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dyfiastro

Obsy design MKII

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Hi everyone

Following a devastating incident a during the last storm a few weeks back I am now investigating and looking at the possibility of building a new upgraded obsy.
The roof and entire front of the obsy got ripped apart, the roof ended up in next doors garden and various equipment including scopes etc.. got damaged and scattered across the garden. 

I am now investigating what options I have to build a mkII version and also reduce the chance of the above from happening again.
This will be a complete new build due to having the pull down the old one for safety reasons.

The original design was a ROR but I am looking at possible designs that will prevent or at least mitigate any possible risk of the roof being ripped off again.
The original was 7x5 but open to options. Budget is going to be a factor due to having to replace equipment etc... but want to do it right.

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Did your damaged obsy have shackles or locking bolts to keep the roof in place?

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13 hours ago, Swoop1 said:

Did your damaged obsy have shackles or locking bolts to keep the roof in place?

Yes the roof was locked down the the main structure using 4 large hinged latch bolts (one on each corner).
The roof was ripped from the latches and they was still in their locked positions so how it happened I still do not understand.

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9 hours ago, dyfiastro said:

Yes the roof was locked down the the main structure using 4 large hinged latch bolts (one on each corner).
The roof was ripped from the latches and they was still in their locked positions so how it happened I still do not understand.

That must have been one hell of a blow going on there!

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Sounds devastating, but one consolation is that if your roof ended up next door, that you don't mention it caused any damage to property or persons, that would have been even worse.

Sharkmelley lost his roof a few years ago, it was a double width observatory, and he had to re-build.  He now uses long straps with ratchet type buckles to anchor the roof down if there is any chance of bad wind.  Not sure of the proper name for them. 

Carole 

 

 

 

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Ratchet Straps, Carole.
The ones used to hold down loads on lorries and trailers etc.

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Thanks everyone.
No other property got damaged so thankful of that, it happened during the night so everyone was in bed.
Living on the west wales coast the obsy has withstood 60+ mph winds with no issue and even a mini tornado. What ever hit did so from a different angle and some serious force, there was lot of properties got damaged that night including an entire balcony being ripped off the side of a house just down the road.

I am in the process of looking locally at options for a shed to convert. 

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On 23/06/2019 at 21:38, laser_jock99 said:

Remember the Bow Street Tornado- just down the road?

Yes indeed, that was the year after we moved to the area.

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That's tragic. Sad when something you have put time and energy into gets trached. Fortunately, as you say, no injuries.

Now that it is 'back to the drawing board' for you, I wonder what you would do differently with the MkII?

Are then any little irritations that you would take the opportunity to fix? Things that with hindsight you would do differently? Or will it just be a straight replacement?

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I don't know if anyone has tried this as a roof securing method-

Install ground anchors such as bolt loops in the floor of the obsy, perhaps even concreted in. Install eye bolts in the roof sructure and then get long ratchet straps between the two to tie the roof down to the ground?

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Hi everyone

Been doing a fair amount of thinking and research and think I have come up with a possible solution.
I have decided to go with a complete roll off structure instead of just a roll off roof.
This I am able to run on a set of rails and the entire structure can be secured and bolted down when not in use.

This is very much a compromise in some ways but does have its benefits being able to image down low etc... due to having no walls in the way and the cost is going to be a lot lower as well.

 

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We initially used this approach but still lost a couple of moveable structures. We now use fixed structures for four of our instruments, the instruments themselves roll out on rails and obviously only get deployed in suitable conditions. This would probably only work well for visual use.   😀

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The [destructive] power of the wind rises as the cube of velocity and is often extremely localized. The danger is when the wind can enter a building and inflate its surfaces to destruction. Suction on corners and flat roof surfaces is often very damaging. A double garage roof, made of hefty, old fashioned, corrugated steel, unpeeled, lifted and flew hundreds of yards over the intervening houses [including ours] and lots of 40' tall trees before landing in a tight roll in the field behind us. It had rolled against the corrugations! Not with them! We only lost a quarter of our roof while the farm behind us was almost ripped to pieces when the wind got inside the giant ports of the attached barns on either side of the house.  Wind speeds were about 35m/s or 70-75mph.

IMO: A ROR ought to be held down with at least four angled turnbuckles into very serious eye-bolts through heavy timbers. The building ought to be bolted down to a heavy slab. Though I used lots of buried, pyramidal, concrete, carport anchors myself. Cladding it in plywood using decent screws all over the framework will provide serious triangulation against building distortion and gaps opening up. Ship-lap and T&G boards with corner braces do NOT provide the same degree of geometric stiffening as sturdy sheet materials. Though they can be easily added on top of the plywood if the appearance of boards appeals.

Fortunately I have access to decoratively grooved 4x8 plywood in 9 & 12mm thickness which I used [in 12mm] throughout my two story building, using hundreds of stainless steel screws into the 2x4 and 2x6 framework. My shed next door using this technique and the same materials has survived unpainted for two decades. Both buildings entirely DIY, working alone. I used fierce, double sided, galvanized, bulldog, truss jointing 'washers' on all the joints of the shed. Screwfix sells them, amongst others. The dome has shown no signs of lifting in any wind so far. It has eight restraints on the base ring to stop it lifting.

The Welsh coast was a ten year battle against the wind while I still lived there. I doubt much has changed.   :huh2:

P1360328 rsz 600 upright bright.JPG

my pics 030 shed rsz 600.jpg

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Thanks everyone

I have now decided on a removable structure. 
A 4x3 shed has been ordered from screwfix and should be here next week.
This will be used as a base for the roll-off shed structure and should be just big enough for my needs.
The shed will be braced and strengthened. I am still in the planning phase of the rail setup but will done in such a way that there will be additional precautions in place to prevent it from lifting.

Room is going to be a premium but considering 90% of my imaging is done remotely from the office I am not too worries as long as everything fits in a custom park position and clears the doors.

overlap_4x3_views_and_sizes.jpg.bfe2c9f9468fd20df6bfd0754ea55d75.jpg

overlap_-_4x3_-_double_doors_-_hd_im.jpg

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