Air Temp Nitinol

[ramset]

yes cost prohibitive in the early days ,perhaps not as much now [I have read 10 fold reduction in costs] ?

This is supposedly an MIT tutorial on the science behind Nitinol

https://www.youtube.com/watch?v=2YVwpBAiA1A

all comments welcomed and appreciated

Chet K

[ramset]

another amazing heat driven engine potential .
[all such gases,fluids or materials need to be considered/evaluated for highest potential in ambient temps ]

go to 4.35 for the "work" says from Zero to 1000 PSI in a few seconds using acetone .

@ will test this claim this week

https://www.youtube.com/watch?v=0Etys8Rt7l8.

[ramset]

Other "SMA Or shape metal alloys

http://web.archive.org/web/20030605085042/http://www.sma-inc.com/SMAPaper.html
link from Ash's old thread here
http://www.energeticforum.com/renewable-energy/10592-rubber-band-motor-nitinol-springs.html

to note: NiTinol has been tested in heat engines for dependability with seeming limitless cycles 81 million in
one example,  which after teardown was found to be stronger and more robust than when first installed.
another curious attribute !

all comments welcomed and appreciated

respectfully
Chet K
PS
Gwandau's wheel which was actually a friend of Gwandau in Sweden as I recall , was said to run [as an oddity no power] ?
would be a very inexpensive test bed for a NiTinol  drive IMHO

[sm0ky2]

http://m.youtube.com/watch?v=N1BoFQp4p9E

[Reiyuki]

The real test for Nitinol would be to graph how much force is exerted from a specific thermal change in a nitinol spring.

Something like:
* Acquire a nitinol spring with a known mass (for example, 10g).
* Attach the spring to a fixed weight and place both in a sealed air-tight container.
* Add a heating element, hair dryer, hot-plate, or other type of heater to the chamber, along with a small fan to recirculate air.
* Graph the change in the mass's height with changes of temperature in the chamber.  That temp gradient is dependent on what variety Nitinol you purchased.

After that is all done, take the mass of the spring and temperature gradients to get joules input to the system. (0.20 cal/g * deg. C for Nitinol)
Graph that against the change in height of the test mass (convert ft-lbs to joules).
The result should look like a 'joules input vs joules output' COP chart spanning a temperature range.

If Nitinol is as magic as it sometimes seems, there should be a small window on that graph where Joules output exceed Joules input.