Weight & Balance 0.9
‘Weight & Balance’ is an application to assist pilots in computing the total weight and moment of their aircraft.
It allows you to define and save the constants: Empty Weight, Gross Weight, Empty Moment and seven user definable stations and their arms. After that, you would merely enter the weights at each station and the program computes the totals.
If you enter enough points (up to 100) from the “Weight and Balance” graph in your plane’s operating manual, the program can then plot that graph on your PalmPilot screen, compare the total loaded weight and the total loaded moment with the graph, and display the appropriate warning messages if the CG or gross weight limits are exceeded.
“Weight & Balance” can keep record for up to 100 airplanes.
Changes in version 0.9
Another Weight & Balance configuration exists for some light aircraft. If your aircraft’s Pilot’s Operating Handbook contains a Weight vs. C.G.(Arm) Envelope graph, then select “Weight/CG graph” from the Settings Menu.
Weight & Balance 0.9 is working correctly on Palm III devices. To use it on Palm III, please install CASLrt_pro.PRC supplied with W&B 0.9.
“Weight & Balance” was written with CASL 2.0, so if you have any other CASL application installed on your Pilot which uses older (1.0) version of CASL, please contact me before installing W&B 0.9.
If you are using W&B 0.5, please delete CASLRT and W&B from your Pilot before installing W&B 0.8.
If you have the PalmPilot Personal/Professional or Palm III, or have the Pilot 1000/5000 upgraded with the 1Mb Pro board (i.e. if you have Palm OS 2.0 or later – check installed OS with Pilot’s Memory application) then you must install CASLRT_PRO.PRC. Otherwise, install CASLRT_5K.PRC. You must also install WANDB.PRC.
To start “Weight & Balance” tap on “W&B” icon. You can also start “CASLrt” and choose among installed CASL programs.
There are five forms in W&B. When no planes are defined, the “Plane Data” form is opened first (It can be opened from the menu also). You can customize the stations to suite your plane (i.e. edit station names and arms). After clicking on the “Save” button, the details form is opened.
While you enter weights, the moments and totals are automatically recalculated, so there is no need for a “Calculate” button after version 0.5.
“Clear” button clears weight fields (except for the empty weight).
“Delete” button deletes current plane and all of its data and (if it exists) its “CG Graph Points” database.
“Save” button saves all data and returns you to the main form where you can choose another plane or define a new one.
When you are on a details form, you can select the menu option “CG Graph Points” to define the CG Graph database for the current plane. This is where you enter the moments for the forward CG limit and the aft CG limit for various weights along your plane’s envelope. Choose several points between the empty weight and gross weight, being careful to include any points where the envelope changes directions at either the forward CG limit or the aft CG limit.
The number of necessary points depends on the complexity of the graph. If the graph for your plane contains a sub-envelope for the “utility category”, do not enter these points. In most cases 5-10 points will be enough. The limit is 100 CG points for each plane. When entering moment figures, be sure to conform to the “moment/100” or “moment/1000” convention that you will choose to calculate the CG. (See “Moment/100” and “Moment/1000” below.)
After you define the graph points for your envelope, use the “Check” button (on the details form) to view the graph on your Pilot’s screen. The total calculated weight and moment is drawn as a cross. “Over gross” and “Outside envelope” warning messages are also displayed as necessary.
If no points for weight equal to or greater than “Gross weight” are defined, then a “Not enough CG points!” warning message is displayed and long horizontal line for “Gross weight” is drawn.
“Moment/100” and “Moment/1000” menu options define the way that W&B calculates moments for plane’s stations. For the first option, the formula is: Moment = Weight * Arm / 100, and for the second option the formula is: Moment = Weight * Arm / 1000.
Be sure that you enter moments for the empty weight and moments in your graph points database, that conform to the choice you make for this option. In other words, enter moments that are either divided by 100 or 1000, in accordance with the option you chose above. You cannot change this menu option after your graph points are listed, or your graph will not plot properly.
There are also three menu options to define the number of decimal places that W&B will use when rounding calculations.