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The Street => The Bike Shop => Topic started by: ediotism on August 05, 2019, 06:57:52 AM

Title: another new freecoaster - planetary gear engagement
Post by: ediotism on August 05, 2019, 06:57:52 AM
https://bmxunion.com/daily/inside-look-at-the-free-night-planetary-freecoaster-hub/

what does everyone think? pretty interesting concept although there're a few things im skeptical about

1. male axle in 2019?
2. if you pedal forward when in fakie, the internals can explode


anyway, super happy of some new innovation coming to market
Title: Re: another new freecoaster - planetary gear engagement
Post by: JFax on August 08, 2019, 06:10:10 AM
Could probably make it female in a similar way the z-coaster works.

Got myself a Salt coaster a while back and it kinda broke. Just got myself a z-coaster and it might just be me but I am not impressed how it works, spins really badly. Gonna put it on the test.

Title: Re: another new freecoaster - planetary gear engagement
Post by: Professor Horatio Hufnagel on August 08, 2019, 08:13:56 AM
A no-slack coaster that explodes if you pedal forward. What could go wrong?
Title: Re: another new freecoaster - planetary gear engagement
Post by: MEAT on August 08, 2019, 10:47:53 AM
He's got fabulous hair, i trust him.
Title: Re: another new freecoaster - planetary gear engagement
Post by: Bunky on August 24, 2019, 05:37:17 PM
I've been riding one for a couple weeks.  It's basically the same internals as the Ezra hub but the clutch disc has a planetary gear in it and it engages on the hubshell instead of the axle so that when the hub moves forward the inside section of the clutch disc moves backwards pushing the pawls up.  When it moves backwards it moves the inside section forward enough to allow you to pedal forward with no resistance as long as you don't pedal forward faster than the hub is moving backwards.

It hasn't blown up on me yet, but I'm not the hardest on coasters.
Title: Re: another new freecoaster - planetary gear engagement
Post by: ediotism on August 26, 2019, 09:43:19 AM
https://bmxunion.com/daily/sneak-peek-inside-the-flybikes-magneto-cassette-hub/

in comparison, Fly came out with a cassette hub that uses two magnets. the entire engagement mechanism just has one moving part.

1. i wonder if this can be adopted into a freecoaster design? (currently with this magneto hub, the two magnets ATTRACT each other to pull the "pawl ring" into the teeth)

2. aren't magnets very brittle? any sort of impact to the axle/ pegs may damage it, i don't know if they've tested it enough and how much impact the hub can withstand

3. looking at their pictures, i'm guessing the 'pawl ring' can possibly be simplified to have, say 3 'pawls' instead of the entire ring being pawls but that'd probably require a higher level of machining precision to keep it working properly
Title: Re: another new freecoaster - planetary gear engagement
Post by: MEAT on August 27, 2019, 06:50:16 AM
They don't like impacts, either structurally or magnetically. Other downside is that magnetic force falls off very quickly with distance, so in effect they're a non linear spring, in this case they'll have less force when engaged, than when the teeth are riding over each other. If it were worth doing to reduce rolling resistance, shimano or some other major manufacturer would have done it.
Title: Re: another new freecoaster - planetary gear engagement
Post by: ediotism on August 29, 2019, 07:49:20 PM
Other downside is that magnetic force falls off very quickly with distance, so in effect they're a non linear spring, in this case they'll have less force when engaged, than when the teeth are riding over each other.

the two magnets have the least distance between them when the pawls are fully engaged, im guessing that'd make the attraction strongest in that state. but to prevent skipping, the magnetic force is most needed when the tips of the pawls are just touching (they'll never fully disengage because the magnets pull them together). So the magnets will have to be pretty strong, magnetically speaking

If it were worth doing to reduce rolling resistance, shimano or some other major manufacturer would have done it.
i'd give them the benefit of doubt, i like seeing innovation nevertheless. it's fine when a thousand new ideas fails, since we just need one to hit it right and it changes the industry. This hub, for instance, has one single moving part only. best wank material for engineers all round amirite?


they claim they use "neomidium magnets that pretty much last forever", so i looked it up:

1. strongest permanent magnet commercially purchasable - "Neodymium magnets larger than a few cubic centimeters are strong enough to cause injuries to body parts pinched between two magnets, or a magnet and a ferrous metal surface, even causing broken bones" from wiki

2. very vulnerable to corrosion so it needs protective coatings - should be fine being inside a hub

3. very brittle - "Magnets that get too near each other can strike each other with enough force to chip and shatter the brittle magnets themselves". even if they're well protected from killing themselves via engagement, it's hard to imagine how they can withstand sudden shocks like an icepick or even slamming the end of the peg into the ground
Title: Re: another new freecoaster - planetary gear engagement
Post by: JFax on September 04, 2019, 03:14:12 AM
Isnt it the Magneto hub that they have been testing for about 10 years?
Title: Re: another new freecoaster - planetary gear engagement
Post by: paranoidmexican on September 04, 2019, 02:06:36 PM
He's got fabulous hair, i trust him.

tell him he needs a haircut and he'll get dicked off