Formula For Climb Gradient
Is there a formula for calculating Climb Gradient's ?
At least get you in the ball park for determining your FPM on climb out. I got the Pt. 23 and 25 info. just would like to see how you are all figuring this Climb Grad. out. If DP calls for a certain Alt. climb per. NM. until reaching a specified Alt. Or if it calls for a certain Climb Grad. in % ( like 3.2%) assume you know what your ground speed will be. Do you need to look at Jepp. chart (gradient chart) or is there another way. I apologize if this has been said before. I'm new to site and you guys have lots of great answers. |
Try this-
Ft per NM divided by 6000 times 100, this will give you the Climb Gradient.. 500 ----- X 100 = .0833333 X 100 = 8.33% Climb Gradient 6000 500' = Ft per NM 6000' = How many feet in a NM ( I believe its 6032' per NM, I just round it off ) |
Rise over Run x 100
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Originally Posted by jetjockee
(Post 440043)
Try this-
Ft per NM divided by 6000 times 100, this will give you the Climb Gradient.. 500 ----- X 100 = .0833333 X 100 = 8.33% Climb Gradient 6000 500' = Ft per NM 6000' = How many feet in a NM ( I believe its 6032' per NM, I just round it off ) So looks like you are multiplying by what the GS will be. That will get you the FPM. Thanks for the answer, got me to think about it. |
Originally Posted by OmahaPilot
(Post 440148)
Rise over Run x 100
This appears to be a nice easy formula. Can you give an example? Or if you have a min. climb of 500' per nm to 1500' and your GS is 150kts. how would you calculate? Thank you. |
Originally Posted by Cheyenne Driver
(Post 440175)
This appears to be a nice easy formula. Can you give an example?
Or if you have a min. climb of 500' per nm to 1500' and your GS is 150kts. how would you calculate? Thank you. 500/6076x100= 8.23% Take your gradient times your groundspeed to get a climb rate in feet per minute 8.23x150= 1235 feet per minute |
This is a good site with lots of info: Aviation Rules of Thumb - Flightsim Aviation Zone - Number 1 Flight Simulation & Aviation Resource! - Flight Simulator, Aviation Databases
Gives many memory items that are helpful. |
Nice link! You get a gold star IMHO. Thanks!
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Another way you can do it is to take 500 feet per nm multiplied by your speed in nm per minute. 150kts is 2.5 nm per min.
500' per nm X 2.5nm per min = 1250' per min. Don't forget that for larger climbs, your true airspeed will increase even though your calibrated/indicated speed remains constant. TAS can be computed from Indicated Airspeed (IAS). TAS increases over IAS at the rate of 2 percent per 1,000 feet altitude increase. So, use the equation: TAS = IAS + (2% per 1,000 feet) (IAS) Here's a nice resource available to anybody and I highly recommend it. http://www.e-publishing.af.mil There is a search function in the upper right. Type in "11-217" without the quotes. Make sure you have publications selected then click search. This returns two hits. Select 11-217V2 (V1 is all the boring stuff USAF folks must comply with), go to page 69 in V2. It's a great explanation of the 60-to-1 Rule and has a bunch of formulas. Skyward80 |
Thanks guys. Got it figured out. Just getting some of the possible tech. questions answered (studying).
CD |
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