 rowboat bob wrote:Hey Smudge , if you get to the theoretical 50miles per hour , you have a great hull and are a fantastic helmsman. I've chickened out and backed off at 38kn ( about 44 miles an hour ) when the hull started to feel a bit skatey . I've got a similar sized hull, 5.2 m but 5.6m overall with the outboard pod. It's a fibre glass Marlborough 5.2 which is a John Haines design. I'm sure you will not be short on power . It will be interesting to hear how your boat performs with the new motor . You may find the ride improves as the extra torque at lower revs holds you on the plane better in choppy conditions . Fantastic motors , I'm sure it will feel like a whole new boat . Enjoy |
| rowboat bob wrote: [QUOTE=MB]Interesting. I have an FC560/115hp. At full tilt, it hits 60km/h in flat conditions. Feels very stable, although I wouldn't want to hit a big wave at this speed. It cruises comfortably on the plane at 40km/h and this of course is where fuel efficiency is at it's highest. 60km/h per hour is just 32 knots or 37mph . It's fast enough and all , bur the Merc four stroke 115 should do better than that on that hull. Maybe not quite the right prop. Yeah 40km/h or just over 20knots is where these motors are most economical, and where these size hulls are most comfortable in your average conditions |
| rowboat bob wrote: [QUOTE=MB]60km/h per hour is just 32 knots or 37mph . It's fast enough and all , bur the Merc four stroke 115 should do better than that on that hull. Maybe not quite the right prop. Yeah 40km/h or just over 20knots is where these motors are most economical, and where these size hulls are most comfortable in your average conditions |
, I prefer the "seat of the pants " approach to recreational fuel consumption , I mean I know I have had a good day when I have 15-20 blue cod , most of my terminal tackle , Mrs is ( still ) happy AND my 12L tote tank is still on the happy side of half . If it was on empty .... well Id be slightly less happy if half a tank was the norm but I wouldnt call it a bad day here ) , but I figure that recreation is sorta based around stress relief and thusly the fuel costs are what they need to be to get you where you gotta go and unless they are ridiculous your better off rolling with it . 
he had just bought his 1st brand new car , a Holden Brougham with a 308 ci V8 .... and it held 17 gallons ..........far out , I remember that thing towing our 20 ' boat + Graeme Hill's builders van AND his boat ( the van crapped out somehow ... cant remember )the last half of the trip to Manapouri from Invervegas . Yeah .... 2 speed powerglide .
| rowboat bob wrote: Hi MB, Its sounds a little high but not drastically. At 2.3km per L at 40km/h , you are getting 1.24 Nautical miles per L at 21.6knots so 17.42 L per hour. The Mercury website says 7.5miles per gallon at 20knots which equates to 1.72 Nautical miles per L or 11.62L per hour at 20knots . These figures were for an American bass boat and probably on a flat lake . At 40km/h you are going slightly faster than the 20knot figures quoted. More windage on your FC560 . Is it a hardtop ? That will further reduce efficiency. What prop have you got? I've got a stainless four bladed prop . I'm not sure about my 20knot fuel consumption, but the overall is 10L per hour which includes all low speeds , trolling etc and a little bit of high speed . My guess is that I'm getting somewhere between 13 and 14L per hour at 20knots . |
) becomes less relevant and well, I went from a 16 foot dory sort of thing with a 90hp 2/ yam to a 14' dart with a 35hp honda ( that weighs nearly as much as the yam ) but instead of burning 20 L/hr Im burning 2 . But then Im only going just round the corner not all the way to Durvlile , yeah , there's another thing , about necessary distances travelled to get to fishing nirvana ....... in high pressure areas ( like Nelson was ) you only have to go a wee bit further than the average ****er and your back in the fish , so sometimes you gotta factor in a bit of distance ,
| JustAnotherSpearo wrote: Now that smudge has pulled trigger and gone past the point of return. Let's start talking about black anchors. (kidding) Hopefully the 20hr service smudge doesn't roll round in that summer period when you can't book the thing in for a service! |
| rowboat bob wrote: Can you get some trolling in please Smudge? And let us know when those big early Albacore arrive. Cheers |
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