ill informed boat knowledge

[JimS123]

Re: ill informed boat knowledge

Well I just came here to find out why my boat has so many problems.

The boat just won't go on plain very easy. Also the floor is kinda soft and that's why I think the bilage pump has to work so much. I thought it might have been that I hit the dock too hard, so now I put buoys on the side. I'm always quite careful to tie the ropes real tight too. Loading on my trailer has been an issue as well. I think I might need a new wench.

 

[bruceb58]

Re: ill informed boat knowledge

Dual prop drives are slower not faster than single prop

TRUE and FALSE...Top speed maybe but for acceleration, the duo-prop beats the single prop.

If you go on the Volvo site and go into their engine configure tool, The duo-prop has a 2 MPH higher speed for a 5000# 24' boat than a single prop so also depends on the boat. Bigger heavier boats do better with a duo-prop.
http://www.volvopenta.com/volvopent...e_configurator/Pages/engine_configurator.aspx

Need to find that video that Volvo put out years ago showing two identical boats accelerating from a dead stop.

I would never buy a single prop boat again.

When going from aluminium to SS go down a pitch

FALSE...Since a stainless steel prop is thinner than an aluminum prop, you can actually go up a little in pitch to get the same WOT RPM.

Fuel injection produces more HP than carburetor

TRUE if ts MPI. Older TBI styles offered no increase in HP

 

[QC]

Re: ill informed boat knowledge

Merc recommends B1 for speeds in excess of 60 MPH. Below that, top speed seems to be close. Acceleration is absolutely better with both Duo-prop and B3s.

 

[WaterDR]

Re: ill informed boat knowledge

Marketing literature that states HP rating may sell boats, but it does not win races.

 

[QC]

Re: ill informed boat knowledge

Maybe that's ^^^^^^^ what the OP intended since the opposite is true. But his original list was all true, not false.

 

[trendsetter240]

Re: ill informed boat knowledge

Maybe that's ^^^^^^^ what the OP intended since the opposite is true. But his original list was all true, not false.

I'm still not sure what the purpose of this thread is!.lol. I think that the first post is a list of statements that he thinks are true??

 

[bruceb58]

Re: ill informed boat knowledge

The benefits of Duoprop - The benefits of Duoprop : Volvo Penta

Duoprop provides up to 30 % faster acceleration and produces a top speed some 5 % faster than any conventional single propeller system

 

[QC]

Re: ill informed boat knowledge

I'm still not sure what the purpose of this thread is!.lol. I think that the first post is a list of statements that he thinks are true??

If that's what it is, then I actually agree with him . . .

 

[bruceb58]

Re: ill informed boat knowledge

Yes I totally agree that he thinks what he wrote is true.

 

[QC]

Re: ill informed boat knowledge

So do I .

This is fun, bruce . . .

You would have to prove that Volvo's single prop drive is representative of all single prop drives, and you need to establish what speed ranges the claim is applied to.

 

[Mischief Managed]

Re: ill informed boat knowledge

The actual performance of the boat with each engine tends to confirm this as the 525 powered version is about 10mph faster. An extra 100hp won't push that hull 10mph faster; there has to be more to it.

100 HP might be good for 10 MPH. What was the top speed with 425 HP?

 

[UncleWillie]

Re: ill informed boat knowledge

...LOL...is Aluminium that new super material? Never heard of it!...

Aluminium has been around for billions of years

 

[bruceb58]

Re: ill informed boat knowledge

Aluminium has been around for billions of years

I stand corrected!

 

[bruceb58]

Re: ill informed boat knowledge

So do I .

This is fun, bruce . . .

You would have to prove that Volvo's single prop drive is representative of all single prop drives, and you need to establish what speed ranges the claim is applied to.

I don't think I have the resources to prove that!

 

[achris]

Re: ill informed boat knowledge

.... But back to your quote . . .

Double check that, not here they didn't. I/Os and OBs are all prop rated. Inboards, crank rated.

I'm taking my information from a Mercury Marine release on MCM Model year SN range, posted by DonS a few years ago.

MCM Model year SN range - Download - 4shared - Don S

Have a look at page 74 (the 82nd page of the PDF) about half way down. Sub-note 'a'....

a. Starting Jan 1, 2003, all gas engine were made to meet a California CARB regulation. Also gas engine hp is rated at the crankshaft. There is no change in the hp listed, just the hp measurement location changed.

It then lists the starting serial numbers for the different engines.

Until I read that just a couple of years ago I was also under the impression that everything was prop-shaft rated.... But there you go....

Cheers,

Chris......

 

[achris]

Re: ill informed boat knowledge

LOL...is aluminium that new super material? Never heard of it!...

Just for fun.....

Aluminium is a chemical element in the boron group with symbol Al and atomic number 13. It is silvery white, and it is not soluble in water under normal circumstances.

Aluminium is the third most abundant element (after oxygen and silicon), and the most abundant metal, in the Earth's crust. It makes up about 8% by weight of the Earth's solid surface. Aluminium metal is so chemically reactive that native specimens are rare and limited to extreme reducing environments. Instead, it is found combined in over 270 different minerals. The chief ore of aluminium is bauxite.

Aluminium is remarkable for the metal's low density and for its ability to resist corrosion due to the phenomenon of passivation. Structural components made from aluminium and its alloys are vital to the aerospace industry and are important in other areas of transportation and structural materials. The most useful compounds of aluminium, at least on a weight basis, are the oxides and sulfates.

Despite its prevalence in the environment, aluminium salts are not known to be used by any form of life. In keeping with its pervasiveness, aluminium is well tolerated by plants and animals. Owing to their prevalence, potential beneficial (or otherwise) biological roles of aluminium compounds are of continuing interest.

 

[bruceb58]

Re: ill informed boat knowledge

Just for fun.....

I guess you didn't see post 32 and 33.

 

[achris]

Re: ill informed boat knowledge

I'm still not sure what the purpose of this thread is!.lol. I think that the first post is a list of statements that he thinks are true??

If that's what it is, then I actually agree with him . . .

So, where is the OP??? Or has he just tossed in the hand grenade and run away..

 

[achris]

Re: ill informed boat knowledge

I guess you didn't see post 32 and 33.

Yeah, I did... Just threw that in for fun.....

Ah, what didn't show up too well was the wiki link... Sorry about that....

 

[roscoe]

Re: ill informed boat knowledge

Any grease is better than no Grease !!!