Bouba
Well-known member
Starting first with a cardboard template eventually plywood, until I had the perfect fit
Passerelle
- Thread starter Bouba
- Start date
Bouba
Well-known member
Then I made a drawing and sent it to Jungle Jim
Bouba
Well-known member
Jungle Jim said he needs all the curves to be plotted and suggested making a full-size graph on the floor.
So I made this on the living room floor. It’s a meter square, and it stayed there more than a month! Did I tell you that my wife is really understanding?
So I made this on the living room floor. It’s a meter square, and it stayed there more than a month! Did I tell you that my wife is really understanding?
Bouba
Well-known member
Jungle Jim sent this back to me. I can’t begin to explain how beautiful I think this is...
julians
Well-known member
Looking like a good job, looks like a pain in the backside, but good work on getting it sorted.
Did you do any calculations to work out what sort of forces the varioua bits of metal would need to take, or just decide that x mm thick steel plate would do the job?
Did you do any calculations to work out what sort of forces the varioua bits of metal would need to take, or just decide that x mm thick steel plate would do the job?
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Bouba
Well-known member
This was one eagerly awaited package! And LaserMasters didn’t let me down. Beautifully crafted in 6mm 316 stainless
Greg2
Well-known member
Good write up and looks like a nice job - keep the instalments coming! ?
Bouba
Well-known member
The starboard side was relatively easy to fit but the other one was a long drawn out saga.
To make the T joint I used four half meter long threaded bars
You can see how I’ve left access room for the filter and strainer etc
To make the T joint I used four half meter long threaded bars
You can see how I’ve left access room for the filter and strainer etc
Bouba
Well-known member
Finished?
All I needed was a volunteer to test it
Darn it! Why are dogs so smart?
All I needed was a volunteer to test it
Darn it! Why are dogs so smart?
julians
Well-known member
Are the 'wavy' pieces that join the vertical stiffening plate to the plate that is attached to the stringer in tension or compression?
The right hand (in the photos) wavy piece seems to be fixed to the vertical stiffening plate by those long bits of threaded bar (rather than being bolted directly to the vertical stiffening plate) , do they not allow too much flex? Kind of looks like the right hand wavy piece isn't doing much because of those long bolts?
The right hand (in the photos) wavy piece seems to be fixed to the vertical stiffening plate by those long bits of threaded bar (rather than being bolted directly to the vertical stiffening plate) , do they not allow too much flex? Kind of looks like the right hand wavy piece isn't doing much because of those long bolts?
Bouba
Well-known member
It worked!
But there was a small problem. A slight wobble. Not enough to make it unsafe, just annoying. With me inside the lazaret and the wife bouncing on the tip of the passerelle, I was able to palpate the cause.
The backing plate, despite being 4mm thick and folded on both sides had a slight bowing affect. Like the skin of a drum. It would bow in and out with the movement on the passerelle. Only by a tiny amount but extrapolated over two meters out it became an inch or so.
The cure needed to be done in situ. I could not face taking it apart again. It would psychologically kill me
But there was a small problem. A slight wobble. Not enough to make it unsafe, just annoying. With me inside the lazaret and the wife bouncing on the tip of the passerelle, I was able to palpate the cause.
The backing plate, despite being 4mm thick and folded on both sides had a slight bowing affect. Like the skin of a drum. It would bow in and out with the movement on the passerelle. Only by a tiny amount but extrapolated over two meters out it became an inch or so.
The cure needed to be done in situ. I could not face taking it apart again. It would psychologically kill me
Bouba
Well-known member
Good question. I mulled this many times and couldn’t reach a conclusion. Remember, the passerelle and ram are exerting opposite forces but both are connected to the same plate, which in turn is at the top of the plate that is connected at the bottom to the curvy brackets. It did my head in?
There should be no movement in the stainless steel threaded rods. They flexed a little when tightened but hopefully won’t move again. They are twelve millimeters diameter and there is four of them.
The two curvy brackets are joined to each other in three different places as well as at both ends, they become a girder. So the forces should be shared. But of course the stringer is not in line with the passerelle, it is right on one side.
julians
Well-known member
They look like they would be in compression to me,being located at the bottom of the vertical plate, which will be trying to rotate around a point somewhere between the pasarrelle mounting point and the hydraulic ram mounting point?
I guess it doesn't matter if it has worked.
I guess it doesn't matter if it has worked.
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Bouba
Well-known member
Time to reach out again to Jungle Jim. This is where I started to feel sorry for him, when Jim offered to help he had no idea that I was going to steal a year of his life?
I did some research, and a heavy backing plate might do the trick. Like putting your hand on a drum skin to dampen the vibration. I wanted it to fit over the existing hole pattern of the passerelle and hydraulic ram, but rather than take the nuts off, I decided to make the holes extra big to fit over the nuts and then use oversized washers and bolt it on.
This is what Jim produced for me
I did some research, and a heavy backing plate might do the trick. Like putting your hand on a drum skin to dampen the vibration. I wanted it to fit over the existing hole pattern of the passerelle and hydraulic ram, but rather than take the nuts off, I decided to make the holes extra big to fit over the nuts and then use oversized washers and bolt it on.
This is what Jim produced for me
Bouba
Well-known member
I forgot to mention that I spent hundred on stainless steel fasteners and now I needed a whole lot of extra large and extra thick washers!
LaserMasters very quickly made and posted the new part made of 12mm 316 stainless. It was so heavy that the wife didn’t want me to install it, in case I couldn’t bench press it into place, or it slipped and chopped my head off?
But it went in quite easily (by now, my design ability was improving, and I wished that ease of installation was my first priority all along).
Of course now I was over budget (not a real budget but a man maths in my head budget). The part was an extra £400 as I recall. Again, good value for money from LaserMasters but still not in my original plans.
Time to test. We planned a week’s cruise and would visit lots of ports that were Med style parking. The day we were due to leave was lockdown.
This whole saga has been a tragedy
LaserMasters very quickly made and posted the new part made of 12mm 316 stainless. It was so heavy that the wife didn’t want me to install it, in case I couldn’t bench press it into place, or it slipped and chopped my head off?
But it went in quite easily (by now, my design ability was improving, and I wished that ease of installation was my first priority all along).
Of course now I was over budget (not a real budget but a man maths in my head budget). The part was an extra £400 as I recall. Again, good value for money from LaserMasters but still not in my original plans.
Time to test. We planned a week’s cruise and would visit lots of ports that were Med style parking. The day we were due to leave was lockdown.
This whole saga has been a tragedy
John100156
Well-known member
What an interesting thread, thanks for posting, work looks great...!
Bouba
Well-known member
The passerelle is only part of the story, there are the accessories!
For a start, the passerelle is very high, how do you step up to or down from it? There is no bench seat in the cockpit, it’s free standing furniture.
My plan was to make a folding full length bench seat on the transom. Something to step on and also to sit on. The transom is curved (actually it might be a compound curve) so this was going to be a very difficult build and it occupied a lot of my thinking time.
I ordered some folding brackets from China, but it all got lost in the first lockdown confusion. I tried to claim from the vendor, eBay (or was it Amazon) and PayPal but my claim was rejected.
For a start, the passerelle is very high, how do you step up to or down from it? There is no bench seat in the cockpit, it’s free standing furniture.
My plan was to make a folding full length bench seat on the transom. Something to step on and also to sit on. The transom is curved (actually it might be a compound curve) so this was going to be a very difficult build and it occupied a lot of my thinking time.
I ordered some folding brackets from China, but it all got lost in the first lockdown confusion. I tried to claim from the vendor, eBay (or was it Amazon) and PayPal but my claim was rejected.
Bouba
Well-known member
I decided to go for a step stool instead, this one
Actually, finding one higher enough and made out of stainless was very difficult. Only medical supply companies had them and convincing them to sell you one when you are not a hospital was hard.
Luckily I came across a delightful lady from Inmoclinc a Spanish hospital supplier who helped me. Again not cheap but a quality product.
The step stool actually gives me two options, I can use it in the cockpit or on the swim platform to step onto the passerelle
Actually, finding one higher enough and made out of stainless was very difficult. Only medical supply companies had them and convincing them to sell you one when you are not a hospital was hard.
Luckily I came across a delightful lady from Inmoclinc a Spanish hospital supplier who helped me. Again not cheap but a quality product.
The step stool actually gives me two options, I can use it in the cockpit or on the swim platform to step onto the passerelle
Bouba
Well-known member
Lastly I needed a handhold for safety. I decided to use a flag pole. What’s more I’ve always planned to put a transom mounted flag staff. I found one the perfect length for the job that had a cap on top to make a good handhold. I then firmly fixed it to the transom with through bolts and large washers.
Job done!
Job done!
Bouba
Well-known member
So, lockdown ended. Good weather arrived. Time to go on a short boat ride to a port where I could Med park.
And we did a thorough test. We both stood on the end, I stood on it and went up and down (to mimic lifting a dingy).
I was very satisfied by the results.
Thank you for bearing with me. Have a very Merry Christmas ??????
️
And we did a thorough test. We both stood on the end, I stood on it and went up and down (to mimic lifting a dingy).
I was very satisfied by the results.
Thank you for bearing with me. Have a very Merry Christmas ??????
️