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Thanks Neil, It is starting to "make sense".

so I ran 2 simulations with motor having a 7 vs 14 second delay (no other changes). Max Velocity and Max Acceleration are the same (as expected). Time to apogee increased by 0.5 seconds (?).

I set the motor delay to close to the optimum delay so as to get a low velocity at deployment. I will try using a 14 second delay tomorrow. Thanks to all of you. Jay

About 1.6 sec burn

video not available but it showed ignition at 14 sec and apogee at 28. thanks to all who scratched their head and got me closer in my understanding

I modified delay from 14 to 8 seconds in theory. Video may be too big to load. I will try posting a link. Something doesn't add up.... Video near apogee/ejection is tough to make out....gonna get a JL ALT3.

I chose smooth on all surface components giving a small change from regular.

I chose "Regular paint"......not sure how to rate spray paint

I looked more closely at my model and I had square fin edges but in fact were rounded. simulation bumped up altitude by over 300' and time to apogee from 8.9 to 9.7

painted/sanded

I ran 6 variations of the simulation and forced/over road the weight from 20 - 60 oz where actual weight is 36 oz. As weight increases altitude goes down and max accel goes down....makes sense but the time to apogee stays roughly unchanged (about 8 seconds). Perhaps that is just the way it...

I retract part of my post that a 2 lb change did not produce a sizeable change as being expected.

I launched my L1 rocket on an Aerotech reloadable H130W-14 I did not have any electronics except for JLCR for the main at 300'. I created a model in OR and it predicted a time to apogee/delay of 7 seconds. Video shows it reaching apogee at about 14 seconds. Good thing my delay adjustment was...

I somehow thought one needed to use electronics for deployment at apogee and actually needed dual deployment for L2

I read the NAR definition of Active Recovery as it relates to L2 certification. Does an altimeter to pop a drogue at apogee and then my main using a JLCR satisfy NAR and is it a reasonable approach? Thanks, Jay

Pathfinder flies straight as an arrow upscaled to 29mm

Amazing...…. “That pin wasn’t through the loop,” he said. Close-out crews missed spotting the problem because the lines and their connections were tucked away within protective covers. But a review of photos taken during the close-out process, as well as an inspection of the hardware recovered...

good point about weak link. So no "stretch" on Kevlar at all?

I have no experience at DD but I think your approach has value.

I was OCD about weakening the component by cutting that large hole in it. In my case this is a coupler between lower and upper BT where it separates. My SC is 4 feet long 1/4" elastic cord so I'd think the "twang" would be low from the ejection charge. I appreciate all of your experiences. Jay