• PiperForum.com is a vibrant community of Piper owners and pilots. Our over 1,500+ active members use Piper Forum to swap technical knowledge, plan meetups and sell planes/parts. We host technical knowledge of general aviation topics and specific topics on J3-Cubs, Cherokees, Comanches, Pacers and more. In addition to an instant community of pilots for you, PiperForum.com is a library of technical topics, airplane builds, images, technical manuals, technical documents and more.

    Access to PiperForum.com is subscription based. Subscriptions are only $49.99/year or $6.99/month to gain access to this great community and unmatched library of Piper knowledge.

    Click Here to Become a Subscribing Member and Access PiperForum.com in Full!

DA with Altitude


Well-Known Member
Apr 8, 2010
Reaction score
I was wondering if there is some sort of standard that you can figure out the DA your flying in given the altitude your at if you know what the DA is on the ground. I guess I could get my books out and cook something up with adiabatic lapse rates and DA formulas or something. but is there a rule of thumb? I wanted to go direct out of KCTB to 32S but the DA on the ground was over 6K and I didn't figure I'd be going much over 9,500' and I was hearing PIREPS of strong mountain waves and that was cutting it a little close for me.. Next thing I know I'm at 12,500 (Couple of up drafts didn't hurt, but we stayed there and I was able to get it back after some down drafts) after filling up with 2 on board and 50lbs of gear so I hit the D-> and away we went. there was about a 2600' difference in DA vs Elevation at the airport so if it was linear that would have put me at 15,100' DA but It can't be linear. I suppose its possible to be flying at a lower DA than take off in some situations.

Latest posts