from wikid paedia
https://en.wikipedia.org/wiki/Lockhe...Q-170_Sentinel
"The design lacks several elements common to stealth engineering, namely notched landing gear doors and sharp leading edges. It has a curved wing planform and the exhaust is not shielded by the wing.
. Aviation Week postulates that these elements suggest the designers have avoided 'highly sensitive technologies' due to the near certainty of eventual operational loss inherent with a single engine design and a desire to avoid the risk of compromising leading edge technology."
yes I know wiki can't be trusted