I am trying to finish a Chris Williams Petrel. Being British, the plans call for the rectangular steel bar/brass tube set-up for the spars. There are 2 for the wings. I'm sure there is enough strength in the vertical load but does anyone have any experience with these in the lateral loads from towing? I don't want to go thru all the work to build this and have it fail-like my Reiher



. If I need to change the set-up now is the time to decide before I build the wings. Thanks-Bill






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