About this Video

• Video Title: Mooney M20E Performance Test
• Channel: Frugal Mooney
• Speakers: Frugal Mooney
• Duration: 18:55

Introduction

This video documents a performance test of a 1964 Mooney M20E airplane at various altitudes. The pilot aims to demonstrate the aircraft's performance characteristics, including airspeed and fuel efficiency, at different altitudes and power settings. He also discusses modifications to the aircraft and explains the functionality of the power boost door.

Key Takeaways

• Aircraft Specifications: The video features a 1964 Mooney M20E with a stock IO-360 A1A engine, similar to those in Piper Arrows. The aircraft has modifications including a 201-style cowl, 201 windshield, and power boost door.
• Performance Data: Performance data is collected at 2500 feet, 4500 feet, 6500 feet, and 7500 feet. The data includes indicated airspeed, true airspeed, fuel flow, cylinder head temperature, and outside air temperature. True airspeed increases with altitude at the same power setting.
• Fuel Efficiency: The pilot highlights the aircraft's fuel efficiency, achieving speeds around 150 knots with fuel consumption around 8-10 gallons per hour at higher altitudes. He emphasizes the trade-off between speed and fuel consumption.
• Power Boost Door: The pilot explains the function and usage rules for the power boost door, which bypasses the air filter to increase manifold pressure and airspeed. He notes that it's used above clouds and in smooth air to avoid ingesting dust or bugs.
• Mooney Myths: The video concludes with a teaser for a future video addressing common myths and misconceptions about Mooney aircraft.

The video presents performance results at four altitudes (2500, 4500, 6500, and 7500 feet). At each altitude, the pilot records indicated airspeed, true airspeed (calculated), fuel flow, cylinder head temperature, and outside air temperature. Specific numbers vary at each altitude and are presented visually on screen during the video. A key finding is that true airspeed generally increases with altitude at a consistent power setting, while fuel efficiency also improves at higher altitudes. With the power boost engaged at 7500 feet, the pilot achieves a true airspeed of approximately 159 knots. The pilot also notes achieving a top true airspeed of 161.2 knots on a previous flight at a similar configuration. Note that exact numbers need to be referenced from the video itself due to the limitations of the provided transcript.

The video presents performance data at four altitudes: 2500, 4500, 6500, and 7500 feet. At each altitude, the pilot provides readings for indicated airspeed, true airspeed (calculated using a calculator mentioned in the video), fuel flow (gallons per hour), cylinder head temperature, and outside air temperature. The exact numerical results for each parameter at each altitude are not explicitly listed in the transcript; they are shown visually in the video itself.

Key observations from the presented data include:

• Increased True Airspeed with Altitude: As altitude increased, true airspeed also increased, even while maintaining a relatively consistent power setting (23 inches of manifold pressure).
• Improved Fuel Efficiency at Higher Altitudes: Fuel flow decreased at higher altitudes.
• Impact of Power Boost: Opening the power boost door at 7500 feet resulted in an increase in manifold pressure (from 21.9 to 23.1 inches) and a consequent increase in true airspeed (to approximately 159 knots). A previous flight in a similar configuration reached a maximum true airspeed of 161.2 knots.

To obtain the precise numerical results, you must refer to the video itself, as the transcript only provides a qualitative summary of the findings.

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