December 23, 200421 yr On several occasions my speedometer has jumped back to zero. And when I hit the up arrow plus Z all the information abour height, frame rate etc works normally exept the speed which shows zero.It's just happened again while flying the Cessna C172SP Skyhawk.Is this a problem that can be overcome?Cliff
December 23, 200421 yr "Is this a problem that can be overcome?"Are you turning on the pitot heat?Greg
December 24, 200421 yr Greg you've probably hit the nail on the head and I've learned something from you.I had downloaded real weather; it was snowing as I flew between the mountains.And the answer is "No". I didn't turn on the pitot heat.Thanks pal!Regards,Cliff
December 24, 200421 yr Was about to tell you the EXACT same thing. Pitot heat becomes essential in the winter time. :)
December 24, 200421 yr I use pitot heat all the time, no matter what. I don't have Active Sky, yet, but have had planes go back to 0 KIAS, even with pitot heat on! Does Active Sky eliminate this problem, or do you even know? - Chris Gigabyte Z790 Aorus Elite AX | Intel Core i9 13900KF | Gigabyte GeForce RTX 4090 24 GB | 64GB DDR5 SDRAM | Corsair H100i Elite 240mm Liquid Cooling | 1TB & 2TB Samsung Gen 4 SSD | 1000 Watt Gold PSU | Windows 11 Pro | Thrustmaster Boeing Yoke | Thrustmaster TCA Captain X Airbus | Asus ROG 38" 4k IPS Monitor (PG38UQ) Asus Maximus VII Hero motherboard | Intel i7 4790k CPU | MSI GTX 970 4 GB video card | Corsair DDR3 2133 32GB SDRAM | Corsair H50 water cooler | Samsung 850 EVO 250GB SSD (2) | EVGA 1000 watt PSU - Retired
December 24, 200421 yr >I use pitot heat all the time, no matter what. I don't have>Active Sky, yet, but have had planes go back to 0 KIAS, even>with pitot heat on! Does Active Sky eliminate this problem,>or do you even know?Afair "Random icing" feature in FSUIPC can cause drop to 0 KIAS even if pitot heating is on.
December 24, 200421 yr I have had this problem as well, with pitot heat on. Happened yesterday while decending into Anchorage in snow, with real world weather. Speed dropped to zero for about 15 seconds then back to normal. I think CTRL-H is the shortcut for Pitot heat and you can try this when you find the speed drops off. I have FSUIPC set such that it does NOT provide random icing.Mark. Mark CYYZ
December 24, 200421 yr See this relevant thread:http://forums.avsim.net/dcboard.php?az=sho..._id=2795&page=2RegardsBob ScottATP IMEL Gulfstream II-III-IV-V L-300Washington, DC Bob Scott | President and CEO, AVSIM Inc ATP Gulfstream II-III-IV-V Sys1 (MSFS20+24/XPlane12+11): AMD 9800X3D, water 2x240mm, MSI MPG X670E Carbon, 64GB GSkill 6000/30, nVidia RTX4090FE Alienware AW3821DW 38" 21:9 GSync, 2x4TB Crucial T705 PCIe5 + 2x2TB Samsung 990 SSD, EVGA 1000P2 PSU, 12.9" iPad Pro Thrustmaster TCA Boeing Yoke, TCA Airbus Sidestick, Twin TCA Airbus Throttle quads, PFC Cirrus Pedals, Coolermaster HAF932 case Sys2 (P3Dv5/v4): i9-13900KS, water 2x360mm, ASUS Z790 Hero, 32GB GSkill 7800MHz CAS36, ASUS RTX4090 Samsung 55" JS8500 4K TV@60Hz, 3x 2TB WD SN850X 1x 4TB Crucial P3 M.2 NVME SSD, EVGA 1600T2 PSU Fiber link to Yamaha RX-V467 Home Theater Receiver, Polk/Klipsch 6" bookshelf speakers, Polk 12" subwoofer, 12.9" iPad Pro PFC yoke/throttle quad/pedals with custom Hall sensor retrofit, Thermaltake View 71 case, Stream Deck XL button box Sys3 (DCS/P3Dv4/ATS/ETS): AMD 7800X3D, MSI MPG X870E Carbon, Noctua NH-D15S, 64GB GSkill 6000/30, EVGA RTX3090 Alienware AW3420DW 34" 21:9 GSync, Corsair HX1000i PSU, 4TB Crucial T705 PCIe5 + 2TB Samsung 970Evo Plus, TM TCA Officer Pack, Saitek combat pedals, TM Warthog, TM RS300 FF wheel/pedals, Coolermaster HAF XB case
December 25, 200421 yr ALWAYS turn on pitot heat before departure. AFAIK, it's standard procedure for most AC? (It is at my PC, anyway LOL). Victor Buck
December 26, 200421 yr Turning Pitot on as you line-up is standard procedure for all aircraft with pitot heaters. Must be switched off when taxying to prevent overheat.There are a few strange manifestations of the FS pitot freezing condition:1) When straight and level in a constant baro pressure, the ASI should freeze in the position that the pitot froze over in, as the air in the pitot line is locked in, it will maintain its pressure. If you climb or descend, then the pitot will kind of act like an altimiter (goes up as you you climb and visa-versa), because of static pressure changes.2) The machmeter should also behave in a similar way. You may have noticed that the machmeter continues to function normally when the ASI is zero!3) It should only freeze in cloud, rain or mist. You don't get icing without being in visible moisture.Well you do get icing when no visible moisture is present, but it is extremely unlikely to result in the pitot freezing over. In such a case the aircraft is said to be "cold soaked" and so light airframe icing can result, especially around the fuel tanks. This can happen when descending quickly from a high altitude. The airframe remains so cold that 'warm' low-alt air condenses and then freezes around it!
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