"Yeff" wrote in message
...
On 14 Dec 2003 22:18:58 GMT, BUFDRVR wrote:

I'm sure you could lump those in there as well. There has to be some
*formal*
convention where this is spelled out no?

I list them like this:

1st - canvas airframes

Nobody ever built canvas airframes, the WW1 era
aircraft used wood and wire airframes with doped linen
stretched across them

2nd - metal airframes
3rd - jet engines

So what was the DH Vampire, Generation 1 or 3 ?
It had a jet engine but not a metal airframe

4th - look-down/shoot-down radar

That lumps everything from the F-4 to F-15 into a
single generation

5th - low observables



Keith