Random erroneously slow descent rate of LUU-2B

[Stickler]

For reasons I have not been able to reproduce, LUU-2B paraflares when released from the F-4E sometimes descend at a rate of around 540 ft/min, at other times at a rate of around 30 ft/min.

The correct RL descent rate is 8.3 ft/s or 500 ft/min (luu_2c-b.pdf (alliantaction.org)).

I have not tried other aircraft.

Please find attached a track, an .acmi recording of the actual flight, and an .acmi recording of the track.

Note the descent rates as follows:

1. 30 ft/min
2. 540 ft/min
3. 540 ft/min
4. 30 ft/min
5. 540 ft/min
6. 30 ft/min in the live flight, but 540 ft/min in the track, so there seem to be two layers of randomness at play.

 

LUU-2B.trk LUU-2B (live).acmi LUU-2B (track).acmi

[Zabuzard]

Perhaps they have the chute open in one and closed the other time?

Thanks, we will forward it to ED. Cheers

[Stickler]

The chute opened in all cases.