Originally posted by Q.C.Pak:

Diam la...dun bully bak jie ok

Bully who??

Originally posted by Bak la va:

come where, ma ta chu ah...........

Who talking to you?

Originally posted by seotiblizzard:

Fuck u.

come lar!

Don't know if this is correct but:

We all know that the individual electrons in an atom need certain levels of energy before increasing its energy level state.

The amount of energy required is peculiar to each jump in energy level.

Consequently when photons collide with the electrons (light shines onto the atom), only photons of certain energy levels will be absorbed by the electrons. The others will merely collide and bounce away.

So the colour you'll see is dependant on what photons are not absorbed by the electrons.

Also related: The photoelectric effect.

 

Originally posted by seotiblizzard:

Wont one la, i will always be yandao, no matter wad.

diam lar

Originally posted by seotiblizzard:

Where the star of this threaD??

shuddup lar.

Originally posted by Quetzalcoato:

i like to look at schoolgirl's school shoes, especially Converse or North Star brand ones.

those very dirty one... like grey or brown in colour due to dirt n because like never wash for a few months. Best if its puo puo lan lan, like tattered n torn.

n those schoolgirls with skinny tanned n slim legs. n must be wearing ankle socks one.

anybody got a fetish like mine?

 

You like hairy legs too?

Why?

TS scared of getting bumped?

Got toufu is it?

Originally posted by UltimaOnline:

 

Organic Chem is actually the most fun part of JC Chemistry, if you had attended my tuition, honestly. Coz I teach my students to UNDERSTAND while JCs force you to MEMORIZE BLINDLY. My students love mechanisms once I show them how mechanisms are soooo fun, and they now can draw all mechanisms without memorizing anything!

 

SBS2601D, now that you've graduated, wanna become an MOE teacher yourself? It may not pay as much, but at least it's more stable than the banking and finance industry. Choose your future carefully.

 

Wow.

How the heck you know where I'm headed to?

Honestly I never considered any of the subjects I took a bore. But chemistry certainly gave me one heck of a headache. Stuff like electrochemistry require me to put 110% effort in understanding before I could get anywhere.

And no. I don't memorise. As a result, I usually lose some marks here and there predominantly in those "define this and that" type of questions. Stuff people would say are "give-aways".

If you ask me, I would prefer studying physical chemistry. Now that's fun.

Originally posted by ^tamago^:

I get what you mean on the Voith part. That makes sense. See when I have time to pong 792Z.

By the way, for ZF when disengaging lock-up and revving up from second gear, techinically the gearbox does not drop to first gear, except in rare cases when the speed of the bus is really low, or in some LO's, which will result in a very strong jerk.

Yep. Rare cases they are indeed.....

Oh, and BTW....if you guys apply the same theory I used to try to figure out about the lock-up, then the W3E's "slip-gear" should also be the lock-up clutch in action.

Before the "slip" occurs, if the BC lifts his foot off the pedal, the engine rpm falls much steeper than the axle speed. If the BC suddenly jams the pedal, there is apparently a slight lag as the axle tries to catch up with the engine.

Once the "slip" occurs, you won't have such things anymore.

What luck!

Today managed to catch 9613Z....one of those VOs I mentioned.

You're right. It's a premature lock-up......

Thanks for tipping me off about 9208K.

Oh BTW....that's some pretty great recordings you have there, tammy.

In fact, the jerkiness of the KUB can be partly attributed to the (lack of) weight.

Originally posted by ^tamago^:

2nd paragraph: Everything is correct except that it does not downshift, it disengages lock-up at 2nd gear. The shift from 2nd gear to 1st gear occurs only at a very low speed (except LO which can be relatively higher) just as the bus comes to a stop, is characterised by a jerk, which is most audible on a SMRTB Dennis Lance just before it comes to a stop.

Voith does not lock-up..... :o

For Voith, if you notice, the 1st gear needs to be revved to high rpm because axle and engine are not connected. You'll get the feeling that the engine is pushing hard at the last stages of 1st, and yet the acceleration seemed to have plateued off. That's because of power loss in the high rpm regime without lock-up.

Upon transition to 2nd, the bus transits gears and at the same time locks-up. The difference with and without lock-up is obvious. Most voith buses don't stay long in 2nd.

The biggest clue to look out for the lock-up is the feeling that the acceleration does not match the engine's output. And if you notice, if the BC lets go of the pedal in 1st, the engine rpm drops at once. If its locked-up, the rpm should match the axle speed. For 2nd onwards you don't get that.

So if there's lock-up, when the hell did it engaged?

The answer came from taking a worn-out 792Z and a few other MKIIIs. These Voiths prove interesting. During transition to 2nd, unlike the normal voiths that lock-up and transit in a split second, these ones attempt to lock-up, and then transit. So what you hear is the high pitch whine of the engine suddenly getting lower and lower as the engine speed slowly matches the axle speed and then with a terrific jerk, the lock-up engages and the bus goes into 2nd at that same moment.

For that, this is where the biggest strength of ZF lies. A Voith down-shifting will not disengage lock-up unless its a 2nd to 1st. Consequently you'll notice that most Voiths prefer to kick-down all the way to 1st at relatively high speeds to achieve high torque input to the axle. For ZF, if the bus needs to disengage lock-up upon down-shifting to achieve that, it is capable of doing so. So for Voith, if it goes back to 1st at high speed, what you get is a overworked engine and practically no effect on the axle.

Just a side note, just like a manual where you lift your foot off the pedal and depress the clutch, for the lock-up clutch to engage the same should occur. But for some worn-out ZFs, the engine does not stop and what you get is a nauseating grinding sound as the lock-up engages.

 

Originally posted by ^tamago^:

 

No... it can't. Never seen any VO or even any ZF do it in my life. Probably I need to put in timings for comparision.

0:05 start 1st gear
0:08 2nd gear
0:11 2nd gear lock-up
0:15 3rd gear
0:25 4th gear
0:27 3rd gear
0:32 2nd gear
0:38 stop 1st gear
0:53 start 1st gear
0:56 2nd gear
0:59 2nd gear lock-up
1:05 3rd gear
1:21 4th gear
1:51 3rd gear
1:56 2nd gear
1:59 stop 1st gear
2:14 start 1st gear
2:16 2nd gear
2:18 2nd gear lock-up
2:20 3rd gear
2:27 4th gear
3:13 3rd gear
3:16 2nd gear
3:19 stop 1st gear

Actually why not?

The ZF unlike the Voith is capable of engaging/disengaging in just about any gear it likes. Which makes it more versatile.

A typical VO that needs to pick up speed faster usually down-shifts, disengages the lock-up briefly, engages, and up-shifts again.

The same applies to all other types using ZF.

Voith can't. Engaging lock-up between 1st and 2nd means thus.

Originally posted by ^tamago^:

 

No no.... for VO's the lock-up gear setting is fixed. It can't choose to lock up at 2nd gear (for those set to 1st gear lock-up) unless it is already at 2nd gear.

That's why I was really surprised!

Originally posted by ^tamago^:

There's a distinction between gear change and lock-up when there's an abrupt drop in rpm.

For the latter, I know some buses tend to lock-up too early and this means it has to lock-up again. This is due to a faulty setting, and fits the description you have described, which is, it fails half the time. They did not move on to the second gear but tried to rev again at first gear once more.

For the former, the pitch of the engine will be entirely different (though it may sound minimal to most people) when it's at second gear, and the rpm drop is actually not as abrupt as a faulty lock-up.

Most ZF gearboxes will, when it had cleared the first gear then dropped back to second gear and wishes to accelerate, lock-up at the second gear. This lock-up will sound like it is dragging and will take longer. The ones which will occasionally jump back to first gear and rev up again are usually LO3x's and 6HP's on B9TL and KUB. A small number of Striders do that too.

Maybe you can give me the regos of the VO3x's next time then I'll visit the buses. (:

Given enough pressure on the pedal, those that lock-up at 2nd are capable of doing it at first.....

So nothing unusual about these cases. But for those that lock-up at 1st to do it at 2nd instead is more unusual I would say.

So it all depends on the BC's mood.

 

Originally posted by Scania:

Listen properly, and compare it to your normal ones. I think we may need a sound recording of another VO for comparison.

Nah....if I'm lucky I would get to take this bus some day.

Originally posted by ^tamago^:

There's a distinction between gear change and lock-up when there's an abrupt drop in rpm.

For the latter, I know some buses tend to lock-up too early and this means it has to lock-up again. It should be a faulty setting.

For the former, the pitch of the engine will be entirely different (though it may sound minimal to most people) when it's at second gear, and the rpm drop is actually not as abrupt as a faulty lock-up.

Maybe you can give me the regos next time then I'll visit the buses. (:

Honestly I can't tell much from that clip....not to say that the quality sucked, but I have to be there to experience it haha.

Initially I thought that for such VOs the lock-up is too early. But now I think back, these buses are closer to the Lance, MKIV etc etc than 9208K. These buses change to 2nd at fairly low rpm, then attempt to pull through 2nd at even lower rpms and then struggle to proceed to lock-up at 2nd. Obviously there's a reason why the VOs are usually made to lock-up at 1st and at fairly high rpms, because half the time you get a kick in your butt when the bus switches back to 1st.

In that clip however, I have no inkling of where's the lock-up, so honestly I can't say much about it. If you're looking for the above mentioned buses, I would say it is more likely to occur in the batch 3 types. Some I remember include 9630Z, 9638C. Light pressure on the pedal would induce that effect on these buses.

If the lock-up is early, I would expect a pause and a slight rpm drop. But for these VOs, the rpm drop is a little steep, and the pause is shorter than what I would expect for a lock-up. Lock-up takes longer and more jerky. And what I thought was transition to 2nd for these buses should actually be the lock-up. The change is more obvious and the drop in rpm is less.

And no wonder too.....a quick check on the gear ratios showed that the difference between 1st and 2nd are the greatest amongst the gears. Which proved all the more that these buses were actually changing from 1st to 2nd rather than locking-up.

Dunno much.

But such flexibility is not such a great advantage in combat. The ship can do it, can the crew do it, even with extra training? Even if the crew is interchangeable too, or can swop individuals suitable for the different roles, do you honestly think it will work?

If I'm the crew I would call it a curse. And I'm sure the USN knows that.

It is really more advantageous rather in costs. The same hull for different roles....why not?

Now that I thought a little on the sound clip I heard on 9208K, here's my comments.

No. That's not the only VO that locks up at 2nd. A number do that. While the VOs are supposed to lock-up at 1st, there are some ZFs that are flexible enough to do that at 2nd instead.

Now that I think back, those VOs I took that abruptly "locked-up" early in 1st were actually transitions into 2nd, after which, the lock-up occurs. Half the time, this fails.

Initially I thought it was the lock-up disengaging because it engaged early.....but now I reckon its actually 2nd to 1st when the bus starts shuddering. The steeper than expected drop in rpm for such buses at that stage should be the biggest indication of 1st to 2nd rather than lock-up.

Originally posted by ^tamago^:

Mercedes-Benz OC500LE SMB13Z on 75
Esplanade to Shenton Way MAS Bldg. Notice the unique sound of the electronic suspension at work at 3:32 and 5:02.

Volvo B10M Mark IV DM SBS927C on 100
Finally one without TV Mobile!

Volvo Olympian SBS9208K on 132
The only VO3x with its ZF gearbox locking up at 2nd gear instead of 1st, which makes it switch gear like a Dennis Lance, Mark IV Strider or DM.

Sounds exactly like any other VO leh....sounds like lock-up at 1st also.

 

Originally posted by SBS9888Y:

you hear when the bus moves. its gear1, lock-up, change to 2, 3, 4, 5 den 6 for b9tl and kub

Would like to point out that the KUBs are rather flexible, they can lock-up at 1st also. It depends on how much pressure the BC applies.

Interestingly the same can be said for the ZF4s although they are not as flexible. They need to be really pushed to the limit to induce this effect.

 

Originally posted by UltimaOnline:

You're totally welcome, [e].Le-V!

 

(All you Sec 4 graduating folks, if you're going JC next year and would like 'A' level Chem tuition, you know where to contact me...

 

Pssst. It's really true that how you see and approach JC Chemistry, really makes a BIG difference whether you'll enjoy JC Chemistry or not. I help the students to see that Chemistry's really actually enjoyable, where JCs make it (falsely) seem a boring torture.)

Was a torture leh.....but not a boring torture.....kinda being more of the thousand-cuts execution type.....especially organic chem.

And why got people ask why got people ask what men/women really want?