J-D, as you are in the States, just pick up the bone and ring the Manufacturers,instead of expecting everyone here to do your `wondering` for you. I`m sure it makes us all `wonder` what you are taking in your `Wheaties`. Get down the library,search `Google`,go to the Smithsonian...You are acting like some of the `Yoof` who come on the training websites with ATPL/CPL/PPL questions,and expect everyone to give them all the answers...! after those 38 questions ,you`ll then be `wondering` some more,I`ll bet... If you are a serious researcher,as opposed to a `Walt` then you should know that you`ll gain more satisfactory results if you`ve done it yourself...anyway, most pilots could`nt give a `hoot` about `best L/D ratios...`you jest get it on and go fly...`