gmocko on Pinkbike

gmocko hasselhofbikes's article

Dec 3, 2018 at 9:44

Dec 3, 2018

Video: Nicholi Rogatkin & Reed Boggs Ride Snow Bikes... Would You?

it is not clear how the suspension on the sno-bike works. Your feet mount to the top of the skis, the skis then attach to the frame where the suspension is located .... wouldn't your knees do most of the shock absorption? It seems the suspension would not do anything. The link is quite cool as it allows each ski to pivot into turns.

gmocko OneUpComponents's article

Aug 9, 2016 at 7:19

Aug 9, 2016

The Drop Tower of Destruction - Video

@jordanneedsafork: Mass and height both matter ... though it is not just a conservation of energy, there is also conservation of momentum. Impact is not that easy - the stiffness of both bodies, mass, coefficient of restitution, time of impact, etc all play a role in this. When two bodies collide - momentum is conserved, energy is not.

gmocko OneUpComponents's article

Aug 9, 2016 at 6:23

Aug 9, 2016

The Drop Tower of Destruction - Video

@OneUpComponents: So yes I do agree with you ...

gmocko OneUpComponents's article

Aug 9, 2016 at 6:22

Aug 9, 2016

The Drop Tower of Destruction - Video

@OneUpComponents: well an impact load this is not entirely true you must consider the time of impact (impulse time). Actually the shorter the time the larger the force. During impact one must consider the "stiffness" of each body colliding as well. The mass still plays a large part but so does the time of impact.

gmocko OneUpComponents's article

Aug 9, 2016 at 6:12

Aug 9, 2016

The Drop Tower of Destruction - Video

@johny88: While agree that the shock does need to be considered. However there must be conservation of energy. All the energy at the beginning of the drop should equal all the energy at the end of the drop Potential Energy = mgh Kinetic Energy - 0.5mv^2 These two must be the same ... ignoring losses of course. However, with impact / shock loading other factors must be taken into account.

gmocko RichardCunningham's article

Jun 27, 2016 at 17:04

Jun 27, 2016

First Ride: Tantrum Cycles Missing Link Suspension

@tcmtnbikr: drew a Kinematic diagram - https://drive.google.com/open?id=0B9PSG9tyeopbbWdEektOZlhHYU0 I modeled the shock as a set of sliding links. For position analysis, can ignore those links and could do an analysis of the moving links. It is great when engineering and hobbies collide!

gmocko RichardCunningham's article

Jun 27, 2016 at 16:20

Jun 27, 2016

First Ride: Tantrum Cycles Missing Link Suspension

@gaberoc: just constructed a kinematic diagram. I got the same as you. In total there are 6 links and 7 revolute joints. The 4 bar (rocker, link to shock eye, shock eye to frame, frame) can be analyzed quite straightforward. The back link (to the rear wheel) can be analyzed as another 4-bar with 1 link moving in space. The links connected to the eye of the shock, when in line is in a toggle position and effectively locks out the motion. Cool design though aside from the paint job seems to be quite complex with the number of pivots.

gmocko

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