Did you mean to say the numbers in the POH don’t make sense to you, and you’re not sure how they arrived at them? “Errors”…a little presumptive?
My experience (SR20), which I have observed is fairly typical, is that I run about 5 knots slower than the POH at 75% power, running ROP; about 11.5 GPH. LOP operations slows another 4 knots, and brings fuel consumption to about 9 GPH. I’ve heard that the cowl on the new SR20 slows things down a bit, although it has other significant advantages.
My “capabilities” spreadsheet, available on this site, has inputs for assumptions plus or minus POH performance.
Andy
Did you mean to say the numbers in the POH don’t make sense to you, and you’re not sure how they arrived at them? “Errors”…a little presumptive?
Perhaps you could explain the numbers for me. Tell me how the numbers for the 55% power endurance at 8000 feet were derived. Please explain how when you multiply and divide you get a number different from the rest of the world without it being an error. Tell me how you can lean from best power to best economy without losing speed. While you are at it tell me how you can do climb for 30 minutes at 14 knots below best rate of climb when section 4 of the POH specifies normal climbs should be 10 knots above best rate and climbs below should only be of short duration.
I can’t, nor do I plan to try. The fact that I can’t doesn’t mean they’re wrong.
My point is that you conclude that if it doesn’t make sense to you, it must be incorrect. Must be nice to be that smart.