We recommend that people use the VP primary structure AS - IS, then do all modifying and customizing in the secondary structure. Without the required engineering background, one should not modify the primary structure which has been engineered, stressed, and now proven for over 40 years.
Because the VP primary structure is so very simple to begin with, it has been a natural for people to build upon with their own ideas.
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WHERE CAN I FIND INFORMATION ABOUT LICENSING MY VP-1?
Parts For My VP-1?
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EAA - Homebuilts
The world of homebuilt aircraft - officially known in the United States as Experimental Amateur-Built Aircraft
Metric Converter http://www.unitconverter.org/