Been quiet a while here guys, but I would like to renew discussion on the BK117 pitch up at High AUW/DA/IAS.
Hingeless Rotors and splitpin, you say you have both experienced the pitch up, and splitpin claims it a regular occurence. What interests me here is the cruise power you are setting.
Do you cruise with TQ at 60 matched or 70 matched/top of the green?
The reason I ask is that some of the pilots I have spoken to with considerable BK time (in excess of 3000 hours) have never experienced it, and yet other pilots with far fewer hours have seen it more than once. The only obvious difference I can see that would relate to the pitch up is the TQ settings (High TQ is indicative of higher blade pitch angles and higher forward speed). The pilot's whom have experienced this were using 70% matched or top of the green. The others were using 60% matched for cruise.
To my knowledge, the flight manual, tech notes, training notes, nor checklist indicate that pilots should use any particular TQ setting for the cruise. It seems that from the original German Test pilot who recommended 60% matched, that is the convention here in Oz passed from endorsement to endorsement. Except that some people have not had that exposure, and have no written advice either, thus they are using 70%/top of the green as per every other helicopter.
Has anyone experienced this pitchup below 8000 ft DA, below 70% TQ setting or below VNE - 10kts?
Last edited by helmet fire; 13th December 2005 at 07:49.