Thane Heins Perepiteia.

[CRANKYpants]

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[CRANKYpants]

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[Yucca]

OK all you math wizards at what rpm does a 40 gram weight, at a radius of 115 mm, weigh 444 KG?

OK, I will answer my own question... Our cut off speed  will be 9000 RPM.

PS: the least all of you can do is to check my math...

Very nice rotor i_ron with incredible results from Thane.

Yes I get 9291RPM using metric numbers.

Note:
Speed of a thrown mag would be approx 400 kph

Equation used:
==================
centrifugal force in Newtons = m*r*w*w 
m = mass in kg.
r = radius in m
w = rotational speed in rad/sec.

Known values:
==================
fmax = 444kg equates to 4354.308N in earth gravity
m = 0.04 kg
r = 0.115 m

Working:
==================

fmax = m*r*w*w

4354.308 = 0.04 * 0.115 * w * w

4354.308 / (w * w) = 0.0046

w * w = 4354.308 / 0.0046 

w = sqrt(946588.696)

w = 972.928 rad/sec

RPM = w / (2*PI) * 60 = 9291 RPM

[i_ron]

TO KEEP THE BOLTS ON WITH ALL THAT TORQUE - I OUGHT TO GET YOUNG OVER HERE ASAP?
RIGHT?

T

Hehehe, just wanted to prove I could bull sh**t with the best of them. Non mechanical people often
make the mistake of over tightening or under tightening their nuts. In this case, if you under tighten
there is not the required clamping friction... and if you over tighten you would stretch the bolt past
its elastic point, Young's Modulus. When you do that when you loosen off the bolt it doesn't collapse
down to its original length. So if when it was running and the bolt loosened just slightly there would
be no clamping pressure left on the cup.

But I see that to over cum your fears of high RPM,  a new design is required where the rotor has a shallow female locating pocket that the male spigot of the cup would fit into. This would make it
pretty well fool proof, which is what I was aiming for.

Oh I see what you were babbling about now with the six spoke rotor. BUT I still don't know if I would
approve of this design. You see the inner row of magnets is going at such a slow velocity that one
throws away any advantage with a small diameter like we are using. It would work quite well at
the diameter of the sundance generator <http://www.befreetech.com/techpage.htm> SCAM SCAM
Not saying yours is a scam, just using the magnet layout as a comparison.

So If you come up with some winning numbers I might think about it more... maybe after the crash...
I will have more time and more need for $$$.

Ron

[i_ron]

Very nice rotor i_ron with incredible results from Thane.

Yes I get 9291RPM using metric numbers.

Thanks Yucca, that makes me feel better. And that is half the breaking force which "should" allow
some error margin, still 7K might be deemed safer.

Incidentally Mr Tee, my cups come in at 40 grams and your present cups are only 30 grams so even
better, speed wise...

Ron