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Old 10-27-2018, 11:44 PM   #41
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What motor do you have?

Hi Larry
(Started the stanchion project today. Well send pictures)

What motor do you have? What rpm to get to 7.5? To 8.0? I have the tmd31a and do about 6.2 At 3200....

-p

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This is my boat at 8.7 knots. You can’t see that it has a swim platform because it’s inder water, acting like a giant trim tab. Maybe on the perfect day with a perfect bottom, I might be able to touch 9 knots. Most comfortable cruise for us is 7.2-7.5 knots. She begins squating at 8.

The orange Manatee above on the Tombigbee is Ted & Sarah Pongracz aboard the most travelled Mana-Tee, currently on their 29th loop.
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Old 10-28-2018, 08:38 AM   #42
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R I P Sewanee, I guess that make three out of the 99 that are gone.
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Old 10-28-2018, 08:45 AM   #43
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So sad, wonder how many manatee's are left or how many have sunk or destroyed by fire. i would guess there are 75 left.
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Old 11-05-2018, 06:53 PM   #44
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Hi Larry
(Started the stanchion project today. Well send pictures)

What motor do you have? What rpm to get to 7.5? To 8.0? I have the tmd31a and do about 6.2 At 3200....

-p
My boat has a Yanmar 140. 7.5 @ 2550-2600. 8.0 @ 2900. For 6.2 @ 3200, you must be a bit under prop’d or a very dirty bottom. The orginal independent test of the KK Manatee indicated 7.5 as the top speed, but Jim Krogen claimed it was 8.5 with the TAMD 31 90 HP. The max I’ve ever reached in both directions, right out of the yard with new bottom paint was 8.8 @ 3600.
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Old 11-05-2018, 07:42 PM   #45
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ftbinc.......do you really run your motor at 3200 rpm? if so larry is correct, something is amiss.. i have a volvo tmd 31a and get 6.8 at 2650 rpm on my manatee. cruising speed shouldn't much more than that..
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Old 11-05-2018, 08:54 PM   #46
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So sad, wonder how many manatee's are left or how many have sunk or destroyed by fire. i would guess there are 75 left.
A decent Manatee data base is still kept, and the great majority of Manatee builds are still accounted for. Five have sunk in storms that I know of and three of those have been salvaged and are back on the water. One burned in a marina fire, and recently, two others were lost to hurricanes. The ones in Taiwan and Hong Kong have changed owners in the last few years so we think they are OK too. Owners continue to refit them when needed. I think the number of hulls remaining is still over 90.
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Old 11-09-2018, 03:39 PM   #47
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I just ran across Manatee on the Illinois River and thought of this thread. Looks like they're still looping!


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Old 11-09-2018, 05:25 PM   #48
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What a guide book they could write.
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Old 11-09-2018, 06:43 PM   #49
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What prop are you running? My gut is is we are well under propped. I hae looked on the prop for a spec, but can't seem to find one. I am going to look hard again. Not sure why anyone would under prop a Manatee.

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ftbinc.......do you really run your motor at 3200 rpm? if so larry is correct, something is amiss.. i have a volvo tmd 31a and get 6.8 at 2650 rpm on my manatee. cruising speed shouldn't much more than that..
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Old 11-09-2018, 06:45 PM   #50
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We spent a great evening with Sarah and Ted a week ago in Waukegan IL. They are great fun!

Great pics of them in Peoria.
-p
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I just ran across Manatee on the Illinois River and thought of this thread. Looks like they're still looping!


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Old 11-15-2018, 10:18 PM   #51
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What prop are you running? My gut is is we are well under propped. I hae looked on the prop for a spec, but can't seem to find one. I am going to look hard again. Not sure why anyone would under prop a Manatee.
Original props reported on most Manatees were 22 x 13 LH, but many owners including Mango Mama went larger diameter and/or pitch. Mine is still stamped 22 x 13 but I suspect it has been repitched to 14 deep. Mango Mama is currently turning a 22 x 16 and has the same Yanmar 140 refit and same ratio tranny, but with the drag of stabilizer fins, deeper keel and articulated rudder, he reports 1/2 knot slower 2100 RPM. He’s taking a much bigger bite with the extra pitch, but I think he might be cavitating over 2000.

The biggest prop I ever heard of on a Manatee with an original Volvo was a 24 x 12 on a dock queen in Hong Kong. The broker noted that the boat ran fine but that soot buildup in the transom was persistent. I asked if the engine was able to reach it’s 3600 RPM max, and he responded “almost”. I guess I shouldn’t expect more detail than that from a selling broker.

Frankly, I think the original 22 x 13 LH prop is the right spec for the 90, 100, and 110 HP Volvos.
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Old 11-16-2018, 08:08 AM   #52
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I have the propeller build sheet. That and a faded out electrical sheet was on the boat when we bought it. I calculated diameter at 22.08” and pitch 13.04”, my Manatee TMD31A likes the prop size. As you can see on the sheet a PO tried to convert millimeters to inches but miscalculated. I’d have to go to the boat to look at the sheet closeup but LH rotation and I think 3 3/4” boss along with a lot of metric information a propeller shop might need if they built or tuned one.
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Old 11-16-2018, 07:48 PM   #53
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Nice piece of documentation, Bill. Never knew this existed outside the Krogen offices.
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