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Author Topic: BBarn and Robfreys A/BG liner  (Read 12526 times)
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robfrey
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« on: November 28, 2009, 06:24:45 PM »

Well, you gotta start somewhere.









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lvsalt
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« Reply #1 on: November 28, 2009, 06:56:21 PM »

Goodluck with your project cheers
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Gary Cole     DCWATERJET Z
robfrey
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« Reply #2 on: November 28, 2009, 07:06:03 PM »

We will be water jetting many of the parts including the bulkheads.
Got a local guy here that is very reasonable and gives quick service.
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jdeleon
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« Reply #3 on: November 28, 2009, 11:05:39 PM »

I see your using Ashlar.... my favorite cad is cobalt.
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robfrey
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« Reply #4 on: November 28, 2009, 11:32:47 PM »

I see your using Ashlar.... my favorite cad is cobalt.

Wow, i thought i was the last person left on the planet to still be using this stuff.
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Jonny Hotnuts
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« Reply #5 on: November 29, 2009, 12:34:44 AM »

I would recommend a rounded lower section (not a flat bottom) for safety and to loose the the low pressure area (and drag) generated by attempting to keep air from going under the vehicle.


I would also suggest inline front wheels. In the event of a tire failure inline front wheels will allow for some degree of stability and the ability to control the vehicle where a side by side arrangement would cause the vehicle to pitch to one side.


-also-
The cheese wedge nose is only efficient at speed over 700 mph (check out the term "wetted surface area"). A more rounded nose will lower Cd and increase speed for the potential speeds achievable. My personal recommendation is to look at the D.Vesco nose on the 'nator or the nose on the BUB MC liner and take design aspect from these examples.

Good luck
~JH
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jonny_hotnuts@hotmail.com

"Sometimes it is impossible to deal with her, but most of the time she is very sweet, and if you caress her properly she will sing beautifully."
*Andres Segovia
(when Im not working on the car, I am ususally playing classical guitar)
stratman59
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« Reply #6 on: November 29, 2009, 08:33:08 AM »

Good luck guys  cheers

Just wondering why did you decide on a flat bottom

Robbie
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SPARKY
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« Reply #7 on: November 29, 2009, 10:10:57 AM »

down force  huh
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Miss LIBERTY,  changing TKI  to noise, dust and RUST!!!

The # 1 issue is: TO KEEP THE REPUBLIC      
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"Security is mostly a superstition. It does not exist in nature, nor do the children of men as a whole experience it. Avoiding danger is no safer in the long run than outright exposure. Life is either a daring adventure or nothing."   Helen Keller
Dave Haller
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« Reply #8 on: November 29, 2009, 10:35:45 AM »

Looks like you and Brandon have been really busy. Stay in touch my friend and good luck with the build.
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lvsalt
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« Reply #9 on: November 29, 2009, 10:38:45 AM »

front end reminds me of the Brant and Wright liner, They are trying
to reach there goal of 200mph, Im not sure what your goal with the
car is, being an A/BG I would (GUESS) 300mph.


* brantandwright.jpg (138.58 KB, 760x570 - viewed 276 times.)
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Gary Cole     DCWATERJET Z
bbarn
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« Reply #10 on: November 29, 2009, 11:08:40 AM »

Sparky,

This is just the first draft of the solid model to get into the virtual wind tunnel. We have about 40 days left on testing and design, once we start getting data we can determine if/what we need for down force modifiers.

Ivsalt,

Somewhere in the 300's would make me smile, somewhere in the 400's would make me happy!  grin

Dave,

This is all Rob's fault! If he would have never invited me over to "look" at the lakester, I wouldn't be doing this. Salt really effects people doesn't it, this must be what crack is like to a junkie.
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I almost never wake up cranky, I usually just let her sleep in.
robfrey
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« Reply #11 on: November 29, 2009, 01:44:49 PM »

Good luck guys  cheers

Just wondering why did you decide on a flat bottom

Robbie

Trying to get under the air and through it. Nebulous Theorem?
From what I understand, if you can't get a lot of air between bottom and the ground, it is best to none or almost none.
Please challenge me on this as all this aero stuff is new to me.
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robfrey
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« Reply #12 on: November 29, 2009, 01:47:29 PM »

down force  huh

Are you saying that it will make a lot of down force or are you asking me if it will and how much?
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SPARKY
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« Reply #13 on: November 29, 2009, 02:21:18 PM »

I was responding to the person who asked why you had a flat bottom---two reasons in my knowlege range---ease of construction and some down fore --- I am not second guessing you guys  by any means --I am no aero eng,---just a southern country boy who sold trucks grin!!!!!!!!!!!
« Last Edit: November 29, 2009, 07:49:46 PM by SPARKY » Logged

Miss LIBERTY,  changing TKI  to noise, dust and RUST!!!

The # 1 issue is: TO KEEP THE REPUBLIC      
   Center for Self Governance            tncsg.org     mrspowell.org

"Security is mostly a superstition. It does not exist in nature, nor do the children of men as a whole experience it. Avoiding danger is no safer in the long run than outright exposure. Life is either a daring adventure or nothing."   Helen Keller
robfrey
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« Reply #14 on: November 29, 2009, 02:37:49 PM »

As far as the Flat bottom thing goes, I certainly don't know myself. I was thinking that we try a couple of shapes in the virtual wind tunnel and see what works and what we could construct.
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