2 suggestions for bike physics

[HornetMaX]

2 sugeestions (potentially) for bike physics:

• Assuming GPB simulates the reaction torque of the engine revving up (torque applied to the chassis), it would be nice to have the possibility to model forward backward rotating engines. They are pretty popular in MotoGP (e.g. see the table here)
• Seamless gearbox ?

@Piboso: what do you think ?

MaX.

[iVolution]

Assuming GPB simulates the reaction torque of the engine revving up (torque applied to the chassis), it would be nice to have the possibility to model forward rotating engines. They are pretty popular in MotoGP

For someone who is not very familiar with that level of engineering... what do those "forward rotating engines" change to the physics of the bike?

[JamoZ]

Centrifugal forces of the internal moving engine parts if i`m not mistaken

[HornetMaX]

For someone who is not very familiar with that level of engineering... what do those "forward rotating engines" change to the physics of the bike?

Centrifugal forces of the internal moving engine parts if i`m not mistaken

Nice try JamoZ, but no, that's not it

A backward rotating engine has 2 main effects:

• a smaller tendency to wheelie.
• a smaller gyroscopic effect

The explanations for both phenomena are pretty simple too (yeah, you can read this !!):

• If the engine is forward rotating (i.e. the crankshaft spins like your forward wheel), when the engine revs up you need a torque to do that and (action reaction principle) an opposite torque will be applied to the chassis: this means that when you rev up, the bike will tend to pitch backward (wheelie). On a backward rotating engine it's the opposite: the bike will tend to pitch forward. The smaller the tendency to wheelie, the more you can open the gas (or the more the anti-wheelie control will not kick in). Drawback of backward rotating is that you need an additional transmission shaft (as you still want your rear wheel to turn in the "right" direction): so more mass, more friction, potentially a less compact engine etc.
• On a bike you have 3 main rotating parts: front wheel, rear wheel and engine's crankshaft. They act as gyroscopes: when their rotation axis direction is changed (e.g. when leaning the bike or when the bike turns) they generate "unwanted"(*) torques.  For a forward rotating engine the 3 parts are all rotating in the same direction and the "unwanted" torque is greater than in the case of a backward rotating engine (where the crankshaft, rotating in the opposite direction, "cancels out" part of the effect of the wheels).

MaX.

(*)
Gyroscopic torques/forces are not always "unwanted": the ones generated by the wheels make the bike stable (when spinning fast enough). However, too much gyro torques and the bike will become hard to steer/handle, less agile.

[iVolution]

thank you for the clarification using understandable language  . Well if its realistic there is no reason not to put it in the game right? You got my vote.