57. Tutorial - Creating an Aircraft Performance Profile¶
This tutorial shows how to automatically collect aircraft performance while flying and how to create, merge and fine tune the result.
You should be already familiar with the flight planning features of Little Navmap.
57.1. Flight Plan¶
You can use the flight plan from the IFR tutorial is included in the
Little Navmap directory:
.../Little Navmap/etc/Tutorial IFR Bembridge (EGHJ) to Wick (EGPC).pln.
Use main menu
File -> Open Flight Plan to
load the flight plan.
The plan should cover the typical cruise altitude and travel distance for your aircraft. A short hop of a few miles at low altitude does not suffice.
You can also fly and collect performance without a flight plan. Set the intended cruise altitude in the window Flight Planning to allow Little Navmap to detect the cruise phase.
57.2. Aircraft Performance¶
First start by creating a new and empty performance profile by selecting
Aircraft -> New Aircraft Performance
in the main menu.
Leave all as is in the dialog and click
Ignore the various warnings and error messages in the fuel report for now. This performance profile is good enough to calculate top of climb and top of descent with a three degree flight path angle.
Also ignore the zero values in the Fuel Plan Section. Fuel flow data has to be entered in the performance profile to get a valid fuel prediction.
Start and load a flight with aircraft engines running or not. Connect Little Navmap to the simulator.
Flight -> Reset all for a new Flight in the menu. Remove the check mark from
Create a new and empty flight plan since a plan is already loaded.
OK to get a clean base for fuel calculation, logbook and other
Fly and use typical climb and cruise performance settings in the aircraft. Time compression is no issue if you stay a few minutes at cruise to allow Little Navmap collecting cruise fuel data.
You can see the detected aircraft type, detected flight phase (climb,
cruise and more) as well as all current values collected and averaged by
Little Navmap in the tab
See chapter Aircraft Performance Collection for details.
New flight phases are added when detected. Note that the cruise phase is only detected when flying at flight plan cruise altitude. Set the cruise altitude in the flight plan tab at least if you wish to collect performance without a flight plan.
After landing and shutting off engines you can see the text
Current flight segment: Destination Parking, Finished. in the tab
You have a complete aircraft performance collection once the text
Finished. is shown which is right after touchdown at the
Aircraft -> Merge collected Aircraft Performance
in the main menu to fill the
empty performance profile with the collected values.
Note the header
New Value (collected data) and
(currently loaded or created profile default values) with the values
We’d like to use all values for the new profile. Therefore, set all
Copy in the dialog and click
You can also change the operations for each field individually or use
Merge which will use the average of the new and
current value. You can do a merge at any flight phase. For example, if
you’d like to fine tune the values during flight.
See Aircraft Performance Merge for more.
Adjust the performance using
Merge when doing more flights after the first one.
Do not forget to add at least sufficient reserve fuel. Otherwise you will run out of fuel at destination if you rely on this plan.
You should change the usable fuel and values for alternate after
merging. Do this by selecting
Edit Aircraft Performance . Note that
required values have bold labels in the edit dialog.
It is also helpful to add notes like engine power settings in the description file of a performance profile.
Example below for a Beech King Air C-90:
The chapter Aircraft Performance Edit explains details about editing.
Use performance files for different cruise altitude ranges to get more precise results for large or complex aircraft. For example, one file for FL300-FL350 and one for FL350-FL400.
Aircraft -> Save Aircraft Performance and save the new performance file to any place like
Documents\Little Navmap\Performance, for example.
Think about sharing this file with others or send it to me so I can add it to the download section of littlenavmap.org.