ylhelico.
Can I ask what operations you carry out?
I'm just intrigued by your reasoning with regards to confined areas & submerging your tail.
On a personal note I've never had to go in a confined area small enough that my tail rotor was at risk & I certainly have never had my tail rotor threatened by water.
However interesting reading. Have always wondered ref. Notar vs Tail Rotors (After all I've encountered tail rotor problems!
)
Does the above info. have any relevance to the 900's & 902 aswell?
For the record, I still fly conventional machines & have yet to get my grubby mits on a NOTAR!