Recent content by zul8tr

Some Q's and suggestions: 1) what treatment type is on the label? I assume your 6x6 are at least ground contact general purpose unless you were able to get the next more severe treatment level up or have access to contractor treatment CCA high level dose the best. This CCA was banned by EPA...

Great example of a Morning Glory spillway, designed several. Very interesting hydraulics not so much at the circular weir but once you get down into the receiving pipe and the down stream conditions. Also called a Glory Hole and Bell Mouth spillway Wouldn't want to get stuck in one, not...

From original post: "Where it becomes abstract for me is following a section of this fluid as it travel along the pipe and what happens to it (A) I think it experiences a net force of 0 at all points because it is not accelerating. I am assuming the opposing force due to friction is keeping the...

From my 2 cycle outboard race days reeds were carefully monitored and played with type, thickness, reed stop length and reed max opening as well as reed cage landing surface texture for holding oil for a reed landing cushion. Stock engines were required to use SS modified engines used fibre...

Actually the area used in the generic lift, drag relation of 1/2 x density x C x A x V^^2 is arbitrary since the coefficients of lift and drag are by experiment are referenced to the area dimensions selected. A classic text by Prandtl & Tiegens on Applied Hydro & Aerodynamics selected the...

Even with the Bernoulli no friction etc.equation there can be a pressure drop over distance, depends on the geometry . With Bernoulli the total energy over distance is constant and made up of: elevation + pressure head (p/unit wgt) + velocity head (V^2/2g). Ex: If the pipe diameter changes over...

Thank you for that document reference from the Skunk Works leader Kelly Johnson

Seems reasonable still would like to see a M3.2 flyby at 70kft viewed from another SR71 at the same speed, not likely .

Bernoulli is only an energy conversion equation, need the Energy equation with friction and other irreversible processes. The transition for flow leaving the smaller pipe suddenly at its end in the larger pipe is gradual over a distance from the small pipe end and it depends on diameters, flows...

Thanks, reasonable responses on the orientation of the spikes. I would like to review the wind tunnel data and see some Schlieren photos for different Mach #'s and spike in out position and testing of spike orientation down and in, no doubt still TS. At least in the video the spike is pointing...

When I inspected the SR71 at the Dallas Air and Space Museum I noticed that the intake spikes pointed down and inboard toward the fuselage centerline. I am aware that they are adjustable related to Mach speed (out for low Mach in for high Mach at first thought contrare but the pilot explained)...

Prop force vector (3D) is but one total force there are: hull water drag, hydrodynamic lift on planing surface, air drag and lift topside and below, gravity vector. All can be in or out of balance at steady top speed and while accelerating. In the outboard hydros I run there is a sensitive...

That depends on the area of Civil you will practice in and there are many. If you get into analysis, design, plans and specs yes to knowing how to sketch well. There are some 20 and 21st century areas of Civil that to sketch is generally not needed but not the case for traditional Civil...

My assumptions state the orifice area Ao is << piston area Ap and the container uses a incompressible liquid. You never mentioned a gas in your problem statement ? If a gas is in the cylinder that is a different problem. Please state more specifically the problem when posting.

If I was still doing consulting engineering I would look for a rather simple practical approach that represents a good proxy for the behavior of the proposed system to achieve reasonable practical relative results within the client’s budget. Assumptions and approximations (see attached sketch...