Re: [CNO] How to repair a hole in PC mesh
That is not (generally) a very dimensionally stable region of a pilot chute anyway. I cannot tell for sure from looking at the picture if the repair made would alter the trim of the pilot chute further outside the range that would be acceptable for a new one.
Also, I don't think the added weight of the thread used in the repair would contribute to a measurable change in performance that could be directly attributed to the repair.
Some manufacturers use a surger to finish the junction between the top skin and mesh of pilot chutes. In this case, the overlap of the surger stitching places more thread on one side of the pilot chute than the region directly across from it. The amount of thread I'm talking about is far more than what is shown in the picture of the repaired mesh. There are no steps taken to offset this tiny bit of added mass because....well... it doesn't matter. Unnecessary.
All that being said, I would not jump the pilot chute in the photo because I would have other concerns.
One would be the question of how the mesh was stabilized (or not stabilized) before it was knotted closed. A hot knife could leave small sharp, hard ridges that could interact with the rest of the mesh in an unpredictable way.
Another would be an uncertainty in knowing the current status of the repair at any given time. Each jump puts wear on a pilot chute. If the repair were to fail, that little repaired tear could become a large hole on your pilot chute during a BASE jump, which is not a suitable environment for a pilot chute to malfunction.
Which leads me to my next concern. I forgot who said it, but someone once told me, "your pilot chute is the first thing that has to work correctly in order for you to live." You get one shot at your pilot chute working correctly on a BASE jump then you need to get really creative, really fast to get your canopy to linestretch. A new vented pilot chute is less than $100 (toxic PC's excepted) so the potential risk from using this pilot chute, in my opinion, far outweighs the cost-benefit of keeping it in service.