I wondered the same thing so I tried steel and just for fun aluminum.
The steel dropped the input & output around 40 ma's equally, the aluminum did the same only to a greater extent.
I did notice that there was very little change in the rotors rpm.
I haven't tested any further than the ma drop. But it is on my list for further investigation.

Oh..the same results happen when shielding the sides of the coil.

On a side note, I made a small window coil with an led, at 40 mm from the base of the main coil it would light up, but any closer and it would start drawing current from the primary battery.
I think with a bit of tinkering one could recover a good bit of lost energy.

Rod

interesting but i imagine that those metals may not reflect the field they might just absorb it if you got and old hardrives in side them theres a neo magnet encased by two pieces of real magnetic shielding

Okay...you got me to thinking, which is not always a good thing!
I got a couple hard drive mags, pop the neos off and gave it a try. Same thing as the steel.
But this time I left the shielding on for 5 minutes instead of just a couple seconds. The ma's dropped about 40 then started to climb and regained 30 ma, while the rotor increased speed.
Interesting!
So I tried several different materials.
Cast iron 45mm x 25mm.. 40 ma drop, 30ma recovery
Stainless steal exhaust valve (stem removed).. 50 ma drop no recovery.
Steel cover from a floppy drive.. 30 ma drop, 29ma recovery.
A piece of the same cover cut to the size of the coil.... almost 40 ma drop, 30ma recovery.
Steel cover from a CD drive...30 ma drop, 35ma recovery!

In a nut shell...
It seems that shielding the bottom of the coil increases the rotor speed while
reducing the output to the charging battery about 10ma.
Except for the CD drive cover.

Of course this was just a half arsed test. I don't have a scope or a tach, plus the the materials should have all been the same size.

I would love to see the effects on a scope. (hint hint)
Rod

wish i could see it on a scope but one thing you could do is test too see what the spikes going to your output battery are doing one way is to get your energizer set up with the shielding or what ever metal your testing it with and in the line to the batt have a multimeter and a higher voltage capacitor (can find one in a disposable camera) then disconnect the batt so the spikes go to the capacitor and see if the spikes are weaker or what ever there doin

I have completed 3 SSG with only 2 fried transistors :-) anyhow, I am now ready to move on to either add more cores, or goto trifilar wound coils ( maybee both ) What I am looking for is the circuit that will allow me to charge 4 battieries at the same time from one battery.

I have experimented with various cores, and I have found the welding rods worked better than a solid core or iron filings or even and empty core ( which does turn the wheel )

Looking for good working schematics, and WOW you have a wonderful exchange of info here, I have searched all over for the "sharp north" and it is here.

Thanks again

Mart

Hi mart!

been watching your vids on the cores! would you mind posting the results in the ssg thread? Im sure others ill be interested.

Yes, I will post the links to my videos there. I have tested the cores, and after getting alot of feed back will be probably testing again.

Kevin, since I see you are online, can you tell me if you have any results with your superpole setup on SSG you wanted to try?
Thanks,
Jetijs

Hello all,

are there oscilloscope-results of some Bedini motors available?
I don't have such device, but maybe I'll try with the PC / soundcard.

It might be interesting to see the signal with 2- or 4-channel observing:
would like to have a look at the triggering signal related to voltage / current of the main coil or / and to the current, that's flowing to the charging battery.
The behaviour of the switching would be interesting to follow.

Using the PC for scoping I consider a mostly simple way:
a) throttling the input by a potentiometer and b) having a 2 diodes for each channel bridging, thus they will cut the voltage to their treshold (+- 0,7V), protecting the soundcard..

Geron