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Old 01-07-2022, 05:57 PM   #1
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What does S/D at 8kts look like?

Anyone have a video of a Fleming at 8kts? Or any other similar S/D at 8kts?
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Old 01-07-2022, 07:13 PM   #2
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No video... but my 40 with a 34 WLL throws a big enough wake at 6.5 knots that slowing down a bit is required to not upset marina dwellers.

The WLL is what determines speed and wake.
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Old 01-07-2022, 07:28 PM   #3
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No video but I can tell you that any SD boat over 40' is bow level at 8 knots.
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Old 01-07-2022, 08:29 PM   #4
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Couple pics of 56’ waterline x 16.5 beam. 61 tons disp. at 8 knots 6 gph and 10 kts. About 3 times the gphClick image for larger version

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Old 01-07-2022, 08:42 PM   #5
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Our boat is variously described as full and semi-displacement. The hull is round and deep with no hard chines, but it flattens a bit toward the stern. (Drawing on the left is amidship and on the right is basically the transom.) The video is us arriving in Chattanooga as we completed the northern half of the Loop. We’re running at hull speed the first 40 second or so of the video, if that’s helpful.

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Old 01-07-2022, 08:43 PM   #6
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You can watch Tony Flemmings great videos on You Tube. Well worth checking out.

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Old 01-07-2022, 08:44 PM   #7
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Quote:
Originally Posted by phillippeterson View Post
Anyone have a video of a Fleming at 8kts? Or any other similar S/D at 8kts?
What is it you are trying to see? Wake? Or what life is like at 8 knots?
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Old 01-07-2022, 10:24 PM   #8
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Quote:
Originally Posted by psneeld View Post
No video... but my 40 with a 34 WLL throws a big enough wake at 6.5 knots that slowing down a bit is required to not upset marina dwellers.

The WLL is what determines speed and wake.
Quote:
Originally Posted by ksanders View Post
No video but I can tell you that any SD boat over 40' is bow level at 8 knots.
Quote:
Originally Posted by FWT View Post
What is it you are trying to see? Wake? Or what life is like at 8 knots?
Hi, I was thinking wake. But, now that you mention it, what is life like?

This thread could be dead real soon or it could get interesting.

It seems like 8 knots is a good speed for a lot of boats, even a Fleming
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Old 01-07-2022, 10:30 PM   #9
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How a boat behaves at 8 kts will depend a lot on its length. For my 38 footer (33.5 waterline), 8 kts is plowing water, making a big wake, etc. 6.5 or a hair more is a much better speed for slow cruise. A good SD hull may be able to go a little faster before hitting the wall (mine is a planing hull), but not necessarily.
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Old 01-07-2022, 10:30 PM   #10
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Quote:
Originally Posted by phillippeterson View Post

It seems like 8 knots is a good speed for a lot of boats, even a Fleming
I'm with psneed. If you're not planing, it's all about WLL.

8 knots is a great speed for a 64' LWL boat.
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Old 01-07-2022, 10:39 PM   #11
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Quote:
Originally Posted by trawlercap View Post
Couple pics of 56’ waterline x 16.5 beam. 61 tons disp. at 8 knots 6 gph and 10 kts. About 3 times the gphAttachment 124614

Attachment 124615
Trawlercap,
Your boat is FD.
Extremely over driven in top pic.

Ask Codger2 for a picture of his 34 Halvorsen at 8.5 knots.
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Old 01-07-2022, 10:56 PM   #12
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Quote:
Originally Posted by Nomad Willy View Post
Trawlercap,
Your boat is FD.
Extremely over driven in top pic.

Ask Codger2 for a picture of his 34 Halvorsen at 8.5 knots.
Yes 10 knots is top end for that boat.
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Old 01-07-2022, 11:17 PM   #13
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If someone will lend me a Fleming for a few months I'll take all the video you want.

Here's our CHB 41's wake at about 8kts
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Old 01-08-2022, 03:10 AM   #14
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Sorry no video

but two photo of our Long-Cours 62 at 11.6 kts
32T, 60' Lwl, 16'4" beam, 14'8" beam at wl
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Old 01-08-2022, 09:01 AM   #15
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Quote:
Originally Posted by phillippeterson View Post
Hi, I was thinking wake. But, now that you mention it, what is life like?

This thread could be dead real soon or it could get interesting.

It seems like 8 knots is a good speed for a lot of boats, even a Fleming
Because I have a Helmsman 38 on order, as you might imagine I have collected some clip links as I shopped. The one below shows life at 7 knots under the eye of a training captain. At one point one can see the 7 knot speed on the chart plotter. At this speed one has time to think, assess, react.



Below are a few promo videos that appear to be filmed at 7-8 knots.





This is a smaller boat than what you are asking about but perhaps it might be helpful.
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Old 01-08-2022, 10:15 AM   #16
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A screenshot. GB 46, 44'dwl. 12kts. CAT 3208 x 2, 2083rpm. 16.8gph total
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Old 01-08-2022, 11:09 AM   #17
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A screenshot. GB 46, 44'dwl. 12kts. CAT 3208 x 2, 2083rpm. 16.8gph total

That looks almost like a planing wake to me.

For comparison, the pictures below show my boat's wake at 5.5, 6.5, and 17 kts.
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Old 01-08-2022, 11:55 AM   #18
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rslifkin At 12kts it is almost planing. I think I was surfing a bit in that shot. It's a screen shot taken from a video clip.

I don't know how to post videos to the forum.
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Old 01-08-2022, 11:58 AM   #19
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These are all awesome. More. More.
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Old 01-10-2022, 03:30 PM   #20
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H38E Video

[QUOTE=FWT;1066437]Because I have a Helmsman 38 on order, as you might imagine I have collected some clip links as I shopped. The one below shows life at 7 knots under the eye of a training captain. At one point one can see the 7 knot speed on the chart plotter. At this speed one has time to think, assess, react.

Nice looking H38E videos, I like the one filmed in San Diego, looks a little familiar.

John T. - N4050, N4061, N3522, H38E former owner

Marshall Marine Sandpiper - current owner
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