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Thread: Let's talk propellers

  1. #31
    tjlebaron's Avatar
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    Default Re: Let's talk propellers

    Quote Originally Posted by Wag-builder View Post
    Oops, left out some critical information! Cruise power is 2300 RPM and 115 MPH indicated airspeed.
    Thanks! This was helpful!

  2. #32
    tjlebaron's Avatar
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    Default Re: Let's talk propellers

    Quote Originally Posted by andya View Post
    for those with apple products, there is an app by James Petty, called AircraftPower which
    runs the graphs after you put in Manifold Pressure, RPM, Altitude,Temperature.
    Neat app. I used coming home from Steve's AC to be sure I ran above 75%
    as much as possible to get good seating of the rings on the fresh ovhl
    the app covers engines from the O-235 thru many of the O-320 and O-360 engines
    Hey thanks. I just downloaded this app and it is great! Note: it is for iPad and not iPhone

  3. #33
    Brian's Avatar
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    Default Re: Let's talk propellers

    Quote Originally Posted by andya View Post
    for those with apple products, there is an app by James Petty, called AircraftPower
    Thanks for the heads up about this App Andy! Way easier than eyeballing the chart in the POH.
    Brian
    Brian
    Monrovia, CA

  4. #34
    dbudd's Avatar
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    Default Re: Let's talk propellers

    I put a 50" on my 150hp pacer to get out of my dads short strip . At 4000 ft msl it made a big difference in take off but suffered in cruise. I burn less fuel though, flatter prop less manifold pressure I guess.

  5. #35
    tjlebaron's Avatar
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    Default Re: Let's talk propellers

    A few number from today's flight with a 150 HP and 58 pitch prop. To figure airspeed I documented ground speed at three headings each 90 degrees from the other, added them together and divided by 3.

    OAT was 20 deg. Pressure altitude was 5,500 feet, MAP 2300, Tach 2500

    At 78% power, airspeed = 117 mph.

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