This thread has had lots of accurate formulas and calculations submitted. Here is another one. This time it is an excel calculator for radius of turn. Not too sure if it can serve any one's practical needs. If you find any mistake, let me know and I will fix it.
Download file through your browser
The following two rule of thumbs from this thread, I found, are easy to use.
Originally Posted by Artisan
For a rate one turn, use a Bank Angle of =(TAS/10)+7 (Degrees)
Originally Posted by Jetpipe.
The 1%*GS*½ is the best rule of thumb ever for RATE 1 turns up to 250kts so thats what I m keeping from this thread.