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  Slow prop for trolling?

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Author Topic:   Slow prop for trolling?
Hoop posted 05-14-2001 11:55 PM ET (US)   Profile for Hoop   Send Email to Hoop  
Would it be practical to get a different prop specifically for slowing down to troll? An aluminum 14 x 17 prop pushes me in idle at about 3 mph on my Evinrude 70 hp four stroke. Though admittedly there is a risk of overrevving the engine, what prop would cut the idle speed in half?
Hoop
Tom W Clark posted 05-15-2001 12:03 AM ET (US)     Profile for Tom W Clark  Send Email to Tom W Clark     
Hoop,

You would have to have an extremely low pitch to drop your dead slow speed to 1.5 mph though you could try just breaking off two of the three blades on your current prop. But I think the best solution is a trolling motor. A 6 hp would do nicely. Or you could try a trolling plate to block the prop wash or do as many a fisherman around here do and throw a five gallon bucket or two overboard on the end of a line.

lhg posted 05-15-2001 02:46 AM ET (US)     Profile for lhg    
Most outboards are supposed to idle at 600 rpm in gear. That should give you a trolling speed of around 1.5 - 2.0 mph. Prop pitch means little at those speeds. Maybe your idle is set too high. What about other Montauk owners with 4 strokes?

I can troll my Outrages down to about 1.5 - 1.8 with either a Merc 115 or 200!

triblet posted 05-15-2001 10:17 AM ET (US)     Profile for triblet  Send Email to triblet     
My Evinrude 90HP two-stroke idles at about
three knots with two divers and gear.

A prop short enough to idle at 1.5 knots
would cut your top speed in half.

Hey Hoop, maybe we can have an idling contest
at the rendezvous this weekend. Slowest idle
wins. No kickers, no buckets. ;-)


Chuck

andygere posted 05-15-2001 12:07 PM ET (US)     Profile for andygere  Send Email to andygere     
Hoop,
Have you tried trimming your motor up a bit to a less efficient prop angle? I've managed to slow my 85 hp down to about 2.5 mph with a big load and the same prop. Also, trolling into the wind seems to help a little. I guess I just gave away my secret tricks for the slow troll contest....
Hoop posted 05-15-2001 10:39 PM ET (US)     Profile for Hoop  Send Email to Hoop     
Thanks everybody. I like the trolling speed contest! And Andy, good idea to trim up a bit. That with a 5 gallon bucket, maybe!

Trolling motor ... yeah. But I figure I'ld use it so little that I'ld rather investigate all other options.

I'm looking forward to this weekend.

Hoop

Tsuriki BW posted 05-15-2001 10:56 PM ET (US)     Profile for Tsuriki BW  Send Email to Tsuriki BW     
Hoop

I am installng a "Happy Troller" plate on the75hp Merc on my Dauntless 14. Trolls too fast now and the stern electric is only good for fresh water. The plate should slow things down well.

Tsuriki

Tsuriki BW posted 05-15-2001 11:18 PM ET (US)     Profile for Tsuriki BW  Send Email to Tsuriki BW     
Hoop

I am installng a "Happy Troller" plate on the75hp Merc on my Dauntless 14. Trolls too fast now and the stern electric is only good for fresh water. The plate should slow things down well.

Tsuriki

jimh posted 05-16-2001 12:40 AM ET (US)     Profile for jimh  Send Email to jimh     
About five years ago I had a chance to go aboard the _Laurentian_, a research vessel operating in the Great Lakes. They often need to operate at low speeds while trawling or making bottom survey runs. Their diesel engine doesn't like to idle much below 1000 rpm, otherwise the oil pressure can be a problem. So they use a variable pitch prop, which they back down to a low pitch and can troll all day at 1.0 knots.

I read somewhere that Mercury was experimenting with an outboard engine with a variable pitch (remotely controlled) prop.

See http://continuouswave.com/boats/laurentian/

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