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[Question] PLH vs Wing Height

seedlings

* Ace Member *
Joined
Aug 29, 2020
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Northwest Missouri
The parting line is where the top and wing mold meet, sometimes a sharp edge needing trimming after the mold is released. I was comparing the Rainmaker left with a P2 right and thought the PLH was just about identical. We'll it isn't. The P2's seam is noticeably higher than the Rainmaker. What I meant was the edge of the wing was at nearly identical height, but the other guy said no. Parting Line Height is only about the seam.

TLDR: Well? Is the important factor the tip edge of the wing height OR parting line height p, which may or may not be the tip of the wing edge?

Some molds (Destroyer) the parting line is just above the bottom edge of the wing. Other molds (Ballista Pro) are manufactured differently and the parting line IS the bottom edge of the wing.

Same guy explained that's what many Trilogy molds beat in faster, because the PLH is lower, even if the edge of the wing is not lower.

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The PLH comparison is meant to be used when comparing discs within the same mold. The comparison breaks down a bit when looking at two different molds, because there's a lot more variables than just PLH.

That being said, if you're looking at nearly identical molds, then comparing the wing height would be the more important characteristic. Think of it this way: what has a bigger impact on an airplane's aerodynamics -- the wing shape or where the rivets are located?
 
I agree, wing height is the correct answer.

The parting line itself shouldn't have any impact on the flight. Gotta keep in mind, the faster the disc, the more drastic the difference in stability due to slight molding differences. So a very high majority of the time we're talking about discs with a very sharp nose, where the parting line occurs at the very tip of the disc nose. Comparing PLH became a thing because it was an easy visual, but in reality you're comparing where the underside of the wing sits compared to another disc of the same mold.
 
Putter flight is more dependent on bluntness (or how quickly the mold transitions from leading edge to the bottom of the rim/top flight plate. So overall height and rim configuration make a bigger difference.

As wing width increases, the PLH/wing height matters more because it dictates the ratio of top mold to bottom mold for the leading edge of the disc. Top mold profile matters for high speed/nose down portions of flights. Bottom mold profile matters for low speed/nose up portions of flights. Bluntness dictates the transition between those portions of the flight (blunt = quicker deceleration & fade, sharp = slower deceleration & forward fade).
 

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