Having just returned from a substantial voyage i though some people would like a report on the Opti's fuel and oil consumption.
Tuesday was dead, dead calm all the way from the Solent to Eastbourne, we made 35-42knts all the way and fuel consumption was the highest i have ever seen it, average 0.8nm / li. We used almost exactly 100li, which is about 25% more than i expecred. Most of the time we were sitting at 5000 rpm. We also used an alarming amount of oil, about 3-4litres.
Previously (in 40 hours) we have used a total of 8 litres of oil.
Wednesday was very thick fog, so we sat at a sensiable 20knts (150-200ft visability). Eastbourne-Ramsgate saw fuel consumption rise to an average of 1.2nm/li, using a total of 60litres, and little over a litre or 1.5li of oil. This was acheived with the Dover-Ramsgate leg at a constant 39-41 knts.
What have i learnt? Optimax economy goes out of the window above about 4k - 4500 rpm. Don't go RIBing when it's flat!!!
I'm afraid i have no pic's of this trip because i forgot the CF card for the camera but i'm extremely happy with the long-distance cruising ability of top-banana after completing the 200nm trip back from Poole. Interestingly i also met another top-banana in Eastbourne - not nearly as banana shaped though
Hope the figures help some people looking at engine choices! Given 50 hours of running now i would still choose an optimax.