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davesalmon
Pterodattilo
United Kingdom
1620 Posts |
 Posted - 26/07/2015 : 20:41:42
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Yesterday I was on a local 100km triangle. I have Equ Mc on LK8000, and intended to set 2 kts on the SN10, but finished up with 1.9kts, so left it at that, the knob is a bit of a stretch in the Discus. Mostly cruising between 70 and 80 kts to keep the Ilec needle where it should be, but Equ Mc was always much lower, I don't think I ever saw it above 1.4/1.5, and usually around 1.0. I have exactly the same polar co-ordinates in both, and which are both for 38kg/sq m.
The SN10 of course has airspeed, LK8000 doesn't, could this account for the difference? |
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Coolwind
Moderator
Italy
8957 Posts |
Posted - 26/07/2015 : 23:44:49
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Yes of course. Equ mc depends on ias.
Did you notice wind speed in lk? |
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davesalmon
Pterodattilo
United Kingdom
1620 Posts |
Posted - 27/07/2015 : 08:07:56
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| Wind speed in LK is taken from the SN10, so they are both the same. It was usually around 11/12 kts. Great pity the SN10 does not output airspeed. |
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Coolwind
Moderator
Italy
8957 Posts |
Posted - 27/07/2015 : 13:31:33
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| Probably wing load was wrong in lk. Too high. |
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davesalmon
Pterodattilo
United Kingdom
1620 Posts |
Posted - 27/07/2015 : 16:28:35
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| No, same in both, it's high because it's a bT. I fly it at just over 400kg auw. |
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Marco from Hangar 5
Pterodattilo
Netherlands
886 Posts |
Posted - 27/07/2015 : 17:10:00
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| Could it be a units conversion error? (knots versus Km or wingload Kg/sq m versus Lbs/Sq Ft??) either internal the SN10 or LK8000, just thinking.. been there, done that.. |
Marco
BU (PH-588)
Mini Nimbus HS7, s/n 039
http://www.zweef.nl/
Zweefvliegcentrum Noordkop, NETHERLANDS |
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davesalmon
Pterodattilo
United Kingdom
1620 Posts |
Posted - 27/07/2015 : 19:01:49
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| Worth checking the SN10 next time Marco, though 99.9% certain it is correct, as is LK8000. |
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MacCready