Welcome Guest. Sign in or Signup

4 Answers

75% Power – Endurance

Asked by: 9452 views , , ,
General Aviation, Student Pilot

Dear(s):

 

What’s the meaning of 75% of power?

 

How I calculate this?

 

Best Regards,

 

Carlos

 

Ace Any FAA Written Test!
Actual FAA Questions / Free Lifetime Updates
The best explanations in the business
Fast, efficient study.
Pass Your Checkride With Confidence!
FAA Practical Test prep that reflects actual checkrides.
Any checkride: Airplane, Helicopter, Glider, etc.
Written and maintained by actual pilot examiners and master CFIs.
The World's Most Trusted eLogbook
Be Organized, Current, Professional, and Safe.
Highly customizable - for student pilots through pros.
Free Transition Service for users of other eLogs.
Our sincere thanks to pilots such as yourself who support AskACFI while helping themselves by using the awesome PC, Mac, iPhone/iPad, and Android aviation apps of our sponsors.

4 Answers



  1. BEM on Jan 15, 2013

    Good question. +1 here. How do you know when you’re at 75% power? Throttle 3/4 in? Seems rather imprecise.

    0 Votes Thumb up 0 Votes Thumb down 0 Votes



  2. Heather H on Jan 15, 2013

    You’ll need to refer to the cruise performance table in your POH for that specific aircraft, 75% (noted as BHP) can occur in a variety of situations.

    This is from a Cessna 152, as an example, 8000 Feet, Standard temperature running the engine at 2550 RPM would result in 75% power:

    http://cl.ly/image/1E1g2x3q2f0u

    +1 Votes Thumb up 2 Votes Thumb down 1 Votes



  3. Bill Trussell on Jan 15, 2013

    To more directly answer your question, 75% power is 3/4 of the power (rated as BHP or just HP) of the maximum certified output from the engine as configured on the aircraft. The data related to this is derived imperically during flight testing with speed, fuel burn and time figures (time to climb and endurance) being either tested or measured during testing.

    All this is important for flight planning and performance calculations during pre flight planning including time to climb, cruise performance, alternate availability and the like. Reference to the flight manual or POH provides you with indications of engine settings for achieving 75% power if desired, either tach or MP and Tach.

    Achieving 75% power depends on engine condition and altitude of operation

    +5 Votes Thumb up 5 Votes Thumb down 0 Votes



  4. Cadu on Jan 22, 2013

    Thak all of you guys…

    +1 Votes Thumb up 1 Votes Thumb down 0 Votes


The following terms have been auto-detected the question above and any answers or discussion provided. Click on a term to see its definition from the Dauntless Aviation JargonBuster Glossary.

Answer Question

Our sincere thanks to all who contribute constructively to this forum in answering flight training questions. If you are a flight instructor or represent a flight school / FBO offering flight instruction, you are welcome to include links to your site and related contact information as it pertains to offering local flight instruction in a specific geographic area. Additionally, direct links to FAA and related official government sources of information are welcome. However we thank you for your understanding that links to other sites or text that may be construed as explicit or implicit advertising of other business, sites, or goods/services are not permitted even if such links nominally are relevant to the question asked.