Ask Dr Stereo...

Non Bike related Discussion - no politics or religion pls.

Postby ZX10R King » Thu Jun 01, 2006 5:26 pm

Stereo wrote:
Zombie wrote:Thanks for the insightful answer to my elephant question, however after more pondering it doesn't make logical sense.
Take chickens for example, they are smaller than cats but their eggs are huge!
How come?


Avarians cannot be compared to mammals since their reproductive systems are completely different. Cats do not lay unhatched eggs...


Or any other type of eggs, for that matter :D
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Postby Strika » Thu Jun 01, 2006 6:31 pm

Dear Dr. Stereo,

After recent events I have taken to reading this thread. I won't bore you with the details as to how i started reading it, except to say it involved several houshold appliances, a young girl, and several thousand dollars in solictors fees! Say no more!

Dilli is on fire with almost total anarchy ruling the streets, apart from those streets our brave and unfortunate soldiers roam. In parts of south America people are losing there lives to the wars fought over cocaine. The Sudan and many other countries are suffering massive famine and economic ruin.

My question to you is, why do the bars on my bike wobble as I decelerate with no hands on the bars, but only between 80 and 60 kph? :D
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Postby Mizz ZZR » Thu Jun 01, 2006 8:19 pm

That handlebar wobble probably happens just as you run over the cat that laid the golden egg :shock:
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Postby Stereo » Thu Jun 01, 2006 10:45 pm

ZX9R King wrote:
Stereo wrote:
Zombie wrote:Thanks for the insightful answer to my elephant question, however after more pondering it doesn't make logical sense.
Take chickens for example, they are smaller than cats but their eggs are huge!
How come?


Avarians cannot be compared to mammals since their reproductive systems are completely different. Cats do not lay unhatched eggs...


Or any other type of eggs, for that matter :D


Cats have eggs that are impregnated in the uterus.... like all mammals...
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Postby Stereo » Thu Jun 01, 2006 10:56 pm

Strika wrote:My question to you is, why do the bars on my bike wobble as I decelerate with no hands on the bars, but only between 80 and 60 kph? :D


That is a very good question....

While you are riding your bikes tires and wheels turn, causing centrefugal force... Partly this force keeps your bike from falling over.... but that is not important to the answer.... Your wheels spin at a certain rate, at the time you pass through this 80 to 60 kph the inertia of the cylinders in your engine must be at a similar frequency as the centrifugal forces of your spinning wheels, this will cause an unusual effect..... wobbling.... (also known as speed wobbles or to be fancy about it "resonant frequency oscillations")

To resolve this issue, simply turn your engine between 10 and 30 degrees sideways this will change the inertia application and remove the wobbles... It may be impractical though...
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Postby ZX10R King » Fri Jun 02, 2006 6:56 am

Stereo wrote:
ZX9R King wrote:
Stereo wrote:
Zombie wrote:Thanks for the insightful answer to my elephant question, however after more pondering it doesn't make logical sense.
Take chickens for example, they are smaller than cats but their eggs are huge!
How come?


Avarians cannot be compared to mammals since their reproductive systems are completely different. Cats do not LAY unhatched eggs...


Or any other type of eggs, for that matter :D


Cats have eggs that are impregnated in the uterus.... like all mammals...


This is true, but they DO NOT lay any eggs, unhatched, or otherwise....That was the point I was trying to make :D
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Postby Stereo » Fri Jun 02, 2006 7:31 am

ZX9R King wrote:This is true, but they DO NOT lay any eggs, unhatched, or otherwise....That was the point I was trying to make :D


Your weird...
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Postby ZX10R King » Fri Jun 02, 2006 7:34 am

Stereo wrote:
ZX9R King wrote:This is true, but they DO NOT lay any eggs, unhatched, or otherwise....That was the point I was trying to make :D


Your weird...



Thank you....
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Postby mrmina » Mon Jun 05, 2006 3:38 pm

Dr Stereo

After reading some pages on this forum, i have a question.

We had a new apprentice start work not long ago and we had to intiate him, so we thought there is nothing better than rooting him in the bum without vaseline. Then it dawned on me, where do zip ties come from :?:
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Postby FrogZ » Mon Jun 05, 2006 4:33 pm

The scary part is I just KNOW there is an apprentice walking VERY funny at the moment with his butt held together by zip ties .... :shock:
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Postby gizmo » Mon Jun 05, 2006 8:03 pm

Are you an apprentice Frog? :wink:
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Postby Stereo » Mon Jun 05, 2006 8:45 pm

mrmina wrote:Dr Stereo

After reading some pages on this forum, i have a question.

We had a new apprentice start work not long ago and we had to intiate him, so we thought there is nothing better than rooting him in the bum without vaseline. Then it dawned on me, where do zip ties come from :?:


Zip ties come from Zipland.... a small independant state off the coast of Lapland (where laps come from)...
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Postby Stereo » Mon Jun 05, 2006 8:46 pm

gizmo wrote:Are you an apprentice Frog? :wink:


No... I am a traffic warden on duty in Iraq.
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Postby Strika » Tue Jun 27, 2006 10:00 am

Dear Dr. Stereo,

When I bought the racer originally in 1996 I ran 14/44 at Broadford to start with. As my lap times came down and corner speed improved, I gradually dropped teeth off the back till I ended up with what i ran on Sunday which was 14/41. Now that I am getting back a little of my old turn speed, I am finding I am running out of revs here and there, and therefore have to compromise turn speed so i don't sacrifice exit drive. The modern stuff pulls so much harder off the turns than mine, so I need to take wider entries, square off and drive out earlier to stay with them down the chutes.

Now I hadn't really taken too much notice of my wheelbase, since the bike was steering OK up till then. However in the last dry race, I found the front was starting to push. With the bars starting to turn in a little as the front lost grip. I took a good look at the set up then and noticed how far back the wheel was sitting in the swingarm and figured that pulling it forward from the last adjuster may actually improve my steering too .

So, here is the deal. I am finding third too low and fourth too high for turn 1. 3rd i have to slow down too much to not have it bouncing off the limiter when I need the drive. 4th is too tall too pull hard off the turn.

Turn 3 (crash) is fine in 3rd, but maybe could go a tad taller as then I could hold that gear all the way to the straight. ATM I am just running short of Revs on the little pit straight and either have to button off early or go up and then back a gear, so I want to avoid that.

So my question is this. If I ran 15/41, do you think then that 3rd would do for turn 1, and would I pull crash with it??? If not 2nd would be OK as long as I short shifted into third before the flip flop and got on it real early out of it onto the pit straight!

Or go 15/43 and see if that would be better??? I am leaning towards 15/43 as I reckon I could pull that difference out of crash and then hold third all the way to the straight and then third again for turn 1!!! What ya reckon??? Am I barking up the wrong tree??? :D
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Postby Stereo » Tue Jun 27, 2006 10:30 am

Dear Strika,

Broadford is an unusually short track, you have done well to gain as many places as you did.... Your bike is underpowered compared to the leaders and you will struggle to beat them no matter what teeth ratio you have... It is ofcourse undesirable to have to change gears just before the end of a straight but it is at the END of the straight, so a very minor tweek would be the best for you.... If the time and budget was there I would recommend several days of testing with different ratios, because every combination has an up and a down side... You will lose revs for speed, or speed for revs.... Let me test ride your bike around broadford for a definitive answer...
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