aerobiz(at)optusnet.com.a
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 Posted: Sat May 09, 2009 11:38 pm Post subject: AeroElectric-List Digest: 9 Msgs - 05/09/09 |
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Thanks Dave and Kevin, I will try your suggestions first, but if
anyone can advise me on what is required to test the ignition coils it
would also be appreciated,
Martin
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AeroElectric-List Digest Archive
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Total Messages Posted Sat 05/09/09: 9
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Today's Message Index:
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1. 12:41 AM - Re: AeroElectric-List Digest: 15 Msgs - 05/08/09 (Martin & Chris)
2. 05:47 AM - Re: What can GPS and XM antennas see through? (cskelt(at)earthlink.net)
3. 07:06 AM - Re: Re: What can GPS and XM antennas see through? (Steve Thomas)
4. 08:55 AM - Re: Re: AeroElectric-List Digest: 15 Msgs - 05/08/09 (David LLoyd)
5. 12:54 PM - Re: Re: AeroElectric-List Digest: 15 Msgs - 05/08/09 (Cori Hayth)
6. 03:29 PM - Re: Tunnel grounding (woxofswa)
7. 05:51 PM - Re: Ground Power (woxofswa)
8. 06:29 PM - Re: Re: Ground Power (Matt Dralle)
9. 07:18 PM - Re: Re: Ground Power (Richard Dudley)
________________________________ Message 1 _____________________________________
Time: 12:41:52 AM PST US
From: Martin & Chris <aerobiz(at)optusnet.com.au>
Subject: Re: AeroElectric-List Digest: 15 Msgs - 05/08/09
Hi guys,
We are getting an engine miss in a Rotax 912-powered a/c. It is fine
until about 20 minutes into the flight, then you can detect the miss.
Strange given that it has dual ignition,. We tried fiddling with the
carb and leaning the mixture off seemed to solve the problem for a few
hours, but it back worse than ever. The ignition parts are quite
expensive so would like to isolate the problem before replacing
everything.
So what I am looking at is advice on testing the ignition coils. How you
should go about it and what equipment is needed. If they check out,
then the modules will be next, but one thing at a time.
Any advice appreciated.
Martin
>
>
________________________________ Message 2 _____________________________________
Time: 05:47:26 AM PST US
From: "cskelt(at)earthlink.net" <cskelt(at)earthlink.net>
Subject: Re: What can GPS and XM antennas see through?
Folks,
This is to thank all of you who replied to the list and to me personally.
The consensus on the Internet is that GPS signals run around 1.5 GHz and XM Weather
at about 2.3 GHz with corresponding wavelengths of about 20 cm and 13 cm
respectively. This is more than an order of magnitude higher than the frequencies
we use for COM and NAV, and so, all other things being equal, we shouldn't
expect them to penetrate so much of the same solid material -- which was my
original concern, particularly as I have no data on the relative transmissivity
of perspex (that we understand is OK) and fiberglass (that's probably OK, but
I don't know). Even if I can get a good GPS or XM reading while stationary
in the driveway, that doesn't necessarily translate into good navigation at cruise
speed, and that is why positive and negative experiences from a large user
community are worth much more than guidelines from the installation manual.
It seems there are many good functional ways of doing the installation, and some
useful considerations to take into account. Thank
s again.
Regards, Chris.
__________________
cskelt(at)earthlink.net
Chris Skelt
________________________________ Message 3 _____________________________________
Time: 07:06:22 AM PST US
From: Steve Thomas <lists(at)stevet.net>
Subject: Re: Re: What can GPS and XM antennas see through?
Chris,
I am not flying yet, and my experience is anecdotal so take this for
what it's worth. I am building a Glasair Super II RG, all fiberglass
fuselage. The construction is glass over foam sandwich. I have my XM
and GPS antennae on a shelf at the inside-top of the aft fuselage and
the airplane is inside my garage. When I fire up my panel, I can
successfully pick up both the XM and GPS signal. It does take a while
to lock on, and the signal is weak, but it is there. So, both signals
are able to penetrate the garage roof, the ceiling, and the fiberglass
body. Now I suppose I cannot tell how much is coming through the
windows and open garage door, but that is my experience.
Steve
________________________________________________________________________
On May 9, 2009, at 5:44 AM, cskelt(at)earthlink.net wrote:
> Folks,
> This is to thank all of you who replied to the list and to me
> personally.
>
> The consensus on the Internet is that GPS signals run around 1.5 GHz
> and XM Weather at about 2.3 GHz with corresponding wavelengths of
> about 20 cm and 13 cm respectively. This is more than an order of
> magnitude higher than the frequencies we use for COM and NAV, and
> so, all other things being equal, we shouldn't expect them to
> penetrate so much of the same solid material -- which was my
> original concern, particularly as I have no data on the relative
> transmissivity of perspex (that we understand is OK) and fiberglass
> (that's probably OK, but I don't know). Even if I can get a good
> GPS or XM reading while stationary in the driveway, that doesn't
> necessarily translate into good navigation at cruise speed, and that
> is why positive and negative experiences from a large user community
> are worth much more than guidelines from the installation manual.
> It seems there are many good functional ways of doing the
> installation, and some useful considerations to take into account.
> Thanks again.
>
> Regards, Chris.
> __________________
> cskelt(at)earthlink.net
> Chris Skelt
>
________________________________ Message 4 _____________________________________
Time: 08:55:52 AM PST US
From: "David LLoyd" <skywagon(at)charter.net>
Subject: Re: Re: AeroElectric-List Digest: 15 Msgs - 05/08/09
Any chance you have a misplaced gas line that is vapor locking after the
heat gets to it.....!!
After "....20 min's", it is usually a heat related problem.
D
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