Fw: [Adcraftowners] Re: Honda BF 135 HP Prop Performance Data
Ed & Cindy Doyle
-Sorry all Acers: I had a very SENIOR moment. The "gal/hr label is
wrong"... All the numbers on the prop data are good : BUT all
refereces
to "gallons per Hour" are supposed to be "Miles per
gallon". Around here
most Boaters usually talk in gal/hr, not miles
per gallon; and I'm a
creasture of habit. Thanks for pointing this
out. Happy Cruising to all,edd.
In Adcraftowners@yahoogroups.com,
Mary Schulz
<schulz638@...> wrote:
>
> Are you saying
you burn 7 to 8 gal. of fuel per hour @ 10 mph/3200
rpm?? That's1.25 to 1.42
miles per gal. or am I not understanding
your figures. If that's true I'm
sticking to my 90 hp.
>
> Eddde <Shamus@...> wrote:
>
Hi ACers: Here is some data on optimizing the correct prop for the
>
Honda 135 and other engines; ie diameter vs pitch and effects on
RPM
> & speed/mileage.As Follows:
> Prop Performance
>
> Here is some data on the Honda BF 135 with Prop A: Is a Stainless
> Steel 15-1/4' inch diameter with 15" pitch (15-1/4 X 11), costing
> $250 –300 depending on source… Prop B: Is an Aluminum 16-inch
>
diameter with 11" pitch (16X11), costing $ 80 on sale.
> Prop A gives the
best cruising mileage (10 MPH at 3200 RPM with 7-
> 8 Gal/Hr); and also
for Max speed mileage (A provides a Max of 4650
> RPM engine speed, which
will give a max speed 20 MPH burning about
4-
> 5 gal/ hr). The
motor's top RPM is 4680 with this prop, and it's
> 135HP rating is for
5000-6000 RRM… But it's worth it for the great
> cruising gas mileage,
and I only travel the Max speed of 20 MPH
when
> I'm trying to outrun
some really bad weather. At idle I get 2-3.5
> MPH – depending on the
wind; great for docking…
> Prop B makes for a great inexpensive emergency
prop to keep on
> board. It will allow the 135 to reach 5250 RPM, if you
really need
to
> do that, but it only gives you 17.8 mph at 5250 RPM;
and your
mileage
> drops to around 3-4 gallons/hr. This emergency
prop is on sale on I—
> boats com for $79.00. It sure beats paying
$120-200 for a spare
prop.
> Installing both A & B props
separately and then running the same
> speed scenario for each one
obtained the data below. I adjusted and
> optimized the tilt setting
within the range of full Down to just
> under ½ Up to get the best speed
at each RPM setting. Boat fully
> loaded: gas, water, & gear; 2 folks
on board! Data Follows:
> A-Speed
>
> RPM
>
> A
MPH B Speed – MPH
> 2000
> 6.3 6.2
> 2500
> 7.5
6.5
> 3000
> 8.8 8.1
> 3250
> 10.1 8.9
> 3500
> 11.9 9.4
> 3750
> 13.1 10.5
> 4000
> 15.2
11.8
> 4250
> 17.5 13.0
> 4500
> 19.8 14.2
>
4680 ( A—MAX RPM) 20.1 (MAX SPEED)
> Not read
> 5000
> N/A
16.9
> 5250 ( B—MAX RPM)
> N/A 17.8(MAX SPEED)
> I hope you
135 owners & Dealers can use this info. It was hard to
> get any info
on the ideal prop selections for the different
engines,
> from 75HP
to 150 HP. Happy cruising ….ed & cy..
>
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