Dave, that web page is getting interesting! Have you got the rest of that XH-59 document?
Jack, thanks for clearing up the confusion. With an overrun clutch allowing autorotation i can now understand an Nr of 88%. I imagine that the J60s did not produce much thrust at low speeds, so that the PT6s actually generated most of the "airplane" thrust (through the rotor). So you were using the collective to trim for level flight (or climb/descent) as the speed increased/decreased? Was there a particular speed where you found you were retrimming the collective more regularly?
CEFOSKEY, do tell! Has the bird made a hop yet, or did it just go light on the gear?
Last edited by Graviman; 20th Aug 2008 at 11:22.