https://www.youtube.com/watch?v=7jdFHuetXJg
This video in particular is crazy, and despite the amount of hop up chamber/nub/sleeve combinations I've tried over the years I've never even approached this.
I have an rhop z kit enroute and will be attempting the install. I have a 220' indoor range and will be attempting to document my ballistics as best possible to see if I can replicate the results.
Additionally, here is another interesting read:
http://mackila.com/airsoft/atp/04-a-01.htm . Further just adds to the apparent magical abilities of rhop.
*Edit - As a side note, one of the major holes I feel in the ATP is this fact:
Quote:
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Originally Posted by atp
Hop-up as modeled throughout these pages should not be taken as gospel -- they're very close but not perfect. One thing that was not taken into account in modeling hop-up is the diminished muzzle velocity due the energy loss from the pellet striking the hop-up rubber. This was initially going to be part of the model, however I could not determine direct correlation between spin and energy loss, particularly so considering that different rubbers seemed to have different effects with no uniform consistency. At any rate, while energy dissipation, velocity loss, and other things have been tested and verified, the hop-up model is theoretical and should be used as a guide to understand the relationship between velocity, mass, and spin; trying to use the hop-up model plots to estimate how much you should aim above a target at 200 feet is beyond the current limits of the model and should only be used with a grain of salt.
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It seems that the relationship between force placed on the hop-up by the standard style arm/nub unit vs the constant friction provided by r-hop may lie the secret to it's success.