Originally Posted by citylights17@ho
Bill do you think that that is true of all HO cars including G3 type cars. thx mj
All things being somewhat relative IMHO; Smooth gear mesh in both load and unload conditions seems like the ticket to me whether its a modern inline or the venerable T-jet monkey motion.
It's just like the ring and pinion in a big car where toothloading patterns are critical. Certainly the forces are smaller in slot cars but no less important. Nowadays in competition the highend guys are fighting for small fractions in lap times. It is truly a marvel from whence we've come.
That being said the common theme seems to be that a smooth car with good throttle input manners trumps a twitchy rocket that is a chore to drive.
The variables car setup are many. Comm pressure, motor magnet strength, down force relative to magnet strength and tire profile, pickup geometry and spring strength. All factors of friction to a simpleton like me. A fine line that can never be drawn in black and white. In other words some stuff works in certain combinations and some stuff just doesnt.
I feel gear mesh is more of a yes or no proposition. It's either right or wrong. As we do spend a certain amount of time off throttle the backlash should be addressed. The total smoothness of a car is a factor of how the geartrain responds in both load and unload condtions providing all the other setup variables are reasonably correct.
Conversly, at some point, too much lap creates a scenario where the tooth contact points actualy slap or hammer against their mate. The tooth geometry is worn to the point that they are clubbing and not meshing smoothly. The clue here is visual to the naked eye, one gear moves excessively before the other engages. A trained ear can hear this on the test pack when other noises are not present.
Some folks consider gear selection tedious but is just a fact of life unless mated sets are purchased. I just keep trying till I get something that feels right and lap from there. No guarantees. I've got a few hundred gears for this and that, both used and new. As I go through the process they are sorted into simple piles - those that are fat/tight - those that are thin/loose - and of course the trash which is tossed immediatly. Ya just never know what's gonna work til ya get there. Cuz I'm old and blind it helps me to use the ole magnifiying glass to spot "tooth decay or irregularities so I dont waste time on a turd gear.
A complete lap provides one less thing to wonder about.