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Old 05-30-2013, 05:44 AM   #21
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Can't be too bad as the lobstermen run those speeds and often have cages.

The cage is no harm at lobster trap working speeds , and the extra fuel burned at get home speeds , only a few percent of the work day.
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Old 06-04-2013, 05:52 PM   #22
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Launched today and did the 3 1/2 hour run from the Yard to our home mooring.

Prop cage does not seem to affect speed. Same rpms give same speeds as previous years.

Ran over a couple of lobster pot buoys on purpose. Wife said I was tempting the Fates.

So far so good.
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Old 06-04-2013, 09:05 PM   #23
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Ran over a couple of lobster pot buoys on purpose. Wife said I was tempting the Fates.
I love it!
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Old 06-04-2013, 09:39 PM   #24
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Now you can cruise in a straight line! Imagine the time and fuel savings!

In the words of Admiral David G. Farragut, "Damn the torpedoes! Full speed ahead!"
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Old 06-04-2013, 11:05 PM   #25
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Old 06-05-2013, 07:28 AM   #26
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Now you can cruise in a straight line!
Am definitely looking forward to that, after all those years of leaving a wake that would break a snake's back.

Of course, most of the other boats around me will still be doing the lobster pot dance, which can get quite interesting in passing and intersecting situations involving multiple boats, including lobster boats hauling traps.
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Old 06-05-2013, 09:56 AM   #27
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Am definitely looking forward to that, after all those years of leaving a wake that would break a snake's back.
David: I'm trying to get my head around the concept of the cage and I understand it prevents trap lines from tangling in the prop. Won't trap lines still tangle on the rudder? ( I know that they are easily removed) I like the idea of not using cutters since they leave the whole trap (& lobsters) on the bottom, never to be recovered. What was your main incentive for building a cage? Prop entanglement? Saving the traps? etc.
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Old 06-05-2013, 03:28 PM   #28
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David: I'm trying to get my head around the concept of the cage and I understand it prevents trap lines from tangling in the prop. Won't trap lines still tangle on the rudder? ( I know that they are easily removed) I like the idea of not using cutters since they leave the whole trap (& lobsters) on the bottom, never to be recovered. What was your main incentive for building a cage? Prop entanglement? Saving the traps? etc.

Walt:

Look again at the photos at the beginning of this thread.

The bottom end of our rudder shaft, unlike your spade type, is connected to the skeg. That in itself is somewhat helpful in avoiding snagging of a line on the rudder. (We used to catch lines too easily on our old boat that had twin spade rudders).

Also, the photos show that there is not much space between the aft end of the cage and the rudder. At any reasonable forward speed, the pot buoy (single or with toggle) is going to see something like photo 4 coming at it. By the time it (they) bounces off the bars we are gone by.

Catching a pot buoy and line (warp) while backing up, or having one insinuate itself in from the rear during a tide/current/wind shift while the boat is anchored or on a mooring, is something to be wary of.

My main reason for the cage was to avoid entanglement, which usually happens, and has happened to us, Murphy-like, at the worst possible time.
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Old 06-05-2013, 04:05 PM   #29
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The bottom end of our rudder shaft, unlike your spade type, is connected to the skeg.
Didnt realize that the IG 32 had a sand shoe. The whole reason for the spade (according to Harvey) was to result in a little more speed. Such, has not been the case with my boat but she does have a little different prop than you have. ( mine is 24.5 X 17.5)
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Old 06-05-2013, 06:01 PM   #30
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Didnt realize that the IG 32 had a sand shoe. The whole reason for the spade (according to Harvey) was to result in a little more speed. Such, has not been the case with my boat but she does have a little different prop than you have. ( mine is 24.5 X 17.5)
Walt: Nice picture juxtaposition of two hulls that are essentially from the same mold but with different running gear and rudder treatment. Our prop is (back to, after a two year trial with a 24 X 20) a 25 X 19.
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Old 06-05-2013, 06:59 PM   #31
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Below 8 knots and you can hang all kinds of things fro the bottom of your boat without appreciable slowing or fuel consumption...at six knots it would be hard to even find on instrumentation.
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Old 06-05-2013, 07:36 PM   #32
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Our prop is (back to, after a two year trial with a 24 X 20) a 25 X 19.
And you can get 2800 with a 25 X 19?
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Old 06-05-2013, 08:01 PM   #33
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And you can get 2800 with a 25 X 19?
We did get that before the cage and got 13.7 kts. Will soon see and report what's what with cage. With the 24 X 22 prop (mistake in previous post) the max rpm was about 2650 and 12.3 (? can't remember exact) kts. The 24 X 22 has now been re-pitched to 24 X 20 and will be kept as a spare.
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Old 06-05-2013, 09:41 PM   #34
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Walt, let's pull that clean prop of yours and and pound another inch or two into its pitch. I'll bring the beer!!
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Old 06-05-2013, 11:11 PM   #35
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Walt, let's pull that clean prop of yours and and pound another inch or two into its pitch. I'll bring the beer!!
I'm almost certain that I can coax another 3 knots out of the boat with a prop change but as I said earlier, I'm getting Cummins recommended 2800rpm now. I'm also used to the 8.4 knots and the sound of the engine at 2000rpm. At 2400 she will go 9.3 knots but look at the fuel flow. Christ! I'm on a fixed income and have to watch mu Ps & Qs!
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Old 06-06-2013, 12:46 AM   #36
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Walt, if you keep it at 1300, the Coot can comfortably keep pace; 1500 if you want to push her. Everyone else exceeds that on their way in the final stretch to home port!
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