HopeFlynn7x
01.06.2021 11:34:11
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So although the formula is sound, it is impractical for the average Joe to use because of the number of variables. Let's just say it takes a LOT of horsepower and a LOT of money to go fast--in anything. here
Re: Formula for speed increase - hp to speed? [links]
So, let's use the 20hp as a starting point, and we have 20mph with it.
If we increase the motor size to 40hp, what is going to be the resulting speed?
The new speed would definitely be much less than 40mph, which would be the
proportional increase to match the motor hp increase. Probably be around 26mph.
Note that the power needed to push an object through a fluid increases as the cube of the velocity. A car cruising on a highway at 50 mph (80 km/h) may require only 10 horsepower (7.5 kW) to overcome air drag, but that same car at 100 mph (160 km/h) requires 80 hp (60 kW). With a doubling of speed the drag (force) quadruples per the formula. Exerting four times the force over a fixed distance produces four times as much work . At twice the speed the work (resulting in displacement over a fixed distance) is done twice as fast. Since power is the rate of doing work, four times the work done in half the time requires eight times the power.
It should be emphasized here that the drag equation is an approximation, and does not necessarily give a close approximation in every instance. Thus one should be careful when making assumptions using these equations.
I can empirically state that an increase from 90 to 125 horsepower on my 14 foot flat bottom yeilded only 5 MPH more --50 to 55. 35 % increase in HP yeilded 10 % increase in speed. ---About what I expected. here
(iv) Maximum persons capacity not over two persons; more
(4) For flat bottom hard chine boats with a factor of 52 or less, the horsepower capacity must be reduced by one horsepower capacity increment in Table 183.53.
(vi) Portable tanks must be in their designated location or placed as far aft as possible. here
(iii) The lowest ratio (quickest) steering system offered on the boat model being tested must be installed. here
But I can sell you 9ft Jet Ski with 250hp?? [links]
The official length is 17' 10" and is rate for a max of 130hp. My inline 115 runs good but I know I would be better off with a newer v6 engine. My biggest problem is budget. I was hoping to find someone with a newer v6 150 that has some bad cylinders and rebuild it over the winter. I have access to a engine machine shop and can get the work done for free so that would help me out. If anyone has something they would let go real cheap please let me know.
He has a 19ft boat rated for a 135! [links]
I've asked the USCG, no penalty, just send you to shore. Washington state is the same, they can just send you to shore. If your driving recklessly then thats a different story. I keep copys of the state and USCG laws and rules in a zip lock bag with my registration. In talking to the local water cops, I know more than they do just from reading the rules a few times.
Hey guys, just wondering what is the penalty is if you get caught with a higher HP motor on a boat than what the rating is. My 1996 Stingray is rated for a 130 hp max. I really would like to put a 150 on it by next season. Do I look for a 135 Mercury and make some mods to it up to 150+ specs. Just thinking ahead and wondering what I am up against. here
Racemore the sticker actually says, states[ "Because this boat is over 20ft in length it IS NOT rated by the US coast Guard for efficiency" This boat complies with all US Coastguard safety standards. Manufactures recomended HP range is 90-150.] To me that says that boats over 20 feet can have as much hp as they want? The recomendation is buy the manufacture not the coastguard the way I read it. I remember asking about all this when I was bringing the boat across the boarder. Im sure thats the way it is in all states for boats over 20ft as per CoastGaurd regulations. Boats that are under the 20ft mark do have maximum recomendations set by the CG just not boats over 20, the manufacture sets the recomandations it that case. James [links]
Above 175 horsepower is where speed, performance and budget really start to come into play. If budget is not major concern, I can mostly tell you we have almost never heard a guest complain “my boat has too much horsepower!” So, if you’re not as concerned with budget and you are also interested in going as fast as you can, then go to the biggest horsepower the boat will hold, understanding that big horsepower requires mandatory accessories such as power steering, which will further increase costs.
The real value of these larger horsepower pontoons is the speed and performance you can attain when the boat is loaded with crew. While under 200hp boats are more effected when loaded, a properly set up pontoon style with 200hp and over will still perform well, even with a load. Please note that regardless of size and horsepower, any boat slows down when fully loaded. We have heard from owners with high horsepower toons (i.e 250hp+) that “the boat doesn’t go full speed with my full crew,” so we have learned to remind all buyers that pontoons will slow down with greater crew on board, much like any boat. Also, we like to remind buyers that it is not all that often that you are fully loaded and wanting to drive around the lake at 40mph; most boats live the majority of their lives cruising around in the 5-25mph range. here
By “all-around” I mean it will perform watersports rather well with a crew, it will be more reactive from a standstill with a load, and will also push over 30mph with a light crew and trimmed correctly. This combination is usually still fair on the budget, so that’s why I would consider this a great all-around pontoon (i.e., fair budget, good performance, and good utility).
So… how much horsepower does you boat really need? To summarize: more
With that said, a 115hp engine on a pontoon can do a lot. Although to do a lot, your boat will typically need a few features. A 20-22 foot pontoon boat, if equipped with the a third tube (either ¾ or full tube), will make much better use of the 115hp power. If you add some lifting strakes to the tubes, you are even better off (we can have another conversation about pontoon design later). In any event, with 115 horsepower and proper pontoon set up, you can expect comfortable tubing speeds with a crew in the boat… a pretty nimble pontoon boat! Plus, when you are “light on crew,” you can expect a rather sporty toon experience… you’re not going to break any speed records, but you are certainly going to be able to speed along in the high 20mph mark and will feel rather agile doing so. [links]
If you are shopping in the 21-24 foot pontoon range and plan on carrying 8-10 passengers, a 150-175hp engine with a triple pontoon is a great all-around pontoon boat choice.[links]