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#11
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Alternative magnetic compass
On Thursday, October 29, 2015 at 11:21:11 AM UTC-4, jfitch wrote:
I wonder how many sailplanes have the required magnetic deviation card for their required compass. Wrong question! How many have actual values, and how many have made up nonsense to satisfy the inspector? See ya, Dave |
#12
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Alternative magnetic compass
From the LAK-17a Flight Manual:
For cloud flying the following additional equipment is required: - variometer; - magnetic compass compensated in the sailplane; - turn and bank indicator, non-icing; - transceiver; - parachute, automatic or manual opening type; - thermometer for outside air; - non-icing airspeed system. The minimum equipment must correspond with national regulations. I've been instrument rated for about 41 years and I don't know what a non-icing turn and bank indicator is or how it works. Could someone enlighten me, please? And let's not forget the pitot /and/ static heat! Maybe total energy probe heat, as well. There's a mag compass mounted at the far forward end of my glare shield (probably from the factory) with a nice, flat black aluminum hood over it. It's below the level of the plexiglass and unobtrusive and I practically never look at it. Instead, I use that mountain 100 miles distant to orient myself. On 10/28/2015 10:12 PM, SoaringXCellence wrote: Oops, I stand corrected, the TCDS for the Libelle requires a compass, HOWEVER, the pilot manual says that the compass is only required for cloud flying. -- Dan, 5J |
#13
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Alternative magnetic compass
Snip
I wonder how many sailplanes have the required magnetic deviation card for their required compass. /Snip Shhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh..... -- Dan, 5J |
#14
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Alternative magnetic compass
I just googled searched for photos of F-22 and F-35 cockpits and instrument panels, did not see a compass. Sure there is a gryo, but could not find a non electronic compass. I too think it is a relic of days gone by. I have three gps' in my bird, a selection of three batteries with turtle deck solar panels, I can use to power the instrument cluster and each instrument is individually fused. As a back up I have an iPhone, and maps where by I can align the topographic features to what I see outside, thus determine the rough compass headings.
In 4,500 hours of flying I have only used a vertical card compass to determine the direction of the runway while approaching an airport. Now with my moving map, I think I shall not even do that. |
#15
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Alternative magnetic compass
On Thursday, October 29, 2015 at 1:30:07 PM UTC-4, Jonathan St. Cloud wrote:
I have three gps' in my bird... Shocking. Time to upgrade. Minimum equipment: PowerFlarm Logger#2 AHRS w/GPS Personal tracker 406ELT w/GPS iPhone w/GPS Obviously you're way behind! And probably not enough batteries either ;-) |
#16
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Alternative magnetic compass
A non-icing turn and bank is one that is electrically driven or powered by a vacuum pump instead of an external venturi. Walk around a small airport and you're almost certain to see older light aircraft with large external venturis used to drive the gyros. Look at enough old pictures of gliders and you'll even see them there on occasion. The drawback of using a venturi to drive blind flying instruments in the clouds should be pretty obvious.
I've got an up to date correction card in my glider. Anyone ever try flying a compass course accurate to within 2 degrees in a sailplane? Good for a laugh. |
#17
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Alternative magnetic compass
I used my compass to advantage this Fall (for the first time ever) when working a narrow band of rotor lift at relatively low altitude with a head wind speed that was slower than my stall speed.
I'd fly out of the rotor lift and into sink after flying straight for about 20 seconds, turn around fast and fly downwind on the opposite compass heading to roughly above my ground reference point, then fly the same upwind compass heading repeatedly. I eventually climbed a couple thousand feet into weak wave. (I really enjoy working rotor). Moving map was turned off. Perhaps the moving map would have made it too easy, and I would have missed the 'learning experience' of working rotor without the moving map. I'd add that the 'compass swing' was irrelevant to this exercise as the headings that I used were just arbitrary (but repeatable) numbers. Call me 'old school' but I also feel that it is beneficial to the improvement of my 'seat of the pants' skills for me to center thermals without 'Digital Thermal Assistants'. |
#18
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Alternative magnetic compass
Canadian Regulation Gliders — Day VFR
605.21 No person shall operate a glider in day VFR flight unless it is equipped with (a) an altimeter; (b) an airspeed indicator; (c) a magnetic compass or a magnetic direction indicator; and... There's a few varios with that capability. A computer with moving map that shows magnetic bearing should also satisfy this reg. The chance that a Transport Canada inspector would make a fuss over a single seater without a compass is close to zilch, but the guy who signs your annual needs some coverage. |
#19
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Alternative magnetic compass
On Thursday, October 29, 2015 at 11:10:28 AM UTC-7, Dave Nadler wrote:
On Thursday, October 29, 2015 at 1:30:07 PM UTC-4, Jonathan St. Cloud wrote: I have three gps' in my bird... Shocking. Time to upgrade. Minimum equipment: PowerFlarm Logger#2 AHRS w/GPS Personal tracker 406ELT w/GPS iPhone w/GPS Obviously you're way behind! And probably not enough batteries either ;-) I have 5: Air Avionics ISU PowerFlarm iPhone 6+ used for iGlide iPhone 5s used for cell phone Delorme Inreach Nevertheless, in the unlikely event of an EMP or the more likely event of GPS interference/unavailability, none will work. But I have never flown a compass course in a glider. In VFR, you don't need it; in IFR, it is insufficient without an AHRS, and then you don't need it. Conclusion: you don't need it. |
#20
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Alternative magnetic compass
Jon, thought I had four GPS devices but if you're counting phones, etc....
ClearNav vario ClearNav 2 Air-Glide vario PowerFLARM APRS InReach "Phone" Realised a week or so ago that there is no vario needle in the panel. Just triangles, lines and dots. But there's a mysterious liquid-filled instrument near the bottom of the panel that has numbers on a wobbly thing inside. It's not on the minimum equipment list. Should probably be stored somewhere with a sextant and knotted rope or the vacuum tube NAV radio from an Illyushin IL-76. Jim |
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