February 2005 Maxum Sports Yacht Owner Group

Updated:1/10/05 Printer Version

February 2005
Maxum Sports Yacht Owner Group

This E-mail will go to all Paid Maxum Owners


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Maxumowners.org

This E-mail talks about:

Checking your propeller selection:

Checking your propeller selection 4600 SCB:
450 HP Cummins Engines
Marine Gear: Twin Disk Model # 5061A, Ratio =1.54
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Checking your propeller selection 4100 SCB:
330 HP Cummins Engines
Marine Gear: V-Drive: ZF Hurth Model #HSW 800A2 Ratio "A" =1.96 "B"=1.96

Checking your propeller selection 4100 SCB:
370 HP Cummins Engines, Engines, 355 SAE HP
Marine Gear: V-Drive: ZF Hurth Model #HSW 800A2 Ratio "A" =1.96 "B"=1.96
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Checking your propeller selection 4100 SCA:
370 HP Cummins Engines, 355 SAE HP
Marine Gear: V-Drive: ZF Hurth Model #: HSW 800 V1-1.6 Ratio "A" =1.64 "B"=1.64

Checking your propeller selection 4100 SCA:
330 HP Cummins Engines, 315 SAE HP
Marine Gear: V-Drive: ZF Hurth Model #: HSW 800 V1-1.6 Ratio "A" =1.64 "B"=1.64
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Checking your propeller selection 4100 SCR:
330 HP Cummins Engines
Marine Gear: V-Drive: ZF Hurth Model #: HSW 800 V1-1.6 Ratio "A" =1.64 "B"=1.64

Checking your propeller selection 4100 SCR:
370 HP Cummins Engines, 355 SAE HP
Marine Gear: V-Drive: ZF Hurth Model #: HSW 800 V1-1.6 Ratio "A" =1.64 "B"=1.64
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Checking your propeller selection 2700 SCR:
300 HP Gas Engine
Marine Gear: Outdrive, 1.81 :1
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Cummins "B" series engine

Maxum Gear For Sale:

Maxum has defined new models for 2005

I am therefore looking for another set of Master Mariners
For the Maxum
2500 SE, 2900 SE, 3100 SE, 3300 SE,
3700 SY, and 4200 SY

You can find your Master Mariners by clicking here
E-mail us @ billegates@aol.com

-----------------------------------
"The only thing good about getting older is
that it is easier to fix something to
last a lifetime than it was when you were in your 20's."
- Anon-
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Here we go.
Maxum has used CJR as the prime vender for the propellers on our boats. This is not to say that this what you have, this is a boat and anything could have happened. The CJR props were ordered as NIBRAL, Ultra Skew, .75 BAR, Rake 0, Skew 28. Owners have reported having trouble with vibration when having their props sent to the "Prop Shop" from rebalancing, these propeller cannot be trued on standard Michigan prop blocks! They are completely different, and can be ruined if this is attempted. I have had my props done 4 times, using propscan machines, and via older vibration balancers. All without getting back a bad set. Others have not been as lucky.

Please remember to look at the "Graphs" section of our webpage for additional performance data.

This is a CJR Ultraskew .75 propeller

Ultraskew .75 for luxury motor yachts and any high performance craft
where low noise and vibration are essential DAR 75%, Rake 0, Skew 28

CJR Propulsion Limited, 72 Quayside Rd. Southampton Hampshire England So181AD
http://www.cjrprop.com/ E-Mail: info@cjrprop.com

Michigan Wheel is @ http://www.miwheel.com

Propeller Terms and Definations:

24 x 22 means, 24" Diameter, 22" Pitch.

NiBrAl, or NIBRAL, stands for Nickel, Bronze, Aluminum & Manganese Bronze, a very hard strong and non deforming material.

BAR and DAR are the same thing. BAR is Blade Area Ratio, and is also referred to as DAR, Disc Area Ratio, a circle has a BAR of 1.0, take a 10% wedge out of it and it reduces the BAR to .90. In the case of the above propellers, the BAR is .75% of a full circle.

Rake: Rake can be positive or negative tilting of the blade fore aft, typically used in racing, or confined tunnels, there is no rake in our propellers.

Skew: Skew is the transverse sweeping of a blade such that viewing the blade from the fore and aft shows an asymmetrical shape. Skewing allows the blade tips to contact the passing water in a more progressive and evenly distributed power slice, thus reducing Vibration and increasing efficiency.

Over Pitched, can cause you to be slow to get on plane, excessive cavitation, improper engine RPM.

Under Pitched, great low end performance, inability to get achieve you boat Max speed, improper engine RPM

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Maxum Owners Forum
Checking your propeller selection 4600 SCB:
450 HP, Cummins Engines, 430 SAE HP
Marine Gear: Twin Disk Model # 5061A, Ratio =1.54

The Data Below is for a 4600 SCB

The actual propeller supplied by Maxum was a 24x22 NIBRL Ultra Scew,
.75 BAR, Rake 0, Skew 28, made by CJR Propeller in England.

We have 24x22 Propellers and here are our on the water results

Actual Cruise @ 2400 RPM has been @ 24 MPH, 20.8 knots
Actual WOT @ 2600 RPM has been @ 29 MPH, 25.18 knots

Convert from Knots to MPH (x1.15)
Convert from MPH to Knots (x.868)

The above data says, we could go slightly faster, @ 22.2 pitch
especially @ cruising speed, remember that this is just a formula to get you into a ballpark.
It gives you an estimation of results based on your inputed data,
and it uses some general assumptions reguarding hull form etc.
But, if I do bang up my props perhaps, I will repitch to 22.2, or 22.5 I'll let you know the results.

Above data supplyed by Jim Clausen, 4600 SCB Master Mariner.

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Checking your propeller selection 4100 SCB:
330 HP Cummins Engines
Marine Gear: V-Drive: ZF Hurth Model #HSW 800A2 Ratio "A" =1.96 "B"=1.96

The Data Below is for a 4100 SCB

The actual propeller supplied by Maxum was a 24x23 NIBRL Ultra Scew,
.75 BAR, made by CJR Propeller in England.

Convert from Knots to MPH (x1.15)
Convert from MPH to Knots (x.868)

This was from our "E-mail History"
4100 SCB Prop Sizing

From: RGTufts@aol.com
Date: Mon Jan 27, 2003 12:33:37 PM US/Eastern
To: captainjim@boatowner.org
Subject: Maxum owners group

Jim,
Thanks for the information on the website. I have a question about my
propeller sizing that I might get help from other boat owner. I have a 1999
Maxum 41 SCB, owned since new, I have 330 Cummins and are swinging 24x23 4
bladed props. My max speed is about 19 knots. A friend of mine have the
identical setup in a 41 SCA and does 2-3 knots faster swinging 24x26 4 bladed
props. Has anyone tried different props on the 41 SCB to give me any
feedback.

Thanks
Robert Tufts
985-869-6700

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Checking your propeller selection 4100 SCA:
330 HP Cummins Engines, 315 SAE HP
Marine Gear: V-Drive: ZF Hurth Model #: HSW 800 V1-1.6 Ratio "A" =1.64 "B"=1.64

The Data Below is for a 4100 SCA

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Checking your propeller selection 4100 SCA:
370 HP Cummins Engines, 355 SAE HP
Marine Gear: V-Drive: ZF Hurth Model #: HSW 800 V1-1.6 Ratio "A" =1.64 "B"=1.64

The Data Below is for a 4100 SCA

This was from our "E-mail History"
-----Original Message-----
> From: robertcephas [mailto:robertcephas@snip.net]
> Sent: 28 April 2003 15:47
> To: Claire, @ CJR Propeller
> Subject: new prop purchase
>
> my name is Robert W. Cephas---I own a 1988 maxum 4100 SCA
> and am interested in purchasing a new set of your propellers for my
> boat. I am a member of the maxum owners group and am also the
> designated master mariner, chief of the boat, and product specialist
> for the 4100 SCA.
> In our 1/29/03 issue of the owners group news letter, it talked about
> Mark Russell, and CJR propulsion limited and briefly about buying
> propellers, cost, and shipping to the USA. Please respond to this e-mail
> enquiry so that your process, pricing, discounts, and shipping times
> can be discussed. The props that came with the boat are as follows:
> 24X26X4,HS,LH,NI,2"shaft,6"HUB and
> 24X26X4,HS,RH,NI,2"shaft,6"HUB. The props are nibral.
> I would like to install new props and have the old ones reconditioned
> and retained as spares. I hope to hear from you soon. Robert W. Cephas

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Checking your propeller selection 4100 SCR:
330 HP Cummins Engines, 315 SAE HP
Marine Gear: V-Drive: ZF Hurth Model #: HSW 800 V1-1.6 Ratio "A" =1.64 "B"=1.64

Checking your propeller selection 4100 SCR:
370 HP Cummins Engines, 355 SAE HP
Marine Gear: V-Drive: ZF Hurth Model #: HSW 800 V1-1.6 Ratio "A" =1.64 "B"=1.64

Checking your propeller selection 2700 SCR:
300 HP Gas Engine
Marine Gear: Bravo III Outdrive

The Data Below is for a 2700 SCR
(2755MT01)

Information based on a 2002 - 2700 SCR:

Dry Wt: 9200 lbs
Waterline length: 28' 1"
Single Engine, gas
HP rating per model:
5.7L 260 HP
350 MAG 300 HP
6.2 MPI 320 HP
7.4 MPI 310 HP
Cruising RPM: 3400-3600
Cruising Speed: 25-27 knots (based on my vessel and condition dependant)
Outdrive: Bravo III
Propellers: Stainless Steel counter rotating, 22-26"P no aftermarket available.
Outdrive Gear Ratio: 1.81:1 ratio listed for 350 MAG engine
Let me know if you need more
Dave
Above data supplyed by Dave Mitchell, our 2700 SCR Master Mariner.

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Maxum Owners Forum
Didn't find what you were looking for?
Send me your data and I'll try to get you your propeller information:

Just fill in the blacks more of less.

The hull form will be Average Planing in most cases
I need the boats weight
Waterline length
# of Engines
Engine HP, and SAE HP
Max engine RPM
Cruising RPM
Type of transmission, Sterndrive, Straight drive or V drive
Transmission Ratio

Propeller # of blades
Diameter and pitch of propeller

Shaft Diameter on inboard boats with straight or V drives:
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Maxum Owners Forum
Cummins "B" series engine:

Did you know that the Cummins B series engine is used in more trucks in Europe than any other?

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Maxum Owners Forum
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Maxum Owners Forum
:

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Maxum Owners Forum
Special For Sale:
http://www.maxumowners.org/talkshopparts/
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For Sale:
Boats...

Yes, you can list your boat for sale on the Maxum Owners Website, if you a paid member its free.
Send me your description and particulars, photos if you have them or we can use stock photos.
Jim Clausen mailto:billegates@aol.com
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Please Take Note:

If you send me an E-mail, please put "Maxum Owners Group" in the subject bar.
Due to all of the junk mail I get, there are times when I trash mail in batches,
if I don't recognize you E-mail address I might just toss it by mistake, thanks. James

If you would like to be removed from this E-mailing list send me,
James, an E-mail @ CaptainJim@BoatOwner.org and request to be removed.

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