Today's Message Index:
----------------------
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@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
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| 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
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| 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@earthlink.net
Chris Skelt
Message 3
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| Subject: | 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@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@earthlink.net
> Chris Skelt
>
>
Message 4
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| Subject: | 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
----- Original Message -----
From: "Martin & Chris" <aerobiz@optusnet.com.au>
Sent: Saturday, May 09, 2009 12:37 AM
Subject: AeroElectric-List: Re: AeroElectric-List Digest: 15 Msgs - 05/08/09
> <aerobiz@optusnet.com.au>
>
> 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 5
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| Subject: | Re: AeroElectric-List Digest: 15 Msgs - 05/08/09 |
Suspect carburation first, ignition is less likely.
With the engine warmed up try pulling the choke on. This will enrichen
the mixture, so if it runs better the carbs are probably set too lean.
Check the small diameter hoses to both carbs for cracks.
How long has it been since the carbs were serviced, the diaphrams,
o-rings and such replaced?
Kevin
On Fri, May 8, 2009 at 11:37 PM , Martin & Chris wrote:
> <aerobiz@optusnet.com.au>
>
> 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 6
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| Subject: | Re: Tunnel grounding |
Thanks Bob.
I like super clean.
--------
Myron Nelson
Mesa, AZ
Emp completed, legacy build fuse in progress
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=243312#243312
Message 7
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| Subject: | Re: Ground Power |
I am bumping this after a search.
I am in the process of putting together a ground power receptacle for my RV10.
I have ordered a piper receptacle from A. Spruce, and the crowbar and contactor
from BandC.
My primary goals are:
1. To be able to come up to a dead airplane, start it from ground power, and go
fly.
2. To be able to charge a dead or weak battery without having to remove access
panels.
3. to be able to provide power during construction/testing with a cheapo spare
battery. I don't want to buy my ship's battery until the day before my first
start.
I don't necessarily need to be able to switch the ground power on or off. I'm
okay with the act of putting the plug in as switching it on. However, I would
like the circuit to die once I pulled the plug out if that makes sense.
Does the Aero'lectric diagram meet my needs or do I need changes?
Anyone have pictures of an installation, preferably in an RV10?
--------
Myron Nelson
Mesa, AZ
Emp completed, legacy build fuse in progress
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=243327#243327
Message 8
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| Subject: | Re: Ground Power |
At 05:42 PM 5/9/2009 Saturday, you wrote:
>
>I am bumping this after a search.
>
>I am in the process of putting together a ground power receptacle for my RV10.
>
>I have ordered a piper receptacle from A. Spruce, and the crowbar and contactor
from BandC.
>
>My primary goals are:
>
>1. To be able to come up to a dead airplane, start it from ground power, and
go fly.
>
>2. To be able to charge a dead or weak battery without having to remove access
panels.
>
>3. to be able to provide power during construction/testing with a cheapo spare
battery. I don't want to buy my ship's battery until the day before my first
start.
>
>I don't necessarily need to be able to switch the ground power on or off. I'm
okay with the act of putting the plug in as switching it on. However, I would
like the circuit to die once I pulled the plug out if that makes sense.
>
>Does the Aero'lectric diagram meet my needs or do I need changes?
>
>Anyone have pictures of an installation, preferably in an RV10?
>
>--------
>Myron Nelson
>Mesa, AZ
>Emp completed, legacy build fuse in progress
Hi Myron,
Attached are some pictures of my GPU power installation in the RV-8. Works great
and allows me to charge the battery, run the avionics, or start the engine.
I also included the backbone wiring schematic. I'm using the Vertical Power
VP-200 electrical system, but the GPU wiring should be fairly common. The GPU
wiring is shown in the lower right hand side of the diagram. I haven't updated
the diagram yet, but you might need to add a connection between the Sense
input on the GPU plug through a Normally Open push button to the EBus (and through
a small fuse or polyfuse). What I found was that the late-model chargers
won't turn on their output unless they see about 4-5 volts. So, they won't pull
the GPU relay down when you plug the GPU plug in. The button allows you to
pull the relay in and make the charger think there is voltage. The only catch
is that your aircraft battery has to have enough juice to pull the relay down.
Let me know if you've have any questions.
Matt Dralle
RV-8 #82880 N998RV
Laying Carpet Out in CAD...
Message 9
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| Subject: | Re: Ground Power |
Hi Myron,
I installed the ground power circuit per Bob Nucolls including the breaker
switch in my RV-6A. I used it pretty much as you describe except that I
never had occasion to start the engine using ground power. All through the
early testing and any time I wished to run electronics on the ground, I used
a battery charger conneccted to the ground power receptacle. I also did an
endurance test on the battery to determine how long it would maintain
avionics in the event of an alternator loss when the battery was one year
old. Then, I re-charged the battery via the receptacle. It was a great
convenience an did all the things I intended.
Regards,
Richard Dudley
----- Original Message -----
From: "woxofswa" <woxof@aol.com>
Sent: Saturday, May 09, 2009 8:42 PM
Subject: AeroElectric-List: Re: Ground Power
>
> I am bumping this after a search.
>
> I am in the process of putting together a ground power receptacle for my
> RV10.
>
> I have ordered a piper receptacle from A. Spruce, and the crowbar and
> contactor from BandC.
>
> My primary goals are:
>
> 1. To be able to come up to a dead airplane, start it from ground power,
> and go fly.
>
> 2. To be able to charge a dead or weak battery without having to remove
> access panels.
>
> 3. to be able to provide power during construction/testing with a cheapo
> spare battery. I don't want to buy my ship's battery until the day before
> my first start.
>
> I don't necessarily need to be able to switch the ground power on or off.
> I'm okay with the act of putting the plug in as switching it on. However,
> I would like the circuit to die once I pulled the plug out if that makes
> sense.
>
> Does the Aero'lectric diagram meet my needs or do I need changes?
>
> Anyone have pictures of an installation, preferably in an RV10?
>
> --------
> Myron Nelson
> Mesa, AZ
> Emp completed, legacy build fuse in progress
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=243327#243327
>
>
>
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