How To Bring The PWC Along

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We do both.
I have a wave runner and a 14ft Seadoo jet boat.
When we take the little boat and the wave runner we put the wave runner on the swim deck. When we dont have the little boat we tow it.

If towing it you need to add a shut off valve to the intake water supply or you will hydrolock the engine. It is easy to install and you can buy the valve from any hardware store.

We are on a lake so conditions for towing are good I could see using something like you showed if in the ocean as the water isn't as flat as a lake.
If you do tow it make a bridal that connects to each cleat and have it long enough to clear the swim deck. Then off the bridal connect a 75ft" or more" long line to the PWC. I like to tow mine about Twenty five feet back from where the prop wash breaks.
Make sure to use floating line for both.

The rope I use is the same that you use on jeep and rock crawler winches. It is expensive but very strong.
It is called dyneema
https://www.knotandrope.com/collections/sailing-boating-rope/products/amsteel-blue-dyneema

I like the system that you showed however I like a clean swim deck so dont think I would like the hardware on it.
 
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I looked at that, pricey considering the hardware. Ended up buying a Towdster $750. Works like a charm. We tow on the Ohio River so conditions are not bad.
The towdster we use for the seadoo, I had topknott make a custom harness for towing our walkerbay venture 14' with a 60hp honda.
 
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You must have to winch that up?
"Another special feature of the H3O davit is the adjustable and removable winching system. The stainless steel retrieval arm is adjustable from 3′ to 6′, depending upon the length of your tender, and is easily removed for storage while underway."
I'd love to be able to have something like this for my Seadoo on my 290, but I just have the factory swim platform and I'd also have to wonder about the weight being an issue on a "smaller" boat like mine.
The price on a couple of these are just ridiculous for what they are. I'm not talking about the aluminum ones that actually have a little bit of engineering involved.
The ones that are towing 100' behind the boat I think are just insane. You can barely see the rope in the pic nevermind if you're a kid on a ski jumping wakes. Should they be? Maybe, maybe not, but they're kids...
 
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"Another special feature of the H3O davit is the adjustable and removable winching system. The stainless steel retrieval arm is adjustable from 3′ to 6′, depending upon the length of your tender, and is easily removed for storage while underway."
I'd love to be able to have something like this for my Seadoo on my 290, but I just have the factory swim platform and I'd also have to wonder about the weight being an issue on a "smaller" boat like mine.
The price on a couple of these are just ridiculous for what they are. I'm not talking about the aluminum ones that actually have a little bit of engineering involved.
The ones that are towing 100' behind the boat I think are just insane. You can barely see the rope in the pic nevermind if you're a kid on a ski jumping wakes. Should they be? Maybe, maybe not, but they're kids...

Hurley sells an extension for the H30 as well. Quite spendy...you could buy a spare SeaDoo spark for what they get for the davit and the extension :)

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You must have to winch that up?
Yes, I have the electric winch package and it takes me 3 minutes total to get it in the cradel with little effort. The whole assembly pops off th swim step and stores away when i don't want it on.
 
I have seen Seadoos mounted on swim platforms of older boats and wonder if the boat designers ever anticipated to have 900 lbs (throw in a +400 human lbs) hanging off the back of the platforms?? It must put tremendous pressure on the attach bolts for the platform.
 
I've been dealing with this same problem for about a year now! Sea Ray says the platform on our 410 is only rated for 500#'s which is at the centerline of the platform. The davits that hold the weight aft of the platform multiply that weight significantly and I was advised against using them for our dinghy which is about 450 lbs fully loaded. There is also the challenge of how do you get all that weight up on the platform? Our platform sits about 15" above the waterline. Definitely check with Sea Ray regarding platform capacity prior to getting too deep into this.

I'm curious about the Magic Marine Tow also. I like that it keeps the weight off the platform but my concern is that it is going to hold the Dinghy right in the trough behind the boat. Would it fill with water back there and swamp? I also don't want a bunch of hardware left on the platform when I'm not using it.

I read where someone had pulled the bow of their dinghy/pwc right up on the platform and secured it there but I never found much information on it. I don't know if they built a cradle for it to sit on or how they protected the platform. I think the guys that tried that are on this forum but not sure. I always thought that this was an interesting idea.
 
Was this for the old boat? Thought you were leaning towards a retractable type for the 37, what changed your mind?
Two different use cases. I had the undermount arm style for the 3, and I'll be adding that to the 37 too.

The hydraulic item is the new Sea Step from Sealift, which I am planning to add. That's a hydraulically-deployed set of under-platform steps to ease getting back on the boat from the water.
 
I've been dealing with this same problem for about a year now! Sea Ray says the platform on our 410 is only rated for 500#'s which is at the centerline of the platform. The davits that hold the weight aft of the platform multiply that weight significantly and I was advised against using them for our dinghy which is about 450 lbs fully loaded. There is also the challenge of how do you get all that weight up on the platform? Our platform sits about 15" above the waterline. Definitely check with Sea Ray regarding platform capacity prior to getting too deep into this.

I'm curious about the Magic Marine Tow also. I like that it keeps the weight off the platform but my concern is that it is going to hold the Dinghy right in the trough behind the boat. Would it fill with water back there and swamp? I also don't want a bunch of hardware left on the platform when I'm not using it.

I read where someone had pulled the bow of their dinghy/pwc right up on the platform and secured it there but I never found much information on it. I don't know if they built a cradle for it to sit on or how they protected the platform. I think the guys that tried that are on this forum but not sure. I always thought that this was an interesting idea.

I did some back of the napkin math before moving forward with my platform/dinghy. If you do nothing, use the existing mounting strategy, going from the OEM platform to a 44" aftermarket platform while also planning for a 500lbs dinghy the worst case load on the backing plates goes from round about 30psi up to 70psi. A big increase. But that also assumes the dinghy is 100% loaded at the aft edge of the platform which is not entirely realistic.

Judicious use of larger backing plates can improve the situation. So too can the use of more, better located bolts. But at the end of the the day the Sea Ray spec says the back of that boat can support roughly 625lbs stock (ignoring torque) using 12 thru-bolts and maybe 4-8 square inch backing plates. The move to 750+/- lbs isn't "dramatic" if smart about attachment strategy.
 
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