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jrmichler's latest activity
J
jrmichler
replied to the thread
A
Ramjet effect on drone
.
Yes, this is a well known effect. Search terms p51 mustang radiator thrust will bring up several good hits. The Wikipedia article is a...
Yesterday, 8:27 AM
J
jrmichler
replied to the thread
Random Photos
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When deer see apples overhead, they can stand on their hind legs to get them. That tree had about 90 lbs of apples this year. I...
Monday, 10:14 AM
J
jrmichler
reacted to
fresh_42's post
in the thread
What did you do with your old college textbooks?
with
Like
.
My "like" was for Garfield, of course!
Sunday, 8:06 AM
J
jrmichler
replied to the thread
What did you do with your old college textbooks?
.
Same here, except ME.
Saturday, 5:09 PM
J
jrmichler
replied to the thread
B
Basic thermal energy transfer physics: Insulation value in open airways vs sealed airways
.
Been almost 50 years since I took basic heat transfer in college, so I had to do some homework in order to do heat transfer film...
Saturday, 5:01 PM
J
jrmichler
reacted to
symbolipoint's post
in the thread
States of matter: "viscoelastic fluid", familiar term is "cream"
with
Like
.
Hey, @jrmichler ; I just tried a search in which I asked a question as input field of the search engine (related to "plastic solid")...
Thursday, 8:05 AM
J
jrmichler
replied to the thread
States of matter: "viscoelastic fluid", familiar term is "cream"
.
Here's a couple more terms. Plastic solid is a solid with a yield point. After yielding, it will continue to deform without limit...
Oct 22, 2025
J
jrmichler
replied to the thread
I need a concave mirror with a focal length of 150 feet
.
Much of the hot air does not actually add heat to the surface, but it does give a good upper limit to the amount of heat needed. Using...
Oct 20, 2025
J
jrmichler
reacted to
sophiecentaur's post
in the thread
I need a concave mirror with a focal length of 150 feet
with
Like
.
Many thanks for doing the leg work in this one!! An interesting result I was looking for a practical example of this and I realised...
Oct 20, 2025
J
jrmichler
replied to the thread
I need a concave mirror with a focal length of 150 feet
.
I just finished doing some heat transfer calculation for something else. It's been a long time, so getting back up to speed took time...
Oct 19, 2025
J
jrmichler
replied to the thread
Medical
New Alzheimer's Treatment Clears Plaques From Brains of Mice Within Hours
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I have been collecting articles and papers on lifestyle vs health. Here's some about dementia: Healthy lifestyle reduced risk of...
Oct 18, 2025
J
jrmichler
replied to the thread
A practical way to vaporize fuel for high MPG?
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A rule of thumb is that a typical normally aspirated automobile gas engine burns 0.5 lbs of gasoline per horsepower-hour. Since...
Oct 18, 2025
J
jrmichler
replied to the thread
I need a concave mirror with a focal length of 150 feet
.
I calculated the sun image diameter assuming: Sun 865,000 miles diameter Sun 93,000,000 miles distant Focal length 150 feet Perfect...
Oct 11, 2025
J
jrmichler
replied to the thread
In the early days of electricity, they didn't have wall plugs
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About 1980, my grandmother had her wash machine plugged into one of these adaptors. I asked her if that really worked, and she said...
Oct 11, 2025
J
jrmichler
replied to the thread
HP Required to move a robot 10meters at 1.5m/sec
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You are correct. For moving 4000 lbs, you need some math. Here is how I solve this type of problem. Step 1: Sketch an acceleration -...
Oct 6, 2025
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