Fenestron & NOTAR experiments

[AS.12]

S-58T

Fan-in-tail ( ~ fenestron ) and fan-in-tailcone ( NOTAR ) experiments.

www.dtic.mil/get-tr-doc/pdf?AD=AD0729860

See pages 55 - 58 for the schematics of the modifications.

Interesting side-note that the standard TwinPac S-58T suffered 51.55 hp less at the rotor-head than the R1820-powered donor.