Why would you use the delay on the gy611?

[Maxists The Baddist]

And why the two different types of delays?

[woodturner]

Extract from an excellent 611 reference, web link below.

D1IA - This delay function will relieve a little stress from this area

D1DA - This will slow down the harshness when suddenly moving the rudder stick back to center to stop the tail rotor motion

http://www.nigelbrown.com.au/gyro_611.htm