Foreflight Glide Advisor
If you are trying to figure out your glide ratio for your individual aircraft here is a good article from Foreflight: Determining Glide Ratio for My Aircraft
The POH for the 182H shows a glide ratio of 9.1:1 but I bumped that down a bit just to make sure we were able to make it to surrounding airports based on our best angle of glide speed using the Glide Advisor area ring. The ring takes into account wind speed and surrounding terrain. Our airspeed indicator in 91X is in mph so using 80mph as our best angle of glide gave us a 69kias glide which provides us a conservative 8.5:1 ratio.
Here are some screen shots from our flights showing the differences of glide areas based on our altitudes. They always say "Altitude is a Pilot's Best Friend". This gives you some proof. Look at the available glide area when we are down low near traffic pattern altitude vs. when we are up at higher altitudes. When between Ontario and Payette at 8,500' we were almost within gliding distance of 4 different airports and near the 10mile radius ring due to the winds. When nearing traffic pattern altitude near Nampa our gliding distance is only about 2miles.
|Jim Hudson and Tad Jones test flying the 91X Backcountry plane with a new engine|