there are soooo...many variables and possibilities. are you doing some of the work yourself, having it done.. how much money do you plan on spending... I installed a single cummins in my 27 express and get about 2.5gph at 9 knots and 1400rpm...slightly above hull speed. cant quite figure out " planning " speed as the rise is so gradual it simply doesn't climb on plane like a small ski boat..my top speed is 20+ at 2500 rpm when I repowered my sailboat ( 78ft) and 85,000 lbs I got a constant 1.4 gph at 1400 at 7.2 knots with a single ford lehman 120, 3:1 gears and a 28" prop... if you are mechanically inclined, buy two used cummins 6bt from wrecked dodges, preferably 1994 to 1997 12valves with " P " injection pump, or (1992 and 93 will do, VE pump ) completely mechanical injection, as long as they have under 200,000 miles you're good as you still have 1/2 life left and marinize the engines, bowman in england makes manifolds, the bell housings can be found in wrecking yards... I believe someone here makes an adapter for the stock dodge bell housing to hurth gearbox... of course the simplest is to simply buy two new engines and go that route.... stay away from the cummins 4bt, great engines but very noisy ( vibration)...and realistically a bit small for your application even at 250 hp each in marine form.
eric ----- Original Message ----- From: xlngolf<mailto:[email protected]> To: UnifliteWorld<mailto:[email protected]> Sent: Monday, September 07, 2009 1:30 PM Subject: [UnifliteWorld] 36' DC Repower semi trawler Looking to buy 36' DC and repower with small diesels for inland cruising 90% of the time at 8 mph but want to make plane for emergency. Does anyone know what minimum planing speed is? With what engines, rpm, trans. ratios, prop size do you have. Anyone with feedback on cruising this model at 8 mph does it roll or pitch too much? My calculations show the need for 40 bhp to maintain 8 mph and 110 bhp to make 11. Lose valuations after that because I don't know minimum planing speed for this hull. --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "UnifliteWorld" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/unifliteworld?hl=en -~----------~----~----~----~------~----~------~--~---
