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3 Answers

Cessna 172SP ROC and GPH during climb

Asked by: 4801 views Aircraft Systems

I can't find in the POH/PIM what the GPH is for a climb? Also, how do you determine that? 

 

How do you determine the ROC using the two different charts?

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3 Answers



  1. KDS on Sep 08, 2018

    See page 5-18.

    http://aeroatlanta.com/docs/aero-atlanta-c172sp-poh.pdf

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  2. patrickpernell on Sep 08, 2018

    I got that part, but what I am wondering is if Cessna publishes or uses a specific GPH for the climb or do they just give us the amount used.

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  3. KDS on Sep 09, 2018

    The GPH will change as altitude changes. You can work that table backwards to get an idea of the numbers. I took the data for a climb from sea level to 6,000′ and the data for a climb from 6,000′ to 12,000′. For the lower climb I came up with a fuel burn rate of 13.2 GPH and for the higher climb I came up with 9.33 GPH. (Please check my math.) There is certainly a precision error in there even if my math is perfect because the table only lists integer minutes. However, it illustrates that the climb burn rate is not a linear function.

    The pilot’s goal should be to plan the fuel burn for the flight. For that purpose, the table should be used.

    This isn’t part of your question, but I’d feel remiss if I didn’t add this. Be conservative in your planning estimates. Very conservative. I once flew with a fellow who had owned the same airplane for years. He bet me how much fuel it would use after a cross-country flight. He said he could hit the number within a half-gallon, and he was right. He had lots of experience in that particular airplane. When you take a rental Cessna 172 from an FBO, you’re getting a machine that used to come very close to the numbers in the manual when it was new, but it’s no longer new. A rental pilot won’t know how close it comes to those book figures until after the flight.

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