Peter
Have sent PM twice tonight but they are not showing up on my 'sent' messages??? Wondering if you have received them - would like to buy lights and have them sent second class post please. Could you PM me please with your preferred method of payment, cheers Sue
Re how far away they go , and come back - the latest ones have a GPS so that if it loses the control signal from the operator, it flies itself back to the launch point and lands itself !!
Yes, you can't see any damage. I think they prefer std pipe, although chafe should not be a problem with a non-gimballed appliance.
Some other info here - http://www.hurleyownersassociation.co.uk/pages/gas.htm
Or try British Waterways, but I couldn't get their link to work.