inflated fuel/ gph figures

[tomcat rio]

from a boats.com ad for a 99 28 te with a 300 hp yanmar.
seems a bit optomistic to me, anyway. (17 kts @ 5 gph?)

"Description

This is traditional, all-weather "Downeast" design at its best. With wide side decks, and a large cockpit, Albin's 28TE is a rock-solid performer, and attractive to boot. Her fuel-efficient 300HP Yanmar, hitting 17 knots at 3,200 RPM, uses just five gallons per hour, and gives her a 300-mile range on two-thirds of a tank. Fish from her (she has rod holders and tackle drawers) or just cruise in comfort (she has reverse cycle air conditioning, an enclosed head/shower compartment, refrigeration and a microwave). Either way, you won't be disappointed."

[chiefrcd]

I just wrote these down last week, this is with a clean bottom and running gear:

1999 Albin 28 TE Yanmar 6lp300STE

Information from Flow Scan

I'm burning 7 gals. a hour at 16 mph at 2650 rpms....and 10 gal a hour at 20 mph at 3250 rpms....just checked it today with my flow scan.

[jcollins]

TC,
Could be for a yearly average.
This is a quote from yours last year "so it looks like about 300/84= 3.7 gph avg or so.

Mine was 3.9 if I recall.

[tomcat rio]

new engine (310 peninsular) last year and consumed a little over 400 gal.(about $1300.00).
flow scan indicates about 16 kts at just under 10 gph, on average or maybe 1.5 to 1.6 nmi/gal at cruise (2900 rpm). it looks like the yanmars get about 2.0 nmi/gal. not sure what best cruise rmp is for them. i'm guessing 3200.
thanks for the numbers, chiefrcd.

[Mariner]

I'm sure the speed is a maximum, and the gph is a yearly average as per the seller.

[tomcat rio]

.."2/3 of a tank".

[muscrat]

if anyone is interested for comparison, I have a Cummins 315 in my 1996 28 and I just logged about 20 hours, almost all at my normal cruise speed of 20 knots, and averaged 2 NMPG..

[jcollins]

if anyone is interested for comparison, I have a Cummins 315 in my 1996 28 and I just logged about 20 hours, almost all at my normal cruise speed of 20 knots, and averaged 2 NMPG..

Muscrat,
What RPM are you turning at 20 knots?

Just curious

[muscrat]

John

2400 RPM- michigan DQX 18X19 prop, Hurth hsw 800 1.4-1 transmission in it.

20 knots is full fuel, and way too much stuff.. I also go by EGT guage as much as RPM.. 2400 is the sweet spot for mileage/speed.


Steve

[jcollins]

John

2400 RPM- michigan DQX 18X19 prop, Hurth hsw 800 1.4-1 transmission in it.

20 knots is full fuel, and way too much stuff.. I also go by EGT guage as much as RPM.. 2400 is the sweet spot for mileage/speed.


Steve

Interesting. I filled up this morning. Just under 2900 RPM for 20 knots. 3000 gave me 22 knots. I have a Nibral 18x18. Forgot the transmission. Same as Denis' Red Stripe.

[muscrat]

John
"redline" on my Cummins is 2800. I have it conservatively propped so it will run up to 2875-2900 with full load and clean bottom. Prop is a four blade, the only thing I don't remember is how much cup is in the prop. If interested I can look that up.

Steve

[Sisu22]

Ressurecting an old thread here, but does anyone know how the lower HP Cummins do for fuel economy at hull speeds (around 7kts I'd assume)?

[jcollins]

Ressurecting an old thread here, but does anyone know how the lower HP Cummins do for fuel economy at hull speeds (around 7kts I'd assume)?

Sorry. Can't help with that. Try using the search function. Might be something out there.

[Sisu22]

Yeah I was looking around but could not find anything really on the low speed Cummins numbers. Since they are a much different motor not sure if they have a big difference on low RPM consumption.