I believe the bulletin recommended against extended operation below 2300 RPM because of some unexplained problems with the harmonic balancers getting out of sync and damaging the engine?

Others with better info?

Bob

-----Original Message-----
From: Lancair Mailing List [mailto:lml@lancaironline.net] On Behalf Of Bill Hogarty
Sent: Tuesday, August 07, 2012 7:46 AM
To: lml@lancaironline.net
Subject: [LML] Re: Recent LIVP Power Settings (Westbound, FL220, LOP, 2350 RPM)

OPPS..... Wasn't there a bulletin from TCM that said to avoid 2300 rpm?




On Aug 6, 2012, at 8:54 AM, Robert R Pastusek <rpastusek@htii.com> wrote:

> Jeff,
> I have found that you can pull the power back even more with minimal loss of speed. I suggest you do some testing down to 29"/2300 RPM and see what you get for cruise. The fuel flow will be at/below 14 GPH at these power settings (LOP and about 55% of rated power).
>
> Bob P
>
> -----Original Message-----
> From: Lancair Mailing List [mailto:lml@lancaironline.net] On Behalf Of jeffrey liegner
> Sent: Monday, August 06, 2012 7:57 AM
> To: lml@lancaironline.net
> Subject: [LML] Recent LIVP Power Settings (Westbound, FL220, LOP, 2350 RPM)
>
>
> Sent: Sunday, August 5, 2012 9:40:17 PM
> Subject: Recent LIVP Power Settings (Westbound, FL220, LOP, 2350 RPM)
>
>
> Further flight experimenting with slower prop, lower MAP and LOP at lower fuel flows.
>
>
> August 4th, Westbound FL220.
>
>
> MAP 32.0 RPM 2340 FF 16.5 gal/hour (LOP) yields TAS 246.
>
>
> In the past, at a more aggressive setting immediately after take off: MAP 34" RPM 2500 FF 19.0 though out the flight, I would show TAS ~245, roughly the same TAS. Improved prop efficiency?
>
>
> At MAP 31.5" RPM 2350, the FF is 16.2 and the performance is roughly the same.
>
>
> At this cruise setting, with a WOT RPM 2680 climb to the flight levels, the plane's range increases to six hours (rate than 5.5 hours) and still travels 1100nm in five hours on a 110gal full gas load.
>
>
> Comments welcomed.
>
>
> Jeff L
>
>
> Bonus: light winds over the Rockies
>
> http://flightaware.com/live/flight/N334P/history/20120804/1705Z/1D8/S21
>
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