Recent content by jrmichler

BTDT, so I'm speaking from experience. You need a sufficient safety factor in the torque calculation. I suggest calculating torque based on 35 mm eccentricity between CG and center of rotation. With a safety factor that large, and your selection of bearings, you can ignore bearing friction...

From my electric bill for December 2025. July was high because of air conditioner and dehumidifier. December and January are high because of furnace blowers. Electric dryer is used year around. Computers are turned off when not in use. All lights are LED. The house was designed to be...

Refrigerator bought new in 2002: 39 Kwh/month. Newer refrigerator bought 2011: 35.8 Kwh/month. Data is from a Kill-A-Watt power monitor. Our total electric power consumption is 250 to 300 Kwh per month.

But such a nozzle can be made by additive manufacturing. Rifle suppressors (AKA silencers) are now made using additive manufacturing.

The Wikipedia article is correct, BUT you need to be very aware of the difference between simplified physics calculations and real world calculations. Simplified physics calculations assume rigid point masses, while the real world has elastic masses with physical size. If you apply a force...

The ratio of fat versus glycogen burning is a function of exercise intensity, duration, aerobic fitness, diet, and other variables. The chemistry is similar for running, walking, swimming, cross country skiing, or other exercise. It's all covered in the book.

I can even drive a crashbox.

Get a copy of Lore of Running 4th Edition, by Tim Noakes, MD. The answer to your question is in there, although you will need to spend some time digging. If not in the text, the list of references runs about 100 pages. Sample from page 107 (MUCH more in the text):

In order to heat the aluminum strips to 750 deg F, the heater will need to be at a higher temperature. How much higher depends on design details, but I suggest using a design temperature at the heater of at least 900 deg F. I do not advise steel HVAC duct. That material is zinc plated...

After I had cataract surgery, I experimented with reader glasses from the rack at the pharmacy. The +2.5 worked for normal reading, and +1.5 worked for my computer monitor. The +1.5 glasses did not work for reading. Then I got an eye exam with a prescription for bifocals. The distance...

You have a hydraulic circuit with a flow resistance in one direction, and a different flow resistance in the other direction. Try search terms valve Cv or flow coefficient to learn how these flows are handled in the real world. The Cv is found experimentally, although you are free to try to...

Sure. But first, you need to show us exactly what you are trying to do. This requires a sketch. The sketch does not need to be a detailed engineering drawing. A simple pencil sketch that shows your concept is normally enough. Designs that look similar can have either laminar or turbulent...

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...