Fuel supply

Not a few modifications were operated on Rookie 10 small trainer airplane yesterday. First of all, carburation has completely changed from normal aspiration to YS fuel pressure injection system, this is operated under a special device with diaphragm regulated and primary crank case pressure supplying into the fuel tank. Although, this one had been kept as one my juely for as long as 40 years. The carburetor should have fuel measuring system at idling speed, this is one of an indispensable requirement for YS fuel injection system. Trial running on a test bench showed reliable performance to be used on actual flight. The biggest advantage of well controlled fuel pressure system is that, operative condition does not change in any attitude of the airplane keeping decided amount of fuel injection, up & down, spin and avaranches with no anxiety of motor stop if the adjustment was adequate enough, but not difficult.
The injection system consist with a regulator, a pressure outlet nipple, an one way valve and micro mesh fuel strainer, very simple construction.
The regulator was positioned at just the nose gear portion outside because of shallow mounting space.
Over powered OS 25LA on Rooky10 is operated under a half throttle condition on ordinary flight and the full power is used only when it comes up while maneuver, so mechanical dumping stopper was invented on the transmitter stick portion, very simple as it is, so works well, the convenience of this modification would be realized if tried actually.