twin shafts need to sit on bottom hull modifications

H

hdavetaxi

New Member
Joined
19 Jan 2016
Messages
10
Visit site
Hi All

we have a Todd Tournado 28 ft with twin ht6354 engines
we are planning to put it on a wet mooring as its on shafts
unfortunately this is 4 times as expensive as our local harbour as it goes dry
there is silt but cant garuntee its soft enough for shafts to sink.
my question is
how difficult would it be do add something to the hull to protect the shafts so it could sit on bottom

thanks in advance for any advice

dave
 
Does your proposed mooring dry right out? if so walk out to it take a spade and have a poke around. If the ground is rock free I doubt you would sustain any damage, and overtime she will "clear" a landing spot on her own. Looking at this she may lay over a bit

https://www.google.co.uk/search?q=t...cly&q=todd tornado boat&imgrc=mJX161qPOq8MXM:

So maybe beaching legs would come in handy, thinking about the incoming tide and the wind holding her into it, it's possible that she may ship water before she is fully afloat.
 
Last edited:
Where are you and what else,ie. types of boats moor there. ?
Should give you clue if any other twin screw boats take the ground there.
Hard sand or mud. ?
 
omega2 said:
Does your proposed mooring dry right out? if so walk out to it take a spade and have a poke around. If the ground is rock free I doubt you would sustain any damage, and overtime she will "clear" a landing spot on her own. Looking at this she may lay over a bit

https://www.google.co.uk/search?q=t...cly&q=todd tornado boat&imgrc=mJX161qPOq8MXM:

So maybe beaching legs would come in handy, thinking about the incoming tide and the wind holding her into it, it's possible that she may ship water before she is fully afloat.
Click to expand...

OP states Tod Tornado, this link is for a Tod Tuna.
 
thanks for replies folks

it does dry out almost completely

the ground is usually hard so definitely would not sit on ground there are no other boats with sharfts
so would defo need to add something.
I have heard about mooring legs but would prefer permanent fix really. also the boat weighs around 5 tons

thanks again
Dave
 
The boat that you own I am familiar with.
You would probably be advised to add a centre keel as a way of lifting the sterngear up.
It doesn't need to extend all the way aft, but it would need to pick up the internal stiffening to support the weight.
The addition of removable beaching legs would then complete the job.
The disadvantage of extra drag and fuel consumption, with the added speed implication would be a small factor.
I have seen several boats such as Huntsman and Chris Craft fitted with small steel fabricated extensions to enable them to take the ground with great success.
 
Dill et Bound said:
The boat that you own I am familiar with.
You would probably be advised to add a centre keel as a way of lifting the sterngear up.
It doesn't need to extend all the way aft, but it would need to pick up the internal stiffening to support the weight.
The addition of removable beaching legs would then complete the job.
The disadvantage of extra drag and fuel consumption, with the added speed implication would be a small factor.
I have seen several boats such as Huntsman and Chris Craft fitted with small steel fabricated extensions to enable them to take the ground with great success.
Click to expand...

Wasn't here a thread relatively recently which contained a photo of a similar set up i.e. a fabricated tubular keel? Someone referred to it as a 'Jersey Keel' IIRC.

Might be worth the OP doing a bit of a search
 
DSC_0192.jpgDSC_0194.jpgDSC_0195.jpgDSC_0196.jpg

Hi All

So this is where I'm up to now
the plan is to make a template out of ply and then take that to fabricator to construct in stainless

the idea being that the support will be bolted through the stern instead of the hull
however the weight would still be on the v of the hull. (the shape of the v would be part of the support)
I plan to come past the stern then up towards the dive platform. this is to give plenty of contact for the weld and to allow cross brace.
this support would give around 1 ft of contact with the bed.

this would then be followed by mooring legs
I think this would only come into play occasionally as the bed is usually soft meaning props and support would sink in.

on the rare occasion the ben is hard this should do the job.

my questions are.
what does everybody think?
I'm sure there will be some speed and manouvering issues due to the support being aft of the props and rudders
how bad do you think it will affect this.

thanks in advance for any advice

Dave
 
Last edited:
From your sketches it looks like you're proposing to add a giant rudder that is always set dead ahead. Not sure I'd fancy that, personally. The other obvious question is - what do your insurers have to say about the modification?
 
My Corvette has beaching legs and a keel plate designed for taking the ground in her original berth in Jersey.

This shot shows the stern view whilst dried out - if you zoom in you can see the keel box extends a few inches below the prop sweep ...


The beaching legs mount close to the quarters when the small square plate appears in line with the stern line.

The next shot shows the legs in place as she dried out, She sat heeled to stbd, the port wasn't doing anything ...
 
You must log in or register to reply here.

Share this page

Top