Steps wrote:... 1/well powered. basically a 4.5m to 6.5m normal load will reach 42 mph WoT on flat water.. And when hit chop can set throttle a plough thru without loosing the plain. |
The Tamure Kid wrote:
Don't want to hijack the thread, but that 42mph speed is an eye opener to me, Steps. Top speed in my 4.65m ali runabout with 40hp 4 stroke is nowhere near that. Reading the indicated speed on my Garmin, the top speed I've got up to is just under 48/49 kmph (30 mph) at pretty much full throttle on flat water, with the supplied prop. Figures I've seen from a test/review in NZ Fishing News for the same boat in CC format were similar. The manufacturer's recommended (warranty) range for the boat is 40-60hp, and I've thought the 40 was adequate for my needs, which is 1 person most of the time, sometimes 2 - rarely 2 plus 2 small children. But from your number above, I seem to be well under power? |
Sufishent wrote:
Me too - I'm hoping that's a typo as I have the same size boat with a 40HP 2s and top speed for me is 54km/h, 1 pob, flat as water and trimmed right up :) I'd need to put a 60HP+ onto mine to achieve those speeds. Not sure about your boat Lester, but if I hit chop at my top speed I will a) break my back and b) then get thrown overboard. |

clank wrote:I started with a 5 mtr boat. Within a few months, cut my losses, sold it for a 6mtr, a few years later went to 7mtrs, a few more years went to 8mtrs and now 12.5mtrs so I know there is lots of for’s and against’s and compromises in all sizes. There is no right or wrong and all good adventures and memories. I do think you might get frustrated with anything under 6mtrs to go around Waiheke with enough flexibility with the weather and numbers on board. That said, there is heaps of reasons to go smaller. Tow vehicle, fuel economy, places you want to launch, within budget, storage, etc etc but for getting out past bays and estuaries I would say go as big as you can that can still tick those boxes. There is no right answer though. |
Rozboon wrote:As above, I have to disagree with the figures around "good power" when it comes to smaller, predominantly aluminium boats. They're fishing boats, built for space, stability, and load carrying capacity, not speed. Our rig (Stabi 1550/4.7m, Suzuki 70hp 4 stroke) has the largest outboard Stabi would warranty on the transom at the time (they will now allow a Yamaha 75) and we top out at about 55kph. 42mph from this hull would probably require about 90hp on the back which is bonkers. The boat handles great, I have never felt like it needed more power. See if you can find a review of an alloy boat under 5m that will do 42mph, even with motors at the upper end of the HP range for the hull. |
Steps wrote:What hp you put on is not determined by boat size to be well powered to handle unexpected crap that will happen.. What determines the Hp to well power a trailer planing hull is the gross weight on the water. Most cabin boats around the 5.5m mark are around 1100 to 1300kg including gear a 3 guys ave weight 75/80kg with 50 to 100L on board. Older alloy tend to be lighter because back then used thinner sheets for construction. eg a 6m Fryan is about 1200kg gross weight. Put 150hp on it and will hit 50mph Put a 150 on a5.5m rayglass also will do around 50 mph And same with a commander.. All of these put 115 hp they perform well.. but as others also comment .. WHO HAVE ACTUALLY RE POWERED BOATS...hit that bad chop, or just going over wakes. 140hp makes a huge difference, even with normal use. Its like having a completely different boat, totally. If you want to get little adventurous around the inner gulf islands, being min or under powered will get you home nps. take your time and will not be a pleasant trip to say the least, espec if have the missus on board... Even then , knowing the weather forecast, tides, current directions, you can leave it 30 mins to late and have a nasty chop come up to get home. That few extra hp makes a huge difference, even to the safty of your family/ crew. |
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