Interestingly the EIS from Grand Rapids logs hours when rpm is registered.
The elba fuel computer logs hours when there is fuel flow. So both units
give effective engine hour monitors. The pressure switch on the ASI is an
elegant trick which must give quite a good record of flight time and
therefor engine at high power time.
Jerry
lts@avnet.co.uk
http://www.avnet.co.uk/touchdown
----- Original Message -----
From: Nigel Charles <72016.3721@compuserve.com>
Subject: Re: Prague trip
> Message text written by INTERNET:Grahamclk@aol.com
> >
> In a message dated 08/06/00 18:35:43 GMT Daylight Time,
> mike.cater@talk21.com
> writes:
> << The flying time we record is from our Hobbs meter which cuts in when
the
>
> pitot pressure is that of 35kts. >>
>
> Interesting -presumably an add-on ?- my meter total is wildly over the top
> as
> it runs all the time the master switch is on, and is swamped by
> electronics
> test time. Had thought of latching it from rpm input to get engine time,
> but
> have never got around to it.
> I get accurate flight times, speeds and distances by post-scanning the gps
> track points for the time (coincidentally the same as you) between 35kts,
> though it could be anything nearby as the sample interval is normally set
> to
> 30 sec. Mustn't stall in flight though (:-))
> <
>
> I have included 2 LCD hourmeters
>
> 1. Flight time hourmeter using a pressure switch like Mike's (available
> from RDS)
> 2. Engine time hourmeter using a combination of the master switch and
> alternator output to sense when the engine is running (I assume that I am
> not going to run the engine for significant amounts of time without the
> alternator). This saves another wire through the firewall and arranging an
> oil pressure switch.
>
>
> Nigel Charles
>
>
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