hoola

the power supply has been fixed for some time and the present setup using transistor drivers instead of the unreliable tubes is better as far as P-P drive to the stack and with no fear of arcing, having only a 2KV max DC potential across any one element. I have occasional readings in the 2-3 milligram range, but nothing remarkable. I will continue to monitor the output daily, and report anything of interest.

today. tests ended with 3 seriesed 500V electrolytics in the +power supply shorting soon after an arc occurred. The most DC across them is 1200V, so I think high stack pulses fed back through the output module, and from there reflected back up the supply lines to damage the power supply. I will install series inductors on both the positive and negative supply leads as a possible preventative of further problems. Before the power supply failed, I had figured out the chattering feedback issue, and corrected an oversight in the bias circuitry, so now all the output transistors have an appropriate temperature.

the negative going pulse inputs drive the positively powered outputs more effectively, and the positives drive the negatives with the same result, not as what i expected

today I got the entire setup powered at 3/4 voltage only, as there is a chattering feedback in the output module (even with no drive going to it) which increases as voltage goes towards full, and 2 of the outputs are not drawing proper current, but the ones that are are at the desired temperature. So, no grave errors were found with shorts and obvious wiring errors. I was curious about if I switched the drives around going into the output module, as one delivers a positive going pulse and the other is it's negative, and i was wondering if the two output stages of the final drive would be better driven by neg sig. input to neg. outputs and positive to positive, or driving with opposite polarities I have two DIN plugs coming from the drive mod, so an easy test by a simple swap. I did hear that there was a difference in apparent drive levels, but haven't followed up on that as of yet. I have not hooked the end piezos back up as signal sources to the scopes, and I will go back to trying load down an end piezo with a resistor to remove energy from that end of the stack, therefor reducing the reflection of the phononic waves, analogous to lowering SWR in a transmitter antenna, perhaps enhancing an energy imbalance within the stack.

the new 4017 and phase inverter boards are installed and working correctly. The power drive module is completed and affixed to the balance arm support structure, but have not powered it up yet, as the arm is still being rebuilt and I don't want to run the module unloaded. Each piezo end will be independently driven and without the common ground, so ten wires per side. I am using the previous arrangement of the two stacks mounted at arm ends, inverted from one another and being run in parallel. The double HV supply is completed and working well.

the dual power supply idea seems more promising as I have been occasionally placing high value resistors across the test stack inputs to gauge the approximate P-P voltage. Up till now a rather weak 1/8" or so of arcing was seen. Upon completing the biasing and drive level adjustments of the phase inverter circuit, running at 125khz, the test resistor exploded, then the remnants burned and smoked. I see this as a positive sign overall, but may be nearing the limits that the particular piezos i have been using can operate at.

while in the process of building the phase inverter module, a new 4017 board is also being built. All signal processing and control of the main 125 khz signal originating from the wavetek generator will be in one chassis, which will feed a second chassis containing the output transistors and related power resistors, itself driven by the dual power supply. The balance arm will be shorter than before, with an overall length of 8" or so as to fit inside a minimum sized vacuum chamber containing the arm only, hooked up by gas tight feed-through capacitors from the driver chassis. If I achieve what appears to be thrust for a second sustained time, the vacuum chamber will be evacuated to falsify or show evidence of any success of the concept.

I have considered that a double power supply of both + and - might prove advantageous. The positive one drives a conventional setup to one side of the stack, with corresponding output transistor from the negative supply driving the other end of the stack. This could deliver a AC signal pulse of an increased voltage as is delivered by the single positive supply only, to it's simple ground reference. Initial tests of the this system seems promising, having used a phase splitter to run a push-pull type drive to the two output transistors. If this system continues to give promise, I will forgo the transformer work for the present and continue to build up the double supply idea. This will require 2 output transistors per channel with an associated phase splitter. The common ground of the stack will have to be eliminated and each piezo will be driven independently by two outputs. This hopefully allow the actual driven signal to each element to meet or exceed 1200v p-p while keeping the individual output transistors below their 800v p-p limitation. Each driving signal is no larger than a single transistor's output, but due to being driven in overall phase additive, by opposing voltage supplies, there should be a significant additive effect. ideally, a PNP complement of the nte 165 might be used, but there seems no high voltage PNP transistors readily available (hence the need for a phase splitter), so I have used a conventional nte165, by putting the negative supply on the emitter, with the collector to ground with the standard size load resistor of 100k, which seems to work fine in today's inital hookup.

Having finished all five transformers, they do stimulate the elements about as well as one would expect, and of inadequate levels. Given their small size they quickly saturate under load, so I have gone back to direct stimulation from the transistors. I will increase the supply voltage to them from the 700v now used in increments to see how much voltage they can safely handle. In the meantime I am researching transformer winding techniques and will acquire ferrite cores and .1mm wire and begin test winds. I will inquire with the seller on the potted tranformers to see if he could request the manufacturer supply the same transformers without completing the final potting step.

i must have hit it way lucky with my first try to wind a new primary, as primary #2 one was rather weak in response test, not responding until driven over 200K. The #1 primary weighs exactly 3milligrams (including bobbin which weighs .367 milligrams) with the scotch tape holding the winding to the core. I swapped the #1 primary onto the core and secondary of the #2 transformer, and the results were still positive, eliminating the core or secondary as a failure point on the #2 primary. The #2 primary weighed 3.21 milligrams, so I trimmed off about 5' of wire and got a reading of just under 3 milligrams without the tape. Amazingly, this slight removal of wire has made the installed #2 primary almost identical to #1 in response in the sweet spot of the 100-200K range.The quick resolve of the problem may have more to do than simple weight (using that as a measure of overall length) such as layering techniques and steadyness of tension, but I appear to have 2 functioning transformers so far.

today I went back to the little transformers and decided to utilize the fact that they are easy to take apart and did so. I removed the primary bobbin and took out the windings, of which there are two in parallel, each only about 3 1/2' long. A second primary winding was of lighter gauge and was used for a feedback line to the spark generator kit the transformer was designed for. I unwrapped a light enamel wire from a small AC motor field coil and wound a single primary of about 40' in length, all I could fit onto the small bobbin and be able to fit it back into the ferrite core. The results are promising, having a good secondary output response throughout the range required and seems to have a good enough input impedance match. I will proceed to re-wind four more of the minis and use them for the next series of tests. The measured DC resistance of the new primary is 3.9 ohms.

today I got in the new 10KV transformers and it began with seeing that they were encased in a hard clear thick epoxy, preventing me from altering them in the manner I had considered. They need a large (.47mfd) capacitor across the primary to get any useful current to transfer through them, indicating a much too low primary winding impedance, but they are an improvement over the previous smaller ones. With the addition of the .47mfd cap, current transfer peaks at 170 KHZ, close to the needed range. I will begin to assemble the new system with those, continue to look online for a more suitable transformer, and will explore the idea of winding my own.

interesting on the narrow angled engine...and the putting antifreeze in the oil seems like an mcast thing to do. I talked to a guy in the 70's who had a vw hippievan and he added an oil cooler aftermarket device that he said helped in summer, though sometime he stuck pot down the oil filler.....

as far as my original concept of laying the engine flat, that could advantage a lower vehicle center of gravity, but it's orientation to vehicle motion is no doubt irrelevant.

yes, once explained properly, things become obvious

it does seem I was incorrect in my assessment of the reciprocal loss, as the pistons slow down at the end of travel, returning the start up energy. The fact that the engine is a closed system was the key....my idea that energy must be used to slow down the mass is from an open system, say a space craft in space needing to exert energy to slow down. Thank you studiot and exchemist.

studiot, you ask where does the energy go when the piston crown stops and then changes direction....it goes into the piston, as drawn from the spinning crankshaft....you have to put energy into a mass to start it moving or to change it's direction of motion. Is this not a simple newtonian rule?

while I can see how placing the engine's piston travel inline with the vehicle motion (almost certainly) does not add any additional velocity to vehicle motion, I am surprised to see the issue of the reciprocation motion of each individual piston as not an inherent loss to a conventional style auto engine.

with each stroke of a piston, the direction of travel changes 180'. The piston stops and has to be re accelerated twice each time the crankshaft completes a single turn. The wankel design is flawed in that the seals are difficult to keep working and the main inefficiencies deal with things other than reciprocation losses, which is complicated by the poor emmisions a wankel inherently has. There are youtube videos that describe the extent of these reciprocation losses should you wish to find a more detailed explanation.

the mass of the piston/rocker arm assembly shuttles back and forth, absorbing energy from the system each time the direction of travel changes that otherwise would be available for rotational kinetic energy for the drive train. This is the main reason the wankel engine or turbines are tried to reduce this loss.

While the efficiency loss due to the reciprocation of the pistons in an typical automobile engine are well known, what if the engine were mounted horizontally, and laid flat with it's pistons arranged to move fore and aft and in alignment to the direction of the vehicle? Would the inertial mass of the pistons/rocker arms moving backwards, and now in alignment with the vehicle motion, cause a slight gain in overall velocity to the vehicle due to simple momentum transfer? While the return piston travel would cancel out any forward velocity gain, would that not essentially remove the reciprocation losses as found in a normally mounted engine, with the piston travels not in alignment with vehicular motion? in this case the engine would have to be an inline, as in a simple in line four cylinder, with no modifications other than the mounting change.

I found a 10KV high frequency transformer online that is three times the size and has 6 separated windings for the secondary that have dividers between them, so that the wire loops up over the dividers, allowing me to cut the line between the two middle secs and rewire for two 5KV secondaries in parallel with the additional current. The nomenclature involved does not identify it well, only listed on ebay as " 10KV transformation ratio 60 high-frequency coil transformer" There is an ID# but a google search showed nothing. They should be in in a week or two. Meanwhile I have built up a test breadboard for getting the impedance match as close as possible with the nte 165 drives. I will use a emitter follower circuit at first as that seems the best transfer using the smaller ones as a guide. The smaller ones are somewhat amusing in that they are literally held together with scotch tape, yet work fairly well, and can develop a considerable arc.

I got the arc transformers in and they are smaller than pictured, being not much larger than your thumb, but do seem useable for the next series of testing. At some point I will build another 4017 driver assy, and an oscillator on two small project boards and dispense with the now year old driver unit which has the original 4017 board and the wavetek 182 oscillator, which are both large and cumbersome, and have all controls, components and power supply on one open breadboard other than the piezo stacks and their support structure.

would a capacitor made of superconducting materials pass a signal with any obvious difference from a normal one? And does the measured inductance of a room temp metal change if it's temp is lowered to superconduction?

I have decided to not test again past the initial negative test as I have no further information as of yet as to the poling polarity used, so as to not potentially damage the new stacks, will wait until the SS driver unit is ready to proceed.