0
skydivebb

N3. Density altitude vs. Pressure altitude (QNE)

Recommended Posts

Has anyone found a usage for the QNE info on the N3? I have been reading on relationships between the different readings and wonder if it is something that is more/less valuable than density altitude or should be used in conjunction with. Is there a relationship between the two that is useful for hp landings? The mechanics of swooping post was very informative and hopefully this one will be too. Any info to clarify this would be appreciated.
Facebook.com/SeamlessRigging

Share this post


Link to post
Share on other sites
It is really quite different to density altitude.

QNE relates to pressure altitude. I am guessing that the setting on the N3 is to allow you to enter the local pressure which can be obtained from AWOS. QNE is how it referred to outside of the US and it is in millbars(mbar). In the US it is measured in inches of mercury (inHg). I don't know which the N3 expects but it probably changes if you flip between metric and imperial.

Density Altitude takes Pressure Altitude and adjusts for temperature and humidity. It isn't an altitude you are at but a "performance" altitude. It does indeed make a difference to canopy and wingsuit performance so you are onto a valid direction there.
Summer Rental special, 5 weeks for the price of 4! That is $160 a month.

Try before You Buy with Wicked Wingsuits - WingsuitRental.com

Share this post


Link to post
Share on other sites

I should add, if you have access to AWOS it will probably tell you the density altitude without having to get a calculator out, at least it does at most airports where it starts to make a big difference! ;)

Summer Rental special, 5 weeks for the price of 4! That is $160 a month.

Try before You Buy with Wicked Wingsuits - WingsuitRental.com

Share this post


Link to post
Share on other sites
Thanks for your response. I haven't looked into if its programmable but that's something to look at. I have always based my flights off of density altitude but recently started using GPS and found that the data makes a huge difference. If anyone finds a use for the Pressure Altitude numbers I'd be interested to hear it.
Facebook.com/SeamlessRigging

Share this post


Link to post
Share on other sites
skydivebb

Thanks for your response. I haven't looked into if its programmable but that's something to look at. I have always based my flights off of density altitude but recently started using GPS and found that the data makes a huge difference. If anyone finds a use for the Pressure Altitude numbers I'd be interested to hear it.



In Wingsuit comps we have found pressure altitude on audibles to be unreliable by 100's of feet, but that is at 10000ft where temp difference play a role also. In most scenarios it's not an error that creates a safety issue but it just impact scoring.

As you compare GPS data to N3 data you might see the same.
Summer Rental special, 5 weeks for the price of 4! That is $160 a month.

Try before You Buy with Wicked Wingsuits - WingsuitRental.com

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

0