Swim platform question

ian260

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Dec 11, 2023
11
Albin 82MS stafford
Has anyone ever seen or heard of a swim platform with an outboard mounted to it? I know its common on powerboats and was wondering if it's possible for sailboats? I want to put a swim platform/ladder on and feel like it would maximize space to have the outboard mounted to that rather than to a standard outboard bracket. (Example pictured below). Boat is an albin 82MS. Very flat stern all the way down to the water line.
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ian260

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Dec 11, 2023
11
Albin 82MS stafford
I see why it makes sense for a powerboat. But I don't see how it would affect a sailboat? Sailboats generally do not have large engines and are not meant to go on plane. Wouldn't it work the same as a standard bracket in terms of hanging a motor off the stern?
 
Jan 19, 2010
12,543
Hobie 16 & Rhodes 22 Skeeter Charleston
You would need a way to lift your OB. Otherwise, I'd worry that your OB would get swamped on a regular basis.

What if you got a more traditional swim platform and installed a hydrolic motor mount that raised and lowered vertically... and made a cut away in your platform for the OB lower unit....something like this...
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Jan 11, 2014
12,174
Sabre 362 113 Fair Haven, NY
The transom of the sailboat was not designed to support the weight of a swim platform and an out suspended from the platform. To make this work, it would necessary to significantly increase the strength of the transom and tie the transom into the hull structure with some knees.

Once this is done the new transom, swim platform, and out board will have added hundreds of pounds of weight the boat wasn't designed to support. And then you have the already noted issues with the outboard being a place that is hard reach and control as well as the issues of flooding from a following sea.
 
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Oct 26, 2008
6,211
Catalina 320 Barnegat, NJ
I'm not even understanding how that thing is mounted or the orientation. It seems that the ladder is coming off the side? Is the face with the holes the face that gets mounted to the transom? It's a weird assembly in my eyes.
 
Jan 1, 2006
7,358
Slickcraft 26 Sailfish
I'm not even understanding how that thing is mounted or the orientation. It seems that the ladder is coming off the side? Is the face with the holes the face that gets mounted to the transom? It's a weird assembly in my eyes.
I think the side with all the holes is mounted to the transom. There is an access hole so I guess one could get at the fasteners. The side with the upward riser is where the outboard clamps onto. The ladder is lateral or athwartship, sort of speak. I think. Not entirely certain. That swim ladder must articulate, or slide into the mounts because you can't sail with it dangling - ask how I know.
I'll tell you anyway: Our sailing organization had a kind of Sadie Hawkins race day in which the women would take the boats out for a race without the guys. So my wife took my Mark 25 out with a group of girlfriends. They were mostly sailors and I can brag that my wife came back as a more confidant and enthusiastic sailor - all good. I recommend that format for any listers who are struggling with a spouses engagement in sailing.
Problem was that I had cleaned the bottom of the boat for the race, to give her the best chance, but I left the swim ladder down. I was observing the race from a friends boat as were a number of men who had their boat and wife in the race. To my horror I noticed the swim ladder was down. Despite animated gesticulation I could not get my wife's attention to alert her of the problem. She did OK in the race but could have done much better without the ladder. In any event after the race I asked her why she didn't notice the ladder down. Very big mistake!
 

PaulK

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Dec 1, 2009
1,303
Sabre 402 Southport, CT
I'm not even understanding how that thing is mounted or the orientation. It seems that the ladder is coming off the side? Is the face with the holes the face that gets mounted to the transom? It's a weird assembly in my eyes.
The example photo would seem to be for slapping onto the transom of the typical flat-transomed powerboat, perhaps one with inboard engines. A trolling motor might be able to be clamped onto the upright section at the aft end. If there's a motor there, mounting a ladder to the side might be a smart move.
 

jssailem

SBO Weather and Forecasting Forum Jim & John
Oct 22, 2014
22,076
CAL 35 Cruiser #21 moored EVERETT WA
Many things can, have and will be done to sailboat hulls not imagined by the designers.

Adding a transom platform and an outboard is not uncommon thinking. Just be aware of the waters you sail and how your addition may be impacted.

If you sail in open oceans with 20ft breaking waves an attached (bolted on) stern platform maybe vulnerable. Green water breaking over the stern may remove your swim platform / outboard holder leaving a nasty hole.

Be prepared for the unexpected.
 
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Jun 8, 2004
10,297
-na -NA Anywhere USA
Per Warren Luhrs, Hunter Marine, and Frank Butler, Catalina Yachts, sailboat transoms are designed for a maximum of 10 hp which is standard in the industry.

However, the hunter 27 Edge which was introduced as a power sailor in 2009 could accommodate a 75 ho motor is the last water ballast sailboat offered by Hunter Marine. The transom was in essence redesigned as a power boat transom by their engineers from the engineers on the powerboat side of the Luhrs Corporation. Sadly that boat was introduced 15 years too late as this type of boat was introduced by MacGregor in the early 1990’s with the introduction of the 26
 

JBP-PA

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Apr 29, 2022
474
Jeanneau Tonic 23 Erie, PA
Here is one person's attempt.
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Jan 25, 2007
313
Cal Cal 33-2 cape cod
I'm conflicted about the refit.
1) I like swim platforms, I wish I had one., like the sugar scoops of a few years ago & now many newer designed dual helmed sailboats have them. They make life easy for boarding/dinghy's/swimming. However....
2) The boat wasn't designed to have one. The platform will stick out, isn't integrated like a modern boat where it disappears while sailing. I'm not sure about mounting anything on them. I've read Mary Shelly's book.
3) Good luck. Tough decision. Make sure to post photos if you install one.

*** The first photo shows what looks like a stable platform, next photos are the homemade version from sailing GBU channel...it supports her full weight, not sure how much she weighs,..so I included 2 photos. The last photo is the fully integrated platform on Bene 34.1....hope this helps.
 

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Jan 1, 2006
7,358
Slickcraft 26 Sailfish
I like the sugar scoop pictured above. The girl looks pretty good too! But the connection with a swim platform evades me.
My H356 and my Slickcraft had swim platforms. It was like having a back porch. And made swimming so much easier. I'm not sure I could climb a ladder now. It was also great for drying off without getting the cockpit all wet. And a good place to put implements for cleaning the bottom without having to bother the wife.
 
Jan 19, 2010
12,543
Hobie 16 & Rhodes 22 Skeeter Charleston
...like the sugar scoops ...
Same! I had a walk off transom on my H26 and used it ALL of the time. But buying a new boat and adding a platform are very different activities.

And on that note!... I really like the H29.5's transom with the step/seat/locker on the platform.

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ian260

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Dec 11, 2023
11
Albin 82MS stafford
i appreciate everyone's input. i would love to have a sugar scoop but alas she came without one. So the main reason i wanted a platform similar to my first post is it would be a good place to board (boat is center cockpit with high freeboard), gives me a nice attachment point for my 9hp electric motor (epropulsion), the hollow box at the bottom of the platform is a flotation box which will help offset the weight of the platform and motor slightly (you can also get the platform without this for less weight) and will help lift the stern in a following sea with the extra flotation (although very slightly im sure). I am aware i will need to beef up the transom and the surrounding areas.

As for being able to get the motor out of the water the motor itself has a tilting mechanism that can get it out of the water. Or i can also take it off and place it on a bracket i have up on the railing if i really need it off the platform altogether. It's not to heavy and can quickly be removed and moved.... especially with a platform ;). However, i will probably keep it in the water if i am traveling as the spinning prop will recharge the battery. Im not to worried about the extra drag and reduced speed as im in no rush.
 
Jan 11, 2014
12,174
Sabre 362 113 Fair Haven, NY
i will probably keep it in the water if i am traveling as the spinning prop will recharge the battery. Im not to worried about the extra drag and reduced speed as im in no rush.
Regeneration is the holy grail of electric power for sailboats. So far success has been elusive even for the major players. The only company that has had some modicum of success is Oceanvolt, however those are not outboard engines. Even Oceanvolt systems have limited efficiency, it is not until the boat is sailing at better than 5 knots that any reasonable amount of power can be generated. An outboard won't generate much power at all, certainly not enough to offset the huge loss of sailing efficiency.

I understand the desire to have easier access from the water and from a dinghy. There are simpler and cheaper solutions. Something like this one from Garlick would work along with a standard OB bracket. Much less weight, fewer issues with reinforcing the transom, and no issues with following seas. Take the extra money and invest in more and more efficient solar to recharge the OB.

Also take a look at this video from Sailing Uma. They attended METS, which is a huge industry show and interviewed many electric motor companies.


 

ian260

.
Dec 11, 2023
11
Albin 82MS stafford
Okay last post about this swim platform question. I've found a platform with detachable sides (pictured below). This would negate the following sea argument? Just pop them off when you knows large seas are coming. Still have the added weight though.

I'm just thinking out loud here and definitely appreciate everyone's inputs.

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Mar 26, 2011
3,596
Corsair F-24 MK I Deale, MD
Back to the OP's question.

The problem with mounting an outboard on a swim platform is that moving it aft increases pitching at the prop. The best location, in fact, is about 2/3 of the way aft, in a well. I've had two mutihulls that used that location, and two with the motor closer to the transom. Farther forward is much better in waves and I would NEVER extend the mounting farther aft.

Power boats are different, because when the boat is planing it is pivoting around the transom, not the center of gravity.
 
Jan 11, 2014
12,174
Sabre 362 113 Fair Haven, NY
Okay last post about this swim platform question. I've found a platform with detachable sides (pictured below). This would negate the following sea argument? Just pop them off when you knows large seas are coming. Still have the added weight though.

I'm just thinking out loud here and definitely appreciate everyone's inputs.

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If you want a big swim platform on a boat that wasn't designed for it and a small electric OB to propel it, it is your boat and your money. However, the consensus opinion here, among people that have a lot of experience with boats, including an engineer or two, and some who are well respected in the marine recreation industry, is this is a bad idea.

Have you ever been in the ocean sailing in 3-4 foot seas? Just popping them off will not be an easy task. The wings or you will be in the drink.

The Albin 82MS was designed with a 35 hp Volvo diesel and has a dry weight of about 7.5K lbs. a small electric outboard is not going to move that boat very well, a larger one will add to the weight issue and require a rather large battery bank. Not to mention substantial costs.

If you continue with this plan, I'm afraid another marina will be stuck with another abandoned boat no one wants.
 
Apr 11, 2020
765
MacGregor 26s Scott's Landing, Grapevine TX
Here's my solution for my 26S:

Easily installed and removed in or out of water, inexpensive, and sturdy. In use for 2 years and doing great.
 
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