Rock, This topic came up several years ago. Bob Pastusek had posted his numbers. They looked much better. I suspect it is tied to differences in governed rpm. For a while Lancair was selling governors that had a very restricted rpm range. posted by Bob back in June 2011 My IV-P has a glide ratio (at...

I suspect the propeller rpm is still quite high even-though the control is pulled all the way out. I would have expected a glide ratio between 15 and 20 on the IV.

What was the propeller rpm? The prop is a huge drag source, the lower the rpm, the lower the drag. In some cases the lowest rpm limited by design, in other cases it is an adjustment issue.

The plenum/diffuser set-up won't fit an original cowling. The inlets are set back too far (relative to the spinner) among other things.

What is the nature of the damage? That will help answer the repair/replace question.
Have any pics?

What was the fluid level? Normally the damper is always submerged. If fluid level gets low, it can pull in some air.

Hope the strut tube didn’t also get bent.

I am far from an aerodynamicist, but my observations are the MT blades nearly always have a substantially thicker airfoil profile. In comparison, the 5 blade composite Hartzell on Evos and Epics is actually thinner than the metal alternative. Those composite props are also the most efficient props ...

Tom, Is there enough of a sample size to break down the non-fatals by cause and see any trends? I was involved in the review of all 2-seat Lancair accidents a few years ago. You had everything from not qualified/shouldn't be flying to not being aware of required maintenance to flying with known defi...

I wonder if putting this prop on would do that trick? You would need more area. These things are sized for the application. Power and speed combinations. This prop is cut down for ground clearance. Actually, it was cut down several times and tested at each increment. I have the shortest version. Ad...

I have data logger onboard that captures various engine compartment temps for thermal calculations. It starts recording when the master is turned on and stops when the master is turned off. For kicks, I pushed the plane into the hangar and let the recorder run for an extra hour. What you can see is ...