MODIFIED MGB MOUNTING PLATE ON TRANSMISSION SUPPORT PLATFORM OF CHEETAH/CHEETAL HELICOPTER

摘要

Earlier design cracks were occurring at the 5R radius location due to the local resonant vibrations which leads to fatigue failure. To eliminate the stress raiser occurring at the location, a hew design deleting the radius and strengthening the local area, was made. It is seen from the stress report that there is a reduction in stress concentration factor (Kt) from 1.76 to 1.0 i.e stress reduction for one side is 76%. The new modified MGB Mounting Plate (P/n 2-28009) eliminates the formation of cracks near 5R radius and center fastening hole of the bell crank support.