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This is a discussion on Altimeter in the plane, does it work? within the Suunto 6 Series forums; Does any one know if the altimeter in a Suunto watch works while in the plane? I have a Casio ...
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| Altimeter in the plane, does it work? Does any one know if the altimeter in a Suunto watch works while in the plane? I have a Casio Pathfinder, but the altimeter does not work in the plane. How about the compass, does it work as well? Thanks, Raxxal Last edited by raxxal; 04-30-2004 at 07:42 PM. |
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| Air pressure must be measured to estimate altitude. So, if you are in a plane that does not adjust air pressure, it will work -- at least a little. You may find it sluggish during fast elevation changes. However, you are probably concerned with commercial flights & I'd be surprised if you find any that don't adjust air pressure. |
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| altitude on plane It does work as long as you're not in a pressurized cabin. I've used my X6HR to measure and log flights in both a glider and private aircraft. Makes for some very interesting profiles. All commercial flights are pressurized, and since the Suunto uses barometric pressure to estimate altitude, it doesn't work on these. The average long haul flight has a cabin pressure equivalent to being about 6000 feet above sea level. The compass does seem to work on all flights. |
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| the altimeter works by measuring air pressure. In a pressurized cabin, it will not work. Do know that the altimeter for watches work by giving relative readings and not absolute readings. |
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| The cabin pressure control system continuously monitors the airplane’s ground and flight modes, altitude, climb, cruise, or descent modes as well as the airplane’s holding patterns at various altitudes. It uses this information to allow air to escape continuously from the airplane by further opening or closing the cabin pressure outflow valve in the lower aft fuselage. The outflow valve is constantly being positioned to maintain cabin pressure as close to sea level as practical, without exceeding a cabinto- outside pressure differential of 8.60 psi. Figure 10 shows the 767 cabin altitude schedule. At a 39,000-foot cruise altitude, the cabin pressure is equivalent to 6,900 feet or a pressure of 11.5 psi (about 450 feet less than Mexico City). In addition, as the airplane changes altitude, the outflow valve repositions itself to allow more or less air to escape. The resulting cabin altitude is consistent with airplane altitude. This is accomplished within the constraints of keeping pressure changes comfortable for passengers. Normal pressure change rates are 0.26 psi per minute ascending and 0.16 psi per minute descending. The graph (somewhat concave) is availalabe here: http://www.boeing.com/commercial/cabinair/ecs.pdf page 6 (bottom) Just eyeballing the table gives the following approximate results: (cabin alt-> real alt) (1,000->10,000) (2,000->18,000) (3,000->25,000) (4,000->30,000) (5,000->33,000) (6,000->36,000) (7,000->39,000) (8,000->42,000) Last edited by roadcoach; 03-20-2010 at 12:54 AM. |
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| Quote:
.Tho one more option would be to get Suunto X9/X10 and get altitude from GPS. It's not that accurate but sure it would be more accurate than barometric pressure inside the closed system created inside the pressurized cabin. |
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| Not all Airlines permit the use of a GPS Here is a list of those that do NOT permit the use...Alaska Airlines Air Tran America West Airlines American Airlines (Changed again as of October 2009) Britannia Airlines El Al Airlines (Israel) Frontier Airlines (as of June 2008) Hawaiian Airlines(*) Horizon Airlines(*) Iberia Airlines(*) Lufthansa Airlines Mexicana airlines Midway Express Monarch Airlines Ryanair (Irish) (as of January 2008) Spirit Airlines US Airways (was US Air) (as of December 2007) Varig Airlines Virgin Airlines (As of March 2007) see I want my GPS! - USATODAY.com and list of airlines as of October 2009 Airlines which APPROVE/DISPROVE GPS use in Flight Last edited by roadcoach; 03-29-2010 at 03:26 PM. |
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| Oh that's interesting. Would you also have idea why do they forbid using GPS devices on board? I know basically all providers are banning any electrical devices while take off, landing and taxi. But during flight you are usually permited to use devices like mp3 players. Mobiles phones still being banned on most flights. Could possibly getting GPS signal (you are not really transmitting no?) interfere with flight operating devices? Not even mobiles do interfere in any significant scale, it's just security measure. But then again, mobiles do transmit actively... |
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