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Archive through December 21, 2004Lornce30 12-21-04  12:08 am
Archive through December 18, 2004Blake30 12-18-04  02:27 am
         

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Aaron
Posted on Tuesday, December 21, 2004 - 12:39 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Lornce: perfect!
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Aaron
Posted on Tuesday, December 21, 2004 - 12:42 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Ray, M1 ... I agree ... I also prefer a bike that makes it's power with relatively high torque and low rpm. More fun to ride IMO. We're the target market for V-twins.
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Blake
Posted on Tuesday, December 21, 2004 - 02:47 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

The little 3.8m earth station satellite antenna that I'm working on sees upwards of 10,000 FT*LBs of torque at its elevation axis in operational wind conditions. It must be able to operate/track/slew when encountering such wind loading. It uses a 0.5 HP electric motor to do so. It slews at 0.5o/s which equates to 0.083 RPM. Work it out... 10,000 FT*LBs x 0.083 RPM / 5252 = 0.16 HP. So the 1/2HP motor has plenty of margin even considering around 20% parasitic drivetrain losses (lots of gear reduction and an inefficient worm driven screw jack actuator).

Torque doesn't matter without revs. : )
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Glitch


Posted on Tuesday, December 21, 2004 - 10:56 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

So torque is work, and horsepower is how fast you get the work done?
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Jlnance


Posted on Tuesday, December 21, 2004 - 11:13 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Glitch - HP is the rate that work gets done, but torque is not work. Torque is the angular equivalent of force. Just as force actually has to cause something to move in order to do work, torque has to cause something to turn in order to do work.

(I loved Physics )
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Bigdaddy


Posted on Tuesday, December 21, 2004 - 01:58 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Jim, My favorite weekend work 'stuff.'

PhyDiffy rules!
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Jlnance


Posted on Tuesday, December 21, 2004 - 02:17 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Greg, I love the hat. Where did you find it?
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Bigdaddy


Posted on Tuesday, December 21, 2004 - 02:23 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Jim, You gotta to get yourself one!

http://www.cafepress.com/subjective/216996

That's were I found the pic, but mine was a gift from some Indentured Servants (read as grad school students.)
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Mr_grumpy


Posted on Tuesday, December 21, 2004 - 04:01 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Vell here ve are in ze nice kettle of fisk, as ve scientists say, haha.
Ze whole problemm can be easily explained like ziss.
Iff ve calculate ze size of ze hoss or to give it it's prrroper name Pferde und ve divide by ze bs coefficient, ve vill find zat ze following statement holts true.

"There ain't no substitute for cubic inches"
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Dsergison


Posted on Tuesday, December 21, 2004 - 04:13 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

^^^ yeah but it dont roll off the tounge as well as:

"no replacement for disaplacement"
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Blake
Posted on Tuesday, December 21, 2004 - 04:53 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Dave (Glitch),
"So torque is work, and horsepower is how fast you get the work done?"

Not quite. Work would be the torque times the number of revolutions and to get it in meaningful units of FT*LBs, we would need to multiply by 2P. Divide that by how much time it took in seconds to complete that work and you have power in FT*LBs/s. Divide that by 550 and you have transformed power in units of FT*LBs/s to HP. : )


Or use minutes for your time unit of measure and divide by 33,000 to transform power from units of FT*LBs/min to HP.
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Rek


Posted on Tuesday, December 21, 2004 - 05:20 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I've been following this thread in the hope that some of the obvious intellegence (that there book larn'n) displayed will rub off on me. So far it hasn't.

So...my obviously uniformed question would be why can my antique '73 GT750 go as fast at top end (~125mph) as my awesome new(ish) S3T w/ twice the cc's?

And please don't call me stupid

Rob
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Ray_maines


Posted on Tuesday, December 21, 2004 - 05:44 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Just a guess here; the 750 motor turns twice as many RPM's as the S3 but is geared way lower. The old 750 doesn't have the HP to pull higher gearing, but if you could sprinkle magic fairy dust on the old dear and give it twice as much HP you could gear it higher and go much faster.
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Buells Rule!
(Dyna in disguise)



Posted on Tuesday, December 21, 2004 - 06:11 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

There ain't no substitute for cubic inches

So long as those cubic inches are either geared to the moon & its a short race, ir you can rev it to 12,000+ rpms.

If the cubic inch theory is correct, why will a lil ole 600cc kick the snot out of a 1450cc V-twin?
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Lornce


Posted on Tuesday, December 21, 2004 - 07:11 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Rek,

If your S3 is '98 or newer, it'll sport a 100HP T-Storm motor and the only thing keeping it from seeing 140-145 mph is short gears. What is it with you American guys and short gears? Why are you always in such a hurry? ; )

No matter how tall you gear your GT750 Water Buffalo, it'll never have enough power to pull beyond 120-ish or so. In fact, over-gear it and it'll not even see 120-ish in 5th if the rpm for peak HP production can't be reached.

Hope this helps.

Lornce
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Rek


Posted on Tuesday, December 21, 2004 - 07:39 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I'm getting a glimmer of understanding here. Just because my John Deere 8840 has a 500hp engine doesn't mean it'll go 500 mph... Still you'd think a modern 1203cc engine could run long (tall?) enough to out run a puny, 30 year old 750cc.

But like they say, facts is facts, and whether it's gearing or just plain ol' umph (torque?)the '73 Smoker stays right w/ the Buell all day long (as long as you discount the minor wiring issue...)

Don't get me wrong, the Buell gives me a genuine boner like nothing else, while the Suzy is just a casual little toss we take out for a spin once in a while (like your best friends slutty sister).

Whatever. If its got two wheels and'll pull the hat off my head I'm game.

Rob

(Message edited by rek on December 21, 2004)

(Message edited by rek on December 21, 2004)
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Lornce


Posted on Tuesday, December 21, 2004 - 07:52 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Rek,

Can't vouch for your mind on your buddy's sister, but try to get your head around the fact that your Buell - will - go 140-145 mph.... if you gear it tall enough.

From the factory they're geared to provide optimum acceleration in the speed range they're expected to be ridden on public roads. Or for wheelies: I'm not sure which.

Your 2000, if stock, has 27/61 pullies. Try winding it out with 29/61 pullies and you'll see what I mean.

You'll need to figure a way to recalibrate your speedo, though, cause your bike's speedo pickup is on the 27 tooth countershaft pulley.

FWIW, 99X1 has figured out a way to do just that.

Lornce
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Reepicheep


Posted on Tuesday, December 21, 2004 - 10:44 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Rek, it's because your GT750's speedometer is off by more ; )
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Jlnance


Posted on Wednesday, December 22, 2004 - 09:44 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Blake, from CNN:

The successful launch was a critical milestone for the Delta 4 Heavy, which features three of the company's common core boosters joined side-by-side. Fired simultaneously, each of the three hydrogen-powered Rocketdyne-built RS-68 main engines generates 17 million horsepower, about the equivalent of 11 Hoover Dams.

http://www.cnn.com/2004/TECH/space/12/21/delta.launch.ap/index.html
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Glitch


Posted on Wednesday, December 22, 2004 - 10:53 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Yeah well that's all well and good, but how's it handle the twisties.
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Mr_grumpy


Posted on Wednesday, December 22, 2004 - 12:38 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

What Twisties?
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Fdl3


Posted on Wednesday, December 22, 2004 - 12:50 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Well, with that much power, I would imagine that it can darn near twist anything!
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Tripper


Posted on Wednesday, December 22, 2004 - 03:57 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)


quote:

but how's it handle the twisties.



Typical sensitive to being underpowered Bueller response.
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Rek


Posted on Wednesday, December 22, 2004 - 06:00 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Rek, it's because your GT750's speedometer is off by more

Darn! I was hoping nobody would clue in on that.

Rob
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M1combat


Posted on Wednesday, December 22, 2004 - 06:13 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

"Typical sensitive to being underpowered Bueller response."

Typical sensitive to always riding a boat non-bueller response.
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