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Cat Vs Mono Debate explained for the newbies

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Cat Vs Mono Debate explained for the newbies

Old 04-03-2008, 11:12 AM
  #81  
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Default Re: Cat Vs Mono Debate explained for the newbies

UaVaj - 4/3/2008 12:32 PM

Back-in-Black

Fast Cruise w/ normal load
4000RPM @ 2.1MPG @ 45.7mph
4500RPM @ 1.8MPG @ 51.4mph

Fast cruise w/ offshore load
4400RPM @ 1.6MPG @ 50mph

Given that cruising speed that milage is impressive especially on a 28 footer w/ twin 250XS. I could just imagine the increase milage on what a "lite cruising load" would be?

Let's just say there was another Contender 25 w/ twin 200 HPDI and it's owner is claiming only 1.8mpg @ 35mph cruise. Must be way less at 45mph fast crusie. WOT is at 53mph - there goes the MPG. No wonder it is not selling. Must be those Yamaha.
http://www.thehulltruth.com/forums/t...ighlightmode=1
With a half tank of gas, t-top canvas up, 2 people, and with gear (our typical return load), we can get 2.2 mpg up to 40 mph, rare to get 2.2 at 40, but even with a heavy load it's right at 2.0. We've seen 2.4+ at 32-34 mph, but that ain't no fun. In heavier seas, we can still get 2.0 at 35ish, or 1.8 if it really gets rough and we knock it down to 28-30.

Oh, that's a 25' Contender twin 200hpdi's. Top end 54.5 same load as above.
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Old 04-03-2008, 12:11 PM
  #82  
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Default Re: Cat Vs Mono Debate explained for the newbies

I get 52 or 53 WOT
1.7-1.8 at 32-35mph up to 3' seas of any kind
1.6 at about 30mph in real 4' seas
1.4 at 25-28mph in 4-6' with mph and mpg gallon way down in anything bigger
1.8-1.9 roughly in the ditch at 35-40mph
Ideal mileage is about 28-30 mph in good seas...but I am always running in the mid 30's mph
Not a gas miser but it does ride dern good.
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Old 04-03-2008, 12:13 PM
  #83  
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Default Re: Cat Vs Mono Debate explained for the newbies

UaVaj,
I am going to have to call BS on myself about the TV 62MPH, I am sorry and I am sure THT will never forgive me for it. We have a 29 TV with 300's that is running 62, but with the 250's it is only running 56 MPH.
The test on Twin Vee's website was done with our demo boat, and the test was done during E-tecs break in mode, so the economy #'s are a little better than what the printed test shows. That boat will get almost 1.9 Mpg @ 45 - 50 mph though.

The WC numbers are accurate #s


Thanks, ~ Joe and sorry for the misleading info.
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Old 04-03-2008, 01:06 PM
  #84  
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Default Re: Cat Vs Mono Debate explained for the newbies

UaVaj - 4/3/2008 12:32 PM

Back-in-Black

Fast Cruise w/ normal load
4000RPM @ 2.1MPG @ 45.7mph
4500RPM @ 1.8MPG @ 51.4mph

Fast cruise w/ offshore load
4400RPM @ 1.6MPG @ 50mph

Given that cruising speed that milage is impressive especially on a 28 footer w/ twin 250XS. I could just imagine the increase milage on what a "lite cruising load" would be?

Let's just say there was another Contender 25 w/ twin 200 HPDI and it's owner is claiming only 1.8mpg @ 35mph cruise. Must be way less at 45mph fast crusie. WOT is at 53mph - there goes the MPG. No wonder it is not selling. Must be those Yamaha.
http://www.thehulltruth.com/forums/t...ighlightmode=1
So are you telling me I' lying about those perf #'s? That's what I get out of all that. Well, if so, I'll extend the same invite for you to come on down and see it for yourself. Better yet, since I can't post pics here, here's a link to a pic of my smartcraft guage recording the 2.0 mpg # at 47.3 mph and 4050 rpm.
http://outdoorsbest.zeroforum.com/ze...=710975&page=1

Also, pay special attention to the average mpg number at the bottom right of the screen!

And here's a link to a picture of the guages at 50-52 mph, full load, GOM at 1.5 mpg.
http://outdoorsbest.zeroforum.com/ze...ost&id=8332450

The smartcraft guages are hooked to the C-80 GPS via NMEA and therefore the speed is VERY accurate at high speeds. The flow meters on the Optis are the most accurate I've ever seen and are ALWAYS within a tenth of a gallon on a total fuel burn of 125 to 160 gallons.

Yes, I know I'm claiming better numbers than the same boat with 200 HPDI's. But remember, due to the extra 100+ hp, I can run 24" props while the 200's must use 19-21's. I had 200 OX66's with 21" SWS props on my boat originally. With that setup I was getting 1 mph per 100 RPM at planing speeds... so 4000 rpm = 40 mph and 4500 rpm = 45 mph. With my current setup, I get rpm +7, or 4000 rpm= 47 mph and 4500 rpm= 52 mph. The 200 HPDI guys are getting the exact same speed vs. rpm results with the 21" props as I was getting with my OX66's, just better mpg with the HPDI's, but still not as good as I get with 24" props. Yes, my 250's will probably burn more fuel than the 200's when compared rpm to rpm. But I'm not comparing rpm vs. rpm... I'm comparing speed vs. speed and I turn 700 less rpm to get the same speed out of my boat as the guy's with the HPDI 200's.

If you think my photos are BS, like I said, I'll be happy to take you out and prove it any day.

And as far as the 250 gals of water on my head? I'm just telling you what happened. I have no reason to lie about that, afterall, the reason I was in the boat was because I was basically doing an extended sea trial in a cat before I bought one myself. Shortly after those several cat trip (sea trials), I bought my Contender.
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Old 04-03-2008, 03:15 PM
  #85  
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Default Re: Cat Vs Mono Debate explained for the newbies

back in black I saw you take that picture the other day , you were in your 10 foot jon boat with a 2 hp honda
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Old 04-03-2008, 03:43 PM
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Default Re: Cat Vs Mono Debate explained for the newbies

Yep, 10 ft john boat, but it's the baaadest 10' john boat out there with a C-80 installed!!!

BTW, I screwed up the second link in that post, so here's the right one.

http://outdoorsbest.zeroforum.com/zerothread?id=679457
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Old 04-03-2008, 04:35 PM
  #87  
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Default Re: Cat Vs Mono Debate explained for the newbies

Back-in-Black - 4/3/2008 8:33 AM

Bullshipper - 4/3/2008 9:27 AM

Back-in-Black - 4/3/2008 1:19 AM

ariels_dad - 4/1/2008 2:45 PM

reelassets is smoking crack to say a mono gets better gas mileage than a GB of same size
I guess I must be smoking the same stuff.

Here's a quote from earlier in this thread: "I ran a WC 27te from Pompano to Andros, 150 miles, twin honda 225's, 35mph at 3500....1.9 mpg with full load....crossed the stream no prob....that's very comparable to most mono's of the same capability...."

Ok my boat is a contender 25 (28'). Real world numbers with 185 gal fuel, four adults and misc. other stuff. 4050 RPM, true 2.0 mpg and 47.3 mph.
Real world numbers from fishing trip in the GOM. 4 men, 150+ gal fuel, 500 # ice, hundreds of #'s of gear, food etc.. live well full, fresh water tank full... cruise 50 mph at about 4400 RPM and true 1.6 mpg. Don't have any real world numbers for going 35 mph as I never go that slow, but in calm water I get these numbers (185 gal fuel, 4 adults, etc.). All that BS about cats being more efficient is just that... BS. They're not any better than mono hulls.

RPM………………….MPG………………..MPH
3000…………………..2.3…………………….29.5
3500…………………..2.3…………………….40.5
4000…………………..2.1………………….…45.7
4100…………………..2.0…………………...47.3
4500…………………..1.8…………………….51.4
5000…………………..1.5………………….…56.5
5500…………………..1.2…………………....63.1

There are 28 foot cats with full cabins getting 3.5-3 mpg

There are 38 x 14 cats getting +5 mpg.

So that is about 70% better of what you're proud of.

The notion that a Worldcat or a Contender are fuel efficient cracks me up.
So you're saying that a 28' cat with twin outboards can get 3.5 mpg? At what speed, 15 knots? Sorry, I'll believe that when I see it. BTW, I can get 3.5+ mpg all day long at trolling speeds and most of those cats run about that speed. Besides, there's a 38' mono with twin yanmars that tops out at 60 mph and can cruise upper 40's at 3.5 mpg. Can any cat do that? Not one I've heard of.

A 38x14 cat at 5 mpg. You're not going to try to tell me that one has twin outboards and can cruise at 50 mph are you. You're talking apples and oranges now and your point is irrelevant. Kind of like comparing a moped that gets 100 mpg to a P/U truck that gets 18 mpg.... Where's the point of comparison?

My comparison was to a 27' cat with twin 225's. My boat is 28' with twin 250's. I think that is a little more of an apple to apple comparison than what you're talking about.
You like most monohull afficionados are not very informed about cats.

The Roger Hill 28x10' beam gets 3.5 mpg at a 30 mph cruise with twin Honda 150's, 3 mpg at a 35 mph wot. My friend Skypoke built and operates one of these in Port O'Conner Texas.

http://www.powercatsnz.com/pages/get...D=11&view=phot

The supercat 38 x 15'8" beam uses twin 80's-100's with sponsons inspired by guys like malcom tennet and this boat does 28 knots wot.

http://www.supercat.co.za/DSCF0027.JPG

If you want to talk diesel, the 38 comes with twin 27 hp if you really want to save on fuel.

You can always add more power if you want more speed, but the point here is to get a good ride on a stable platform and not burn the kids trust fund in gas money.

Right?

Their 29 uses twin 40's. Can your 28' contender go 30 mph on 80 hp?






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Old 04-04-2008, 05:48 AM
  #88  
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Default Re: Cat Vs Mono Debate explained for the newbies

yea, that'll teach em
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