Simon
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| posted on 4/11/07 at 07:10 PM |
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Why "Y"'s for the engine mounting tubes, when straight pieces are the norm.
In the time this drawing had taken, I think I was in the process of starting my bodywork - scratchbuilt chassis, and bodywork.
Tell him to throw away his computer and start building
ATB
Simon
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D Beddows
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| posted on 4/11/07 at 09:51 PM |
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It's how Caterham do/did them and that's the point of the exercise I believe......although I'm not sure there's actually a
practical exercise going on here 
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Tralfaz
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| posted on 5/11/07 at 12:09 AM |
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IIRC The Y's were created to give clearance for the bell housing, as the Caterham is 4 inches narrower than a Locost frame.
[Edited on 5/11/07 by Tralfaz]
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Simon
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| posted on 6/11/07 at 08:38 PM |
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4" narrower than standard book chassis??? Mines 4" wider than book. God, it'd be tight in a Caterham
ATB
Simon
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scudracer
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| posted on 2/12/07 at 03:49 AM |
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- Frame drawing almost complete
- Ford product manager is donating his fathers '79 Escort Ghia 1.6-litre
- FRP wings to be completed by next week
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scudracer
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| posted on 5/12/07 at 11:02 PM |
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Here's how it looks as of yesterday. Need to add in dash hoop, suspension brackets. Otherwise ... I think we can start cutting metal now.
Shameless-ad-supported-blog-that-belongs-to-my-friend plug - http://www.sevenbuilder.com & http://www.bikervoodoo.com
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Echidna
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| posted on 6/12/07 at 05:26 AM |
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The next step of to analyse it with FEA software, right?
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NOTE:This user is registered as a LocostBuilders trader and may offer commercial services to other users
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scudracer
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| posted on 9/12/07 at 11:41 PM |
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Next step is to add in suspension brackets, tabs for dzus fasteners, gussets, etc. Would be good to have FEA done but not sure if 'Mr.
Lotus' who's drawing the frame in SolidWorks 3D has access to CosmosWorks.
[Edited on 9/12/07 by scudracer]
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scudracer
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| posted on 21/12/07 at 11:15 PM |
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Gussets & Chassis Reinforcement
Have been thinking about chassis reinforcement. A good bulletin to read would be "Lotus Seven Chassis Reinforcement" issued by DSK Cars,
Dec 13, 1978. It's posted on Simplesevens.org I believe. Also, I've been reading "The Racing Motorcycle" by John Bradley.
There is a nice picture of a subframe there by SDW Light Fabrications.
 Link to their website can be found below.
Apparently the subframe tubing is a mix of 16, 18 and 20 swg material, with the gussets being 20 swg. These are better than the thick plate gussets
illustrated in "Sports Car Chassis Design" by Mike Costin/Phipps because stiffness increases gradually (according to John Bradley's
book). The ends and corner of the gusset are left unwelded. The work continues
...http://www.sdwlightfabrications.co.uk/
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Joe T
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| posted on 26/1/08 at 01:12 PM |
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quote:
These are better than the thick plate gussets illustrated in "Sports Car Chassis Design" by Mike Costin/Phipps because stiffness
increases gradually (according to John Bradley's book). The ends and corner of the gusset are left unwelded.
This is interesting, is there a weight advantage?
I also wondered why the ends are left unwelded, is this to reduce stress in the joint area?
Cheers
Joe T
Costin Roadster Project
Work in progress
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scudracer
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| posted on 26/7/08 at 02:22 AM |
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Joe - yes I think so. The use of gussets will make the chassis stiff but the thing is they've got to be in the right place. No CosmosWorks so no
FEA. Guess we'll have to do it old school style? 
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