Dear All,
Thankyou for your replies, just a quick note before I go out.
Colin, rcd. thanks, will reply later when get back.
Richard, when I have the new PC set up I can do p.graphs, but not with this one sorry to say. Bought the new PC before Christmas, but there just hasn't been time to get everything transferred - but intend to do soonest as this one is getting progressively slower.
Bob, it was a non powered launch in the test tank... a huge concrete cattle trough! - 12' long, 4' wide, and 3' high. Absolutely perfect for the job! Took the opportunity to start the ballasting - even with the 6v 10Ah battery it took a lot of weight to get settled! Just a matter of melting into single shaped pieces - or sizes suitable.
Regards, Bernard