Thorp Air Command - T18.net

Supporting Owners, Builders and Pilots of the Thorp T-18 and its variants.
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James Grahn
 Post subject: Re: Droptank experience?
PostPosted: Thu Aug 10, 2017 9:29 am 
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Good points to be aware of. I don't know. It would have to be specifically engineered. I can tell you the spin resistance would be less, not sure about the structure.
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leewwalton
 Post subject: Re: Droptank experience?
PostPosted: Thu Aug 10, 2017 9:33 am 
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comment -- [One thing that crossed my mind was the addition of at least 30 lbs or more weight placed at the extreme end of the spar. What does that additional weight, maybe more importantly, the additional moment may due to the fatigue and/or G loading of the wing? Maybe it is of no concern, but the original design by an aerodynamic and structural engineer John Thorp or Lu Sunderland I do not believe included that weight and moment acting through the spar and the connection.]

Tip tanks on a Thorp are just a bad idea - don't do it!

comment -- [On the other hand, wet wings were not contemplated either and yet that is accepted. I do not know what engineering calcs if any were done for wet wings. However the weight of the fuel is distributed over the entire D-section, rather than concentrated at the tip.]

They were not originally considered as the standard Thorp does not need any additional fuel .. that being said when Don Taylor needed to fly around the world wet wings were considered and analysed .. the biggest impact is on gross weight. Those figures are available (g-loading and respective gross weights)

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fytrplt
 Post subject: Re: Droptank experience?
PostPosted: Thu Aug 10, 2017 10:01 am 
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Taxiing is the issue. Wings support themselves in flight.

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