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Directory:Bedini SG:Replications:PES:Sterling Allan:Data:Exp19 new coil and wheel

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You are here: PES Network > Main Page > There was an error working with the wiki: Code[1] > Directory:Bedini SG:Replications > Directory:Bedini SG:Replications:PES > Directory:Bedini SG:Replications:PES:Sterling Allan > Directory:Bedini SG:Replications:PES:Sterling Allan:Data > Exp. 19: New Wheel and Coil


New Coil and Wheel

'Experiment 19 from Sterling D. Allan's Replication of John Bedini's Directory:Bedini SG'

Summary : Changed wheel from 22" diam 16 magnets to 16.5" diam 24 magnets. Changed coil from ~425 turns to ~1290 turns. New wheel spins faster on old coil, stabilizes more rapidly on new coil. Data compared. At 6-V, with the new wheel on the old coil, the wheel spun faster and drew more current. Not enough data was taken to assess overall efficiency of one compared with the other, but I would guess that the 6-V was performing more efficiently with this set-up. The 12-V, on the other hand, was pulling more current, but rotated slower at the lower resistances, and faster at the higher base resistance.

Exp. 19 Duration : Dec. 24 - 27, 2004



The purpose of this experiment was to introduce one modification at a time to document the effect of each, since I was making two major changes. I first introduced the new wheel, using the old coil. I then introduced the new coil with the new wheel. I would have also tried the new coil with the old wheel, but I had to cannibalize the magnets on the old wheel to construct the new one.


(Reported by Sterling D. Allan, Jan. 5, 2004)

As I've mentioned,

(1) I'm switching out my 22" wheel that had 16 magnets around the edge, and high friction in the bearings, for a 16.5" wheel with 24 magnets around the edge, and a smooth set of bearings.

(2) I'm replacing my 22 awg & 20 awg with ~425 turns coil with a 19 awg bifilar 1290 turn coil on the same size spool, now bulging with wire tightly wrapped.

Instead of introducing both of the changes at once, I wanted to document them one at a time.

So I ran a series of experiments (changing base resistance of the circuit and changing input batteries from 6V to 12V [series] to 18V [series]) with the new wheel, using the old coil. I then replaced the old coil with the new.

Here is what I found when I replaced the wheel but kept the old coil.

I selected a few base resistances (ohms) for which I had input/output current and rpm data from the previous wheel, and then ran the new wheel at that same resistance.

Everything else is the same. Same transistor, same length and gauge of wires connecting the circuit and the batteries. The only differences are the exact voltage of the input/output batteries, and the parameters of the new wheel.

The voltage of the input battery will cause a slight variation in the speed of rotation of the wheel, but it is within about 10-15% for a variation of 1 volt in a 12-V battery. (I am not consulting my notes with exact figures in saying this, but am giving a rough estimate.) For the 6V measurements, the input voltage was nearly identical for both situations: old wheel v new.


At 20 ohms, the new wheel pulled nearly twice as much current to run, increased the speed from just 112.2 to 123.6 (which is almost double the magnets per minute passing the coil), and its input/output ratio was just 8.8% compared to 12% for the previous wheel.

[For those who may be reading this message without a familiarity with the Bedini SG system, a note is in order regarding those low efficiency ratings. Though the output current measures low on a meter, the output battery charges essentially as fast as the input battery discharges.]

At 146 ohms, the new wheel again pulled nearly twice the current, but spun the wheel nearly twice as fast, increasing it from 113.8 to 203.6. And its input/output efficiency was 15.6%, compared to the 17.8% of the old wheel at that setting. The old wheel had two stable rotation speeds at that resistance. The second was 170.4 rpm (nearly half the magnets per minute of the new wheel spinning at 203.6rpm) with an input/output efficiency of 13.6%.

At 606 ohms, the new wheel spun at 259.7rpm, with an input/output current efficiency of 10%, compared to two stable rotation speeds for the old wheel: one at 58.9 rpm at an i/o efficiency of 16.7%, and the other at 65.8 rpm, with an i/o efficiency of 23%. The new wheel pulled nearly four times the current, and produced 6.6 times the magnets per minute passing the coil.

The old wheel began petering out at around 1000 ohms. I did not try this one at a higher resistance, but I would guess that it would go up to 3k ohms, easily. I say this because the old wheel saw its peak rotation speed at around 200 ohms, while the new one peaked closer to 600 ohms.

The old one did not go faster than about 170 rpm at its peak, while the new one is reaching at least 260 rpm in this situation (coil, circuit, magnet spacing, battery size & voltage).

I did not try higher resistances with the 6V to check for possible solid state resonance.

A full-curve profile would be a better, more accurate comparison of capabilities, rather than a resistance for resistance, because the new wheel obviously moves the curve far to the right.

Also, actual charging and load testing would be the best indicator. I did not do any charge rate or load testing for the 6V input.


At 70 ohms, the old wheel pulled 1.01 amps and span at 230.3 rpm. The new wheel pulls 1.315 amps and spins at 201.3 rpm. It's input/output current efficiency is 26.2%, compared to the old wheel which was 18% at that resistance.

At 160 ohms, the new wheel spun 1.54 times faster (2.3 times the mpm) (252.8 rpm v 163.8 rpm), and pulled 1.66 times as much current. Its i/o efficiency was 29.4%, compared to 26.6% of the old wheel.

At 425 ohms, the new wheel spun 1.33 times faster (2.0 times mpm) (222.3rpm v 166.6rpm), and pulled 1.66 times as much current. Its i/o efficiency was 33.3%, compared to 29% of the old wheel.

At 1.29k ohms, the new wheel spins nearly twice as fast as the old did at that resistance, but only draws about 1.5 times as much current. Its i/o efficiency is 25.8% compared to 15.4% of the old at that resistance.

The fastest speed I found was a 733 ohms, which produced a rotation of 364.4 rpm, and pulled 0.376 amps. The fastest I was able to get the old wheel to go was just over 300 rpm.

I did do some charging runs with this 12-V set-up, and saw that its performance was comparable to what I saw previously -- output battery(s) charging at around the same rate as the input battery discharges. The average voltage (input and output) rises, then plateaus, then begins to fall over the course of about 4-8 hours (or more or less). (some runs previously saw increase average voltage runs go for 24 hours or more.


I also tried 18-V input (for the first time on the circuit) putting three 6V's in series.

At 492 ohms, it turned 238.6 rpm pulling 0.745 amps on the input.

As I increased the resistance through the following: 838, 1203, 1258 ohms, the rotation speed very gradually increased, up to 314.9 rpm and the input current decreased to 0.324 amps.

At 1349 ohms base resistance, the wheel began to turn slightly more slowly, down to 311.3

I ran the circuit for two hours with the base resistance at 1260 ohms, and the average 6-V battery voltage (seven involved, three in series on input, and two sets of two in series on output), went from 6.140 to 6.136 volts.

New Coil

The results of adding in the new coil are reported in experiments 20 and 21.

Directory:Bedini SG:Replications:PES:Sterling Allan:Data:Exp21 Load Test Solid State - Solid state charge works better than rotational charge at the same charging current. For the spinning rotor scenario, I implemented most of John Bedini's recent suggestions. Neither test reveals over unity, though the solid state test looked at first like it was going to. 17 pp of data posted. (Dec. 29 - Jan. 3)

Image:DavidAllan balances 1egg a.jpg

Directory:Bedini SG:Replications:PES:Sterling Allan:Data:Exp20.1 Balancing the Egg - reports a phenomenon in which a quasi-steady balance point is attained between solid state resonance and the first rotation speed. At that point, the meter jumps all over the place. (Dec. 29)

Experimental Set-up

Replication particulars

I'm using the Directory:Bedini SG:Schematic and Directory:Bedini SG:Assembly Instructions as defined in this project, and as reported in Directory:Bedini SG:Replications:PES:Sterling Allan:Data.

My new wheel is 16.5" diam and has 24 magnets equally spaced around it.

Image:SDA Bedini SG 16.6-inch 24 magnet.jpg

Close-up of coil, with 1,290 turns of 19 gauge magnet wire..

Image:SDA Bedini SG 16.6-inch 24 magnets coil close-up a.jpg
Materials and Instruments

6V Panasonic-BSG 4.2Ah/20h sealed lead acid batteries part number LC-R064R2P from Data Sheet | photo | catalogue

Multimeter by GB Instruments, GDT-11. Used to measure volts.

Multimeter by UNI-T, Model UT60A, with accuracy of three digits to the right of the decimal point for current readings.

Optical/digital tachometer by (DT2234A)

See also

Directory:Bedini SG:Replications:PES:Sterling Allan:Data

Directory:Bedini SG:Replications:PES:Sterling Allan - Main Index

Directory:Bedini SG:Replications

Directory:Bedini SG:Data

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