[quote="Battson"][quote="mtv"]
Any time you're communicating with someone other than ATC, you should use the "White and red Cub is midfield left downwind for runway 3 at Dog Hollow." If I'm anywhere near that airport, I know precisely where to look and what to look for. [/quote]
That doesn't sound like such a good idea. I assume experts have spent a long time figuring this stuff out, and they've had decades to refine it...
If I can see the 'white and red striped cub' clearly, I don't need a radio call to know he's downwind. I can see him already. You aren't supposed to see the N-number, it's just unique name.
At my home airport and the one next door, there are two fleets of identical trainers, all white with stripes, about 20 aircraft perhaps. If everyone said "white striped aircraft downwind #3" and "white striped aircraft crosswind #5" that would not be very helpful. The unique name is important.
I don't walk into a bar and say "hey white woman, skinny, mid-20's"
Besides, "white and red striped cub is downwind..." is more words to say than "5-Mike-Victor is downwind..."
Weren't we talking about not cluttering the airwaves to start with??
Just keeping it real here.

[/quote]
What difference does it make ASSUMING that they all ACCURATELY report their position if you can tell one from the other? If one says "I'm midfield left downwind and my engine just failed, I'm guessing you SHOULD be able to figure this out.
I spent seven years at an uncontrolled field not far from the University of North Dakota. They have green and white planes (and we used their planes as well) and they used the "Sioux" call sign (their nickname is the Fighting Sioux) as in "Sioux 34 is left downwind". There are something over 120 of those green airplanes around there, and we often had three or five in our pattern at once. We used type and color, with precise location and it worked better than many of them, who half the time were a couple miles outside the actual pattern.
Go to Santa Paula, CA. Small but very busy airport, in a canyon. All the folks based there use type and color, and it works fine.
If it gives you a warm fuzzy, use you number, but frankly, I can separate traffic calls audibly easy enough to know which red and white cub is on the radio.
But, again, the PURPOSE of communicating your position is to let other pilots know where you are. So they can find you and avoid hitting you. You don't need a tail number to accomplish that, assuming the position reports are accurate.
The same could be said for color and type, except those are useful in ensuring you're looking at the right plane. A tail number is not useful in that context.
And, if you've got two planes reporting midfield left downwind for the same runway, tail numbers aren't going to help there either.
MTV