Roarks book of engineering formulas would be a good and challenging stuff You can calculate boiler stress and strain with a little creativity to can examine bolted riveted and welded joints mine has gone missing in my latest move

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- Thread starter Richard Hed
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Roarks book of engineering formulas would be a good and challenging stuff You can calculate boiler stress and strain with a little creativity to can examine bolted riveted and welded joints mine has gone missing in my latest move

I was able to create a sine wave, then couple a second to it until it somewhat matched the test results at a ratio of 2.615:1 The real world wouldn't be perfect and linear, and the test sample is limited, but I found being able to visualize the coupling interesting. This is also done in Blender geometry nodes.

I will eventually have to tie all this into flash steam but haven't gotten there yet.

It finally arrived...and it is glorious. I told my wife, "Honey, look, I can calculate the frustum of a cone!" as she rolls her eyes.Hi Zeb, I appears you are cleverer than I, so don't discount your abilities.

1: On Slide rules: They are simple scales for adding and subtracting logarithms with scales in "real" numbers.

They do not add, subtract regular numbers. Because of that you have to manually write-down what you are doing, and split calculations into their sub-components, then utilise the slide rule to multiply, etc. by adding the logs of those numbers, etc. That keeps the Slide Rulers directly in touch with their calculations in a way that no computer really does. It is a great tool to help you quickly do the calculations, without taking the calculation into a black-box and just giving you an answer.

2: When you understand what you are doing, you then can write it onto and Excel spreadsheet, programable calculator, or whatever and repeat the calculation many times, even using finely changing variables to iterate to an optimum design.

This is where slide rules become obsolete, although a much speedier way of helping you when doing the basic calculations a smallish number of times.

3: Then (the really clever bit!) you can turn the program inside-out to write it so it will iterate to the optimum, so you input the answer, and it tells you the parameters to get there!

I am at the "Stage 2 level" above, but have had "Mathematicians and computer boffins" write software for stage 3, in my various jobs of a few decades ago.

That was what we called Computer Aided Design before PCs were invented... (Apple, Commodore and the rest!). The programme was on a dedicated huge magnetic disc cartridge, and ran on a computer that was like 10 metal wardrobes in a large room. (Like a school classroom). It took 20 minutes to set-up, then we were allowed 3 runs of 15 mins max. (in the middle of the night). to do the calculations. But it cut a 4 year design and development into 2 years, so was easily justified.

Now you could use your "phone" and get an answer in seconds, if you had "the app"! But you need not understand how the answer was produced... Is that progress?

K2

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LOL, show a closer photoIt finally arrived...and it is glorious. I told my wife, "Honey, look, I can calculate the frustum of a cone!" as she rolls her eyes.

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The other side has the base multiplication and division. I'm still a little overjhelmed by the vernierity of it all, as I'm used to counting only 11 lines or 10 spaces....wait..

I can see now how with capable hands a person could calculate and approximate much faster.

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Very nice indeed. Am not sure if I have one with trig funcs.--like that!

The other side has the base multiplication and division. I'm still a little overjhelmed by the vernierity of it all, as I'm used to counting only 11 lines or 10 spaces....wait..

I can see now how with capable hands a person could calculate and approximate much faster.

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Don't be so sure about that, you know there are people who will buy the Brooklyn Bridge and there are alwayws a few who will volunteer for the firing squad.@Richard Hed By request, I have fashioned a traction engine no one will ever want.

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Besides, it has a very nice look. might be a bit tight in a turn, tho'

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Baguio is a beautiful place, or at least it was when I was last there 50 years ago.

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Yes, a beautiful place. Unfortunately, it is a tourist TRAP now. Baguio is a large city with about a mill peeps in the city proper, but counting the peeps out of the city, much larger. Baguio is situated in a hole in the mountains with very steep sides--80-85degs in lots of places. The smog stifles the nose and headache, and the people there are just looking fsor a quick buck. I'll never go there again. And I don't recommend it.Baguio is a beautiful place, or at least it was when I was last there 50 years ago.

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engines are as described below ( from Bonbardier website)

The engines drive six-bladed reversible-pitch composite propellers, type R408, supplied by Dowty. The propeller blades are fitted with an electrical de-icing system.

The total fuel capacity is 6,526l giving a maximum range of 2,519km carrying 74 passengers. The maximum cruise speed is just under 650km/h (403mph).>>

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