DexterBase 0 #1 March 15, 2010 Did a couple jumps this weekend. Both were solo wingsuit jumps with a Skyflyer and Sabre 120. Fall rates in mid 50's to 60's. Normal deployments, no crazy hard openings or line-twists. Protrack mounted on Oxygen helmet clip, set to SLO. Neptune hand mounted on left hand. On climb, Protrack did its thing at 1000 feet and agreed with other altimeters. POST JUMP On all jumps, exit altitude reads pretty darn near the same. Speeds recorded on both were pretty close as well. BUT, the deployment altitudes listed vary a lot. Jump #1 Protrack shows deployment 2200 feet higher than actual. Jump #2 Protrack shows deployment 2300 feet higher than actual. I like having an audible but if it thinks I'm 2000+ feet higher than I am, its pretty useless. I am comparing these altitudes against a mudflap mounted Galaxy. The Neptune and Galaxy tend to agree, but the Protrack is on its own program. Could it just be the combination of helmet mounted and wingsuit that's tricking the protrack? Maybe I should swap them and see what happens. Any ideas? Quote Share this post Link to post Share on other sites
airtwardo 6 #2 March 15, 2010 Switch 'em out and see what happens, I'd of bet the it was the Neptune that was off...but obviously 2000' feet is MAJOR! ~ If you choke a Smurf, what color does it turn? ~ Quote Share this post Link to post Share on other sites
JohnRich 4 #3 March 15, 2010 QuoteFall rates in mid 50's to 60's. What does that mean? Quote Share this post Link to post Share on other sites
DexterBase 0 #4 March 15, 2010 Average vertical speed was between 55 mph and 63 mph Quote Share this post Link to post Share on other sites
popsjumper 2 #5 March 15, 2010 QuoteSwitch 'em out and see what happens, I'd of bet the it was the Neptune that was off...but obviously 2000' feet is MAJOR! Learn me something. Why would you bet the Neptune would be off? Hand-mounted? Or what?My reality and yours are quite different. I think we're all Bozos on this bus. Falcon5232, SCS8170, SCSA353, POPS9398, DS239 Quote Share this post Link to post Share on other sites
jakee 1,254 #6 March 15, 2010 QuoteQuoteFall rates in mid 50's to 60's. What does that mean? The Fall (or autumn) that we had this year was rated (marked) as being slightly above average weather wise, with most independent observers scoring it in the range of 55 to 65 out of 100 (depending on whether they took foliage colouration into account). To Dexter: What about the audible alarms? Were they coming at the right altitude?Do you want to have an ideagasm? Quote Share this post Link to post Share on other sites
pchapman 261 #7 March 15, 2010 Quote Jump #1 Protrack shows deployment 2200 feet higher than actual. Jump #2 Protrack shows deployment 2300 feet higher than actual. This might be blindingly obvious, but they didn't show 119 seconds of freefall by any chance? Sounds about right for even a basic wingsuit flight at a turbine dz. That's an old limitation of the Protrack for wingsuits. I think that when it hits 119, it also considers freefall to be over. Quote Share this post Link to post Share on other sites
DexterBase 0 #8 March 15, 2010 The protrack reads 119 on almost all of my jumps now. (maxed out) where the Neptune reads around 160 seconds. All of the freefall alarms seem to be right in the ballpark. Stumped. Could it be that the Protrack records the deployment altitude at the time it hits 119 seconds???Edit to add: According to the Neptune today's jump was: Exit: 17750 Depl: 3100 FF Time: 157 seconds AVG: 62 MPH According to the Protrack: Exit: 17900 Depl: 6600 FF Time: 119 (maxed out) AVG: 59 MPH Mudflap mounted altimaster III agreed with the 3100 foot deployment. Maybe its time to email L&B... Quote Share this post Link to post Share on other sites
pchapman 261 #9 March 15, 2010 Quote Stumped. Could it be that the Protrack records the deployment altitude at the time it hits 119 seconds??? I think that's what it is. That's just all the jump memory it has, having been designed when wingsuits were rare. Quote Share this post Link to post Share on other sites
phoenixlpr 0 #10 March 15, 2010 QuoteMaybe its time to email L&B... How about RTFM? Protrack does not record beyond 119 sec whatever you do. Quote Share this post Link to post Share on other sites
DexterBase 0 #11 March 15, 2010 If the unit can tell what altitude you are at when you deploy, why not record that figure instead of what altitude you were at when the clock ran out? Quote Share this post Link to post Share on other sites
kallend 1,618 #12 March 15, 2010 QuoteIf the unit can tell what altitude you are at when you deploy, why not record that figure instead of what altitude you were at when the clock ran out? Because the design assumption was that NO-ONE could possibly still be in freefall 2 minutes after exit. The Alti-Track, also from L&B, fixed the problem.... The only sure way to survive a canopy collision is not to have one. Quote Share this post Link to post Share on other sites
DexterBase 0 #13 March 15, 2010 Quote Because the design assumption was that NO-ONE could possibly still be in freefall 2 minutes after exit. Wow... I didn't think my protrack was that outdated... now I feel old... Quote Share this post Link to post Share on other sites
