To 212MAN:
Yes ,Sikorsky built a Fantail(Fenstron)
equipped S-76B but it was only a test bed for the commanche program. Nick Lappos (Sikorsky Test Pilot) said they needed to put put a couple hundred pounds of weight in the nose to keep it within CG.I don`t think Sikorsky expected to put a Fantail S-76 into production. As a matter of fact there`s
a new "quiet" tail rotor design that`s supposed to be incorporated into the S-76 in the (near)future.At least thats what some Sikorsky people told me.
Ive seen a photo from about 1995 of a Bell 230 with a prototype "Fenstron".
Ive also seen a AS-350 with a fenstron ,
i didnt know about it till i saw a picture
(if anyone wants to see the pic let me know and ill post a link).
Finally ive heard about a Puma testing a Fenstron but havent seen a picture but i have seen a artists rendering of a Super Puma with a Fenstron.From what i understand the weight penalty and power requirements of a Fenstron in this large a helicopter is to high to be economical.