what means ..."radi I lead"...?

[Flyingkag]

Hi all,

in an encounter report, the following sentence is given:

..." I gave him two short bursts allowing "one and one half radi I lead", and observed strikes on the fuselage...

What dose it mean? This expression comes several times, but I don't understand its sense.

Thanks for help!

Flyingkag.

[lingodog]

The calibration graticule on the gunsight, to enable deflection shooting at a turning opponent.

[Ruy Horta]

radius, radii (plural)

Imagine the "typical" ring graticule

center is 0 rad
center to border of "ring" is 1 rad

1/2 rad is half that distance

So leading by 1 1/2 radii would place the target 1/2 rad outside the reticle.

From the time before gyro stabilized, lead computing (let alone radar ranging) gun sights.

[Flyingkag]

Hi, thank you very much for the explainations; its 'clear now!

Flyingkag