Seat Extension

[Bigplumbs]

I decided I would make a little removable seat extension for the little rib to make it more comfortable when my wife or someone else comes with me. All the metal is SS and the wood is hardwood. Just need to source some foam, SS staples and upholster it

Dennis

[beerbelly]

id be concerned about the structural strength of the timber legs in a heavy sea they may not be up to it

[Xk59D]

that isn't going to last long and potentially cause a bad injury when it lets go for me.

[Bigplumbs]

Those legs are very strong hardwood and the fixings are bolted through quite think fiberglass. I will however add a triangular brace to make it totally rigid

[Bigplumbs]

I went to put the brace on today and realised that the pics make this little seat look weaker than it is. I still put the brace on each side and it is fit for an elephant to sit on now


Now for the foam and upholstery....... Whewre did I put those stainless steel staples

[willk]

Not meaning to p1ss on your parade either - but to my eye - that seat is not fit for purpose. IMO, the timber size is the least of your problems. Fine on land - just not strong enough at sea...

soz!

[Bigplumbs]

Originally Posted by willk

Not meaning to p1ss on your parade either - but to my eye - that seat is not fit for purpose. IMO, the timber size is the least of your problems. Fine on land - just not strong enough at sea...

soz!

And that is where the pictures don't do the strength justice. I can assure you that it is far stronger than it needs to be. As I said the timber is incredibly strong hardwood and even without the brace I have now added would be way beyond the strength needed.

[Mike B]

I'm not sure anyone is disagreeing that it is strong enough for a person to sit on.

The question is, is it strong enough and fixed securely enough to take the lateral and torsional force, which could be far higher than the weight of a person, put on it from a high G turn, rapid deceleration (wave stuff) or vertical drop (wave slam).

I think the idea is great, but personally I wouldn't risk injury to anyone as don't think it would be long until someone ended up on the floor or worse over the side.

May be, at a real push pottering around a harbour / inland water in flat calm at slow speed.

[sameh]

You can make preliminary test to estimate strength. Apart from that looks nice.

[69cmw]

Best thing you could do with that is use it as firewood .....

[beerbelly]

you could end up being known as splinter plumbs

[Bigplumbs]

Originally Posted by Mike B

I'm not sure anyone is disagreeing that it is strong enough for a person to sit on.

The question is, is it strong enough and fixed securely enough to take the lateral and torsional force, which could be far higher than the weight of a person, put on it from a high G turn, rapid deceleration (wave stuff) or vertical drop (wave slam).

I think the idea is great, but personally I wouldn't risk injury to anyone as don't think it would be long until someone ended up on the floor or worse over the side.


Also I don't know what you think I am going to be doing in a 3.4 m rib with a 15 hp on the back

May be, at a real push pottering around a harbour / inland water in flat calm at slow speed.

Yes it is strong enough and fixed strongly enough to cope with all of the things you mention in fact it is way stronger. It will be fine

[Bigplumbs]

Originally Posted by 69cmw

Best thing you could do with that is use it as firewood .....

If you haven't got anything useful to say then perhaps you should keep quiet.

But to answer your question. If you looked at the pictures and were aware of what it was made out of you would understand that it will actually make very poor firewood. So you were wrong on both counts. Quite an achievement to be wrong twice but only write so few words

[69cmw]

Originally Posted by Bigplumbs

it will actually make very poor firewood

And a seat by the looks of it ....

[Maximus]

Originally Posted by Mike B

I'm not sure anyone is disagreeing that it is strong enough for a person to sit on.

The question is, is it strong enough and fixed securely enough to take the lateral and torsional force, which could be far higher than the weight of a person, put on it from a high G turn, rapid deceleration (wave stuff) or vertical drop (wave slam).

I think the idea is great, but personally I wouldn't risk injury to anyone as don't think it would be long until someone ended up on the floor or worse over the side.

May be, at a real push pottering around a harbour / inland water in flat calm at slow speed.

Spot on
Someone's Back is far too precious to rely on a Heath Robinson contraption like that IMO...it's only got to fail once in the wrong place/time....and you'd never forgive yourself.
.....You did ask.

[beerbelly]

i think folk are only concerned you or a passenger could potentially get hurt sitting on what appears to be a very basic wooden construction. how are the corners of the uprights fastened they appear to have no bracing and they are going to have to take some serious sideways loading in a choppy sea with anything more than a couple of stone to support .unless of course your just deliberately winding us up for your own amusment

[beerbelly]

why not use it as a template and have it made from all stainless tubing fully welded

[Bigplumbs]

Many thanks for all your concerns but it is all complete now braced and incredibly strong, tested and working very well.

I post in many forums and am quite saddened by how unpleasant several people are on this particular forum.

It also amazes me how so many people seem to lack any ability to make something themselves or do their own servicing work but simply like to throw money at a situation in the hope it will be sorted for them.

[Bigplumbs]

Originally Posted by beerbelly

i think folk are only concerned you or a passenger could potentially get hurt sitting on what appears to be a very basic wooden construction. how are the corners of the uprights fastened they appear to have no bracing and they are going to have to take some serious sideways loading in a choppy sea with anything more than a couple of stone to support .unless of course your just deliberately winding us up for your own amusment

In your post above it is the words 'What appears to be' that is your issue. I have told you all several times that the whole structure is incredibly strong, and now braced to make it even stronger. But you all think what you wish and enjoy your boating

[Bigplumbs]

Originally Posted by 69cmw

And a seat by the looks of it ....

Incorrect again but then You will be getting used to that