
Hi Tony,
The wing of a racing pigeon can be of great interest, and offer some indication of it's potential, or possibly lack of. But one must be aware that a pigeon is more than just wings. It is the sum of all of it's physical parts, plus the invisible bits, like character and determination.
You could write pages and pages about wing shape, this is not the place, obviously. There is plenty of information and one source I recommend is the book Born to win, by Dr Wim Peters. Published in South Africa in 2000 it is a small goldmine of information. You might find a copy online somewhere.
Any healthy pigeon has two wings and is capable of flying. Therefore it is worth training. As jockey I learned that some of the most unlikely looking young horses turn out to be good ones. They all deserve a chance.
I have a pair of stock pigeons which produce little blue chequer white flights in every nest. They all have little short wings. Not ideal, you would say, but from one pair, the cock, 580 won a 50 mile race at the start of the season, the sister, 581, went to another loft and was first clocked from 100 miles, was first from 300 miles on a tough headwind day, then went 500 miles to be pigeon of the year in that club.
Another sister, 569, named Free Beer, went to a One Loft race and flew the program, ending in two 420 mile races two weeks apart. We were looking for head winds, but got blow homes both times, not ideal for a little hen with little wings.
Now, you would not be aiming to breed pigeons of that "type", but they are what they are, not physically perfect but loaded with determination. Last season every week one of them would pop up on a result somewhere.
There is no "perfect" wing. One type of wing will excel in a strong tail wind, another type on a head wind day. Some will win short races, others long distance. Even a pigeon with a "wrong' wing can win if it's in super health and fit.
There are all sorts of "theories", eye sign, wing theory, throat theory, and there is absolutely some merit in all of them. But I hardly look at any of them. I believe in feet sign. The one whose feet hit the landing board first is the best one.