Transom drawings / thickness / swim platform plates? 1980 53 MY

[Bob Quinn]

Transom drawings / thickness / swim platform plates? 1980 53 MY

Does anyone have drawings or cross sections of the transom thickness plate locations etc.

Trying to figure out if its possible to have a large swim platform that carries a dinghy and/or could withstand the weight of the dinghy and maybe an extra few hundred pounds if people were standing on it at the same time.

Thoughts?

 

[SEVEN]

Bob, do you have a water tank that is built into the transom? If you do it’s going to be very difficult. The bolts have to go through the hull with a back plate to be strong enough to support the larger platform and extra weight. However if the tank is under a bed it can be done. I have the tank in the transom and it was cost prohibitive. We decided to just live with what we have.

 

[Scarlett]

As Rusty said about the water tank, however on my 53 there was extra thickness added to the transom where the swim platform bolts were located. When we added our 4 foot swim platform I through bolted the supports I could see at the ends and lag bolted the rest. So far so good, in fact we have had 4 to 5 people on our platform with no trouble. I have since removed the aft water tank and put in a new one below the berth but decided not to through bolt the other supports.

 

[rsmith]

Just FYI most of the Hatteras transoms are cored. If you have hause pipes through the transom you can see the coring

 

[metama]

Our 77 has an aluminum plate embedded in the transom glass for the swim brackets.

 

[Bob Quinn]

Bob, do you have a water tank that is built into the transom? If you do it’s going to be very difficult. The bolts have to go through the hull with a back plate to be strong enough to support the larger platform and extra weight. However if the tank is under a bed it can be done. I have the tank in the transom and it was cost prohibitive. We decided to just live with what we have.

Hi Rusty, the tank is under the bed, not against the transom.

 

[Bob Quinn]

o.k. reality check. This just seems like it would be ridiculously too big. Yes or no?
Dinghy could probably fit with something in the 5-6 ft range, but you know bigger is better or no?
What is the max size that would still look o.k.?

 

[SEVEN]

Hi Rusty, the tank is under the bed, not against the transom.

Then you can do it. I have twin beds in the master. Ricky and Lucy must have ordered the boat originally.

 

[SEVEN]

o.k. reality check. This just seems like it would be ridiculously too big. Yes or no?
Dinghy could probably fit with something in the 5-6 ft range, but you know bigger is better or no?
What is the max size that would still look o.k.?

View attachment 74857

I’ve always gone by the ( there is nothing that time and money can’t do)

 

[bigbill]

there are aluminum plates molded into the transom from the factory. get a good stud finder with metal stud capabilities and run it across the transom, you will find the plates. drill and tap for what ever size bolts you are going to use. make sure there is nothing on the inside that can get damaged if you drill too deep. on my boat the water tank is 1 inch from the transom so i gad to be very careful no to go too deep

 

[Scarlett]

It’s hard to get a decent angle on the support brackets the wider you make the swim platform. My 4 foot one is about as much as I would want to go and still have a decent angle on the support brackets

 

[metama]

Did you trace blueprints on the 53 in CAD?
If so please share!

If you go big on your swim platform you will have to raise it up as well.
Otherwise it will be dragging in the water.

I have an extension that supports the centerline of a dingy.
I think you will find most hydraulics or dingy based platforms have the edge of the dingy over the edge of the swim platform. That has to be a bunch of weight out on that edge.

I am thinking about re-doing mine with an 18 inch extension.

 

[SKYCHENEY]

The farther back the platform or dinghy lift is, the higher it needs to be to keep it out of the water when you run.

 

[Bob Quinn]

Did you trace blueprints on the 53 in CAD?
If so please share!

If you go big on your swim platform you will have to raise it up as well.
Otherwise it will be dragging in the water.

I have an extension that supports the centerline of a dingy.
I think you will find most hydraulics or dingy based platforms have the edge of the dingy over the edge of the swim platform. That has to be a bunch of weight out on that edge.

I am thinking about re-doing mine with an 18 inch extension.

Well, sort of. I imported pdf "views" I found and scaled to approximate size, so these are only partially accurate. I can share what I have if you like, but I wouldn't trust if for much!
message me your email address if you like and I can send what I have.

I would love to have a real CAD drawing too!
Below is how I did it, for good or bad LOL

 

[Bob Quinn]

It’s hard to get a decent angle on the support brackets the wider you make the swim platform. My 4 foot one is about as much as I would want to go and still have a decent angle on the support brackets

Good point!

 

[Bob Quinn]

The farther back the platform or dinghy lift is, the higher it needs to be to keep it out of the water when you run.

Another good point.

I will have to take a close look next time we are under way to watch the wake pattern.
I'm sure running faster with the bow "trying to come up" probably makes it dip even lower.

But hey my trim tabs don't work so I could just call it a giant trim tab LOL!

 

[metama]

If only we had someone crazy enough to made a digital cad file!!!! I tried to Lidar scan the hull last fall. Guess what doesn't like shinny slight curves.

 

[Bob Quinn]

If only we had someone crazy enough to made a digital cad file!!!! I tried to Lidar scan the hull last fall. Guess what doesn't like shinny slight curves.

Come scan mine, it won't reflect! haha not so funny.

They have a white powder spray for that. I'm guessing you didn't want to trash your hull like that!

Do you have a scanner?

 

[Bob Quinn]

there are aluminum plates molded into the transom from the factory. get a good stud finder with metal stud capabilities and run it across the transom, you will find the plates. drill and tap for what ever size bolts you are going to use. make sure there is nothing on the inside that can get damaged if you drill too deep. on my boat the water tank is 1 inch from the transom so i gad to be very careful no to go too deep

Great tip! thank you