Best Pro-Track Location

[Hooknswoop 19]

Where is the best place to wear a Pro-Track for wing suit flying to get the most accurate results?

Hook

[bps 0]

Thanks for asking the question Hook -- I was getting ready to ask the same question...

Anyone have any thoughts?

Bryan

[kevin922 0]

And while we are talking about protracks, I can't remember if we raised the question or not - SAS or TAS?

[LouDiamond 1]

I could of swore they addressed the SAS /TAS issue in the owners manual...now I'll have to go look since it will bother me until I do.

OK, besides explaining what they each mean the book seemed fairly vague. However, it states that the protrack actually gathers both. The SAS formula calculates using the TAS information. I think this is probably more eveident if one uses the software and does a comparrison of the two readouts. Based on the explanation, it seems that SAS would be the best choice since it will give you a consistent readout regardless of altitude fluctuations. That is of course assuming you want your airspeed while in flight

"It's just skydiving..additional drama is not required"
Some people dream about flying, I live my dream
SKYMONKEY PUBLISHING

[pattersd 0]

Don't know about where the best place is, but my limited experience showed that wearing it in my helmet gave big fluctuations. I had my rigger sew a small pocket onto the front of the lower leg and that position is giving me smooth speed tracks when I download the information.

[quade 4]

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Based on the explanation, it seems that SAS would be the best choice since it will give you a consistent readout regardless of altitude fluctuations.

Speed records; FAI aircraft & speed skydiving, are always TAS.

quade -
The World's Most Boring Skydiver

[SkymonkeyONE 4]

Derek,
are you and your old lady the two folks in Colorado who got the two demo suits from Kim? If so, are you able to keep them all the way through the Eloy gig?

As far as PROtrac on a wingsuit goes, I believe Craig Poxon or Yuri are the only technophiles who put them anyplace other than right on their helmet. I am probably wrong, but then again I don't wear one, so I don't pay too much attention. I can say that Bobby Pritchard gets very accurate readings with his on his Mindwarp. When he jumps without a helmet, he sticks it in the hook knife pocket on the front of the right leg of the suit.

Chuck

[LouDiamond 1]

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Based on the explanation, it seems that SAS would be the best choice since it will give you a consistent readout regardless of altitude fluctuations.

Speed records; FAI aircraft & speed skydiving, are always TAS.

You are correct, I found this info on the subject
http://www.speedskydiving.net/info/faq.php

"It's just skydiving..additional drama is not required"
Some people dream about flying, I live my dream
SKYMONKEY PUBLISHING

[bps 0]

For comparison differences, here's the difference between TAS and SAS:

TAS True Air Speed -- measures your actual airspeed.

SAS Skydiver Air Speed -- takes into account the pressure difference of the altitude that you are jumping at and then calculates what your airspeed would be at Sea Level.

I realize most people know this, but for those that don't, you travel at a much faster speed when you are at the higher elevations.

A good example: I jump in Colorado and the field elevation at one of the drop zones where I jump is 6,500ft. Our jump runs are at 11,000ft above the ground -- which in effect -- is 17,500ft above sea level. Just the other day, I checked my Pro-Track after a 4-way training jump. My TAS average was 138mph. When converted to the SAS average, it was 124mph. So this is saying that at sea level, my average fall rate would be measured at 124mph. They designed this so skydivers around the world could compare data on the same playing field -- and it doesn't sound like a bad idea to me.

Another neat little trick is that you can toggle between TAS and SAS after the jump..so you can get both readings after the fact.

Blue Skies,

Bryan

[Spy38W 0]

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SAS Skydiver Air Speed -- takes into account the pressure difference of the altitude that you are jumping at and then calculates what your airspeed would be at Sea Level.

Not to nitpick, but it references speeds to what they would be when you terminate your skydive (deploy) at a sea level dropzone (4000' MSL) Based on standard temperature and pressure.

--
Hook high, flare on time