B23 Comet?
Wingco.

I think you mean "Dragon".
But well done it is the B-23.
Link -- http://www.axis-and-allies-paintworks.com/e107_plugins/forum/forum_viewtopic.php?12597.post
And the prize of course.

Thanks for the prize. Thought at first it was the D H Comet black racer, it looked sleek enough, but the de-icing boots and patrol reference meant it couldn't be. your generous clue helped but "comet" somehow stuck.

Wingco.

This weeks headache?

Have fun

Ikarus 451

Well done Jim & extremely quick, it is.
LINK -- https://en.wikipedia.org/wiki/Ikarus_451
And the prize of course.

This weeks headache ???

Have fun.

1st clue as this is a rare bird
??????? sleek all-metal racer was obviously one of the most advanced and fastest planes in the world. However, this was not enough to make the plane a success, as it suffered from constant mechanical woes.?

Crosby CR-3?

Well done Harry it is.
A very sleek looking machine IMO.
LINK- http://www.fiddlersgreen.net/models/aircraft/Crosby-CR3-Racer.html
The man himself, with the aircraft.

And the prize.