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-2- also failed. In each case these failures were due principally to poor installation. (G) Between Trepassey and Horta, the center oil tank which is flat sided began to open along the baffle plate seams. This leak around the rivets increased continually until the end of the trip. This is a common occurence with flat sided riveted tanks and therefore was not peculiar to the N-C-4. (H) At Trepassey the metal tipping of the three tractor Olmstead Propellers cracked at a point about one fourth the distance from the tip to the hub on compression side and had to be removed. At Halifax the pusher Olmstead had been replaced for the same reason. The crack was due to the localization of a continuous vibration. The oak Paragons and the Lan Pusher, which replaced these propellers, were in good condition at the end of the trip and proved very conclusively that oak was an ideal wood when working in spray or rain. (I) Between Trepassey and Horta, the semi-rotary hand pump for the auxilliary water was removed and replaced by a standard type bilge pump. The trouble with this type pump has already been touched on. (J) Between Halifax and Trepassey and again between Ponta Delgade and Lisbon the aluminum feed pipe from the gasoline pump to teh gravity tank split. This was due partly to vibration and partly to excessive pressure caused by the one cylinder pump. (K) Between Lisbon and the Mondego river a leak started in one of the cylinder water jackets. This was repaired by pumping in a can of radiator antileak into the water system. None of the rotary gasoline gauges worked well enough at any time to be used,, and all readings were made from the gauge glass. The gasoline feed pipes to the port and starboard engine were air-bound after every over-night stop. This was due to the position of the strainer between the cylinders making an inverted syphon in the line. Vents had been specified but they were never installed. In conclusion it can be stated that no major trouble developed during the entire trip except in the case of the oil failure at Chatham which was really the result of a minor trouble. The N-C-4 had never been flown sufficiently to find out such things as are peculiar to each individual machine, as these had to be found out during the trip together with making all the small minor -2-
