Today's Message Index:
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1. 12:07 AM - Re: Transponder Antenna (nigel charles)
2. 03:06 AM - Re: William Mills (William Mills)
3. 04:19 AM - Re: Ground Plane (Justin Kennedy)
4. 06:16 AM - Transponder antenna (Fergus Kyle)
5. 06:26 AM - Re: Ground Plane (Graham Singleton)
6. 10:31 AM - Re: Vne Speed (h&jeuropa)
7. 10:32 AM - MG Build Manual (h&jeuropa)
Message 1
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| Subject: | Transponder Antenna |
I have an aerial on a homemade groundplane of 'bid' layup/tinfoil
sandwich. It is mounted in the rear fuselage on the fuselage join line.
It works well but sometimes signal is lost when ATC ground station is
straight ahead. I suspect the engine is obstructing the signal. With
that in mind the lower the aerial position the better.
Nigel Charles
Message 2
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| Subject: | Re: William Mills |
Hi All,
Now back on line and thanks to Paddy for the notification.
Regards,
William
----- Original Message -----
From: "Paddy Clarke" <paddyclarke@lineone.net>
Sent: Friday, December 15, 2006 1:18 PM
Subject: Europa-List: William Mills
>
> Hi All,
> If anyone is trying to get in touch with William Mills, his 'phone
> line has been down for best part of a week now - so he has had no
> internet connection. ( Tho' he can be reached on his landline number
> as calls are being diverted ). The earliest he will be back on is
> Monday.
> Cheers, Paddy
>
>
> Paddy Clarke
>
> Europa XS - 404 G-KIMM
>
>
>
>
>
Message 3
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| Subject: | Re: Ground Plane |
I like to think I saved weight in constructing a backplane for my
transponder aerial by using tin foil. I constructed a flat 12" by 14"
backplane using two layers of bid, On a glass surface I put one layer
down and then some drinking straws across for stiffening and then a
second layer. This produced a flat surface which I then covered with
cooking tinfoil. The aerial was mounted in the middle and the whole lot
stuck to the inside wall of the fuselage as far back as was practical.
It needed two legs made from rolled up paper with scraps of bid wound
round them to support it inboard. This has worked well, needs no
maintenance and is not too heavy. I suspect the weight saving is minimal
but the backplane is huge and works well.
Merry Christmas and safe flying to all.
Justin Kennedy
G-ZTED
Message 4
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| Subject: | Transponder antenna |
I agree that the average power is less than one usually experiences from the
ubiquitous cellphone and with the square of the distance is insignificant.
But Nigel is perfectly correct that the engine and one or two brine-bags
may hinder signal strength - was just hoping that the ground antenna was
seldom hiding forward. If this is a problem, just slide the thing sideways a
bit - it can't always be at one o'clock.......
Cheers
Ferg Kyle
Europa A064 914 Classic
Message 5
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| Subject: | Re: Ground Plane |
Justin
only downside is possible corrosion of the connection to the cable
braid. Might be worth finding a silver loaded resin to add long term
reliability
Graham
btw I think your wing roots are the nicest I've seen. I bet the wind
sighs when it flows over them ;-)
Justin Kennedy wrote:
> I like to think I saved weight in constructing a backplane for my
> transponder aerial by using tin foil. I constructed a flat 12 by 14
> backplane using two layers of bid, On a glass surface I put one layer
> down and then some drinking straws across for stiffening and then a
> second layer. This produced a flat surface which I then covered with
> cooking tinfoil. The aerial was mounted in the middle and the whole
> lot stuck to the inside wall of the fuselage as far back as was
> practical. It needed two legs made from rolled up paper with scraps of
> bid wound round them to support it inboard. This has worked well,
> needs no maintenance and is not too heavy. I suspect the weight saving
> is minimal but the backplane is huge and works well.
>
> Merry Christmas and safe flying to all.
>
> Justin Kennedy
>
> G-ZTED
>
Message 6
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Vne
Wow, thanks for all the replies. I've learned a lot from this discussion!! Thats what makes this forum so valuable!! Here is what I have concluded - much of this information is from www.auf.asn.au/groundschool/umodule2.html#flight_envelope
Vne is defined by regulations as the indicated airspeed (IAS) which should never
be intentionally exceeded in a dive or other maneuver in smooth air.
However, unlike the performance airspeeds which are also specified as indicated
airspeeds, Vne is related to those structural characteristics and limitations
associated with bending, twisting and aeroelasticity which affect stability ,
control and structural integrity. Often Vne is related to flutter phenomenon
which tends to be excited by dynamic pressure which increases exponentially with
velocity, but Vne could be associated with other factors; for example bending
of the fuselage.
Indicated airspeed really reflects dynamic pressure rather than airflow velocity
so if the structural limitations which define Vne for an aircraft type are particularly
associated with the distribution of forces associated with velocity
then the specified indicated Vne has to be decreased as altitude is increased
to adjust for the increase in true airspeed with altitude.
The article goes on to state that some aircraft (especially those being operated
at altitudes above 12500 ft) may have a Vne/altitude table which converts Vne
to IAS as a function of density altitude. I imagine that high aspect ratio
wings, like those on gliders, are susceptible to failure that is associated with
velocity and gliders certainly operate at high altitude when possible, hence
the caution in glider training manuals to convert Vne for density altitude.
I'm still curious as to what is Vne for the MG?
Jim Butcher
N241BW
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=82481#82481
Message 7
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I just noticed there is an updated MG Build Manual on the E2004 website. It has
several Issue 3 pages in it.
Jim Butcher
N241BW
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=82482#82482
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