| Author |
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Blake
| | Posted on Thursday, June 06, 2002 - 12:42 am: | 
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Quote:some of the exotics had very high TC (recall the picture of the scientist holding a cube that is glowing in the center, but can be touched on the outside)
Oops, that would be a very low TC. You're recalling the space shuttle carbon carbon tile demonstration. That was totally cool. 
Nanotubes! I ain't buying no motorcycle that has nonotubes!
Sure would be intersting to see what a Buell will look like in 2102. |
Bluzm2
| | Posted on Thursday, June 06, 2002 - 12:57 am: |
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Blake,
Another modern marvel with an extremely low TC.
Aerogels!
I remembered this pic from a few years ago. Pretty classic in the aerogel circles (I guess).
Brad
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Mikej
| | Posted on Thursday, June 06, 2002 - 09:38 am: |
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You beat me to the Space Shuttle tiles. I was in a demo once years ago where a guy took a torch and heated one of those tiles, then asked for a volunteer to hold the tile. Then, after the "volunteer" didn't scream in agony, we all got to handle the tile. Neat stuff. |
Dhutty
| | Posted on Thursday, June 06, 2002 - 09:40 am: |
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I feel so dumb. |
Mikej
| | Posted on Thursday, June 06, 2002 - 10:01 am: |
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If you're trying to keep heat on one side and away from another side, then low conductivity is good, if you're trying to suck the heat out of one side though then high conductivity is the way. Space Shuttle, keep the heat out or fry the pilots. Engine, get the heat out or fry the engine.
So, now I'm wondering if there is any market for a low thermally conductive paste to "paint" onto surfaces, like, oh, say, an exhaust or gas tank maybe? Be real nice to not get a thigh or hand burn from a hot header. |
Reepicheep
| | Posted on Thursday, June 06, 2002 - 10:35 am: |
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Active noise cancellation would be pretty straightforward... the waveforms to be cancelled would be basically known ahead of time and of a consistent character, it would simply be the frequency that changes, and due to the mechanical inertias in the motor they could not change that rapidly. All these factors significantly simplify the problem.
Heck, in theory, you might not even need the traditional microphone closed loop system, the ECU or the tach leads probably give you everything you need to know, since you already know the waveform that you want to cancel. This would still be closed loop, but not really a feedback system, which would further simplify the issue. And the transducers would be pretty simple, and could probably be mounted right on the rocker boxes (or other acoustically transparent windows to the "noise hotspots" .
The flaws of these types of noise cancelling systems in their current "toy" applications (like silencing headphones) is that while they lower ambient noise, their imperfect nature leaves artifacts that are arguably more annoying then the ambient noise they claim to cancel. This is because of the random nature of what they are trying to cancel. For a known waveform (like a pushrod air cooled engine), it could work pretty well (on paper... not sure what the lab would bear out).
Very interesting... very cool! I can see it now... I want to remap the FI for better low end grunt, and remap the Noise Controller for a little more bark between 2000 and 3500 rpm  |
S2no1
| | Posted on Thursday, June 06, 2002 - 10:54 am: |
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Blake,
See I told you I needed to bruch up on my materials. Thanks for the correction. Now if I only had time to ride the bike more.
The foam looks real promising for heat sinks. Low strengh applications only however.
Arvel |
Anonymous
| | Posted on Thursday, June 06, 2002 - 11:09 am: |
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All this technical talk on composites on future Buells is great but how about applying it to the real #1 sport,canoeing
I just gotta ask... Why post this anonymously??? - Admin  |
Mikej
| | Posted on Thursday, June 06, 2002 - 11:14 am: |
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As in the cement canoe competitions where the teams try to make the lightest concrete canoe possible? |
Anonymous
| | Posted on Thursday, June 06, 2002 - 12:24 pm: |
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There's some confusion in this discussion in mixing different material properties: namely, thermal conductivity and specific heat. Conductivity is how quickly heat moves from one end of a material to the other; specific heat is how much the temperature changes for a given weight of material for a given amount of heat. A low specific heat material sees big temperature changes for a given amount of heat; a high specific heat material, such as water, takes a lot of heat to increase temperature, almost twice as much as ethylene glycol, for example -- which is one reason why racing vehicles run pure water in their cooling systems instead of an anti-freeze mix. Water is a near ideal coolant, as it has both high conductivity and about the highest specific heat out there.
The space-shuttle tiles and the aerogels have the combination of extremely low conductivity and very low specific heat. It doesn't take much heat to get the surfaces of these things glowing red, and when you touch it, whatever small amount of heat is on the immediate surface flows quickly into your high-specific-heat fingers (properties similar to water), creating a local cool spot. Because of the low conductivity, the heat in the rest of the heat in the material stays relatively put, and you don't get burned.
Interestingly enough, some very conductive materials, such as gold, have fairly low specific heat. |
S2no1
| | Posted on Thursday, June 06, 2002 - 12:43 pm: |
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MikeJ,
Careful there, we need to say CONCRETE, not CEMENT.
Anon,
That's a great point. Why post Anon?
Arvel |
Johnnybravo
| | Posted on Thursday, June 06, 2002 - 12:54 pm: |
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Cause it is "you-know-who" |
Anonymous
| | Posted on Thursday, June 06, 2002 - 01:57 pm: |
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"you know who"? Are you guys kidding me? Does Erik Buell canoe?If he designs a canoe i'll buy one today!!! |
Johnnybravo
| | Posted on Thursday, June 06, 2002 - 01:59 pm: |
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He has a 130HP canoe  |
Mikej
| | Posted on Thursday, June 06, 2002 - 02:35 pm: |
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Okay, concrete then.
Remember, it's not the size of the canoe that matters, it's the torque behind the paddles that counts.
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Anonymous
| | Posted on Thursday, June 06, 2002 - 06:51 pm: |
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Ok Mikej
Before Blake kicks this post off for non Buell. I saw your post about ticks + mounds,get this,recently while canoeing in my local river,i went to shore to take a leak,had to stop,picked up a (missing tip)Parkhill Complex fluted paleo point,Coshocton flint!!!
Sorry Blake,its just the power that thing had,about 11,000 years of power! |
Anonymous
| | Posted on Thursday, June 06, 2002 - 06:54 pm: |
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What the hell is that? |
Mikej
| | Posted on Friday, June 07, 2002 - 09:38 am: |
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Anony1,
You, of course, immediately left it where it lay and notified your state archaeologist, right?
Anony2,
see:
Roosa, Wiliam B.:
1977 Fluted Points From the Parkhill Site. University of Michigan Museum of Anthropology, Anthropological Papers 61:87-122
Or, if you're interested, follow through on any of the following:
Guide.
Virtual museum.
Index.
Make your own.
basic pics.
Or, just go Ride your bike. As the old prospector saying goes, gold is where you find it. The archaeologist says watch where you step for we walk on our past, or something like that. |
Anonymous
| | Posted on Friday, June 07, 2002 - 10:09 am: |
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Mike,no way,it would have gotten more damaged by farm equipment or leaked on by another canoist,but i did report its location of find+showed it to a Dr.R.M.Gramly of the Buffalo Museum of Science + a regional archaeologist for the Ohio Historical Society. |
Cyclone1
| | Posted on Wednesday, May 21, 2003 - 08:20 pm: |
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...if Eric has a 130 hp canoe, hopefully he will transfer it into his motorcycles and make the rest of the world happy, hehe
Frank |
Imonabuss
| | Posted on Wednesday, May 21, 2003 - 10:40 pm: |
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Reepicheep,
Sure, the waveform for noise cancellation is easy, but to amplfy it to comparable power would take some big ass speakers and a heck of a lot larger alternator than the Buell has! That's why no one does it. Now we could cancel the noise in your helmet with less power and smaller speakers, so you could be riding in silence while all the old ladies sitting on their porches shake their fists at you, but that's kinda the opposite of what everyone wants... |
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