Parks College Parachute Research Group
Projects of Special Interest to Skydivers
Research Projects, Devices Built, and Technical Information
This section presents some of the Group's research in a slightly less technical way,
and highlights our research projects which are of special interest to skydivers.
Also included are some devices, systems, and computer programs we have designed and built.
One test is worth a thousand opinions
- Skydiving Canopy Opening G-Forces,
a short article that attempts to consolidate the data we have collected on
parachute opening forces into "typical" values.
- Fall Speed Under a Baglock, a simple calculation,
a way to estimate how fast you might fall under a baglock, based on your equipment and body sizes and weights.
- Slider Drag Cancellation: Another Cause of Hard Parachute Openings,
a mechanism which, either on its own or in conjunction with other mechanisms, may lead to very hard openings.
- The "Swoop Streamer"
Learning canopy maneuvers with a visual reference at safe altitudes.
- Skydiving Fall Rate - Investigating skydiving freefall
speeds using a barograph
This report, which includes summary of jump data from over 50 jumps
of many types, a graph of freefall speed from an entire formation skydive,
and a Freefall Speeds Chart, is a comprehensive study of skydiving fall
rates whose origins began in 1990. It introduces an important term to be used
when comparing skydiving freefall speeds - Sea Level Air Speed (SLAS).
- Riser loads during canopy maneuvers
Graphs of risers loads while performing a series of
canopy maneuvers with a Performance Designs Stiletto 150.
- Riser loads during shoulder-down deployments of
This short study, which includes graphs of riser loads of shoulder-down
deployments of a Performance Designs Stiletto 150, was undertaken to try to
understand why a canopy that normally opens in a slow controlled manner should
open very quickly when the shoulders are not level.
- Airtec GmbH Cypres AAD Power Consumption
Tests done to determine the power consumption of a Cypres during different
- Researching Hard Opening Ram-Air Parachutes
This research is a result of personal experiences with canopies that opened
unacceptably hard, and some of the solutions found.
- Ram-air parachute packing methods
This article is a brief summary and background on several packing methods,
including pictures. What is "flat packing" or "side packing"? Which
method do I want to use to pack my parachute? Common packing myths.
- Using a flexible cable closing pin on an experienced skydiver's rig
This study was done to determine if a flexible cable closing pin is a
practical method of closing the containers of rigs for experienced skydivers,
and included an experiment on closing loop wear.
- Methods for stowing excess steering line on your risers
Simple designs for when your risers do not have a stowage method or if the method is not convenient.
- Camcorder remote record indicator light
This circuit was developed for our own use and is presented here because
we have seen so many skydivers not knowledgable in electronics having
trouble while attempting to build this kind of circuit.
- Tongue Switch for Canon EOS Digital SLR
This circuit was developed for our own use and is presented here to help
skydivers not knowledgable in electronics to identify the parts necessary
to build a tongueswitch.
US Winds Aloft Forecast for Drop Zones
This program uses National Weather Service data to represents wind direction graphically.
Translated US METARs for Drop Zones
This program provides easy to use pulldown menus to request plain language METARs from the National Weather Service.
US FAA 180 Day Parachute Repack Cycle Calculator
This program can 1. calculate how long the parachute will be in date from
the date it was packed, or 2. calculate when the parachute must have been
packed to be valid through a certain date.
- Conversion factors
Some common conversion factors related to skydiving (because it is so
easy to forget where we put them.)