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Author Topic: XXO/BVGC '38 Chevy Coupe Build  (Read 1031826 times)

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Offline krusty

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Re: XXO/BVGC '38 Chevy Coupe Build
« Reply #1680 on: April 09, 2013, 02:49:20 PM »
     Buddy - Does that biga** spoiler have some way to relieve the pressure buildup if the car spins? I have put a car with a similar spoiler in the A2 windtunnel BACKWARDS and it  developed some significant lift with the back end facing forward. (Think of going backwards towards Floating Mountain). Either hinged at the connection to the body or a couple of simple flaps in the spoiler surface (flaps are kept down by the air moving over them but open when it comes from below). Similar to the cowl (NOT roof) flaps on a NASCAR Cup car.     vic

     Edit: I went back and looked at the pics again. I don't think  it will generate as much lift as I saw on the car we had in the tunnel, which had much more surface area hanging behind the bodywork. Still best to be prepared, IMHO. The 325 TO ex-Dale Jr. Busch car spun last year and the spoiler ripped the deck lid off (still had the  NASCAR mandated tethers, though).
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Offline WZ JUNK

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Re: XXO/BVGC '38 Chevy Coupe Build
« Reply #1681 on: April 09, 2013, 03:35:34 PM »
Quote from: krusty on April 09, 2013, 02:49:20 PM
     Buddy - Does that biga** spoiler have some way to relieve the pressure buildup if the car spins? I have put a car with a similar spoiler in the A2 windtunnel BACKWARDS and it  developed some significant lift with the back end facing forward. (Think of going backwards towards Floating Mountain). Either hinged at the connection to the body or a couple of simple flaps in the spoiler surface (flaps are kept down by the air moving over them but open when it comes from below). Similar to the cowl (NOT roof) flaps on a NASCAR Cup car.     vic

     Edit: I went back and looked at the pics again. I don't think  it will generate as much lift as I saw on the car we had in the tunnel, which had much more surface area hanging behind the bodywork. Still best to be prepared, IMHO. The 325 TO ex-Dale Jr. Busch car spun last year and the spoiler ripped the deck lid off (still had the  NASCAR mandated tethers, though).

Actually it may seperate from the car, if the car turns backwards.  In my opinion that would be better than it trying to lift the rear of the car.  I had that in mind when I designed the way the spoiler is fastened to the car.   It is attached  to hold a load from the top and the front but will tear away if the load is from behind.  We are in a gray area here but all you can do is go with what seems to be right.

Hopefully the big spill plates will act like rudders and keep it from spinning.

We are in the middle of a redo of the spoiler today.

John
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Offline 38flattie

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Re: XXO/BVGC '38 Chevy Coupe Build
« Reply #1682 on: April 10, 2013, 05:48:35 PM »
Additional braces are on, and the area between the spill plates and body are filled, per the rules.
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With sufficient thrust, pigs fly just fine. However, this is not necessarily a good idea. It is hard to be sure where they are going to land, and it could be dangerous sitting under them as they fly overhead. -- RFC 1925

You can't make a race horse out of a pig. But if you work hard enough at it you can make a mighty fast pig. - Bob Akin

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Offline Roseville Carl

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Re: XXO/BVGC '38 Chevy Coupe Build
« Reply #1683 on: April 10, 2013, 11:01:40 PM »
It is still amazing to me on how this has developed from day one, a simple Cad flathead build, and where its going now, great job Guys!!!!!
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Offline Rex Schimmer

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Re: XXO/BVGC '38 Chevy Coupe Build
« Reply #1684 on: April 11, 2013, 10:50:46 AM »
Carl you are so right!! If this isn't the biggest case of "mission creep" I don't know what is!

And it is, and has been, so much fun to watch, thanks Buddy and crew!!

Rex
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Offline Tman

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Re: XXO/BVGC '38 Chevy Coupe Build
« Reply #1685 on: April 11, 2013, 10:52:55 AM »
Quote from: Rex Schimmer on April 11, 2013, 10:50:46 AM
Carl you are so right!! If this isn't the biggest case of "mission creep" I don't know what is!

And it is, and has been, so much fun to watch, thanks Buddy and crew!!

Rex

Reminds me of the guy that bought a bronze prop at a yardsale then built a ship around it!~
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Offline Stainless1

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Re: XXO/BVGC '38 Chevy Coupe Build
« Reply #1686 on: April 11, 2013, 03:46:52 PM »
They just have that speed addiction thing... and that always leads to "project creep"  They just need to attend a couple of meetings and things will get better.... first meeting for addicts on the salt is in August....

Hi, my name is Stainless and I am a landspeed addict....
Hi, my name is Buddy and I am a landspeed addict....
Hi, my name is  (your name here) and I am a landspeed addict....
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Offline 38flattie

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Re: XXO/BVGC '38 Chevy Coupe Build
« Reply #1687 on: April 12, 2013, 12:58:19 PM »
Haha! I'm not sure 12 steps will cure what we have!


Don has been busy perfecting the lifters. Dema signed off on them, so we are now ready to go to production!

From Don: 

first pic-- oil grove and oil hole to hollow center

# 2  drilled the length of lifter to cross oil hole

# 3,4,5,6  crossed drilled one side only to feed roller bearings on wheel  I will plug weld non needed holes

# 7,8,9ect bored 1/2" diam hole x 1-1/2" deep in body made a top insert ( will change to a flanged insert ) to press in the body and tac weld at assy

 also the flats are .040 deep on each side
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With sufficient thrust, pigs fly just fine. However, this is not necessarily a good idea. It is hard to be sure where they are going to land, and it could be dangerous sitting under them as they fly overhead. -- RFC 1925

You can't make a race horse out of a pig. But if you work hard enough at it you can make a mighty fast pig. - Bob Akin

http://www.flatcadracing.org/
http://youtu.be/89rVb497_4c

Offline 38flattie

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Re: XXO/BVGC '38 Chevy Coupe Build
« Reply #1688 on: April 12, 2013, 01:03:26 PM »
...and a few more pics.
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With sufficient thrust, pigs fly just fine. However, this is not necessarily a good idea. It is hard to be sure where they are going to land, and it could be dangerous sitting under them as they fly overhead. -- RFC 1925

You can't make a race horse out of a pig. But if you work hard enough at it you can make a mighty fast pig. - Bob Akin

http://www.flatcadracing.org/
http://youtu.be/89rVb497_4c

Offline Tman

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Re: XXO/BVGC '38 Chevy Coupe Build
« Reply #1689 on: April 12, 2013, 01:13:27 PM »
I don't think the #2 pencil makes a very good engine component but the rest of the stuff looks nice!
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Offline Jack Gifford

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Re: XXO/BVGC '38 Chevy Coupe Build
« Reply #1690 on: April 13, 2013, 12:58:43 AM »
What hardness will the lifter bodies be heat-treated to? (I think you said they are 10xx mild steel?). Surface-smoothing before or after heat-treat?
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Offline pops29

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Re: XXO/BVGC '38 Chevy Coupe Build
« Reply #1691 on: April 13, 2013, 10:24:29 AM »

  The materials we will use has changed -- Because of the mods to the lifters we now will use  8620  heat treated
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Offline pops29

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Re: XXO/BVGC '38 Chevy Coupe Build
« Reply #1692 on: April 13, 2013, 10:26:09 AM »


  The heat treatment will go to 50-55 rc and ground finish
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Offline 38flattie

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Re: XXO/BVGC '38 Chevy Coupe Build
« Reply #1693 on: April 13, 2013, 11:24:39 AM »
The cam is done, so I thought I'd share the cam info.
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With sufficient thrust, pigs fly just fine. However, this is not necessarily a good idea. It is hard to be sure where they are going to land, and it could be dangerous sitting under them as they fly overhead. -- RFC 1925

You can't make a race horse out of a pig. But if you work hard enough at it you can make a mighty fast pig. - Bob Akin

http://www.flatcadracing.org/
http://youtu.be/89rVb497_4c

Offline 38flattie

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Re: XXO/BVGC '38 Chevy Coupe Build
« Reply #1694 on: April 13, 2013, 11:29:37 AM »
...a little more info.
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With sufficient thrust, pigs fly just fine. However, this is not necessarily a good idea. It is hard to be sure where they are going to land, and it could be dangerous sitting under them as they fly overhead. -- RFC 1925

You can't make a race horse out of a pig. But if you work hard enough at it you can make a mighty fast pig. - Bob Akin

http://www.flatcadracing.org/
http://youtu.be/89rVb497_4c
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