joined: Wed Aug 31, 2016 8:18 am
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Location: eastern OK
On mine, the wing leading edge is the datum.

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Thorp T18
O-320-B3B (160 HP)
68x74 Sterba Propeller

"The joke in aviation is, 'If you want to make a million, you'd better start with £10m.' " -Bruce Dickinson


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James Grahn
PostPosted: Tue Jul 14, 2020 6:57 pm 
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Joined: Sat Oct 24, 2009 7:16 pm
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Location: USA
You can make the datum whatever you like. The plans have it at the crank flange.
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Jeff J
PostPosted: Thu Jul 16, 2020 6:34 am 
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Joined: Wed Aug 31, 2016 8:18 am
Posts: 527
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Location: eastern OK
I haven’t seen that particular drawing. Mine was in front of the spinner when I got it. I like points that are fixed and easy to measure from like many factory built airplanes use so I moved the datum when I put it on the scales a few years back.

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Thorp T18
O-320-B3B (160 HP)
68x74 Sterba Propeller

"The joke in aviation is, 'If you want to make a million, you'd better start with £10m.' " -Bruce Dickinson


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