Here is an example when it is important to have instantaneous HW/TW, which is a
common scenario where I fly:
You going on a 70 miles final glide from 10,000 feet AGL with 10 knots tail
wind. You achieving good glide thanks to the head wind and speed up. However
half way through your glide you enter marine air and now you have 10 knots head
wind, but since you didn't make any turn or change of heading, XCSoar or 302
will not know how to correct the wind calculation and will often continue
showing the erroneous tail wind. By the time you realize you are flying into
headwind you are too low and end up landing in a field half a mile short of the
runway. Having an instantaneous HW/TW based on TAS-GS will tell you in time
when the wind changes so you can make the correct decisions.
Ramy
On May 9, 2012, at 8:45 AM, Ramy Yanetz <ryan...@yahoo.com> wrote:
> I am using for years both HW and TAS info boxes side by side so I can do the
> math. I find it always to be far more accurate and instantaneous than the
> calculated vector wind. Knowing if your GS is faster or slower than your TAS
> is the best info you can have to estimate your expected glide performance
> over terrain. But having to do the math mentally is silly. It doesn't matter
> if it is mathematically correct to call it component wind, the info is what
> matters.
>
> Ramy
>
> On May 9, 2012, at 3:35 AM, Evan Ludeman <tangoei...@gmail.com> wrote:
>
>> The OLC calculation is fine the way it is.
>>
>> The scalar "component wind" that Ramy is asking for is a really useful thing
>> to have in flight, never mind whether it's "correct". If my glider has to
>> make 80 kts TAS to achieve 60 kts GPS, that's useful info. Furthermore, if
>> the apparent HW component increases while on a straight final glide (no
>> updates to vector wind), that's *extremely* useful. It can also be used to
>> "sanity check" the current vector wind (I wrote a ticket about that,
>> somewhere).
>>
>> -Evan
>>
>> On 5/9/2012 2:12 AM, Ramy Yanetz wrote:
>>>
>>> XCSoar developers,
>>>
>>> The enhancement listed below (not all mine) are still in the wishlist
>>> bucket. I believe they should all be easy to implement and will be very
>>> valuable. Can I make an appeal to consider those for 6.4?
>>>
>>> #1561 OLC distance should be calculated from release to next waypoint
>>> #1974 Need instantaneous HW/TW calculation using TAS-GS when available
>>> #1603: Require zoom function independent for each map page
>>>
>>> Thanks,
>>>
>>> Ramy
>>>
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