View Full Version : How fast must a neptune climb to recognize a takeoff?
Yesterday I heard a story of a friend (expierenced skydiver) who did a ballon-jump wearing his neptune (FW 2.6.1).
He told me that his neptune did not recognize the takeoff (display did not activate) during the very slow (his words) climb to altitude. He did some balloonjumps before, so I believe him when he states that the balloon climbed very slowly.
The neptune is fine otherwise, I took it on a jump yesterday and all went normal, Battery is new.
How fast must the climb-rate be to get neptune on jump-mode, and would have manually activating "I am on a jump" solved the problem?
alex
Roger Allen
Apr 12, 07, 16:34
Yesterday I heard a story of a friend (expierenced skydiver) who did a ballon-jump wearing his neptune (FW 2.6.1).......... How fast must the climb-rate be to get neptune on jump-mode
alex
Sorry, there is no simple answer to this question. Recognition of a takeoff event is based on several factors including climb rate, and altitude (plus others). The factors are used to calculate a probability that a takeoff occurred.
...., and would have manually activating "I am on a jump" solved the problem?
alex
No.. this function is designed to prevent a unit resetting if, for example, so spend a long time flying straight and level at low altitudes. Once the unit sees a normal takeoff, then you use "I'm on a jump".
In the case of a balloon jump with an extremelyslow takoff and climbing to relatively low altitudes, you should use "Manual Mode". ---- Remember to cancel manual after the jump!
Hope this helps.
phoenixlpr
May 14, 07, 02:14
Sorry, there is no simple answer to this question. Recognition of a takeoff event is based on several factors including climb rate, and altitude (plus others). The factors are used to calculate a probability that a takeoff occurred.
No.. this function is designed to prevent a unit resetting if, for example, so spend a long time flying straight and level at low altitudes. Once the unit sees a normal takeoff, then you use "I'm on a jump".
In the case of a balloon jump with an extremelyslow takoff and climbing to relatively low altitudes, you should use "Manual Mode". ---- Remember to cancel manual after the jump!
Hope this helps.
My Neptun goes in flight mode in random manner, after 50-280m. I have tried to use "I'm on a jump", but nothing has happened.
My version is 2.6.2 D.
Roger Allen
May 14, 07, 07:37
My Neptun goes in flight mode in random manner, after 50-280m. I have tried to use "I'm on a jump", but nothing has happened.
My version is 2.6.2 D.
When Neptune is on the ground it samples altitude once every 60 seconds, it uses that inforation to track DZ pressure altitude, if nothing has changed it goes back to sleep to conserve the battery.
When you take off it could be a maximum of 60 seconds before Neptune wakes up, takes a presure reading and realizes that something is going on.
Regardless of when it wakes up it still know the correct DZ altitude.
Does this answer you question?
Roger
As a 180 to this conversation, what are the criteria for the neptune to recognise canopy vs freefall mode.I often hop'n pop from altitude (11 k) and often notice my neptune goes back into freefall mode when doing 270's etc. very annoying when trying to work out altitude lost in a turn! Could there be an adjustable "threshold" built into nmu, or it taken up to 78 mph? or a "stay in canopy mode" overide from one of the 3 buttons (once in canopy mode !)
hope this is not seen as a hijack
Regards
Jasper
Tim Henderson
Jun 7, 07, 09:54
As a 180 to this conversation, what are the criteria for the neptune to recognise canopy vs freefall mode.I often hop'n pop from altitude (11 k) and often notice my neptune goes back into freefall mode when doing 270's etc. very annoying when trying to work out altitude lost in a turn! Could there be an adjustable "threshold" built into nmu, or it taken up to 78 mph? or a "stay in canopy mode" overide from one of the 3 buttons (once in canopy mode !)
hope this is not seen as a hijack
Regards
Jasper
Jasper you say "often notice" - is it predictable? Does a certain 270 almost always bring it out of Canopy Mode?
Just my $0.02, but on my neptune I can get into fast spirals that burn up altitude aroun 200-300ft/sec and I've never had it go into freefall mode again.
I have, however, had to wait up to 10 seconds after jumping out of the plane for it to realize that I have jumped. It's a little frustrating because it's shortening my logged freefall time :)
Roger Allen
Jun 7, 07, 15:18
I have, however, had to wait up to 10 seconds after jumping out of the plane for it to realize that I have jumped. It's a little frustrating because it's shortening my logged freefall time :)
Hi Telek
The changing of modes in the air is not related to the exit point calculation.
We deliberately slow down the mode change from a/c to freefall until we have a high confidence that exit has occurred, this avoids annoying mode changes if the aircraft changes altitude on jump run.
However, the profile is logged from before exit occurred and that is used to calculate the exit point.
Roger
Ahh ok, that's what I thought, but I have a few jumps logged where I know that I was > 10k when I left the aircraft (looked at the alt just before I jumped) yet the jump altitude is recorded in the 9K range. Not a big deal, but occasionally annoying.
phoenixlpr
Jun 13, 07, 07:47
When Neptune is on the ground it samples altitude once every 60 seconds, it uses that inforation to track DZ pressure altitude, if nothing has changed it goes back to sleep to conserve the battery.
When you take off it could be a maximum of 60 seconds before Neptune wakes up, takes a presure reading and realizes that something is going on.
Regardless of when it wakes up it still know the correct DZ altitude.
Does this answer you question?
Roger
I had several times that our plane climbed over 300m and my Neptune was still in ground mode. I was riding a C172, I think. I have check altitude by pressing lower button and it indicated 0.3. I was still in ground mode after I switched back.
Jasper you say "often notice" - is it predictable? Does a certain 270 almost always bring it out of Canopy Mode?
Hi Roger
"Yes"! I would say 50% of the time - so much so that I now don't do any rotations much under 3k(1000ft altitude loss in a turn) for fear of the neptune not coming out of ff mode in time(1500 ft setup)! My decent rate (full flight)is in the mid 20's mph tas as per paralog & I do get up into the late 70's in a turn
Cheers
Jasper
Roger Allen
Jun 20, 07, 16:47
I had several times that our plane climbed over 300m and my Neptune was still in ground mode. I was riding a C172, I think. I have check altitude by pressing lower button and it indicated 0.3. I was still in ground mode after I switched back.
This is exactly what we would expect. Neptune has recognised that a takeoff MAY have occurred and has locked the DZ altitude, but does not change to climb screen until it has a higher confidence the a takeoff DID occur.
Roger
Roger Allen
Jun 20, 07, 16:56
Hi Roger
"Yes"! I would say 50% of the time - so much so that I now don't do any rotations much under 3k(1000ft altitude loss in a turn) for fear of the neptune not coming out of ff mode in time(1500 ft setup)! My decent rate (full flight)is in the mid 20's mph tas as per paralog & I do get up into the late 70's in a turn
Cheers
Jasper
Jasper
Sorry for the delay in responding - just to confrm, you do have a canopy alarm activated, corrrect?
Roger
Jasper
Sorry for the delay in responding - just to confrm, you do have a canopy alarm activated, corrrect?
Roger
Roger - No I don't! - I wear a Wave in my helmet & my Neptune on my Leg ,with all alarms disabled, but "Canopy Mode" enabled...
Jasper
Roger Allen
Jun 25, 07, 13:10
Roger - No I don't! - I wear a Wave in my helmet & my Neptune on my Leg ,with all alarms disabled, but "Canopy Mode" enabled...
Jasper
Ah - well that explains it. Canopy alarms (aka swoop mode) being activated prevents Neptune from going back into freefall mode (at any speed) once it is in canopy mode.
Just activate a canopy alarm - problem solved.
Roger
Thanks Roger! will try that this week-end!-I obviously turned the alarm off for battery saving reasons! will let you know:)
Jasper
phoenixlpr
Sep 24, 07, 03:02
V3.0 software goes to climbing mode after 20-30m. Well done!
Hi Roger- me again! upgraded to 3.0, and now have the same problem under canopy - with alarms enabled or disabled my nept 2 sometimes goes back into ff mode...is there a fix for this?
Thanks
Jasper
Roger Allen
Sep 25, 07, 09:37
Hi Roger- me again! upgraded to 3.0, and now have the same problem under canopy - with alarms enabled or disabled my nept 2 sometimes goes back into ff mode...is there a fix for this?
Thanks
Jasper
Hi Jasper
Yes, this is a bug, we are working on an incremental release to fix this issue, it will be released to AFS this week and will be generally available early next week.
Roger
Hi Jasper
Yes, this is a bug, we are working on an incremental release to fix this issue, it will be released to AFS this week and will be generally available early next week.
Roger
Thanks Roger...let us know when
Jasper
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