Mike Noel wrote:
: Does the best ROC indicated airspeed change with the engine and prop
: upgrade? If it did and you are flying the old numbers, perhaps that is
: affecting your performance.

: Regards,
: Mike.

Nope... it didn't change with the upgrade. A -180C POH is what was included with the engine upgrade (performed by the previous
owner 15 years ago, BTW), and that's what I'm following.

Again though... it's not just aerodynamic results that indicate low power, although there are plenty of those:
- ROC of ~500-600fpm at my max of 2200#. A stock -180 at 2400# is listed as 750... at 200lbs MORE weight
- Takeoff run probably ~20% longer than the book values... again at 2200#
- Top speed is about 8 mph less than book value (corrected for DA)
- WOT RPM at top speed is about 150 RPM below the book "max speed" curve.

The static RPM is also consistent with being probably 10-20 HP less than 180. Oh, and before anyone asks, I've checked the
tachometer for accuracy with a strobe, and overhauled/calibrated the ASI and VSI, and have no leaks in the pitot or static system.

Cheers,
-Cory




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************************************************** ***********************
* Cory Papenfuss, Ph.D. Electrical Engineering, PPSEL-IA *
* Research Associate, Vibrations and Acoustics Laboratory *
* Mechanical Engineering *
* Virginia Polytechnic Institute and State University *
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