Follow along with the video below to see how to install our site as a web app on your home screen.
Note: This feature may not be available in some browsers.
In their [FONT=arial, Arial, Helvetica]"Aircraft Performance Calculations- Methods and Myths"[/FONT] video, they address, somewhere in the 1+15 presentation, close-in obstacles and figuring your net takeoff flight path to clear them.[FONT=arial, Arial, Helvetica]Lets look at an example; an obstacle is 140 feet above the runway and 2000 feet from the runway end. The reference point above a dry runway is 35 feet (15 feet for a wet runway, effectively increasing the required gradient). Therefore, the geometric rise of 115 feet (140-35) divided by the run of 2000 feet renders a required net gradient of 5.75%. Add in the Part 135 requirement (35 feet clearance) and the resulting required net gradient is 7.0%. Assuming a twin engine jet, the required gross gradient becomes 7.8%.[/FONT]
Wait. The answer two of us gave was that it's information about the area in the departure/takeoff/maneuvering are that one might what to simply =know=. Like anything else, what one chooses to do with knowledge (including, "I really don't have to change anything") is pretty much up to them.Ok, let me change the question to this:
How about this?...the airport is KACP.The truth is that you don't change any of your IFR departure procedures based on a tree 16ft AGL, 300ft off DER, 260 to the left of the DER. I was hoping maybe I was missing something but it looks like I am not. Those close in obstacles are a waste of time and ink.
That's a line of trees, and the trees to the sides are taller...that's 233 ft/mile to lose your belly beacon. There's absolutely no way you can take off from this runway, be at your minimum of 35' over the DER, meet the minimum climb gradient of 200 ft/mile, and not hit trees.trees, 1300 ft. from runway, on centerline, 50 feet AGL/159 MSL.
For the plane I fly, a Sa-227, it is no problem clearing those trees. I did the calculations.
So did mine...but if the runway was long enough that I could carry enough fuel to go where I wanted to go without making a fuel stop, I wouldn't be able to.For the plane I fly, a Sa-227, it is no problem clearing those trees. I did the calculations.