Recent content by jrmichler

I used SMPlayer (https://www.smplayer.info/) to play this video mostly because it has good single frame capability. Single frame to a frame of interest, then screen grab using ALT-PRTSCN, paste into MS Paint, resize to 800 pixels horizontal, and save as JPEG. Side benefits include ability to...

From a dash cam video taken 3/22/2023. I was dodging a flock of turkeys on the shoulder of the road, and one decided to fly up in front of me. The three photos are three consecutive frames at 30 frames per second. Close, but did not hit. There is an interesting difference between...

It's not clear exactly what you are trying to do, but it sounds like you are simulating a damper, then using the results to derive a damping coefficient. If so, damping coefficients refer to systems where the damping force is a linear function of velocity. Search term damping coefficient leads...

We had a snow storm with strong winds last weekend. The wind lined up perfectly with this cottage to snow in the front door and make a big snowdrift on the road. The plow pile from that snowdrift is right on their driveway. A town plow got stuck near my house. Cell phone camera, slightly...

I once had an original GE data sheet for the Turboencabulator. Sadly, it got lost long ago.

The word tactical has been overused to describe guns, gun accessories, clothing, and clothing accessories. But this, I believe, crosses the line into lame jokes: Plain ordinary Number 2 Phillips screwdriver bits in a hardware store.

No rule of thumb, but here is how I would approach the problem of calculating pressure loss. 1) Thermocouples are normally in a thermowell. That well has a diameter and length. Calculate the Reynolds number from the thermowell diameter and fluid velocity. 2) Find the drag coefficient...

So far, so good. Now I need to see a diagram of the hull with and without your sponsons. Search terms personal watercraft hull design found numerous images. At least one of those should be good enough to show your concept by screenshotting and loading into MS Paint.

Welcome to PF. Your diagrams only show a slotted object sliding over a T-rail. That's not enough for me to help you. Before I can express any opinion on the value of your ideas, I need more information. 1) Are you attaching to an existing bracket? How is that bracket attached? What are the...

High school physics has everything you need except for fluid dynamics. Fluid dynamics is a third year engineering course. Lots of fun reading in between. Which leads to what @Baluncore said. I would have liked to say something similar, but his words are much better than anything I would...

Any valves should be bellows sealed to eliminate leaks past the valve stem. The image below is of a Swagelok bellows sealed flow regulating valve: The above valve is not the right valve for a shutoff application. It is the first diagram that I found in a quick search that clearly shows how...

Google Street View dated August 2023 of that address shows: 106 is the door on the far left. The door in the middle is 102-104. There are several patents assigned to Aerogel Technologies, LLC of Boston, MA. The most recent application was filed in 2023 and published June 2025. Boston is...

Swagelok is a manufacturer of top quality tube fittings. Check them out: https://products.swagelok.com/en/all-products/fittings/tube-fittings-adapters/c/154?clp=true. They have a contact page with a Technical Product Information category.

Welcome to PF. The surface color could be a lead / antimony / tin oxide. Are you sure that the lead is ruined? Did a measurable amount disappear? Molten lead has a vapor pressure, so it evaporates. I searched vapor pressure molten lead, and found this in the Wikipedia article on lead: The...

Not as good as This Street and That Street, but accurate: