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 

that an impeller thrust bearing failure may have taken place prior to the crash, but that the shaft continued to operate against the spherical face.

Cooling provision is the only

weak spot

from

serviceability

standpoint,

a in

the writer' sopinion. Potential output is probably limited to approximately 0.5 hp. per cu. in. by this feature. A rather rough estimate places the cooling area per cylinder at

somewhat

less than

1000 sq.

in. Fig. 4

shows the

complete

aircraft designers very unhappy.

Given the cooling limitations just mentioned, it is believe that the remainder of the engine is very conservatively designed. With these removed it is probable that master- rod bearing lining cracking would soon develop, not because of excessive bearing loading, but because of flexure of the rod hub. The carburized crankpins can be expected to aid bearing performance, and the lubricating means is presumably adequate since it is used by another manufacturer with good results reported.

cylinder

assembly.

The

baffle

pressure

drop

to

keep

combustion-chamber temperatures below

the

detonation point would almost

certainly

make

American

Some of the materials used in the Kinsei engine are of interest. They indicate that, at least at the time when this engine was built, there were adequate supplies of nickel, cadmium, chromium, cobalt, copper,

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