Here are some additional details about the impact of
BASE 23 and the mulch truck.
There was no damage to the truck. All three pods were
foam core construction (either two inch or one inch
thick) with the payload region cut out from the middle
of each piece leaving a solid perimeter. The pieces
were bonded by 2 hour epoxy. Total payload mass was
2.5 kg (weight of 5.5 lbs) the two radio pods were
each 0.75 kg and the experiment pod was 1.0 kg.
Impact was on the broad side of the APRS radio pod
where the weight density is 1/8th of an ounce per
square inch (the narrow side is 3/4 of an ounce per
The parachute was a 6 foot Spherachute and the
vertical descent speed was 15 +/- 2 mph below 30,000
feet. Surface winds at the moment of impact were
almost identical from the southwest.
Staying significantly below the safety guidelines
(weight density less than 3 ounces per square inch on
the smallest cross sectional side) made the collision
The bigger issue is driver distraction, which was not
a problem in this case. However, the traffic density
on US 52 at that time of morning was no more than one
vehicle per minute in either direction on the two lane
road. The light traffic explains why no one else
witnessed the impact.
--- "K. Mark Caviezel" <kmcaviezel@...
> Any damage to the truck?
> Total Payload weight?
> - Mark ng0x
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