First post, thank you for your hospitality. Eventually I will probably manage to drive the calculations using the C-172 POH into my thick head but I am struggling; math is my weakness. Does anyone know of either a computerised process for calculating these numbers (there's no such category in Sporty's E6B for iPhone) or a really good step-by-step explanation, online or in a document, for the mathematically challenged? I am struggling a bit with the process. Many thanks.