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SEdowneast
Joined: 02 Apr 2025 Posts: 6 City/Region: Lake Murray
State or Province: SC
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Posted: Sun Jul 06, 2025 1:46 pm Post subject: Need Help with Venture 23 Boat Lift Bunk Specs/Hull Deadrise |
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Hello Everyone, well I guess I will be part of the group in earnest soon, as we’ve just ordered a new Venture 23. Very excited about the adventures ahead!!
I will need to get my boat lift bunks built for the new boat and am looking for the specs for them. If anyone with a Venture 23 could help, it would really be appreciated.
I am specifically looking for the deadrise angles for the hull at the stern and the angle of the hull directly below the front of the midship cleat. The “level” tab of the “Measure” app on an iphone can be used to take angle measurements.
I am also looking for the centerline distance between the bunks if someone has those….or, even the same measurement of the back bunks of a trailer that has been set up specifically for a Venture 23.
Look forward to being active with the group in the future!
Thanks so much!! |
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Tom Hruby
Joined: 11 Nov 2023 Posts: 143 City/Region: Lacey
State or Province: WA
C-Dory Year: 2024
C-Dory Model: 22 Cruiser
Vessel Name: WATT NOW
Photos: WATT NOW
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Posted: Sun Jul 06, 2025 4:11 pm Post subject: |
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Have you tried contacting NMI (Northwest Marine Industries) that is building your boat? I am sure they have all these technical specs since they set up the trailers for these boats as well. |
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SEdowneast
Joined: 02 Apr 2025 Posts: 6 City/Region: Lake Murray
State or Province: SC
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Posted: Sun Jul 06, 2025 5:52 pm Post subject: |
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I have asked the questions via the dealer but haven’t gotten a response yet. I think they are quite busy these days! Thinking someone on here might have already been down this road, this my post. Thanks! |
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thataway
Joined: 02 Nov 2003 Posts: 21520 City/Region: Pensacola
State or Province: FL
C-Dory Year: 2007
C-Dory Model: 25 Cruiser
Vessel Name: thataway
Photos: Thataway
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Posted: Sun Jul 06, 2025 7:07 pm Post subject: |
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Interesting questions: are you going to change the angle of the boat surface (upper surface), by the angle of the deadrise of the various stations in the hull. I am not sure I have ever seen that done. Certainly now many of the lifts are fitted for the deadrise aft--this is especially important in high dead rise boats, such as Contender (up to 26* at the transom.
I have a 25 year old lift, which I have put boats from flat botton, minimal dead rise, a 27' boat with 18* deadrise, a several 20 foot boats with 18 to 20 degree deadrise at the transom, and two different catamarans on--all the same: two 2X10 true dimensional salt water treaded timbers on each side. They have remained the disance apart most of the time--and that was for 8' beam catamarans. I would have had to build (custom wood work, which I would do my self with a power planer) for each boat doing that. No ill effects on any of those boats from the way the bunks were set. _________________ Bob Austin
Thataway
Thataway (Ex Seaweed) 2007 25 C Dory May 2018 to Oct. 2021
Thisaway 2006 22' CDory November 2011 to May 2018
Caracal 18 140 Suzuki 2007 to present
Thataway TomCat 255 150 Suzukis June 2006 thru August 2011
C Pelican; 1992, 22 Cruiser, 2002 thru 2006
Frequent Sea; 2003 C D 25, 2007 thru 2009
KA6PKB
Home port: Pensacola FL |
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SEdowneast
Joined: 02 Apr 2025 Posts: 6 City/Region: Lake Murray
State or Province: SC
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Posted: Mon Jul 07, 2025 6:17 am Post subject: |
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Well since the deadrise of this boat progresses from somewhat flat, say 6 degrees at the stern, to much more towards the bow, I generally bevel the edges of the wood bunks to similar angles. By doing so the boat will sit flat and is fully supported by the entire portion of the edge not just maybe a corner of the wood bunk. It’s not hard to do if you know what angles to start with and finish. Additionally, you can look at the trailer bunks to see where the increase in angle begins as you move forward. Of course on most boats the stern Deadrise is carried all the way forward, but not on C Dorys, thus the information request. Thanks! |
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thataway
Joined: 02 Nov 2003 Posts: 21520 City/Region: Pensacola
State or Province: FL
C-Dory Year: 2007
C-Dory Model: 25 Cruiser
Vessel Name: thataway
Photos: Thataway
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Posted: Mon Jul 07, 2025 11:17 am Post subject: |
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If you have the skills to do what you propose, then go for it. Hopefuly you have a power planer, or even a good draw knief and long planes. Even the extreme deep "V" boat have variable deadrise. The early C Dory had flat bottoms. Many boat trailers have the bunk boards flat, but they articulate and then they twist and presume the proper angles, Forward bunks resume the proper angle, as their mount moves. One could do the lift bunks the same way, but that might bring the bunks higher. How much water under your lift? You want enough so you can float the boat off in even the extreme low tides.
I see lots of new boat trailers, which have a constant deadrise built into the lumber set on edge, but it is not variable. So there is compromise. The most weight of most small outboard powered boats is concentrated at the stern. So these trailers concentate on the stern deadrise. (Where the "deadrise" is measured in the "specs" on boats is noted.) |
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DayBreak
Joined: 16 Jul 2017 Posts: 1035 City/Region: Monmouth, Or.
State or Province: OR
C-Dory Year: 2018
C-Dory Model: 23 Venture
Vessel Name: DayBreak
Photos: DayBreak
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Posted: Mon Jul 07, 2025 11:49 am Post subject: |
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SEdowneast, I think I can help with those measurements. PM sent. _________________ Gary F
DayBreak, 23 Venture, 2018 - present |
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DayBreak
Joined: 16 Jul 2017 Posts: 1035 City/Region: Monmouth, Or.
State or Province: OR
C-Dory Year: 2018
C-Dory Model: 23 Venture
Vessel Name: DayBreak
Photos: DayBreak
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Posted: Mon Jul 07, 2025 1:07 pm Post subject: |
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....or if this helps...The bottom bunks are 12' x 6 " and separated 32" apart at the transom, having a 4 degree deadrise. The bottom of the hull remain totally flat at 0 degrees up to about 7' where the angle increases in about 1 degree increments up to about 4 degrees at the end of the 12' bunk. These measurements were taken with my iPhone. Hope this helps and congratulations on the purchase of your new 23 C-Dory Venture and joining the group. |
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SEdowneast
Joined: 02 Apr 2025 Posts: 6 City/Region: Lake Murray
State or Province: SC
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Posted: Mon Jul 07, 2025 4:51 pm Post subject: |
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Such great folks and valuable insight on this forum!! So appreciate it!
For my boat lift I will basically rip the bunk boards with a circular saw at the required angles. The boards stand up attached to the beam brackets. Not really hard to do as long as you know what angles to cut. |
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thataway
Joined: 02 Nov 2003 Posts: 21520 City/Region: Pensacola
State or Province: FL
C-Dory Year: 2007
C-Dory Model: 25 Cruiser
Vessel Name: thataway
Photos: Thataway
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Posted: Tue Jul 08, 2025 7:27 pm Post subject: |
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How can you vary the angle of cut of the boards on a table saw? I guess it might be easier with a radial arm saw, but ripping with a radial arm is above my pay grade. --maybe the rough angle, but a power plane or draw knife/long plane is a better solution. Are you going to rip at a single angle, or vary as the boat's deadrise varies? If at the same angle all along the board, then the ripping is the best way.
Daybreak, is the deadrise 4* at the transom, and then transits to 0* a bit further along the botton? If so, the bottom has been distorted from the original manufacture?? Or am I miss reading what you posted. I was under the impression that the deadrise of the Venture boats was greater than the 22, and that was the reason it ran better into chop.
We know that the 23 has more deadrise than the C Dory 22. In the past I have measured the deadrise of the C Dory 22 at 2 to 3 degrees, running about the same until it gradually increases near the helm area. My own posts are the ones on deadrise in other places on the internet, and I had not measured the deadrise at variable stations. |
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DayBreak
Joined: 16 Jul 2017 Posts: 1035 City/Region: Monmouth, Or.
State or Province: OR
C-Dory Year: 2018
C-Dory Model: 23 Venture
Vessel Name: DayBreak
Photos: DayBreak
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Posted: Wed Jul 09, 2025 12:46 am Post subject: |
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thataway wrote: |
Daybreak, is the deadrise 4* at the transom, and then transits to 0* a bit further along the botton? If so, the bottom has been distorted from the original manufacture?? Or am I miss reading what you posted. I was under the impression that the deadrise of the Venture boats was greater than the 22, and that was the reason it ran better into chop.
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Hi Bob,
The degree measurements I was referring to was only pertaining to the surface area of the bottom of the hull as it rested on the 12 ft. long 2 x 6 carpeted bunk. The 4 degree deadrise was measured while I was sitting on the concrete floor at the transom looking forward and this applied to the angle of the hull surface resting on the bunk. The next measurement was taken at the same elevation but on the starboard side of the boat. From the transom end forward, to about the 7 ft. mark, the bunk was relatively flat in relation to the boat resting on the bunk and being perpendicular to the concrete floor. At about 8 ft. forward from the transom end of the bunk, the bunk angle started raising away from the concrete floor in about 1 degree increments for every ft. of travel until it reached the 12 ft. mark and the end of bunk. At 12 ft. I measured the angle to be about 4 degrees in relation to rising up and away from the concrete floor. Keep in mind that I made these measurements for a small area of the boat as it rested on the trailer, behind the midship cleat to help SEdowneast with his original question. Hope this helps. Thanks Bob. |
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SEdowneast
Joined: 02 Apr 2025 Posts: 6 City/Region: Lake Murray
State or Province: SC
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Posted: Wed Jul 09, 2025 8:19 am Post subject: |
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Thataway, I use a circular saw and do the ripping of the board as its laying on its side. The saw can be adjusted for angle of cut and has a gauge so you know what the angles are. Of course the blade is 90 degrees when straight up but the angle decreases as the blade lays down and the base sitting on the board remains flat against the wood. I’ve done this multiple times for different bunks for different boats. It’s probably +/- a few degrees, but you can sand the edge down to get the angle exact angle you’re looking for.
So on Gary’s measurements, I take it to mean that the dead rise of the hull at the stern is 4 degrees with it starting to progress at 7 feet and ending up at 8 degrees at the end of the trailer bunk. I will say I expected it to be 6 degrees at the stern and progressing to about 10-12 degrees. But I’ve never taken the measurements. Thankfully Gary was kind enough to do this. |
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