Protrack newbie question

[Andybilly 0]

I used my Protrack for the first time over the weekend. On the first jump I pulled at 4K and the Protrack indicated 3120ft. On the second jump I pulled at 3.5K and it registered as being 2706ft. Is the loss of 880ft and 794ft the time it takes for the canopy to fully deploy? and if this is the case, will it make the freefall time inaccurate?

[phoenixlpr 0]

Quote

will it make the freefall time inaccurate?

Before Pro-track it was just guessing :).

[mr2mk1g 10]

In freefall you are doing roughly 176 ft/second so very roughly you're looking at between 4 and 5 seconds (at freefall speeds) to account for the difference between your appreciation of deployment altitude and the pro-tracks appreciation of deployment altitude.

How much of that time do you think was spent looking at your alti, registering the altitude you were at, deciding to pull, reaching back, grabbing the hackey, pulling and throwing, feeling the container open, having the d-bag move to line stretch?

All of that is done at roughly terminal velocity, thus if it a took only 3 seconds you've already covered more than 500ft. during that sequence of events before you even start to slow down. That leaves you with 300ft. How long is your snivel? Can you tell the difference between 4100ft and 3800 ft on your alti during freefall? Where do you mount your pro-track?

That's part of the answer. For more of the answer others could look at how burbles affect altitude readings or even consider which event the pro-track uses as its trigger for determining deployment altitude.

[Andybilly 0]

Thanks mr2mk1g, it all makes sense.

[freeflysteve 0]

mr2 etc got it all about right
protrack has 3 settings get outta here(break off)pull(your setting)and oh shit(you were too late!)
basically takes 4 to 5 seconds for average deployment and pro track records until you are sub terminal somewhere between deployment and fully open canopy,roughly half way.
you will notice on some jumps like hop and pop all small delays (under 10 seconds)it wont record a jump.
whats really cool if you are in say a porter and come down with the plane cos say jump limit changed or some other nice and not dangerous reason if the pilot puts plane in a dive it will show exit altitude and when pilot levels out it will show deployment altitude
anyways bro have fun skydiving
blue skies

Swooping, huh? I love that stuff ... all the flashing lights and wailing sirens ... it's very exciting!