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On Tue, Jun 10, 2014 at 9:01 PM, Peter Champness <[email protected]> wrote: > Thanks Gary, > > For some reason the images were not easy to down load. > > Image 1. I take they are scub(bers). > > Image 2. Wright flyer at the Rheims event 1909? > > > On Mon, Jun 9, 2014 at 11:33 PM, Gary Stevenson <[email protected]> > wrote: > >> Hi All, >> >> Further to my earlier email, here are two images for your consideration. >> The first might inspire you to have a look at higher definition images of >> T-L ‘s work. >> >> Re the second image – a painting by Rousseau who was a contemporary of >> T-L – what is that strange contraption that is shown in the sky? >> >> >> >> Gary >> >> >> >> *From:* [email protected] [mailto: >> [email protected]] *On Behalf Of *Gary Stevenson >> *Sent:* Monday, 9 June 2014 10:32 PM >> *To:* 'Discussion of issues relating to Soaring in Australia.' >> *Subject:* Re: [Aus-soaring] Cloud proof fence >> >> >> >> Hi Mike, >> >> Awesome. Very nicely brought together. >> >> ************************************************************************** >> >> Loved the bit about the “stunted poor excuses for trees” I immediately >> flashed on Henri de Toulouse- Lautrec, one of the masters of the French >> Post- Impressionist school of painting who was also a bit that way >> (although not a tree). >> >> ************************************************************************* >> >> Waffling on, you are no doubt familiar with the “Mallee Scrub” . Unknown >> to most of the world, Mallee roots are the finest/ best heat output, wood >> fuel known to man. However I can assure you that they are “a bit” gnarly, >> and do not split like plantation grown pine. >> >> >> >> Gary >> >> >> >> *From:* [email protected] [mailto: >> [email protected]] *On Behalf Of *Mike Borgelt >> *Sent:* Monday, 9 June 2014 7:29 PM >> *To:* Discussion of issues relating to Soaring in Australia. >> *Subject:* Re: [Aus-soaring] Cloud proof fence >> >> >> >> You need to understand the geography and climate of SW W.A. >> >> The wheatbelt is the area in the SW where the rainfall is high enough to >> grow wheat. Check out any satellite photos of the area. The rabbit proof >> fence is the limit of that area pretty much. I had a pal in physics at UWA >> in the late 1960s who came from a farm just west of the fence. If they were >> lucky they got a crop 2 out of 5 years and then the bastard emus would be >> looking hungrily at it from the other side of the fence. >> >> So the fence location isn't exactly independent of the surface >> vegetation/rainfall characteristics. >> >> The rain is mostly in winter apart from the odd summer thunderstorm and >> comes from the showers following passage of cold fronts. Much of the rain >> falls on the coastal plain and Darling range (what there is of it - Perth >> is built on a coastal desert) and what is left goes to the wheatbelt. >> >> After the harvest in December the wheatbelt is nearly bone dry. Great >> outlanding country - tell me about it. Your biggest problem, if you didn't >> figure out where the fences/roads/houses were while still airborne is >> figuring out where to walk to after landing. If you fly there in summer >> you'll get good at flying in blue thermals except for the odd spectacular >> trough day which will have very high based cu and high convection. I've >> been to 16500 feet in blue thermals there. Much like South Australia but >> without a large river for irrigation fed by the Great Divide. >> >> The dry ground and only a little bit of dry stubble left means there sure >> as heck isn't a lot of evaporation (latent heat flux) as there isn't any >> water in the vegetation. In the scrub the stunted poor excuses for trees >> will however still evapo-transpire so in summer there will be more latent >> heat flux there. In August the rains are still happening in the crop >> growing areas with higher rainfall so that's where the latent heat flux is >> greater than in the scrub. >> >> Nothing all that surprising in that paper. >> >> What isn't obvious is the salinity problem. Lots of salt lakes and salt >> coming to the surface as a result of tree clearing. This has been >> addressed since the mid 1970s with replanting and other mitigation methods. >> >> >> >> Mike >> >> >> >> >> >> >> >> >> >> At 06:49 PM 9/06/2014, you wrote: >> >> Thanks Robert, >> >> Just to clarify for me. >> >> "The latent heat flux is the movement of heat energy from the surface >> to altitude associated with the evaporation of water at the surface and its >> condensation at altitude in clouds." >> >>  I take it that, Latent heat flux is one of the effects which generates >> thermals. The other is sensible heat ie ground gets hot, transfers heat >> to near surface air by conduction. Air then rises (convection). >> >> Do you have any thoughts on why the natural vegetation (we used to call >> it scrub) has a strong bias to Latent Heat Flux in December but not in >> August? >> >> >> On Sun, Jun 8, 2014 at 11:17 AM, Robert Hart <[email protected]> >> wrote: >> >> On 08-Jun-14 08:44, Peter Champness wrote: >> >> That seems right. They should have asked glider pilots. >> >> I note that the paper shows that the latent heat flux is strongly skewed >> to the native vegetation areas in Dec (soaring season). In August it is >> the other way, higher over the agricultural areas. >> >> I assume latent heat flux means avapoeration. >> >> >> >> Latent heat is the heat absorbed or released during a phase change (ie >> solid/liquid/gas phases). In water, there is very significant latent heat >> involved in evaporating water which is then released when the water vapour >> recondenses to liquid water (droplets) in clouds. >> >> The latent heat flux is the movement of heat energy from the surface to >> altitude associated with the evaporation of water at the surface and its >> condensation at altitude in clouds. >> >> As flatland glider pilots, we ride this flux in the form of thermals >> generated by a number of effects. >> >> -- >> >> Note: I am changing my email address - please only use my gmail address >> from now on! >> >> Robert Hart                          >> [email protected] >> >> +61 438 385 533 >> >> _______________________________________________ >> >> Aus-soaring mailing list >> >> [email protected] >> >> To check or change subscription details, visit: >> >> http://lists.internode.on.net/mailman/listinfo/aus-soaring >> >> >> _______________________________________________ >> Aus-soaring mailing list >> [email protected] >> To check or change subscription details, visit: >> http://lists.internode.on.net/mailman/listinfo/aus-soaring >> >> *Borgelt Instruments *- >> *design & manufacture of quality soaring instrumentation since 1978 * >> www.borgeltinstruments.com >> tel: 07 4635 5784 overseas: int+61-7-4635 5784 >> mob: 042835 5784 : int+61-42835 5784 >> P O Box 4607, Toowoomba East, QLD 4350, Australia >> >> _______________________________________________ >> Aus-soaring mailing list >> [email protected] >> To check or change subscription details, visit: >> http://lists.internode.on.net/mailman/listinfo/aus-soaring >> > >
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