Menu

Speed and Fuel Consumption Curve

Search this Thread

Prev

Previous Post

Next Post

Next

#2

Report Post

posted to rec.boats

[email protected]

Posts: n/a

Default

Speed and Fuel Consumption Curve

wrote:
Just finished a *long* article about a very nice new boat.

Here's an interesting study in fuel efficiency from last Friday's test
run.

50-foot boat, 50,000 pound displacement when fully laden. (We ran the
test light ship),
525 HP single John Deere 6125AFM. 40X 32 prop.

700 rpm. 5.5 knots, 1.4 gph. (better than 3 nmpg)

1050 rpm. 8 knots, 3.5 gph. (still better than 2 nmpg)

1200 rpm. 8.7 knots, 5 gph.

NOTE: Fuel consumption increased roughly 40 percent between 8 knots and
8.7 knots, accomplishing less than a 10% increase in SOG.

********
1375 rpm. 9 knots, 7.4 gph

Note: Fuel consumption increased roughly 50% to achieve about a 4-5%
increase in SOG

******
1500 rpm. 10.2 knots, 10 gph (roughly 1 nmpg)

Note: Fuel consuption about 35-40% higher than at 1375 rpm, but better
than a 10% increase in SOG

******

1700 rpm, 11 knots, 14 gph.

Note: once again about a 40% increase in fuel burn to realize less than
a 10% increase in speed.

**********

2150 rpm, WOT, 14.6 knots, 27 gph,

Note: Almost 100% increase in fuel consumption from a 1700 rpm cruise,
but only about a 33% increase in SOG

thats some pretty interesting findings, Chuck

My brother wonders why I don't max. out my little 4 cyl. Chris Craft. I
usually run it at 31-3200 RPM Plane speed +. Instead of WFO at
4-4200.

For the wear and tear, and fuel consumption, you really don't gain a
whole lot. The performance doesn't outweigh the benefit of over all
economy.

Tim

Reply With Quote

Reply With Quote

Thread Tools	Search this Thread
Show Printable Version	Search this Thread: Advanced Search
Display Modes
Switch to Linear Mode Switch to Hybrid Mode Threaded Mode

Posting Rules
Smilies are On [IMG] code is Off HTML code is Off Trackbacks are On Pingbacks are On Refbacks are On

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
(non-political) comments on fuel economy and technology	[email protected]	General	28	February 5th 06 10:22 PM
Grist for the discussion mill....(long)...	[email protected]	General	3	January 24th 06 04:17 AM
So where is......................	JimH	General	186	November 28th 05 02:29 PM
Help with fuel consumption?	Bill Kiene	General	4	November 11th 05 04:44 PM
Gas Hog Cars, same phenomenon as boats	[email protected]	General	19	November 10th 05 07:56 PM

All times are GMT +1. The time now is 11:28 PM.

About Us

"It's about Boats"

Contact Us BoatBanter Home Privacy Statement

Copyright © 2017