Or go the obvious route and get a small low cost EFIS and sell your vacuum instruments to someone with a certified plane, love for round gauges, or fear of new technology.
-------- Original Message -------- Subject: Re: KR> Manifold vacuum From: Gary Hinkle via KRnet <krnet at list.krnet.org> List-Post: krnet@list.krnet.org Date: Mon, January 25, 2016 7:22 pm To: KRnet <krnet at list.krnet.org> Cc: Gary Hinkle <Gary19521 at verizon.net> The theory is good. But it takes too much power to spin a vacuum pump to the rpm required to operate in the proper range. The weight of the electric motor required to produce enough power to spin a pump, and the amps required, is not worth it. There are electric vacuum pumps on the market for certified aircraft. They are used as backup systems to get you on the ground. Heavy, high amps, expensive. The only reliable ways to power instruments is venturi, dry or wet vacuum pump, or electrical instruments. I'm an A&P, ex corporate, cargo, charter pilot. And I do think outside the box most of the time. Have had my KR2 going for 20 years. Sent from my Verizon Wireless 4G LTE smartphone -------- Original message -------- From: Mark Wegmet via KRnet <krnet at list.krnet.org> List-Post: krnet@list.krnet.org Date: 01/25/2016 19:39 (GMT-05:00) To: 'KRnet' <krnet at list.krnet.org> Cc: Mark Wegmet <markwegmet at charter.net> Subject: Re: KR> Manifold vacuum I encountered an interesting 'option' on a car a bought that I had "doubts" about - electric power steering. The pump is driven by an electric motor powered by the electrical system (battery) and has always worked, although the car is relatively new. Why not tie the vacuum pump into the electrical system? You may be able to tie in a low draw motor and rotary pump to drive the vacuum gages/instruments - most that I've seen don't need a lot of vacuum, so why not? -----Original Message----- From: KRnet [mailto:krnet-bounces at list.krnet.org] On Behalf Of Nerobro via KRnet Sent: Monday, January 25, 2016 10:17 AM To: KRnet Cc: Nerobro Subject: Re: KR> Manifold vacuum <--- not a pilot... Yet... Manifold vacuum isn't something I'd depend on. As engine load goes up, manifold vacuum goes down. I'd worry about instruments getting good vacuum on climbout. If the engine cuts out, your manifold vacuum will drop as well (even if the prop windmills). Using exhaust to produce vacuum is interesting too, I bet it would work, but I doubt you'd get good vacuum with the engine windmilling. I suppose i'm making the argument for a vacuum horn, or an engine driven vacuum pump, and am assuming the engine will windmill. On Mon, Jan 25, 2016 at 9:55 AM, Jeff Scott via KRnet ><krnet at list.krnet.org> wrote: > > _______________________________________________ > Search the KRnet Archives at http://tugantek.com/archmailv2-kr/search. > To UNsubscribe from KRnet, send a message to > KRnet-leave at list.krnet.org please see other KRnet info at > http://www.krnet.org/info.html see > http://list.krnet.org/mailman/listinfo/krnet_list.krnet.org to change > options > _______________________________________________ Search the KRnet Archives at http://tugantek.com/archmailv2-kr/search. To UNsubscribe from KRnet, send a message to KRnet-leave at list.krnet.org please see other KRnet info at http://www.krnet.org/info.html see http://list.krnet.org/mailman/listinfo/krnet_list.krnet.org to change options --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus _______________________________________________ Search the KRnet Archives at http://tugantek.com/archmailv2-kr/search. To UNsubscribe from KRnet, send a message to KRnet-leave at list.krnet.org please see other KRnet info at http://www.krnet.org/info.html see http://list.krnet.org/mailman/listinfo/krnet_list.krnet.org to change options _______________________________________________ Search the KRnet Archives at http://tugantek.com/archmailv2-kr/search. To UNsubscribe from KRnet, send a message to KRnet-leave at list.krnet.org please see other KRnet info at http://www.krnet.org/info.html see http://list.krnet.org/mailman/listinfo/krnet_list.krnet.org to change options
