Pic of the Day

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conistoncollie
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Re: Pic of the Day

Post by conistoncollie » Fri Jun 22, 2018 3:42 pm

Do you have to have the air start system (bottles/pipes/hoses/relief valves etc) independently inspected/tested under hydraulic and air pressure, as with steam boilers/pressure vessels. Will it require a valid test certificate and insurance to be operated in a public place?

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Richie
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Re: Pic of the Day

Post by Richie » Fri Jun 22, 2018 5:16 pm

What a very strange question ?
Clarence come out ov zat tank at vonz !

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Renegadenemo
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Re: Pic of the Day

Post by Renegadenemo » Fri Jun 22, 2018 6:11 pm

The bottles have to be tested and they are - they were brand new in 2016, as were all the delivery hoses, fittings, gauges, etc.

The onboard air system I reckon is, and always was, good for no more than three starts. You can't use the last 700psi anyway because it simply will not accelerate the engine to start speeds. The bottles were previously rated to a working pressure of 3200psi with their life limited to 400-odd cycles, but we have no way of knowing how many cycles had been completed by the time we came along. A cycle was deemed to be any event that dropped the bottles below 2000psi from full. So, having carried out all kinds of hot-work on them, we tested to 3200psi and imposed a new WP of 2000psi
Unfortunately this just isn't enough for a clean start with the LP starter. Interestingly, we saw similar gas consumption figures in terms of pressure drop in the storage cylinders to those seen in 66 at Haywards Heath but we were using 100litres of storage and they had 32 - 16 per sphere - so the HP starter seemed notably more gas-efficient. That said, the log from Norris Bro's also shows that they kept stopping to charge the bottles so they weren't going to ever get six starts from them either. They also sailed close to the wind with the JPT and had to shut down on one occasion because the temps went out of limits.
So next we snaffled a HP starter from a museum engine but no way was it going onto the 101 Orph' - the gearbox is totally different on the front of the engine, so instead we set about discovering the difference, which turned out to be a plate ahead of the start turbine with a series of converging nozzles such that compressed air impinges directly onto the turbine blades. It's far less wasteful so with just such a plate made up and tested we saw our gas consumption halved to achieve start speed (1000rpm approx) Now we were getting somewhere but much development work is still needed.
We need more NDT on the bottles and another test as they've been used a bit since. If all is well we may test to a higher pressure and give ourselves a higher WP but only if this is agreed by those who know in the world of pressure vessels and materials. We also need to get some hard data on what the hybrid LP/HP starter is doing with its air to see what we realistically have to do to make the system work. Even if we could safely life it for maybe 30 starts that would see us through a proper proving trial. But for Bute we are simply going to plug in our offboard supply and hit the go-button.
I'm only a plumber from Cannock...

"As to reward, my profession is its own reward;" Sherlock Holmes.

I have wrought my simple plan
If I give one hour of joy
To the boy who’s half a man,
Or the man who’s half a boy.

Sir Arthur Conan Doyle.

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Mike Bull
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Re: Pic of the Day

Post by Mike Bull » Fri Jun 22, 2018 6:46 pm

Renegadenemo wrote:
Fri Jun 22, 2018 6:11 pm
But for Bute we are simply going to plug in our offboard supply and hit the go-button.


...and seeing as Pic of the Day is pretty much accounted for for a while, here's the off-board connection in progress- we're utilising the existing opening in the side of the boat that used to be for the electric start, with a new plate- all totally reversible.


01.jpg
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Renegadenemo
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Re: Pic of the Day

Post by Renegadenemo » Sun Jun 24, 2018 2:21 am

While we're on with the interesting detail parts, the last of the big missing items was finally bottomed today. The canopy...

it's a story of the most amazing help and support from industry far and wide with a step or two still to overcome but today it went onto the boat for a test fit and looked hauntingly like itself.

Canopy.jpg

It still has the masking film on both sides, giving it that dull, pink colouring but once canopy and frame are glued together, annealed and polished it will look stunning.
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I'm only a plumber from Cannock...

"As to reward, my profession is its own reward;" Sherlock Holmes.

I have wrought my simple plan
If I give one hour of joy
To the boy who’s half a man,
Or the man who’s half a boy.

Sir Arthur Conan Doyle.

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mtskull
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Re: Pic of the Day

Post by mtskull » Sun Jun 24, 2018 8:37 am

Renegadenemo wrote:
Sun Jun 24, 2018 2:21 am
.....once canopy and frame are glued together, annealed and polished it will look stunning.
It looks stunning already, Bill.
Did you have a spare canopy made while you were at it?
Obstacles are those frightful things you see when you take your eyes off your goals.

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Mike Bull
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Re: Pic of the Day

Post by Mike Bull » Sun Jun 24, 2018 9:07 am

I'd been impressed - and relieved - by the CAD model being so good, but it was something else again seeing it in place for real, with all it's subtleties absolutely spot on. Massive slap on the back to Bill as well for trimming the thing in - rather him than me!

That's the boat on the new cradle (pics coming from tomorrow), the canopy well in hand, and we even span her over on the starter a few times yesterday on the new off board air supply; not bad for two sessions work!

stukno
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Re: Pic of the Day

Post by stukno » Sun Jun 24, 2018 10:44 am

Hello from a long time watcher of your work.

The restoration of Bluebird is simply amazing, I stand in awe of the achievements that you have made, the originality of the finished product and the Team's ability to motivate others to support the cause. ( with the odd notable exception)

This has been a restoration project without equal and one which deserves national recognition.

We out here wish you every success in the future, its going to be so good to see her back on the water, doing what she does best.


regards

Stu Knowles

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Renegadenemo
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Re: Pic of the Day

Post by Renegadenemo » Sun Jun 24, 2018 11:23 am

Did you have a spare canopy made while you were at it?
There's two parts to the canopy, the actual surface and the frame it sits in. we have a spare surface and that's all trimmed in but we don't have a complete spare frame yet. The frame comprises the rear section that fits into the angle surrounding the headrest, two lower rails that slide in the cockpit rails and the curved section at the front lower edge onto which that little roller fixes. We don't have a spare curved piece, though we do have a chunk of material to make it from. It's doubtful we'll have time to make a second canopy before we go to Scotland but we'll take all the bits so we can cobble one together should the need arise.
I'm only a plumber from Cannock...

"As to reward, my profession is its own reward;" Sherlock Holmes.

I have wrought my simple plan
If I give one hour of joy
To the boy who’s half a man,
Or the man who’s half a boy.

Sir Arthur Conan Doyle.

rich1608
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Re: Pic of the Day

Post by rich1608 » Sun Jun 24, 2018 2:36 pm

My views on the air start. If it were down to me I would either forget about using the onboard system and stick with off-board air permanently as is happening on Bute, or have two new spheres made from scratch. As you said Bill no-one knows how many cycles the originals have been through and no amount of testing, x-rays etc.. can confirm this. I know this breaks the originality rule but these components are safety-critical and for ultimate peace of mind I think it would be best to have new ones made if the onboard system is going to be used. Is this a possibility that has been considered?

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