The tightening mechanism according to throttle valve closure was modified and adjusted in OS 32F motor, by scraping the tip of needle valve to the oblique direction, the fuel flow at high speed would not be suffered from the special mechanism of the carburetor. This counteraction would establish the normal and smooth transition throttle connection from middle speed to hi speed under YS fuel pressure injection system. The same modification was also done on 25LA motor with 2B carburetor having tightening mechanism.
As my intention is to come back to F3A field as a contest flyer, I must make effort to carry out the speculation in a year.
Regaining the intuitions as a F3A competitor is not an easy task for me after 30 years of absence blanking, training myself and preparing the competition model airplane are the indispensable things to be achieved for the purpose. Now comes the interesting things would happen in future?
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