I would really like to change the hydrostatic transmissions oil on my gt2554 with a horizontal kohler command 23hp engine. It’s been about five years but I’m not willing to pay $90.00 for six individual quart so I’d love it if someone could gove me the correct oil weight or point me in the direction of a cheaper alternative. Thanks ✌🏼.
I understand that pneumatic tests are done at a lower pressure than hydrostatic due to their danger. But for the pressure vessel itself, would it for example have different burst pressures or pressure leak test performance depending on hydrostatic vs pneumatic?
If it matters, I'm specifically interested in COPVs?
Lived in home for 3 years and basement has only had water in it once. From when it down-poured for like a week. Water came up through small cracks in the floor. I angle grounded the cracks and want to know if I should use hydraulic water stop cement or self leveling sealant. Floor was repaired once. Not sure when and how long ago. However, where they repaired the floors. Cracks have reappear from when the concrete further settled/moved or whatever. Looking to repair and finish basement. sealant is flexible but not sure if it will hold when/if water come up through the ground. Can’t find a psi rating. Cement has psi rating but not sure if another crack will appear (along the repaired lines) as floor keeps settling.
I came across those types from a book written around 2010.
It mentioned that these types of CVTs are made, in addition to the belt CVTs.
So I'm considering a build, and looks like the best option will be to use a hydrostatic gearbox.
However, from what I'm seeing online, essentially I need to independently throttle the motor (or figure out a way to have it run with the amount of drive I want to put to each wheel)
That, or be running 100% throttle 100% of the time.
I'm also looking at it thinking I won't have much regen at all, I can't see any possible way to have a hydrostatic setup drive the motor with the output shafts.
The gel layer regulates temperature and fit for the user, but the third ability is the ability to change its density when pressurized. How would the changing of the gel's density affect its impact protection?
As a replacement for regular hydraulics
Constantly cherry picking, flat earthers have tried to use the laws of buoyancy to assert that gravity doesn’t exist, and that it is merely density driving objects towards earth.
This is a gross misunderstanding. Hydrostatics, fluid dynamics also coined by Archimedes, is relevant to geophysics, astrophysics and the understanding of earth’s tectonic plates. More importantly it’s required to understand earths gravitational field.
The Archimedes principle of buoyancy applies to a submerged object, it’s for e being equal to the fluid displaced.
The “fair cup” designed by Pythagoras also helped illustrate hydrostatics and the drag molecules have on one another.
What is hydrostatic pressure though?
“In a fluid at rest, all frictional and inertial stresses vanish and the state of stress of the system is called hydrostatic. When this condition of V = 0 is applied to the Navier–Stokes equations, the gradient of pressure becomes a function of body forces only. For a barotropic fluid in a conservative force field like a gravitational force field, the pressure exerted by a fluid at equilibrium becomes a function of force exerted by gravity.
For water and other liquids, this integral can be simplified significantly for many practical applications, based on the following two assumptions: Since many liquids can be considered incompressible, a reasonable good estimation can be made from assuming a constant density throughout the liquid. (The same assumption cannot be made within a gaseous environment.) Also, since the height h of the fluid column between z and z0 is often reasonably small compared to the radius of the Earth, one can neglect the variation of g.”
Hydrostatic pressure also helps us explain why the atmosphere changes pressure (or density) with height.
Hi Divers:
I have three (2 15l and a 3l pony) Faber BS-5045 Part 1 certified dive tanks I dove with in Europe/UK.
They are now out of hydro.
Does anyone know who could hydro these in the US or Canada?
Thanks!!!
House is on a slab in north TX.
Had my foundation repaired with +7 piers about a month or so ago. They had a plumbing company come out to do the post repair inspections.
Not too sure what these results (https://imgur.com/bH3rdQE) signify, but what would be the next course of action? I have not noticed any issues with water throughout the house yet
Question for fabric/gear nerds: Why do we require such a higher hydrostatic head rating for rain jackets than we do for tents/tarps?
Most UL tents have a HH rating of between 1,200 and 3,000mm. DCF tents get into the 8,000-15,000mm range and this generally doesn't create any issues at all even for all night heavy rainstorms. However, a wind jacket like the Patagonia Houdini random jacketwith 10,000mm of HH is would be considered (probably rightfully so) to be inadequately waterproof for heavy, multi-hour rainstorms and well regarded and reliable rain layers tend to start around 20,000mm.
Why this discrepancy?
Does it have to do with how WPB technology works? (ie it requires a much higher level of waterproofness to avoid "wetting out"?) Is it because jackets take on a much higher level of wear and tear so 3,000mm would be fine to start but since it gets worn down so fast from friction you need to start much higher? Is it because water can pool more since it is not under tension like on a shelter or because it pools in folds?? Does contact with the skin matter here? Is hydrostatic head just a bad measurement to understand this? Are we vastly overestimated/misunderstanding how waterproof our jackets need to be or how that waterproofness work?
I feel like I am really missing something here and I am sure that this has been hashed out in the past but I can't seem to find it anywhere. What's up with this?
Edit: Some people are really caught up on what the HH rating for the Houdini is. It was just a lightweight windjacket that I picked at random as an example (this review lists it at 10k hh: https://lighterpacks.com/2015/05/17/patagonia-alpine-houdini-jacket/#:~:text=Emergency%20rain%20shell%20really%20translates,water%20column%20%E2%80%93%20waterproof%20rating). Any other not-super-waterproof but way higher HH than a tent jacket would have worked. Say the Marmot Precip (advertised at 10,000hh) too. Just ignore the specific example.
Found some older posts, but any local places to have a CO2 tank hydro tested and filled?
I know Kif from Futurama mentions once that his species has a series of liquid-filled bladders instead of bones and he variously demonstrates through the series that he can squish and stretch his body much more that a human can. But surely a hydrostatic skeleton like that would have some kind of upper size limit as the weight of the animal exceeds what the liquid pressure can uphold. And I assume that upper size limit would be less than that of hard bones.
Not even that the liquid itself couldn't hold it, I just figure the liquid-filled bladders would eventually burst from the pressure
