When we looked at it (not in huge detail, 'cause we lost heart
), we came up with the following figures/schemes/solutions.
1600 ish miles in under 33 hours needs average
of 49ish Knots. Using twin petrols, in a 9metre RIB, running pretty much WOT for hours on end, is going to drink enough juice to keep OPEC happy. We "budgeted" on 2 litres/mile/engine, which is pretty much what my single 250 uses WOT
plus a little in hand. We looked at big under deck tanks and big on-deck drop tanks with big cross tank feeds and pumps to enable boat balance to be maintained, as we reasoned we would be driving the boat bloody hard and needed all the advantages we could get.
To put the weight into perspective, we (roughly) assumed that we would be using 6 tonnes of fuel. The question of re-fuelling is therefore absolutely essential as you say.
Our plan was to have made (by a well known Midlands fabricator
), a large number of deck tanks of a size that could be man handled full to minimise down time for refuelling (remember we needed a bloody good average
Say we were carrying 2,250 litres under deck, we would have needed another 4,200 litres in tanks. We allowed the maximum size that a tank could be was 150 litres, so that they could have been man handled when full. We thought we’d put 6 on deck at any one time using a system of quick disconnects and mounts plus a lot of valves and pumps! This would give us a requirement for 4 fuelling stops at 790 then every 200 miles or so. We figured to make the stops “hard” against a suitable quay/shore side to facilitate handling a tonne of fuel at a time, rather than “wet” from boat to boat as we were concerned over the logistics. The difficulty of finding “volunteer” to sit on our fuel “stashes” and handle the donkeywork was alarming, but easier than co-ordinating boats!
Even the costs for this amateur attempt, including the assistance from Shakespeare Etc, were pretty great and when someone announced a well backed venture, we decided to let it go…
Good luck to anyone
who attempts this record