First test flight
Trip Start Sep 01, 2012
25Trip End Ongoing
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This flight test is necessary to test the long range fuel tanks prior to the long sea crossing. A half hour local flight to evaluate the systems was uneventfully, apart from an autopilot fluctuation which was corrected by switching off and then on again !
I now have five valves, (in addition to the original valve) to open and close according to the fuel movement required. There is no fuel transfer pump on this system.
The aircraft main tanks work as before, simply switch left and then right as required every half hour to keep the aircraft in balance.
However the new arrangement requires that I move fuel from the front auxiliary tank to either left or right wing tanks via a set of valves in the passenger floor area, supplied with the aid of gravity and outside air flow pressure from a "pitot" style intake under the front right wing, which the pilot controlles via a valve in the roof of the former passenger area. When the main tank is half full I transfer fuel until almost full, then when the front ferry tank is empty I then use the aft tank until that runs dry.
The two ferry tanks make some alarming noises when they expand and contract due to pressure changes. I intend to fly again in the next day or two to confirm that it is possible to empty completely the last remnants of fuel.