Return-Path: Received: from sccrmhc11.comcast.net ([204.127.202.55] verified) by logan.com (CommuniGate Pro SMTP 4.2b7) with ESMTP id 310901 for flyrotary@lancaironline.net; Sat, 10 Jul 2004 22:12:54 -0400 Received: from 204.127.205.147 ([204.127.205.147]) by comcast.net (sccrmhc11) with SMTP id <20040711021215011009m41le>; Sun, 11 Jul 2004 02:12:25 +0000 Received: from [68.51.44.162] by 204.127.205.147; Sun, 11 Jul 2004 02:12:14 +0000 From: kenpowell@comcast.net To: "Rotary motors in aircraft" Subject: Power requirement Date: Sun, 11 Jul 2004 02:12:14 +0000 Message-Id: <071120040212.2560.40F0A1FE0009828900000A00220076219404040A99019F020A05@comcast.net> X-Mailer: AT&T Message Center Version 1 (Jun 24 2004) X-Authenticated-Sender: a2VucG93ZWxsQGNvbWNhc3QubmV0 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="NextPart_Webmail_9m3u9jl4l_2560_1089511934_0" --NextPart_Webmail_9m3u9jl4l_2560_1089511934_0 Content-Type: text/plain Content-Transfer-Encoding: 8bit Al, old notes follow; you probably have this but it may help the new guys: Tracy Crook wrote: > > The EC2 itself only uses about .15A. The pumps I have are rated as 8 A. Max > but the measured typical load during cruise conditions is only around 4A. > Total system load in emergengy mode (all non essential stuff off) is about > 13 Amps. I have just over an hour to find a place to land if the alternator > quits. BTW, it is nuts to fly one of these "electric airplanes" without an > alarm to warn of alternator failure. > > Tracy Crook -------------------------------------------------------------------------- I calculated that at 6000 rpm that the current draw as below: Injectors (Peak and Hold type) 3.3 amps (calculated) EFI Pump (one running) 5.6 amps (according to specs) Ignition Coils (lead only) 7 amps (estimate - could be on high side) Additional - CPUs etc 1amps (estimate) Total - 16.9 amps Ed Anderson -------------- Original message -------------- There have been various numbers bandied about on the current requirements to run the engine, but I go back through my notes and find I don’t have any firm idea. Too much inconsistency. It would be nice to know for each item – injectors, coils, pump, etc.; but I’d be happy to have a measured total current draw to run the engine: 1 of Tracy’s fuel pumps, all the injectors, all the LS1 coils, and the EC-2. Anybody operational with an ammeter that could turn everything else off, battery charged, run at high rpm – like 5000-6000, and measure the current? Nothing in Tracy’s write-up on the EC-2 except that he uses a 50A breaker on the engine critical bus. I would hope the steady value is about a third of that; or less. Al --NextPart_Webmail_9m3u9jl4l_2560_1089511934_0 Content-Type: text/html Content-Transfer-Encoding: 8bit

Al, old notes follow; you probably have this but it may help the new guys:

Tracy Crook wrote:
>
> The EC2 itself only uses about .15A. The pumps I have are rated as 8 A. Max
> but the measured typical load during cruise conditions is only around 4A.
> Total system load in emergengy mode (all non essential stuff off) is about
> 13 Amps. I have just over an hour to find a place to land if the alternator
> quits. BTW, it is nuts to fly one of these "electric airplanes" without an
> alarm to warn of alternator failure.
>
> Tracy Crook

--------------------------------------------------------------------------

I calculated that at 6000 rpm that the current draw as below:

    Injectors (Peak and Hold type) 3.3 amps (calculated)
    EFI Pump (one running)   5.6 amps (according to specs)
   Ignition Coils (lead only)     7 amps (estimate - could be on high side)
Additional - CPUs etc           1amps (estimate)

      Total - 16.9 amps

Ed Anderson

-------------- Original message --------------

There have been various numbers bandied about on the current requirements to run the engine, but I go back through my notes and find I don’t have any firm idea. Too much inconsistency. It would be nice to know for each item – injectors, coils, pump, etc.; but I’d be happy to have a measured total current draw to run the engine: 1 of Tracy’s fuel pumps, all the injectors, all the LS1 coils, and the EC-2.

Anybody operational with an ammeter that could turn everything else off, battery charged, run at high rpm – like 5000-6000, and measure the current?

Nothing in Tracy’s write-up on the EC-2 except that he uses a 50A breaker on the engine critical bus. I would hope the steady value is about a third of that; or less.

Al

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