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Old 01-09-2016, 11:11 PM   #161
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Al, Thanks for the question, gives me an opportunity to correct my poor presentation. Instead of rough, better word is loud, which makes me unhappy. It also makes my companion, Teddy the Beagle, unhappy. I am reluctant to push the engine beyond 3100. It will go to 3600, but I see no reason to do that. After 2600 the gain in speed is not worth the noise. In addition to my preference, it is a 38 year old engine that spent a long period of time with no to very limited usage. Like its present owner it deserve to slow down and not work to hard, thus preventing unnecessary breakage or failure.

I know a couple of fellow Prairie owners who have the 4-236, they are very fond of these engines, as would I.
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Old 01-09-2016, 11:48 PM   #162
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[QUOTE=Sortie;403043]Al, Thanks for the question, I am reluctant to push the engine beyond 3100. It will go to 3600, but I see no reason to do that. After 2600 the gain in speed is not worth the noise.]

2600 out of a possible 3600 RPM shows a goodly spread. Let me ask, do you have sound barrier on the bottom of your engine (floor?) hatch? Asked as I purchased enough to make three layers of sound insulation matting. I purchased at our local NAPA (Pep Boys, O'railly'). It is use as a heat shield by some, the sound proofing is a bonus. I secured the matting with those nails with the plastic washer thing-a-majiggy. Will take a photo with my phone next day or two and will have to email over this trawler format should you have a problem viewing what I am trying to explain. The end result of this insulation is just unbelievable when you open and then close as your are traveling. If you don't have this and room to apply, consider it.
Thanks for the come back,
Al Marben Pocket CRUISER.
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Old 01-10-2016, 12:02 AM   #163
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Al, Thanks for the suggestion. I do have sound barrier, it is, however, in bad shape. .
John
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Old 01-10-2016, 08:18 PM   #164
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Al Slip Aweigh has a 4.236. I run her around 2000. We seem to reach warp speed of around 6.3 knots. Fuel consumption is below one gallon per hour.
I have run her up to 2650 a couple times. The most I generally run is 2200. This equates to around 6.8. The increase in noise level is not appreciated by either the Mrs or the hound. So the comfort level is 2K or less. I have found trolling speed is around 1500, 4.25 kts, seems to work best, and engine is whispering.

I'm not in a hurry, unless the Grandkids are getting cranky, and then I have to skedaddle back to port. But, they all know that when on Papa's ride it isn't a fast sportscar, but a comfortable mobile couch with an after swim warm shower, toys, and snacks for the trip. Why the heck do I even go home?

And, at some point a PO installed sounddown insulation under the salon deck and on 'most' of the ER side of the bulkhead to the bow.
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Old 01-10-2016, 09:31 PM   #165
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3100rpm WOT on a 4-108 is about as good as it gets.
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Old 01-10-2016, 10:56 PM   #166
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Why the heck do I even go home?
I ask myself that all the time!!!
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Old 01-11-2016, 12:14 AM   #167
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So the comfort level is 2K or less. I have found trolling speed is around 1500, 4.25 kts, seems to work best, and engine is whispering and, at some point a PO installed sounddown insulation under the salon deck and on 'most' of the ER side of the bulkhead to the bow.
Neat!! At 1500 RPM in gear, you now have an idea of my sound level at hull speed 6.8-7.1 Knots+.

Trolling speed for King Salmon is best at 2-2.5 knots. At dead throttle stop of 500 RPM we are at 3.5 knots, too fast, so the 9.9 Yamaha OB is employed.

I mentioned using the heat shield/sound deadening matting that comes in a roll from the local auto parts store. What is the material or stock that your boat is deadened with? It may not be cost effective to add any to our craft were it complicated. The gain over what the engine sound is now may be nil.

Al-Marben Pocket CRUISER
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Old 01-11-2016, 09:05 AM   #168
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I have found, (not just on this little craft, but on many others) that it is not just the sound deadening absorptive insulation on the underside of the deck that is key, but the actual mating surfaces of the hatches, and scuttles on the deck plates that allows much of the noise to filter through. As you walk along the deck does the pitch of the sound change? That is from the hatches lifting, flexing and breaking the seal of the deck frame. To me this is a larger part of the sound deadening success.

If you have all the sound barrier in place its effect is dramatically lessened if it 'leaks' from the hatches anyway. Another issue is warped plywood and chipped edges.

I have not looked carefully at the specific insulation on Slip Aweigh to see a brand name. It is two layers of 5/8" black foam with an orange hard plastic (approx 1/16') layer between the two with aluminum foil on the side toward the engine compartment. It is held on with some adheshive. I have used the glue on studs with the snap on covers you mention. They work well with rockwool panels even on the overhead.

On most boats I have worked on in the past 35 years sound deadening is almost universally appreciated. Even if it helps a 'little bit'!

You have a get home kicker. How much speed do you make with the OB? Can the rudder steer even if the OB is behind the rudder? Is the OB on the centerline?
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Old 01-11-2016, 09:52 AM   #169
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Cappy,
I agree. There's path for engine sound right near my throttle lever ... I don't see it but but the sound comes right up there. And I remember riding on the old Wn State ferries. On some of them the windows would rattle. Dozens or more windows rattling away made quite a racket. Sounded like a bunch of kids hitting the furniture w sticks. Willy also has a rather heavy sounding rattle in the lazerette that I've never found. Must be in the inassesable space behind the port water tank. Bulkheads can "drum" and of course there's dishes .. or that tea kettle on the stove.
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Old 01-11-2016, 10:41 AM   #170
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Cappy,
I agree. There's path for engine sound right near my throttle lever ... I don't see it but but the sound comes right up there.
Eric,

I had the same sound until I figured out that it was coming through a tube connecting the engine compartment to the control console that contains wiring and control cables. It was also 'leaking' noise into the pilothouse where the tube passed through the deck. I sealed it there and inserted foam rubber into the upper end of the tube and voila, no more noise . . . OK, less noise

Cappy,

I totally agree. After installing Soundown insulation throughout the engine compartment, I discovered there was still a tremendous amount of noise coming from around the hatch. I removed it, trued the mating surfaces and installed Taco Hatch Sealing Tape. It worked wonders

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Old 01-11-2016, 01:41 PM   #171
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Eric,

I had the same sound until I figured out that it was coming through a tube connecting the engine compartment to the control console that contains wiring and control cables. It was also 'leaking' noise into the pilothouse where the tube passed through the deck. I sealed it there and inserted foam rubber into the upper end of the tube and voila, no more noise . . . OK, less noise

Cappy,

I totally agree. After installing Soundown insulation throughout the engine compartment, I discovered there was still a tremendous amount of noise coming from around the hatch. I removed it, trued the mating surfaces and installed Taco Hatch Sealing Tape. It worked wonders

I, too, have noticed the sound levels vary as I move about the saloon. The sealing tape on my hatches is just about non-existent. I plan to re-seal the hatches. My only other source is the shift/throttle cables transmitting sound up to the lower helm quadrant. I plan to wrap a bit of this seal tape on the exterior of the cables under the helm to muffle this transmission of high pitched noise.

John - Thanks for the valuable info on your wheel replacement.

-Evan
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Old 01-11-2016, 02:19 PM   #172
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You have a get home kicker. How much speed do you make with the OB? Can the rudder steer even if the OB is behind the rudder? Is the OB on the centerline?
Cappy- I will PM you with information on OB. Could start thread creep.
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Old 01-12-2016, 02:48 PM   #173
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Cappy- I will PM you with information on OB. Could start thread creep.

Al

Well.... It is a 'Prairie engine' of sorts!
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Old 02-26-2016, 07:01 AM   #174
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Cappy: You cruise at 2,000 rpm, right? Well, the P.O. of Rise 'n Shine adjusted the propeller so that I get 7 knots at 1400 rpm. The fuel burn makes me think it's making around 25 horsepower at that speed, which is more than a little rediculous for a 185 hp engine.

But, it's bought and paid for, so I'm going to go with it.

Cheers! ...thinking of spring

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Old 02-26-2016, 07:14 AM   #175
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On Rise 'n Shine the main sound reducing factor is the propeller - the P.O. "overpropped" the unit so I cruise at 7 knots at 1,400 rpm. It's making around 25 hp, I reckon from the fuel burn (which is a little ridiculous for a 180+ horsepower engine) but it works well, and is also a significant fuel savings over running the same engine at 1850 or so rpm with a "correct" (i.e. optimized for maximum power) screw.

So, my attitude is to pop a tab and enjoy it!

Cheers!

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Old 02-26-2016, 10:44 AM   #176
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Driftless,
It ain't ideal but I'd probably do the same w your boat.
I think your "25hp" is very close. My Willard FD takes about 18 as a widely accepted number in the Willard Boat Owners Group (yahoo). My cruise is 2300rpm.
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Old 03-05-2016, 08:38 AM   #177
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@ Driftless:

I do try to keep her at 2K. But if in serious 'get homeitis' mode (crying GrandKids and all) I have run her up to 2700 or so. But, in all honesty, running over 2K is NOISY, and just obnoxious. I'm happy plodding along at 6.5 or so. Autopilot works like a charm, and I only have to watch out for pots, and the errant WAFI coming my way to avoid.
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Old 05-18-2016, 07:35 AM   #178
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Yesterday, as I commissioned Rise 'n Shine for the season, I was averaging 6.2 knots at 1,100 rpm. The coolant temperature leveled out at 150 F. even with the new thermostats. I double checked the temp with an IR heat gun, and the gauge is about right.

The good news is the noise level is very low, and the fuel burn has to be mostly for engine friction rather than moving the boat. Again, it's more than a little overkill, an engine rated for 185 continuous, running at what, around 20 horsepower?

OTOH, it's bought & paid for, so I'll keep 'er going.

Cheers!

JS
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Old 05-18-2016, 08:40 AM   #179
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@driftless: Now that you are all wet, Give me a couple weeks. Have to patch a blister repair I peeled off when stripping bottom last month. Then paint and splash. Have to do a side by side fuel burn check.

By any chance do you know the dia/ pitch of your wheel?
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Old 05-18-2016, 08:45 AM   #180
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Yesterday, as I commissioned Rise 'n Shine for the season, I was averaging 6.2 knots at 1,100 rpm. The coolant temperature leveled out at 150 F. even with the new thermostats. I double checked the temp with an IR heat gun, and the gauge is about right.

The good news is the noise level is very low, and the fuel burn has to be mostly for engine friction rather than moving the boat. Again, it's more than a little overkill, an engine rated for 185 continuous, running at what, around 20 horsepower?

OTOH, it's bought & paid for, so I'll keep 'er going.

Cheers!

JS
I wanna know what happens when you push the power up....like 2200 or 2400rpm. Will it plane out???? As a previous P29 owner, I am just curious and always wondered. It is definitely a semi planing hull. And with that much power, that thing should fly!!!
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