A 12" flat plate and only 4 bolts??
Good luck with getting that to seal at 6 bar....
You really need to think about this better and go buy a proper quick opening enclosure. Or use a flange designed to a flange code like B 16.5
IMHO.
Your problem is essentially that these things are not supposed to be analysed using Ceasar.
Three inch pipe is pretty big for something really designed for one inch tubing.
Is really only the end fittings which are an issue as Ali the others the thermal forces cancel each other out.
The...
The helicopter goes sideways at over 100 knots for reasons they might never work out in less than one second so not a lot of surprise the tail snapped.
If you stick those whirly things up there at least you have some kinetic energy involved. Anything else is so temperature dependant it would work one day and have cold air coming down the vent the next day. IMHO.
CoF will be a lot higher than 0.3. It's. It's basically a set of anchors/line stops 5 feet apart if you follow the recommendations.
How you work out the clamp force though I have no idea.
Going to be difficult to know what happened first, but looking at the tail damage and then at the right hand blade on post 27, that has all the look of a tail strike with the tip of the blade missing compared to the other blad, kind of matching the damage.
Now that might / may not be the root...
As noted by others I think this depends on the location of the fuel tank relative to the engine. Above it and the return line is below the fuel level, then they fit it, below, they probably don't.
I'm not convinced it is as simple as this. As soon as you get any air coming out of the stack it will disrupt the air flow horizontally creating turbulence and changing the pressure. At the sort of velocities you mention up the stack you will also have entry and exit losses which need to be...
The B roll from the NTSB is here https://www.ntsb.gov/investigations/Pages/ERA25MA171.aspx
First bit looks the most interesting but also that the chair of the NTSB is there as well. I'm very impressed with her whenever I hear her speak to the press.
The tail looks like it sheared off a the...
So you mean is there anything which states the maximum differential pressure across a butterfly valve is 3 bar?
This is vendor supplied data.
There is no "standard" I am aware of which states this, nor should there be.
Try another vendor if you want higher than 3 bar.
A couple of things.
Calculations and predictions are not that accurate. Most err on the side of caution so your actual pressure drop from friction could easily be less than predicted. So your margins are very tight.
Any time you fall below atmospheric pressure at any point you are in danger...
I would say its absolutely possible. The question is then how possible?
If you have material which can turn solid then the probability increases.
If you have bird or insect mesh the probability increases.
If you have any sort of pressure valve and not a free vent the probability increases...
Mast bumping is something I had never heard of before, but seems to be when the helicopter goes low G on the top of a climb or sudden dive and its where the rotor blades flex out of plane and "bump" into the mast or the main rotor shaft which then basically breaks off. This doesn't look like...
Where is the 4.5m/sec wind?
If its not blowing into the building and you have no temperature difference, there is no stack effect. Probably only a low noise like blowing across the top of a bottle.
Or at least in this very similar question https://www.eng-tips.com/threads/stack-effect.451536/...
