Questions on a 25 Ranger

F

FGRVONROTH

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Jun 2, 2007
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C Dory Year
2007
C Dory Model
R-25 Tug
Vessel Name
BUSTER
I just bought a 25 Ranger (hull number 2427) with a 110 Yanmar engine and have a few questions about her. I would like to know..

What is the expected top speed?
What would be the best cruising speed?
What should be the engines top rpm be?

Thank you very much and if anyone has any advice to give to a new Ranger tug owner it would be much appreciated!

Thanks again!
Dick von Roth
 
Dick, you're a brave man to buy such a boat without knowing those things! :shock: I'm sure you won't be disappointed in any of the answers though I could only guess. There are several folks on here that have them that can give you good ones.

Congratulations on the new boat!

Charlie
 
You want to book mark this page:
http://www.yanmarmarine.com/products/pd ... chData.pdf

That is the tech data for your JH/4JH4 HTE 110 hp diesel. This gives max rated hp at 3200 RPM. The max torque is at 2000 RPM. Some say you don't want to run a diesel at more than 85% of max RPM--or 2700 to 2800 RPM. Some say max RPM minus 200 RPM. At 2800, according to the spec sheet, you are burning 4 gallons an hour, and will be close to 70 hp prop output. At 3000 RPM you are developing 90 hp prop output and burning just under 5 gallons an hour.

In Oct I did some runs on a light C Ranger 25 with the 125 hp engine:

Note speed in statuate miles per hour vs nautical miles an hour.

Idle (650 RPM) 3.1 Miles an hour 2.7 knots
1000 RPM 4 Miles an hour 3.5 knots
1600 RPM 6.5 Miles an hour 5.7 knots
2000 RPM 7.5 Miles an hour 6.5 knots
2500 RPM 8.8 Miles an hour 7.7 knots
3000 RPM 11.2 Miles an hour 9.7 knots
3200 RPM 13.2 Miles an hour 11.4 knots
3400 RPM 14.5 Miles an hour 12.6 knots
3600 RPM 16 miles an hour 13.9 knots
3800 RPM 17.5 Miles an hour 15.2 knots

The spec curves on the two engines are significantly different--but the 125 hp engine developes 70 hp at about 3000 RPM.

I would expect slightly less speed with the 110 hp engine--but I personally would consder it an 8 to 10 knot boat for practical purposes.

I am sure that owners of the 110 hp engine will jump in with their experiences once the boat is loaded for cruising.
 
Hi - welcome aboard. I do think there may be a digit or two slip there with your hull number because although I do hope there is a hull number 2427, it will be over 25 years in the future at any reasonable build rate for the factory.

I have hull number 15 with the Yanmar 110. Loaded for cruising with two aboard, the top speed is about 14.5 knots. At 2600 RPM, I'm seeing about 8.5 knots and think that's a comfortable cruising speed. 2800 RPM gets it close to 10 knots. Not enough data yet to compute fuel consumption at various RPM's but the as Thataway says, the Yanmar site has charts. Early data would suggest that about 2 1/2 gallons per hour on average is what it will be but I'm still in the less than 50 hour burn-in stage and running it at widely varying RPM's. Yanmar says 3200 RPM max, mine is a smidge less than that - could be instrument error.

It's hard to say what you should be looking out for. The early ones including mine have had problems which the factory and/or dealer have fixed and hopefully most of those problems will not happen in the later boats. The factory is on a steep learning curve but they certainly seem to be trying to learn from what isn't working and correct it.

Read the comments about the Ranger 25 on this site and you'll get some suggestions as to what to expect.
 
The Mrs Dee seems to fit right into the figures above. I now have the boat on a small lake in Montana. At an altitude of about 3300 ft. I seem to have lost a little top speed, plus fresh water is a little denser. I suppose it is tuned for Sea level. The lake is only 5 miles long, but it gives me a chance to play with the electronics. I want to route the loop around the lake and see if it will follow close enough to not touch the helm. !st Mate and I made the loop last night and had cheese and crackers with a bottle of good wine.
I think my neighbors think I am nuts having a boat like the Mrs Dee on a little lake. Boating is boating, beats working.
Capt D
 
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