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Sent from my iPad > On 10 Jun 2014, at 22:01, Peter Champness <plchampn...@gmail.com> wrote: > > How do I post a new thread? > > >> On Tue, Jun 10, 2014 at 9:01 PM, Peter Champness <plchampn...@gmail.com> >> 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 <gstev...@bigpond.com> >>> 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: aus-soaring-boun...@lists.internode.on.net >>> [mailto:aus-soaring-boun...@lists.internode.on.net] 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: aus-soaring-boun...@lists.internode.on.net >>> [mailto:aus-soaring-boun...@lists.internode.on.net] 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 <crispin...@gmail.com> 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                          >>> crispin...@gmail.com >>> >>> +61 438 385 533 >>> >>> _______________________________________________ >>> >>> Aus-soaring mailing list >>> >>> Aus-soaring@lists.internode.on.net >>> >>> To check or change subscription details, visit: >>> >>> http://lists.internode.on.net/mailman/listinfo/aus-soaring >>> >>> >>> _______________________________________________ >>> Aus-soaring mailing list >>> Aus-soaring@lists.internode.on.net >>> 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 >>> Aus-soaring@lists.internode.on.net >>> To check or change subscription details, visit: >>> http://lists.internode.on.net/mailman/listinfo/aus-soaring > > _______________________________________________ > Aus-soaring mailing list > Aus-soaring@lists.internode.on.net > To check or change subscription details, visit: > http://lists.internode.on.net/mailman/listinfo/aus-soaring
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