Yes, thanks I got them. I thought I'd post them on here if OK with you. Or you can! The first one you sent shows how a zap cat would have climbed a similar wave! /forums/images/graemlins/shocked.gif
A quick aside. A certain lady VHF person has ordered a set of the Silva's this morning /forums/images/graemlins/grin.gif I used them for the first time on Sunday and they are so student friendly. I've requested an S15 to be adapted as well, I'll link it in series. I'm also sourcing some T pieces which will allow all the sets to be linked!
Post away mate I have done similar in IRB and flipped (ouch)
I spoke to I think the same VHF Lady and mentioned the Silvas .I have had a quick play and I think they will be the preffered choice for students in ease of use . I am very impressed with them so far and thank you for putting me on to them .
I shall buy you a pint next time we meet