If often wished for a fine nibbed pen that writes indelibly on paper, but can be rubbed off a laminated surface. I use a chinagraph on my chart fairly regularly in-flight, and a fine ballpoint on my flight log, and I'm fed up of having to swap between the two.
Any chance you could invent such a pen? It may have a much bigger market outside aviation.
I've also had another idea (along the same lines) that I feel would be more of a "design" problem, and hence fit better with your brief. Send me an e-mail if you are interested in discussing this other idea.
Good luck
[ 28 February 2002: Message edited by: tacpot ]</p>