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What will replace the 2.5 offshore ???

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Old 06-10-2004, 10:15 AM
  #21
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Default Re: What will replace the 2.5 offshore ???

HMMMMMMMMM Boat jewlrey!!!

Performance diff?.....................
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Old 06-10-2004, 10:47 AM
  #22
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Default Re: What will replace the 2.5 offshore ???

T2x, are you really going to speedmasters on the Wing?
V or I six?

Damn that is gonna FLY.... literally

As for the speedmasters, well it is more than just theory it has been done. I know of many STV style mod-vp boats that run 20" motors with speedmasters, some with 15" mids and then the STD 12" mid that they were designed for. The drive shaft can be extended to work on the long shaft motors. In all cases with the exception of the 12" mid an adapter plate is required to fit the speedmaster case.
Acceleration will suffer a lot!, two reasons. One being that the prop WILL not slip with no exhaust running over it and two, being that the props have no diameter ( 10 1/4 is the biggest from merc). Now here is another few problems, they are left hand rotation.... meaning you would have to rotate your 300X backwards..... and you will HAVE to religiously change the oil after EVERY run.
A few solutions are, have the gearcase built for RH rotation ( David Steckbauer can do this), and the run 5L inboard hydro props available from merc on them... up to 12" diameter.
The boat will be slightly faster, but in most cases the existing Sportmasters are run so high that here is really only skeg dragging in the water..... so there would be no change.
Bottom line, is they are going to be expensive, slow to accelerate, fragile, don't shift and only marginally faster........ how does that grab ya?

RT
 
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Old 06-10-2004, 12:26 PM
  #23
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Default Re: What will replace the 2.5 offshore ???

Dont want to derail the thread so I put a post in the Skater section questioning the differences between the Promax and the 2.5.
Any help would be great.
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Old 06-10-2004, 12:30 PM
  #24
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Default Re: What will replace the 2.5 offshore ???

They are both 2.5's.......... that is about it.
 
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Old 06-10-2004, 07:35 PM
  #25
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Default Re: What will replace the 2.5 offshore ???

Quote:
Originally Posted by Firewalker
T2x, are you really going to speedmasters on the Wing?
V or I six?

Damn that is gonna FLY.... literally

As for the speedmasters, well it is more than just theory it has been done. I know of many STV style mod-vp boats that run 20" motors with speedmasters, some with 15" mids and then the STD 12" mid that they were designed for. The drive shaft can be extended to work on the long shaft motors. In all cases with the exception of the 12" mid an adapter plate is required to fit the speedmaster case.
Acceleration will suffer a lot!, two reasons. One being that the prop WILL not slip with no exhaust running over it and two, being that the props have no diameter ( 10 1/4 is the biggest from merc). Now here is another few problems, they are left hand rotation.... meaning you would have to rotate your 300X backwards..... and you will HAVE to religiously change the oil after EVERY run.
A few solutions are, have the gearcase built for RH rotation ( David Steckbauer can do this), and the run 5L inboard hydro props available from merc on them... up to 12" diameter.
The boat will be slightly faster, but in most cases the existing Sportmasters are run so high that here is really only skeg dragging in the water..... so there would be no change.
Bottom line, is they are going to be expensive, slow to accelerate, fragile, don't shift and only marginally faster........ how does that grab ya?

RT
Whew..........!

FW....you are one informed Kanook..........

1. Yes we will run SSM's on the Wing ....haven't decided which ones yet...but with the power to weight ratio that combo will possess, it'll probably never see...nor need........... W.O.T....so it is probably irrelevant.

2. Regarding counter rotation........... The Rolling Thunder Cat had two lefts and two rights......... and props to match... The technology is readily available...and we have it.

3. Regarding acceleration and speedmasters....... Prop slip is a function of prop height, diameter and load....all things being equal smaller props slip easier than big ones....and remember the new center sections...have power LIFT as well as power trim so you can raise your motors coming out of a turn...if you're ambidextrous or....... have a throttleman.....remember,offshore applications utilize multi-engine setups not single....therefore available power is greater...... and acceleration slower than smaller single engine craft.... an equalizing condition.

4. Regarding top end.......and handling...... Here's the beauty..... Top end POTENTIAL is increased with SSM's because even with a surfaced standard gearcase you must run on the ragged edge of water pressure limits to minimize drag....not so with the little bullets...as lower heights with SSM's have less drag loss than with the big "clunkers"....... and having driven a number of A/B comparisons (yes, many of those were done in the "stone age"......for all of those pinheads who think the laws of nature, physics, and performance boating were somehow changed by the arrival of hip hop music)....... The difference between standard units and SSM's , particularly in multi engine applications is like day and night...... Handling is MUCH smoother.....hooking in turns goes away...steering becomes lighter,.... torque action, prop walking, and transom hammering are greatly reduced leaving the boats seeming feather light by comparison....ESPECIALLY in rough water.

T2x
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Old 06-11-2004, 01:32 PM
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Default Re: What will replace the 2.5 offshore ???

Guys this sounds very interesting!!! Why hasn't there been more recreational development here??? It sounds as if the "boat" becomes a more efficient safer boat...with no reverse. can this hudle be overcome?

Fire,T2x this is GREAT!! information

marc
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Old 06-11-2004, 02:36 PM
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Default Re: What will replace the 2.5 offshore ???

Quote:
Originally Posted by Maximus
Guys this sounds very interesting!!! Why hasn't there been more recreational development here??? It sounds as if the "boat" becomes a more efficient safer boat...with no reverse. can this hudle be overcome?

Fire,T2x this is GREAT!! information

marc

The problem....as Fire pointed out is the fact that the SSM's are RACING units only and need special care and frequent rebuilds...(smaller gears, bearings, higher RPM's...etc). Their application in pleasure boating is minimal, as a result......... but as a racing alternative they have some very attractive attributes.

Reverse can be accomplished in one of two ways....a direct reversing powerhead with a two way starter and ignition system (we used that system on one engine on Rolling Thunder)....or a sturdy electric trolling motor that folds out of the way...... similar to the yamaha OB on "Jet Set".

T2x

Last edited by T2x; 06-11-2004 at 02:38 PM.
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Old 06-11-2004, 03:33 PM
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Default Re: What will replace the 2.5 offshore ???

[QUOTE=T2x(yes, many of those were done in the "stone age"......for all of those pinheads who think the laws of nature, physics, and performance boating were somehow changed by the arrival of hip hop music).......
T2x[/QUOTE]

Now Rich, we all know those laws were carved in stone right around the same time you and OG rolled that first round rock down a hill and got an idea
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Old 06-11-2004, 04:57 PM
  #29
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Default Re: What will replace the 2.5 offshore ???

Quote:
Originally Posted by Airpacker
Quote:
=T2x(yes, many of those were done in the "stone age"......for all of those pinheads who think the laws of nature, physics, and performance boating were somehow changed by the arrival of hip hop music).......
T2x
Now Rich, we all know those laws were carved in stone right around the same time you and OG rolled that first round rock down a hill and got an idea
Actually I got the idea ........and OG wound up marketing it.......

Of course without my plans for an axle, his success was short lived.....


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Old 06-11-2004, 05:11 PM
  #30
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Default Re: What will replace the 2.5 offshore ???

Quote:
Originally Posted by Maximus
Curious.....what kind of speed/acceleration difference (Vs the standard 300x sportmaster lower) would we be talking about in a Skater28/Spectre30 type setup IF you were able to bolt those up?

Purely hypothetical

Inquiring minds......
I figure 5-8 mph on top end..............

or about 130 on a 28 Skater..........

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