26X speed and RPM,s

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MMMike
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26X speed and RPM,s

Post by MMMike » Wed Jul 07, 2004 5:48 pm

Aye there,

I got a 2000 26X with the Hutatsu 50.

At full throttle I miss red line on the tach by 1100 Rpms
Also speed is about 12 knts full ballast.

Are these #'s right or is something wrong?

MMMike

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TonyHouk
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Post by TonyHouk » Wed Jul 07, 2004 6:00 pm

Mike the missing the top end by 1100 rpms does not sound good but the full ballast speed sounds about right. I have the Nissan 50 and that is the speed the boat acheives with full ballast. My 50 revs up to about 5600 rpms with the BWY's prop. Hope that helps and happy sails, Tony

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Erik Hardtle
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RPMS

Post by Erik Hardtle » Wed Jul 07, 2004 7:05 pm

Last time I looked at mine was this weekend. I have a 50hp Honda 4-stroke.

Unballasted, fully loaded (2- 9 gal fuel, 2 gel batteries, 9 gal water, 2 adults, 2 kids) = 19.5 mph @ 4800

Unballasted, just me plus the batteries & fuel = 25 mph @ 4800-5000 rpm.

Ballasted, fully loaded = 17-18mph @ 4800 rpm

I never seem to go into the red which is at 5000 rpm..

Hope this helps.

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Dimitri-2000X-Tampa
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Post by Dimitri-2000X-Tampa » Wed Jul 07, 2004 7:38 pm

Wow Erik, you sure get a lot of speed out of that Honda. I've never gone faster than 18.5 mph with mine, and my ballasted/loaded speed never goes above about 14 mph. Do you have bottom paint?

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jsserene
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Post by jsserene » Wed Jul 07, 2004 8:30 pm

According to my 2001 Tohatsu 50D manual, the WOT range is 5150-5850 R.P.M. I have the stock prop 11.75 x 11 which according to Blue Water Yachts is the best prop. I get around 18 mph at 5500 R.P.M. with no ballast. 8)
Jeff

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Robert
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50hp is 50hp no matter the manufacturer

Post by Robert » Wed Jul 07, 2004 8:36 pm

You should get the same speed with any motor capable of using all 50hp efficiently at the prop.
..
Somebody somewhere is about to test the Tohatsu 4 blade 7.1 pitch prop on a Tohatsu 50hp. I think they will have great success and I look forward to reading about it here.
..
My Suzuki DF50 with Solas 3x12.25x9 pitch stainless prop with ballast full was 6400 RPM and 16.5 to 17.5 mph. With ballast empty 6800 RPM and 20 to 21 mph. The Suzuki rep said the DF50 which is rated to run 6500 RPM is happy to run 7000 RPM all day with no ill effects, the rev limiter is set to 7250 RPM, and the torque drops off above 6800 RPM making it self limiting anyway. I think getting to the top of the RPM band with full ballast is most important because hp is proportional to RPM so I was very happy with the 6400 RPM with full ballast for getting all the power the DF50 could provide.
..

Frank C

Re: RPMS

Post by Frank C » Wed Jul 07, 2004 9:52 pm

Erik Hardtle wrote:Last time I looked at mine was this weekend. I have a 50hp Honda 4-stroke. ... Unballasted, fully loaded (2- 9 gal fuel, 2 gel batteries, 9 gal water, 2 adults, 2 kids) = 19.5 mph @ 4800
Erik,
Is your speed transducer transom-mounted, or ... ?

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Timm Miller
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Numbers

Post by Timm Miller » Thu Jul 08, 2004 3:51 am

My Honda WOT is 5900 rpm's and I cruise at 5500 and I see speeds of 15 mph.......5000 rpm's is too low for WOT and the motor must be lugging...which will wear it out sooner. What prop are you running and as Frank asked.....is this a stern mounted speedo?

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Erik Hardtle
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Speed

Post by Erik Hardtle » Thu Jul 08, 2004 4:58 am

The transducer (speed wheel and depth sounder) is transom mounted and feeds into a Garmin GPS.

I believe I have the standard prop that came with the motor.. I'll see if I can check out what it is later today.

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Timm Miller
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Speed

Post by Timm Miller » Thu Jul 08, 2004 6:33 am

Speed over ground (SOG) and speed through the water can be two different worlds.

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Jesse Days Pacific Star 2
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Post by Jesse Days Pacific Star 2 » Thu Jul 08, 2004 7:27 am

On the way back from Browsville, through Aggate passage, I was cruising at a nice 4400 RPM and was hitting 17.1 knots. I figure that it was about 80% throttle.

Jesse

Frank C

Re: RPMS

Post by Frank C » Thu Jul 08, 2004 9:37 pm

Erik Hardtle wrote:Last time I looked at mine was this weekend. I have a 50hp Honda 4-stroke. ... Unballasted, fully loaded (2- 9 gal fuel, 2 gel batteries, 9 gal water, 2 adults, 2 kids) = 19.5 mph @ 4800 . . . Unballasted, just me plus the batteries & fuel = 25 mph @ 4800-5000 rpm.
Erik,
I guess I should have asked a slightly different question. Paddle wheels are notorious for calibration errors, and w/all due respect, no Honda 50 has ever pushed a Mac to 25 mph that I've heard or read of, unless it's down the Mississippi River, or as Jesse mentions, atop a rippin' PNW tidal current.
:o
Your GPS probably has numerous display options. The question really is, have you ever set your GPS to display both WS (water speed) and GS (ground speed), and how do those two readings compare?
:?
Downstream, GS should exceed WS by a bunch, upstream, the opposite. Cross-current, or on a lake, those two readings should be identical, or the paddle wheel needs calibration. FWIW. :wink:

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Erik Hardtle
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Hmmm

Post by Erik Hardtle » Thu Jul 08, 2004 9:51 pm

Hey quit ruining my fun! :P

I think I have been viewing Speed over Water...

I haven't calibrated anything... I guess I should read up and do that. I figured a wheel is a wheel. I did have a friend pace with me in his powerboat to confirm the speed... not that his meter was calibrated either! (analog needle display... like a car, and he'd been drinking :? )

Well now I have something to play with next time I'm out.

Oh, and my bottom paint is Gloss Black Rustolem.. :)

Frank C

Post by Frank C » Fri Jul 09, 2004 1:32 am

Thought so ... so sorry! :(
(but I'm sure that "gloss" black Rustoleum is helping!)
:D :D :D

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Dimitri-2000X-Tampa
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Post by Dimitri-2000X-Tampa » Fri Jul 09, 2004 5:20 am

Well hull, all these years, I've been paying thru the nose for ablative bottom paint and you're telling me I could have just used rustoleum instead?!? And I suppose it keeps that fiberglass from rusting too! Look Ma, no rust...must be working! I'll bet I could replace that expensive standing rigging with some chicken wire from HD too! :D

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