Good solution Ian! regards Rob Rob Thompson 0429 493 828
On Sun, Aug 29, 2021 at 11:38 AM Michael Stockhill <[email protected]> wrote: > Ian, I do like your solution. But I do hope my mechanical tach keeps > chugging. > > I don't know if you have seen it, but a segment of our population seems > to have discovered a permanent solution for stupid in ivermectin, marketed > here as horse paste (with apple flavoring) and Sheep Drench. > > Recent obituary: > > "He died as he lived, free of parasitic worms commonly found in horses." > > On Sat, Aug 28, 2021, 6:15 PM Ian Williams <[email protected]> wrote: > >> If you are wondering why the oil pressure is hard against the stop, I had >> the 2 connections to the oil pressure sender the wrong way round. >> >> >> >> Ian W >> >> >> >> *From:* [email protected] *On Behalf Of *Ian Williams >> *Sent:* Sunday, 29 August 2021 12:16 p.m. >> *To:* [email protected] >> *Subject:* RE: [DOG mailing list] FW: Dimona stuff >> >> >> >> This is not a great picture but does show the taco and hour meters plus >> the real cool fuel computer and CHT >> >> Actually we redesigned the engine baffles and it runs if anything too >> cool. >> >> It is real sad to see what is going on over there. I have been following >> youtube posts by a Dutch woman motorcycling around the world ( Itchyboots) >> Totally fascinating to see how normal people live once all the >> egocentric crap and power and control drama has been scraped off >> >> >> >> *From:* [email protected] *On Behalf Of *Michael Stockhill >> *Sent:* Sunday, 29 August 2021 11:56 a.m. >> *To:* [email protected] >> *Subject:* Re: [DOG mailing list] FW: Dimona stuff >> >> >> >> Nah. You guys think we have slipped over the edge! >> >> >> >> On Sat, Aug 28, 2021, 5:52 PM Ian Williams <[email protected]> wrote: >> >> Thanks Michael. I was thinking that the rest of the world thought we had >> slipped over the edge. I will have another go at sending the picture of >> the hour meters and taco >> >> Sent from my iPhone >> >> >> On 29/08/2021, at 11:48 AM, Michael Stockhill <[email protected]> wrote: >> >> Well that sounds slick, Ian. The tubes delivered your text all the way >> across the pond(s). >> >> >> >> Michael >> >> >> >> On Sat, Aug 28, 2021, 5:42 PM Ian Williams <[email protected]> wrote: >> >> >> >> >> >> *From:* Ian Williams >> *Sent:* Friday, 27 August 2021 4:30 p.m. >> *To:* '[email protected]' <[email protected]> >> *Cc:* '[email protected]' <[email protected]> >> *Subject:* RE: Dimona stuff >> >> >> >> A slight addition …. Of course the other end of the pressure switch is >> connected to ground. >> >> So no hour meters work until you are in the air. When engine is stopped >> in the air, the Airframe one keeps going and the engine hourmeter stops. >> >> >> >> *From:* Ian Williams >> *Sent:* Friday, 27 August 2021 4:25 p.m. >> *To:* '[email protected]' <[email protected]> >> *Cc:* '[email protected]' <[email protected]> >> *Subject:* Dimona stuff >> >> >> >> Hi Kurt and Michael, >> >> I must have bad breath or something because some of my posts to the DOG >> group seem to vanish into free space. However I hope I can help >> >> Because our Dimona was ex Thai, it had a lot of wiring which was not >> needed, so I completely re wired it. Rather than use the original cable >> driven taco, I installed a VDO electric taco Part No 333-953 driven by a >> little Hall effect sensor from Aircraft spruce which screws into the bottom >> vent hole of the Slick magneto. A real plus is being able to calibrate it >> using a 50Hz mains sample … ie 50Hz equals 3000 RPM. >> >> >> >> Refer to the attached picture … the 2 hour meters are also from VDO. >> >> The way I connected them is the common (-VE) of both hour counters >> connected to a small pressure switch (HERGA Manuf part No 6743-0003) .. >> operated by pitot pressure at around 30Kts. The positive end of one switch >> (airframe) connected to the plus bus, the other (engine) connected to the >> relay next to the voltage regulator on the right hand side of the firewall >> looking forward. >> >> If you refer to the wiring diagram on page 25 of the service and >> maintenance manual, notice the oil switch (the oil pressure sender) has 2 >> connections (actually 3 if you consider the earth being the case) It is >> 12 and 17 …. One output drives the VDO oil pressure gauge (15) and the >> other is a switched output driving the relay (9) >> >> That relay when active enables the voltage regulator to work only when >> the engine is running. Presumably a cunning trick to keep the current draw >> as low as possible when the engine is off soaring. >> >> So the plus supply for the engine hourmeter can be taken from the output >> of that relay. >> >> It is a real simple system and has worked faultlessly for 500 plus hours. >> >> >> >> Of interest, I have since replaced the Cyl Hd temp gauge with a MGL 4 cyl >> colour barograph unit >> >> >> >> I would be interested to know if you actually have received this email. >> >> >> >> Best regards >> >> >> >> Ian Williams >> >> ZK-GCB >> >>
