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Hybrid ModificationsThe Double L was a popular modification in the 1950's and 1960's. It gave a forward speed of 8-10 mph and was stable in turns.
Double L Modification
The T-L Modification combined the T and Double L modifications. The large area of cutouts made for a very rapid descent. This canopy was not reccommended for beginners.
The TU Modification became very popular because it had a slow descent rate, forward speed of 10-12 mph and was stable in turns. The descent rate was 21 fps with a 200-lbs load. Full 360o turns could be done in 5 seconds. This parachute modification was used by the 1960 US Team.
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