| T O P I C R E V I E W |
| asaronnie |
Posted - 23/03/2012 : 20:12:20
Please, what is the difrerence between Eficiency and glide ratio ?
In LK i found this functions, and i guees they mean:
Average efficiency - Average eff for all the fligth
Task req Efficiency - Eff req to finish the task
Next req Efficiency -Eff req to reach the WP
Eff last 20 sec - Average eff for the last 20 seconds
But i didnīt found the actual efficiency, please, can you tell me teh name
of teh fuctions that shows the last 1 second eff?
And, this number called ''eff'' is not the same as Glide ratio rigth ? |
| 4 L A T E S T R E P L I E S (Newest First) |
| eric.carden |
Posted - 04/04/2012 : 23:43:21
Yep. You're welcome.
Eric |
| asaronnie |
Posted - 04/04/2012 : 21:52:36
THANK YOU FOR THE EXPLANATION ERIC.
SO EFF IS THE SAME THING THAN GR ABOVE THE GROUND.
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| Coolwind |
Posted - 03/04/2012 : 21:04:05
Garmin is using GR, if I am not wrong. LX is using Eff.
Honestly I dont know which one is better, and we must consider all translations also.
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| eric.carden |
Posted - 03/04/2012 : 20:51:10
Hi asaronnie,
Here's a forum topic started last fall about this very thing, the often-confusing term "efficiency" as used in LK: http://www.postfrontal.com/forum/topic.asp?TOPIC_ID=5528.
I'll take a stab at answering your questions, though:
quote:
what is the difrerence between Eficiency and glide ratio ?
Technically, the term "efficiency" means lift-to-drag ratio, or L/D, and defines a wing's performance at a given angle of attack. In LK, however, the term "efficiency" is used to mean glide ratio (relative to the ground). So while flying my hang glider straight into a 30 mph wind at an airspeed of 30 mph, my aerodynamic efficiency, or L/D, may be 10:1, but my "efficiency" as reported by LK will be zero (my glide ratio relative to the ground).
quote:
Average efficiency - Average eff for all the fligth
This is your average glide ratio over the ground during the previous length of time defined by the "L/D Average Period" setting on system config menu 5 (Glide Computer). The available averaging periods are from 3 seconds to 3 minutes.
I think you're right about the other three values' meanings, realizing that "eff" means "glide ratio over the ground".
quote:
But i didnīt found the actual efficiency, please, can you tell me teh name
of teh fuctions that shows the last 1 second eff?
I don't believe LK offers your actual aerodynamic efficiency (L/D, airspeed/sinkrate), since so few users have airspeed sensors or barometric pressure variometers connected. Any value LK could compute for that (without these sensors) would be of somewhat questionable accuracy.
Feel free to add your thoughts in the above forum topic. It looks like the consensus was to change LK to say "glide ratio" (GR) instead of "efficiency" (eff), but we apparently just never got around to actually doing it. :-)
Eric |
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