JUSTNUZZA

Phil if you use the NAIPS ipad app it has a save feature for area and location weather information. The app is also made by the Ozrunways boys. The app also makes it very easy to submit a SARTIME.

Looks like another good invention is on the way ! www.satcase.com/ SATcase equips smartphones with global coverage. UK-based SATcase has launched a satellite communications device of the same name.

Done !

Good work Jabiru7252 !!

From Wikipedia, the free encyclopedia "Vapor Trail" redirects here. For other uses, see Vapor Trail (disambiguation). For other uses, see Contrail (disambiguation). Cirrus aviaticus Contrails (/ˈkɒntreɪlz/; short for "condensation trails") or vapor trails are long thin artificial (man-made) clouds that sometimes form behind aircraft. Their formation is most often triggered by the water vapor in the exhaust of aircraft engines, but can also be triggered by the changes in air pressure in wingtip vortices or in the air over the entire wing surface.[1] Like all clouds, contrails are made of water, in the form of a suspension of billions of liquid droplets or ice crystals. Depending on the temperature and humidity at the altitude the contrail forms, they may be visible for only a few seconds or minutes, or may persist for hours and spread to be several miles wide. Persistent spreading contrails are thought to have a significant effect on global climate.[2] Condensation from engine exhaust The main products of hydrocarbon fuel combustion are carbon dioxide and water vapor. At high altitudes this water vapor emerges into a cold environment, and the local increase in water vapor can raise the relative humidity of the air past saturation point. The vapor then condenses into tiny water droplets which freeze if the temperature is low enough. These millions of tiny water droplets and/or ice crystals form the contrails. The time taken for the vapor to cool enough to condense accounts for the contrail forming some way behind the aircraft's engines. At high altitudes, supercooled water vapor requires a trigger to encourage deposition or condensation. The exhaust particles in the aircraft's exhaust act as this trigger, causing the trapped vapor to rapidly condense. Exhaust contrails usually occur above 8,000 m (26,000 ft), and only if the temperature there is below −40 °C (−40 °F). Condensation from decreases in pressure Main article: Wingtip vortices As a wing generates lift, it causes a vortex to form at each wingtip, and sometimes also at the tip of each wing flap. These wingtip vortices persist in the atmosphere long after the aircraft has passed. The reduction in pressure and temperature across each vortex can cause water to condense and make the cores of the wingtip vortices visible. This effect is more common on humid days. Wingtip vortices can sometimes be seen behind the wing flaps of airliners during takeoff and landing, and during landing of the Space shuttle. The visible cores of wingtip vortices contrast with the other major type of contrails which are caused by the combustion of fuel. Contrails produced from jet engine exhaust are seen at high altitude, directly behind each engine. By contrast, the visible cores of wingtip vortices are usually seen only at low altitude where the aircraft is travelling slowly after takeoff or before landing, and where the ambient humidity is higher. They trail behind the wingtips and wing flaps rather than behind the engines. During high-thrust settings the fan blades at the intake of a turbo-fan engine reach transonic speeds, causing a sudden drop in air pressure. This creates the condensation fog (inside the intake) which is often observed by air travelers during takeoff. For more information see the Prandtl-Glauert singularity effect. Anti-contrail measures Military aircraft take precautions to avoid contrails which greatly enhance visual detection ranges, including choice of altitude. Contrails and climate Contrails, by affecting the Earth's radiation balance, act as a radiative forcing. Studies have found that contrails trap outgoing longwave radiation emitted by the Earth and atmosphere (positive radiative forcing) at a greater rate than they reflect incoming solar radiation (negative radiative forcing). Global radiative forcing has been calculated from the reanalysis data, climatological models and radiative transfer codes. It is estimated to amount to 0.012 W/m2 for 2005, with an uncertainty range of 0.005 to 0.0026 W/m2, and with a low level of scientific understanding.[4] Therefore, the overall net effect of contrails is positive, i.e. a warming effect.[5] However, the effect varies daily and annually, and overall the magnitude of the forcing is not well known: globally (for 1992 air traffic conditions), values range from 3.5 mW/m2 to 17 mW/m2. Other studies have determined that night flights are mostly responsible for the warming effect: while accounting for only 25% of daily air traffic, they contribute 60 to 80% of contrail radiative forcing. Similarly, winter flights account for only 22% of annual air traffic, but contribute half of the annual mean radiative forcing.[6] September 11, 2001 climate impact study [edit] The grounding of planes for three days in the United States after September 11, 2001 provided a rare opportunity for scientists to study the effects of contrails on climate forcing. Measurements showed that without contrails, the local diurnal temperature range (difference of day and night temperatures) was about 1 °C (1.8 °F) higher than immediately before;[7] however, it has also been suggested that this was due to unusually clear weather during the period.[8] Condensation trails have been suspected of causing "regional-scale surface temperature" changes for some time.[9][10] Researcher David J. Travis, an atmospheric scientist at the University of Wisconsin-Whitewater, has published and spoken on the measurable impacts of contrails on climate change in the science journal Nature and at the American Meteorological Society's 10th Annual conference in Portland, Oregon. The effect of the change in aircraft contrail formation on the three days after the 11th was observed in surface temperature change, measured across over 4,000 reporting stations in the continental United States.[9] Travis' research documented an "anomalous increase in the average diurnal temperature change".[9] The diurnal temperature range (DTR) is the difference in the day's highs and lows at any weather reporting station.[11] Travis observed a 1.8 °C (3.24 °F) departure from the two adjacent three-day periods to the 11th–14th.[9] This increase was the largest recorded in 30 years, more than "2 standard deviations away from the mean DTR".[9] Head-on contrails A contrail from an airplane flying towards the observer can appear to be generated by an object moving vertically.[12][13] On November 8, 2010 in California, U.S., a contrail of this type gained wide media attention as a "mystery missile" that could not be explained by U.S. military and aviation authorities,[14] and its explanation as a contrail[12][13][15][16] took more than 24 hours to become accepted by U.S. media and military institutions.[17] Distrails A distrail is the opposite of a contrail. This rare photograph of a young distrail was photographed on November 22, 2012 in Hong Kong. Distrail is short for "dissipation trail". Where an aircraft passes through a cloud, it can clear a path through it; this is known as a distrail. Because the plane's contrail is not yet visible (contrails usually form above 8,000 meters/26,000 feet, depending on the temperature and other factors) a distrail looks like a tunnel through the cloud if the cloud is very thin.[18] Distrails are created by the elevated temperature of the exhaust gases absorbing the moisture from the cloud. Clouds exist where the relative humidity is 100% but by increasing the temperature the air can hold more moisture and the relative humidity drops below 100%, even for the same absolute moisture density, causing the visible water droplets in the cloud to be converted back into water vapor.

Sorry Ian, Thread should be in engine and prop section.

Can someone advise me on what brand fuel and oil hoses to use on 5 year replacement that are not part of the Rotax system. Example oil hoses to oil cooler and fuel hoses to gascolator ? I know to use the kit from Rotax for the rest of the rubber replacements.

ACKNOWLEDGE

Thanks for your help Nathan and Myria. I think 4.21.1 d also sums it up. 4.21.1 When establishing 2-way communications and for subsequent communications on any frequency, Australian registered aircraft must use one of the following callsigns: a. for VH-registered aircraft, the last 3 characters of the registration marking (eg VH-TQK “TANGO QUEBEC KILO”); or b. the approved telephony designator of the aircraft operating agency, followed by the last 3 characters of a VH registration marking (eg “QLINK TANGO QUEBEC KILO”); or c. the approved telephony designator of the aircraft operating agency, followed by the flight identification (eg “VIRGIN EIGHT FIFTY SIX DELTA”); or d. for recreation-category aircraft, the aircraft type followed by the last 4 characters of the aircraft’s registration number (eg “JABIRU THIRTEEN FORTY SIX”).

Can someone please inform me when pronouncing the last four digits of your registration number on the radio can they be grouped together ? For example my Callsign is STRATUS 7357. Can it be pronounced STRATUS SEVENTY THREE FIFTY SEVEN or does it need to be STRATUS SEVEN THREE FIVE SEVEN ?

Went solo in the IS28 today !

I Saw the guy in the the Yak take the Pitts for a test run.

Today was the start to some further aviating knowledge. I have ventured to Southern Riverina Gliding Club at YTOC to begin spin training in the club two seat trainer. Certainly gets the heart racing as you pull hard back on the elevator to stall then boot in full aileron and rudder as you feel like nearly falling out of your seat as you drop into the spin then watching the earth rush towards you below. Bring on tomorrow !!

Can Can any of this be achieved on an ipad ?

Does anyone know how to convert large photo files to smaller ones to upload to the photo album section on this site ?

The bi

Notice for LSAs With in-flight Adjustable Prop February 22, 2013 | RA-Aus Administrator NOTICE TO ALL OWNERS AND OPERATORS OF LIGHT SPORT AIRCRAFT FITTED WITH IN-FLIGHT ADJUSTABLE PROPELLERS During a recent CASA audit of RAAus aircraft files it was discovered that many Light Sport aircraft (LSA) are fitted with in-flight adjustable propellers that do not comply with elements of the certificate of compliance. At present there are standards acceptable to CASA for these propellers which allow them to be fitted to Light Sport aircraft but so far no manufacturer has listed an approved standard in the appropriate section of the signed statement of compliance required for LSA. If you own or operate a Light Sport aircraft fitted with an in-flight adjustable propeller please contact the RAAus Technical Consultant on 0408 351 309 for further advice. Dean Tompkins Technical Manager

Check their website. Mine was 24 rego until recently also. The prop has to be certified or ground adjustable to comply with 24 rego.

They are factory built. It is because the prop is a CSU and not certified that it has to be ELSA rego. same thing happened to my Roko Aero Ng4.

I Had access to class D to fly into YMAV Avalon

Called Bert Floods and they recommend Panasonic LC-XC1221p. 21amp hour battery.

Thanks I will call rotax and see what they recommend Thsnkd

Just would like to know what size battery people are using in their 912uls. Dimensions, CCA and Ah would be good to know.

Does not even look close to the aerodynamics of the Blackshape. Tail and wings maybe, but not the cockpit. The Blackshape was looking into 600kg certification .