Try overloading your aeroplane... try unbalancing your plane... it will warn
you.
Disclaimer: This is not an approved weight, balance and endurance chart. See your POH and your flight manual for the official figures. Flight Club and Richard Dale do not accept any responsibility whatsoever for the accuracy of this spreadsheet.
For more information please contact Richard on rad@flightclub.com.au
Here is an example of the calculator in action on one of our planes (it's BIG):