I want to make a pitch and power table for C172s based on calculation, just like I attached above.
I picked up this table on internet, but I'm not sure where it comes from.
Do you have any ideas how to get these values?
I got the answer from cessna company, as below.
The pitch/power table you have provided is not a product of Textron Aviation and has been developed outside of our flight testing and engineering. We have no formula available for calculating required pitch attitudes, The table shown appears to be developed by a flight school based on actual flight test observations.
In general terms, pitch relates to angle of attack. Angle of attack required for certain climb and descent rates are dependent on variables such as gross weight, C.G. location and indicated airspeed. In relation to the quote “pitch + power = performance”, a more accurate approach for developing a quick reference chart assuming the aircraft gross weight and C.G. remains constant is to match indicated airspeed with power settings. Pitch + power can approximate an airspeed, but more accurately power + airspeed = pitch. Flying an aircraft “by the numbers” relies on power settings and airspeeds, which consequently will produce a certain pitch attitude. Conversely, to facilitate a desired climb or descent rate we set power and approximate a pitch attitude to arrive at the desired airspeed.
The interrelation between pitch and airspeed is for the most part interchangeable, but most accurate is thinking of pitch attitude being a consequential product of power and airspeed in the context of normal flight maneuvers.
Well, nothing new here. But I found that there are no exact formula to deal with power and pitch table. I'll try to collect actual data.
Thank you guys.
When you are flying you will be looking at airspeed. Pitch, throttle setting (and trim) will depend on this and whether you are climbing, descending, or in level flight. Data can be gained from experience, or one can go on a flight dedicated to gathering this information all at once. Fill in the blanks one at a time!
A chart such as this could be a useful part of the POH in the event of an emergency, such a malfunction of the airspeed indicator.
A scenario pointed out in comments would be a pitot tube icing event. Rpm settings for pitch would be useful for maintaining straight and level flight, giving valuable time for problem solving. Possible solutions mentioned were use of GPS to get ground speed, then land into the wind so airspeed at least is as much or more than ground speed. Also on the list would be to ask ground radar for your speed and fly a straight in landing pattern factoring in the wind.
But under normal conditions, your eyes belong either out the window or on your instruments.