PPRuNe Forums - Pitch Attitude in Percent Instead of Degrees

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They flew too nose high, too low on fuel.

It's just a math problem to find what low fuel level and performance would cause the problem.

It's a math/science problem, not a flight attitude.

Quote:

Originally Posted by albatross (Post 11881440)

Good question. Why indeed?

Not a joke but feel free to laugh at me.

Now if and that’s a big IF what is being referred to is that 100% of Pitch up or down is 90 degrees then what % of 100 is 6.3 degrees?
So IF 90 degrees = 100% 1 degree is 100/90 or 1.111% so 6.3 degrees is 6.3 x1.111 should equal 6.999 % .( pretty darn close to 7 degrees of pitch)

That works for small angles. Percent slope as a fixed multiplier of angle (rule of thumb stuff). But it starts to break down above 5 or 10 degrees. The trig functions are not linear.

Percent slope may be useful for rate of climb. But even if someone's instruments are all marked in percent slope (doubtful), you can't add percent slopes (Flight path angle + AoA to get Pitch Attitude). You can add angles in degrees precisely.

Quote:

Link to the site below.

https://www.mountainpassessouthafric...d=449&catid=48

Please, no. That table is just confusing.

I have never heard of % used in relations to pitch.
Degrees of pitch is used and on the Airbus Flight Path Angle (FPA).
% is used for climb gradients.
For mental exercise and as a rule of thumb I use 3% as a reference.
The groundspeed I divide by 3 and then multiply by 10.
For instance of a groundspeed of 240 knots, 800 fpm is required. 240/3 = 80 x 10 = 800
For 6,6% gradient 800 x 2,2 or 800 x 2 plus 10%..

Unfortunately I am not allowed to post the table (URL) until I have posted 8 posts.

Climb gradient 3%, Feet per NM 182, 120 kts GS 400 fpm, 180 kts GS 600 fpm, 240 kts GS 800 fpm.