calculating freefall speed

[mlackner 0]

How do you calculate freefall MPH speeds?

both belly RW and Freefly etc?

[labrys 0]

Divide the distance you fall in miles by the time it takes in hours.

Most folks use an audible altimeter with a feature that keeps track of it for them.

Owned by Remi #?

[pilotdave 0]

You don't happen to know your coefficient of drag in various body positions off the top of your head, do you?

Dave

[labrys 0]

Don't forget that "coefficient of drag" also changes depending upon how much fun you are having and how colorful your jumpsuit is.

Owned by Remi #?

[Witelli 0]

Get a protrac.

[mlackner 0]

are there GPS type devices?

backcountry skiiers and paragliders use them. Do skydivers?

[Dumpster 0]

Wingsuit flyers seem to like GPS devices. Most all other use a Pro-Track or Skytronics freefall computer/audible altimeter.

Easy Does It

[labrys 0]

Quote

are there GPS type devices?

I've heard people talk about using a GPS in the air, but usually they're looking at them under canopy not in freefall.

The devices I mentioned earlier are more appropriate for calculating freefall speed. Two common audibles that record freefall speed are the Neptune and Pro-Track

Owned by Remi #?

[mlackner 0]

How does it work? {freefall speed determination}

[pilotdave 0]

They calculate speed based on the change in air pressure as you descend.

Dave

[labrys 0]

http://www.l-and-b.dk/protrack.html

Here's a link to the Pro-Track info...

It's pretty basic.. it's an electronic altimeter with a simple set of programs that calculate intersesting details about a jump, including the number of feet descended and the time it took to descend. It starts measuring freefall speed at exit and stops at deployment.

Owned by Remi #?