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| Engine and boat specs https://www.smwebhead.com/phpBB3/viewtopic.php?f=11&t=8959 |
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| Author: | hutch9900 [ Sun Mar 25, 2012 3:21 pm ] |
| Post subject: | Engine and boat specs |
I know I have seen it before on here, can anyone point me to obtaining my boat's specifications? I would like to have the best cruise rpm and gph type information. I had it saved on my old computer but now I dont have it anymore. Trying to figure out what my next prop will be  . Thanks in advance for the help.
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| Author: | RotaryRacer [ Sun Mar 25, 2012 3:36 pm ] |
| Post subject: | Re: Engine and boat specs |
http://www.fourwinns.com/past_product/specs Scroll down to 2005 then click the + sign and then scroll to 205 Sundowner click on it then click the preview to open a .pdf. |
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| Author: | hutch9900 [ Sun Mar 25, 2012 5:42 pm ] |
| Post subject: | Re: Engine and boat specs |
RotaryRacer wrote: http://www.fourwinns.com/past_product/specs Scroll down to 2005 then click the + sign and then scroll to 205 Sundowner click on it then click the preview to open a .pdf. Perfect! Thanks that was exactly what I was looking for. I was on the Four Winns site, but I was only finding the owner's manual and not the specs. Now for the million dollar question, what prop to buy next? |
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| Author: | hutch9900 [ Sun Mar 25, 2012 5:58 pm ] |
| Post subject: | Re: Engine and boat specs |
I can get to 5000rpm WOT with a 14 1/2" x 19 aluminum prop 3 blade. What will a 14x21 aluminum 4 blade do to my rpm? I want to keep it within the acceptable range and also not bog the engine down too much. |
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| Author: | Borchik [ Tue Mar 27, 2012 7:18 am ] |
| Post subject: | Re: Engine and boat specs |
In general changing from a 19 to a 21 will drop your RPMs about 250...however, going from a 3 to a 4 blade also changes surface area, adds some but not a ton but will likely drop your RPMs about 350 total I would guesstimate. I only recommend people change prop sizes if they are trying to accomplish something specific. |
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| Author: | hutch9900 [ Tue Mar 27, 2012 8:37 am ] |
| Post subject: | Re: Engine and boat specs |
Borchik wrote: In general changing from a 19 to a 21 will drop your RPMs about 250...however, going from a 3 to a 4 blade also changes surface area, adds some but not a ton but will likely drop your RPMs about 350 total I would guesstimate. I only recommend people change prop sizes if they are trying to accomplish something specific. Well, I dont care about top end speed, just looking for something to get me on plane faster and have a better handling cruise. Will the four blade not help with pulling a skier or tuber? What are the down sides to the four blade vs three blade props? I figured I would lose some MPH but dont know if there will be more vibration.......... |
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| Author: | Walt [ Tue Mar 27, 2012 8:54 am ] |
| Post subject: | Re: Engine and boat specs |
Well, I dont care about top end speed, just looking for something to get me on plane faster and have a better handling cruise. Will the four blade not help with pulling a skier or tuber? What are the down sides to the four blade vs three blade props? I figured I would lose some MPH but dont know if there will be more vibration..........[/quote] Like Borchick says, you will increase surface area. You also tend to lose diameter, so I have noticed a less net effect in changing blade count. In my case, I went from 19P 3 blade SS to a 21P 5 blade SS. My top end speed and WOT RPM was changed by less than 2 MPH by GPS. However, my hole-shot was completely different, as was my handling in hard turns. My $0.02.... find the perfomance you are after in a 3 blade prop first; then step to a 4 (ideally step up 1" in pitch). If you are going from 3 blade to a 5 blade prop, I recommend stepping up 2" in pitch. Otherwise you end up with a collection of "unique" props. 3 blades are easy to trade in at most prop shops (undamaged), or sell outright.... and always good to have one as a spare. Use this Prop slip calculator. It has saved me money on props. I have found Mid west to have the best prices and service on props. Good luck! |
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| Author: | hutch9900 [ Tue Mar 27, 2012 9:01 am ] |
| Post subject: | Re: Engine and boat specs |
Does your 5 blade prop have more or less vibrations than the 3 blade did? The diameter of the four blade I am considering is only 1/2" smaller than the 3 blade I currently have in 19" pitch. I will check 20" for the four blade as well. Thanks! |
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| Author: | Jafo4U [ Tue Mar 27, 2012 9:57 am ] |
| Post subject: | Re: Engine and boat specs |
RotaryRacer wrote: http://www.fourwinns.com/past_product/specs Scroll down to 2005 then click the + sign and then scroll to 205 Sundowner click on it then click the preview to open a .pdf. Very helpful link thanks for sharing. |
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| Author: | Walt [ Tue Mar 27, 2012 7:36 pm ] |
| Post subject: | Re: Engine and boat specs |
hutch9900 wrote: Does your 5 blade prop have more or less vibrations than the 3 blade did? The diameter of the four blade I am considering is only 1/2" smaller than the 3 blade I currently have in 19" pitch. I will check 20" for the four blade as well. Thanks! Nope, no noticable vibration. Sounds like a good step to take, and should give you comparable top-end and RPM performance, with a slight increase in hole-shot. Let us know what you get! Having more punch, the Hi5 requires less trim up for the same amount of bow-lift. I can crank the 3 blade up to the trim limit, and kick up a nice 3ft high rooster tail, but doesn't seem to do squat for performance. Of course, when I launch with the Hi5, everyone in the boat knows, and I stay almost all trim-down for everything. |
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