Sorry, Hesham and all, but the XBLR-3 drawing is NOT, in fact, the XBLR-3. Rather, it is a not-bad 3-view of the Material Division Design 320.
Lloyd Jones is aware that the 3-view is not correct and we have talked about it at a bit of length. In fact, many years after his book was published he came across a side view from the Sikorsky Archives. This is good as the Sikorsky Archives seem to have almost nothing on the project - or else it has been filed under some very obscure heading and is almost impossible to find. I have redrawn the Sikorsky original for my next book so will not post it here. Sorry.
AlanG