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#81
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AA Butterfly versus CNv LCD wind calculation
No mechanical vario for me.
I have 2 separate battery circuits (tail & main, both supported by solar) and the LXNav S10/100 has an internal battery backup for all functions (up to 4 hours). I felt like a mechanical vario was a waste of panel as a total power loss results no audio vario or navigation (or logging). I also use a nano for a logger backup. And of course mechanical varios require a bottle (PITA). Sean |
#82
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AA Butterfly versus CNv LCD wind calculation
I use mechanical vario to get more info from airmass, not as a backup. I have never experienced electrical variometer failure (nor heard of one), and if I did, that would not even remotely be classified as a problem, more like a minor inconvenience. Only backup I have is second battery.
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#83
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AA Butterfly versus CNv LCD wind calculation
It's not undisturbed air. On my ex Stemmes , serial 11-18, the nose TERRY was severely under compensatedevelopment due to the bow wave. I increased the TE "washer" size to 3/4" IIRC and that helped a lot. Other Stemmed owners followed suit and agreed. Stemmes did not come stock with fin mounted probes then, some owners got them when the issue became known.
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#84
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AA Butterfly versus CNv LCD wind calculation
Le mardi 27 septembre 2016 08:11:20 UTC+2, krasw a écritÂ*:
I use mechanical vario to get more info from airmass, not as a backup. I have never experienced electrical variometer failure (nor heard of one), and if I did, that would not even remotely be classified as a problem, more like a minor inconvenience. Only backup I have is second battery. Why would a mechanical vario give you more information on airmass? |
#85
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AA Butterfly versus CNv LCD wind calculation
On Tuesday, 27 September 2016 11:15:02 UTC+3, Tango Whisky wrote:
Why would a mechanical vario give you more information on airmass? That is interesting question. If it would give identical information, the varios should read exactly the same. They obviously are not, so they are either measuring TE pressure differently, or one of them is measuring same thing but poorly (which I don't agree with, in some gusting thermals my Bohli reacts more realistically than electric vario). I feel getting two "opinions" from same thing is advantage (three actually if you count inertial variometer). Heck, I would gladly install fourth variometer if that tells me something new, instead of duplicating something I already have. |
#86
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AA Butterfly versus CNv LCD wind calculation
Only compass that works as a data source for wind vector calculations, to my knowledge, is the Zander's. Of course, it is part of the Zander system (can't add the Zander compass interface to instruments by other manufacturers).
I would discourage anyone from adding an electronic compass module to their existing computers, as it's just not working properly. Probably due to extreme sensibility to pitch changes, and software unable to correct that. If on a low budget, buy a working, used Zander set. If on a higher budget, try the newer inertial varios. I agree that accurate and real-time wind calculation is of very high interest to soaring techniques. I used it for years and I just can't adapt to fly woithout it. all IMVHO, of course! Aldo Cernezzi It is not enough to throw in electric compass if the system is not up to it. Many variometer systems have compass option that manufacturers do not use for any meaningful data. Representative of one company told me of pilot who was very happy after installing optional compass module. He didn't have the heart to tell pilot that variometer firmware version couldn't use compass data at all. I always take pilot reports with a grain of salt. |
#87
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AA Butterfly versus CNv LCD wind calculation
In the past I flew an old Stemme S10V for many hours. Loved it, but vario was very undercompensated.
Would love you to expand on the "washer" mod. I just can't figure what you mean. thanks! Aldo Cernezzi Il giorno martedì 27 settembre 2016 10:13:43 UTC+2, bumper ha scritto: It's not undisturbed air. On my ex Stemmes , serial 11-18, the nose TERRY was severely under compensatedevelopment due to the bow wave. I increased the TE "washer" size to 3/4" IIRC and that helped a lot. |
#88
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AA Butterfly versus CNv LCD wind calculation
On Monday, September 26, 2016 at 10:35:58 AM UTC-5, krasw wrote:
On Monday, 26 September 2016 17:24:02 UTC+3, Richard wrote: On Sunday, September 25, 2016 at 11:15:12 PM UTC-7, krasw wrote: On Monday, 26 September 2016 04:25:15 UTC+3, Sean wrote: LXNav S10 backup this spring for my new panel. I do not think the butterfly is worth the price... SMF 7T What are you backing up with S10? Don't you have mechanical vario? No need for a mechanical backup the S10 has an internal backup battery for 3 hrs of use. Richard www.craggyaero.com Never heard of anyone not having a mechanical vario in glider. No mechanical vario for me over the last 15 years. Never missed it. My standby is a Westerboer with pressure sensors, compensated on the same line as my 302. I also have an A-B battery switch. Herb J7 |
#89
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AA Butterfly versus CNv LCD wind calculation
On Friday, September 23, 2016 at 2:56:58 PM UTC-4, wrote:
... sensor unit needs to be mostly well clear of any magnets or any moving ferrous control rods. It turns out that most of our gliders have been magnetized a bit in their lifetime. Dave Nadler told me that they tried to incorporate some sort of compass data in the SN10 but were unable to overcome that obstacle. We researched this long time ago. One test placed a sensor inside canopy on top of pilot to minimize magnetic distractions during testing. The pilot was shocked when, after releasing from tow, he retracted the gear and the compass swung 15 degrees! IIRC ILEC's LS-8 had very highly magnetized gear linkage components. Ultimately we decided then current technology would not give enough benefit over our no-compass algorithm, and wouldn't be glider-pilot-proof for installation... so did not bring the compass to market... ...As a side note, after years of flying with the Ilec SN10 I think it is still the best at computing and displaying average winds. Thanks, you are not alone ;-) |
#90
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AA Butterfly versus CNv LCD wind calculation
tiistai 27. syyskuuta 2016 16.50.57 UTC+3 kirjoitti:
Only compass that works as a data source for wind vector calculations, to my knowledge, is the Zander's. Of course, it is part of the Zander system (can't add the Zander compass interface to instruments by other manufacturers). I would discourage anyone from adding an electronic compass module to their existing computers, as it's just not working properly. Probably due to extreme sensibility to pitch changes, and software unable to correct that. If on a low budget, buy a working, used Zander set. If on a higher budget, try the newer inertial varios. I agree that accurate and real-time wind calculation is of very high interest to soaring techniques. I used it for years and I just can't adapt to fly woithout it. all IMVHO, of course! Aldo Cernezzi Even Zander compass was very sensitive to installation. I installed one Zander system to a LS8 for WGC years ago and calibrated it with factory calibration compass. It worked fantastically giving very accurate readings. After that my club bought similar system to D2 and it didn't work at all, even after many calibration attempts. I have flown third glider with similar setup, and that also did not work. We never understood why. With current knowledge of compass sensor installation problems, there might have been speaker or something too close to compass. |
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