---------------------------------------------------------- Europa-List Digest Archive --- Total Messages Posted Tue 12/19/06: 7 ---------------------------------------------------------- Today's Message Index: ---------------------- 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 _____________________________________ Time: 12:07:14 AM PST US From: "nigel charles" Subject: RE: Europa-List: 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 _____________________________________ Time: 03:06:31 AM PST US From: "William Mills" Subject: Re: Europa-List: William Mills Hi All, Now back on line and thanks to Paddy for the notification. Regards, William ----- Original Message ----- From: "Paddy Clarke" 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 _____________________________________ Time: 04:19:50 AM PST US Subject: Re: Europa-List: Ground Plane From: "Justin Kennedy" 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 _____________________________________ Time: 06:16:02 AM PST US From: "Fergus Kyle" Subject: Europa-List: 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 _____________________________________ Time: 06:26:51 AM PST US From: Graham Singleton Subject: Re: Europa-List: 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 _____________________________________ Time: 10:31:22 AM PST US Subject: Europa-List: Re: Vne Speed From: "h&jeuropa" 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 _____________________________________ Time: 10:32:21 AM PST US Subject: Europa-List: MG Build Manual From: "h&jeuropa" 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 ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message europa-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/Europa-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/europa-list Browse Digests http://www.matronics.com/digest/europa-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.