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 Post subject: New mid engine chassis design and drawings
PostPosted: Sun Jul 22, 2012 7:49 pm 
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Joined: Sun Apr 08, 2012 11:25 am
Posts: 102
I have been working on drawing a new mid-engine based chassis. There is a 1 1/2" x 3" tubular subframe along with 1/4" plate for overall material use.

With the design I used a basic V8 engine and transaxle for layout purposes, along with a set of wheels fronts are 18x9, rears are 19x13

I have set the wheelbase at 110"
Body width at 72"


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 Post subject: Re: New mid engine chassis design and drawings
PostPosted: Mon Jul 23, 2012 8:42 am 
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Joined: Wed Feb 01, 2006 3:02 am
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1.5"x3" tube? 1/4" plate? !! That's battleship territory! Even in aluminium (yes, I spell it the way the whole rest of the world does :-) ) that's heading for overkill. Have you calculated the weight of this Sherman tank chassis?

Joking aside, using really heavy gauge plate is NOT the way to make stronger chassis.


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 Post subject: Re: New mid engine chassis design and drawings
PostPosted: Mon Jul 23, 2012 9:59 am 
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Joined: Tue Dec 19, 2006 11:02 pm
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Location: Willingboro, NJ
Fun stuff and fast-study on the CAD! I'd suggest getting the suspension geometry going now that you have a rough idea of the chassis size. That way you won't spend too much time refining something that may change. You'll also find it helpful to place a driver in the model.

Yeah, I'd think that .060" sheet would be best for sheathing the frame. I haven't paid much attention to best practice semi-monocoque design details, though, so hopefully someone in the know will chime in with a good number. Are you planning on a welded aluminum(ium) frame and riveted panels?

Pete


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 Post subject: Re: New mid engine chassis design and drawings
PostPosted: Mon Jul 23, 2012 10:49 am 
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OzGecko wrote:
1.5"x3" tube? 1/4" plate? !!


Lives in the 'Hood and works nightshift at 7/11.


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 Post subject: Re: New mid engine chassis design and drawings
PostPosted: Mon Jul 23, 2012 11:07 am 
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Location: Tallahassee, FL (The Center of the Known Universe)
Yo, Evrybody-
1.5 X 3 tubing is fairly common for the "ladder" type frames found in street rods, and in older production automobiles. While it seems like massive overkill to all of us "space frame-lightweight-Se7en" minded people, it's not really an odditiy (in the US anyway) for frame rails.

1/4 thick plate, however, sounds a bit much... Steel? Aluminum-ium maybe...

:cheers:

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 Post subject: Re: New mid engine chassis design and drawings
PostPosted: Mon Jul 23, 2012 11:35 am 
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Location: Oregon, usually
Shooting from horseback here...floor pan 6 x 8 (averaging the notches and extensions) plus 50% for the vertical surfaces...at 1/4" that's 1-1/2 cubic feet, about 750 pounds of steel in the plate alone. Heavy, yes, but you'll fear no IED.

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 Post subject: Re: New mid engine chassis design and drawings
PostPosted: Mon Jul 23, 2012 11:45 am 
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GonzoRacer wrote:
Yo, Everybody - 1.5 X 3 tubing


Nothing wrong with a basic 2 run ladder frame or better still, an 'X' frame from 1.5 x 3, which well designed can give a spaceframe a run for the dough but based on the runs in the 3D above with the 1/4" plate, OzGecko's "Sherman Tank" comment stands up!


GonzoRacer wrote:
Yo, Evrybody-


1/4 thick plate, however, sounds a bit much... Aluminum-ium maybe...



1/8 max for "ala - min - ee - um" (not "aloooon - nah - mum"!).


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 Post subject: Re: New mid engine chassis design and drawings
PostPosted: Sat Jul 28, 2012 4:07 pm 
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Joined: Tue Sep 05, 2006 11:00 pm
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Location: Columbia SC
I was thinking USS Missouri.... just need some wood barge boards to protect from torpedoes. That's heavier construction than a Humvee. Think light.
Great you are starting a design but, read some chassis design books and look at frames of typical(similar) race cars. Something like a Can Am car. Stiffness and strength
come from careful design and materials selection. Not overly thick materials.

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 Post subject: Re: New mid engine chassis design and drawings
PostPosted: Tue Aug 28, 2012 5:26 pm 
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Joined: Sun Nov 13, 2005 9:16 pm
Posts: 72
Location: Scottsdale AZ
have you ever worked with 1/4 in plate?, I could get a sheet put into my truck but then I would have no way to get it off! and then how would you cut it?

read up on Colin Chapman, not off road rock crawler books.

Add Lightness

Remember Acceleration = Force x Mass, you are stuck with natural laws


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 Post subject: Re: New mid engine chassis design and drawings
PostPosted: Tue Aug 28, 2012 9:31 pm 
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Mid-Engined Maniac

Joined: Sun Apr 23, 2006 8:26 pm
Posts: 4494
Location: SoCal
John Se wrote:
...Remember Acceleration = Force x Mass...

Close... Per your equation, if he cuts his mass in half he'll acceleration half as fast... It's actually F = MA :)

In any case, you're right about the weight - the OP needs to do more reading. While you can make a chassis with 1/4" plate, having a dead stock Miata get a faster laptime would be a real downer. It's all about less weight, so the armor plating is out.

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 Post subject: Re: New mid engine chassis design and drawings
PostPosted: Thu Aug 30, 2012 3:38 pm 
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Joined: Sun Nov 13, 2005 9:16 pm
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Location: Scottsdale AZ
I guess I did get that incorrect:

We can manipulate the formula (F =ma) to work out the mass or the acceleration of the Vehicle.
a = f/m
or
m = f/a

"Add Lightness"


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 Post subject: Re: New mid engine chassis design and drawings
PostPosted: Thu Aug 30, 2012 3:39 pm 
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Joined: Sun Nov 13, 2005 9:16 pm
Posts: 72
Location: Scottsdale AZ
JackMcCornack wrote:
Heavy, yes, but you'll fear no IED.



thats funny :cheers:


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