For those that may be interested in the formulas for Turn radius based on speed and bank angle. I answered an earlier post but it did not come to the head of the forum for some reason.Presume you are in an aircraft conducting a circling approach at 100 kias at an airport with a field elevation of 2,500 feet MSL, and maintaining a constant standard-rate turn, you will be flying a circle which is 1.05nm in diameter. Example on the numbers:KTAS=IAS*(1+(.02*ALTITUDE IN FEET/1000))KTAS=105D=KTAS/100D=1.05 NMBA=Bank angleBA=TAS*.15orBA=((TAS*.10) + (TAS*.10)/2)Presume you are flying at 140 kts21=140*.15or14=(TAS*.10)7=14/221=7+14This information comes from an article in AVWEB from Joseph E. (Jeb) BurnsideHope this helps. Have funRegards,Cliff ScottAAL415MiamiPrivate PilotCherokee 180

Hi, Cliff. Here is something that may be easier to remember.Your TAS is increasing about 2% per 1K feet, this may not be needed for small values.To approximate you Bank Angle take you Airspeed/10 and add 5 to it, 90Kias/10=9 +5=14Another one that I use for GS of 3 Deg Descent rate, Airspeed x 5. 100 Kias x5= 500 FPM, no wind. TV