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#11
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John Galloway wrote:
...the 302A cannot calculate winds and GN11 also does not do a wind calculation when attached to a 302A. Dear John, I appreciate your considered response and don't mean to cast dispersion; however, Are you 100% positive that the 302A cannot calculate winds? This seems odd for any GPS not to be able to do so. Can anyone verify this? RD |
#12
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RD,
I would be delighted to find I am wrong but the 302A we are using gives no indication of outputting a wind calculation in its interaction with a variety of PDA programmes that my partner has tried with it (althout SeeYou Mobile seems to calculate its own circling drift wind when attached to the 302A). Also he has corresponded with Paul Remde (US agent for Cambridge and GN11 as you will know) about this subject and I am sure he would have been able to tell us if this was wrong. I had a look at the 302A manual and it doesn't say it calculates winds - but the 302 manual also has no mention of wind calculation which it does do. The 302 variometer calculates vector winds and not circling drift wind. Take away the pneumatic inputs and it has no way of doing this - even if the computer hardware that allows the 302 to do this isn't removed in the process of turning it into a 302A - which I suspect it will be. John Galloway At 21:54 26 May 2004, Romeo Delta wrote: John Galloway wrote: ...the 302A cannot calculate winds and GN11 also does not do a wind calculation when attached to a 302A. Dear John, I appreciate your considered response and don't mean to cast dispersion; however, Are you 100% positive that the 302A cannot calculate winds? This seems odd for any GPS not to be able to do so. Can anyone verify this? RD |
#13
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Romeo Delta wrote: John Galloway wrote: ...the 302A cannot calculate winds and GN11 also does not do a wind calculation when attached to a 302A. Dear John, I appreciate your considered response and don't mean to cast dispersion; however, Are you 100% positive that the 302A cannot calculate winds? This seems odd for any GPS not to be able to do so. It can't calculate winds during course deviations, like the 302 can, because it doesn't have the airspeed measurement. It might be able to calculate them while circling - don't know about that. -- Change "netto" to "net" to email me directly Eric Greenwell Washington State USA |
#14
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RD: If you choose to go with the B50 (a very good instrument), I can
offer a B50 plus Volkslogger system at 75% of current price. This system was removed from my glider which was sold sans instruments. Both units are in perfect operation. The Volkslogger is the new connector type. Email me direct. I can send photos if needed. Manuals are provided. Steve Koerner Mesa AZ |
#15
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Hi,
I think there may some confusion on what the 302A can and can't do, and a bug in Glide Navigator II. We recently realized that Glide Navigator II had issues with the 302A (GPS/Logger) because it was confusing it with a 302 (GPS/logger/vario). Since the wind data was not being received from the 302A (as it would be from a 302) Glide Navigator II was displaying wind of 0 at all times. Today I tested the bug fix version of Glide Navigator II in flight and it worked great with my 302A. The wind information was displayed and looked correct to me. It should be available on my web site tomorrow (Thursday) evening. So, the answer to the question is that no, I'm pretty sure (but could be wrong) that the 302A does not calculated wind speed and direction. But using soaring flight software like Glide Navigator II or pocket*StrePla (also tested today with my 302A) works great as the software calculates wind speed and direction while thermalling. I don't think Volksloggers calculate wind while circling either. Does that make sense? Good Soaring, Paul Remde Cumulus Soaring, Inc. http://www.cumulus-soaring.com "Romeo Delta" wrote in message om... John Galloway wrote: ...the 302A cannot calculate winds and GN11 also does not do a wind calculation when attached to a 302A. Dear John, I appreciate your considered response and don't mean to cast dispersion; however, Are you 100% positive that the 302A cannot calculate winds? This seems odd for any GPS not to be able to do so. Can anyone verify this? RD |
#16
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If you are looking for a logger that calculates wind speed and
direction, the Colibri will do this and display it on the units screen. Kevin |
#17
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"Paul Remde" wrote:
...the software calculates wind speed and direction while thermalling. Hi Paul, Is GNII able to provide wind and/or ground speed info enroute? Is any nav software able to do either? Ray |
#18
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Romeo Delta wrote:
"Paul Remde" wrote: ...the software calculates wind speed and direction while thermalling. Hi Paul, Is GNII able to provide wind and/or ground speed info enroute? As a user of GNII and a 302: if the GNII is connected to the 302, then yes; if it's connected to "just a GPS" (like my Cambridge model 20), then no. Is any nav software able to do either? The nav software also needs the airspeed information, or heading information (compass). Just a GPS input isn't enough to update wind info while cruising. -- Change "netto" to "net" to email me directly Eric Greenwell Washington State USA |
#19
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"Eric Greenwell" wrote in message ... Romeo Delta wrote: "Paul Remde" wrote: ...the software calculates wind speed and direction while thermalling. Hi Paul, Is GNII able to provide wind and/or ground speed info enroute? As a user of GNII and a 302: if the GNII is connected to the 302, then yes; if it's connected to "just a GPS" (like my Cambridge model 20), then no. Is any nav software able to do either? The nav software also needs the airspeed information, or heading information (compass). Just a GPS input isn't enough to update wind info while cruising. -- Change "netto" to "net" to email me directly Eric Greenwell Washington State USA By "enroute" I think RD meant straight flight. To solve for accurate winds without turning, you need four pieces of data: Ground Track, Groundspeed, True Airspeed and Heading. The first two are available now from GPS. True Airspeed can be obtained with a differential pressure sensor and air temperature. A good heading sensor is the tough nut. I notice that marine navigation vendors are beginning to sell GPS based heading sensors using two antennas and receivers in one box. They're expensive but, being pure electronics, the price will likely come down I know that reasonably accurate wind data can be computed if the glider makes slight turns while gliding between thermals. However, after decades of powered flight, I habitually make very straight glides and the accuracy of the wind data becomes highly suspect. Super accurate wind info while in a straight glider would be very helpful finding convergence zones. Bill Daniels |
#20
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Bill Daniels wrote:
By "enroute" I think RD meant straight flight. To solve for accurate winds without turning, you need four pieces of data: Ground Track, Groundspeed, True Airspeed and Heading. The first two are available now from GPS. True Airspeed can be obtained with a differential pressure sensor and air temperature. A good heading sensor is the tough nut. I notice that marine navigation vendors are beginning to sell GPS based heading sensors using two antennas and receivers in one box. They're expensive but, being pure electronics, the price will likely come down I'm already carrying two gps units, but they don't talk to each other! Maybe mounting a Garmin Geko on each wing tip, then combining their output would give us a heading. Mike B ought to be able to do that with his RS232 combiner box and a small mod to his flight computer software. I know that reasonably accurate wind data can be computed if the glider makes slight turns while gliding between thermals. However, after decades of powered flight, I habitually make very straight glides and the accuracy of the wind data becomes highly suspect. Super accurate wind info while in a straight glider would be very helpful finding convergence zones. Glide Navigator II and probably other software can display the error between measured headwind (using IAS and ground speed) and headwind calculated from the vector wind in use. An error over +/- 2 knots is a good indication the vector wind in use isn't valid anymore. If I care about the wind, I'll update the vector wind calculation by deviating from a straight course, or even making one circle. It's not as good as a system using headings, but it works well most of the time. -- Change "netto" to "net" to email me directly Eric Greenwell Washington State USA |
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