Body
DougThat foam could be incredibly strong if you give it a fiberglass skin of a light weight cloth or mat and epoxy resin. Do they sell it in sheets?What is the R factor?It will cut very accurately using a hot wire stretched like a coping saw leaving no dust and giving a shiny cut..Good findCheers Warren
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On Tue, 14 Aug 2018 at 4:19 PM, [email protected] [EVGRAY]<[email protected]> wrote:
Hi Mick
The ways I found to maximize what you can get into caps with sinewave peak coil shorting is all this:
1) switching ultra low resistance and if solidstate, then bidirectional mosfet clusters, 4 or 5 in parallel in each cluster. Mosfets should be HV type. Fast diode from source to drain on each cluster allowing hyper AC ringing to flow during closed switch.
Mechanical brush commutator will work fine too.
2) Diodes in FWBR with AC legs across coil being shorted must be HV and very fast type.
3) Collector caps on DC side of FWBR must be HV type and UF value not so heavy that the cap has too much resistance and it blocks the hyper ringing while not so small that you do not catch and hold good amount of joules.
4) Litz wire coils work best because of the HF ringing that happens.
5) Aircores will work fine, if using cores, use HF ferrite type.
6) Too much resistance kills the whole effect, so do not have any sort of resistive load across cap when it fills up.
7) Real power created only upon cap discharge to load.
8) Always have coils disconnected from caps when caps discharge.
9) keep pulse width narrow for when the coil is shorted to prevent reflection...
My mini lab n balcony lab not much have some hand tools and electric drill...but check out video I just put up with the high density Styrofoam this stuff is great to build timing discs, rotor hubs, hall effevt holders, coil mounting blocks etc..cuts and sands beautiful plus super lightweight and cheap. I never have seen this stuff in USA.maybe why Russian missiles and space rockets so superior.
Kone
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