Brian


I have looked at your IGC file.
The issue for me is: what is the fully scale ENL level?

If it is 195, then you have a problem with the logger.
If it is 400 or 1000, then the logger may be recording entirely normally.
The higher ENL values also occur in both the circuits, suggesting that they
represent "wheel-down".
The highest glide of 100 knots only gives a reading of 40.

I would have expected to see a higher value at touchdown. I see no evidence
of a touchdown spike. Maybe you grease the glider onto a smooth runway! I
would also have expected a higher value at 100 knots.

I would recommend the following tests:
Put the logger into the tug plane and seem what ENL level is recorded -
expect over 800, if 195 then problems.
Try putting the logger somewhere else in the glider, such as the luggage
shelf, which should be more noise-sensitive than the top of the instrument
panel.

If you have neither Turbo nor SLMG then the ENL is not vital.

------------------------------------------------

I fly a DG800 SLMG with LX20 logger.
The ENL recording is between 0-1000.
I tend to review my flights using SeeYou with Map, Altitude and ENL windows.
This allows ENL noise to be reviewed and interpreted.

My values a
Engine running - never less than 800, normally about 900.
There is sometimes an after effect following the engine run and this seems
to take some minutes to return to normal levels, but not of the same order
as your noise levels. The engine noise also dips to 800 at the start of the
takeoff roll! I have not studied the post-engine run noise because it is
normally not very noticeable.

Touchdown spike 800
Winch launches 500-600.
Spins 600-800.
Engine up 500-700.
Normal flying 0-400.
High speed glides - 80kts 400, 90kts 550, 100kts 600, 120kts 800.
I can find a record of 600 at only 80kts.
I cannot tell from the ENL if the wheel is down, but it is colder and sounds
noisier in the cockpit. I have checked at least one "wheel down" flight.



Rory