Here we have finally zoomed in far enough to condemn the simple idea of round tubes butted together that looked Ok for an overall of the airframe. The tubes have sqaure ends and are trimmed so they meet at lines in corners or y's. There are stainless steel plates at every joint that have fingers and are not just triangular or square. The fasteners are round headed hollow rivets maybe like a pop rivet. The angles of the stainless steel plates are radiused. Soon we will have to decide if there will be yellow or orange flames coming out of the stacks. Some photos show deflectors so pilots did not look at them and be blinded in the night. That goes with the story of aviation 115/135 gasoline that had slow burning toluene in it to prevent knocking from detonation. It also goes with water and alcohol anti-detonation (ADI) fluid injection and Stromberg carburetors. Smoke even! Here we can ask how fast does elastic strength propagate? At the speed of sound? We are going to go 325 mph about half the speed of sound in air at sealevel. Will the steel and alloy weaken? Sound speed in metal is higher. How high? How do they interact as panels buzz and power strokes and jerks of the propellor propagate down the airframe? When does the bearing shell on the crank rod journal know that the sparkplug has fired and the gasoline exploded as the flame propagates across the cylinder and a pressure wave builds up to continue the piston back down the bore demanding the piston pin tell the connecting rod to back off and drive the crank around? How much flame goes out the exhaust port as the exhaust valve opens after top dead center and the rpm is at 3000 and the initial charge pressure at 15 inches of Mercury guage? In the beginning, the engines burned pure hexane for tests. Then they got to 87 octane. With only 6:1 compression ratio and low superchargeer pressure they could run on that. In the beginning in 1935. The flames were still blue-white. You could drill pin holes in the exhaust stacks and set the mixture by looking at the color. Does it bother you his right foot is going through the rudder pedal? He is "frozen" in Carrara I have to look more closely in Poser too to send him over for this posture and zoom. How about those smaller tubes sticking up that don't seem to quite meet at a joint? I haven't butted all the tubes and put on all the plates in the forward truss yet which those are a part of. We probably will never make this view again so the image is finished. It's part of the archive of building.