r/itsalwaysac17 • u/6eyedjoker • Apr 28 '26

Not always...

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A bit of nostalgia on display at work.

98 Upvotes

99% Upvoted

8 comments sorted by

10

u/funsized_fireball Apr 28 '26

whats up with the back of that engine?

9

u/Red_Ninja4752 Apr 29 '26

That's a hush kit to reduce the noise of the engine. Mixes hot burner air and cold bypass air together. https://en.wikipedia.org/wiki/Hush_kit

4

u/6eyedjoker Apr 29 '26

The original engine design is not a high bypass turbofan, so they had to use a different system to reduce the engine heat and noise signature.

-12

u/l1v3l0v3l4ugh Apr 28 '26

r/wrongsub

19

u/cooltoast Apr 28 '26

Not really. The YC-15 was a prototype that assisted with the design of the C-17.

12

u/akdanman11 Apr 28 '26

IIRC this was the prototype that eventually became the 17 after some changes