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Frame sizes explained - what do +4, book or 442E mean?
http://locostusa.com/forums/viewtopic.php?f=42&t=6561
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Author:  Blackbird [ April 16, 2009, 1:11 am ]
Post subject:  Frame sizes explained - what do +4, book or 442E mean?

The question that keeps coming up :wink:

If you're new to the Locost scene, you'll find out pretty quickly that there are a few different sizes of frames that most people end up building -

1. The original Locost frame from the Ron Champion book got the nick name "book frame" or sometimes just "book".

Referring to the book frame as the basis, there are a few variations of it -(drawings for these frames are available courtesy of Jim McSorley's website)

2. +4 is largely similar to the book frame, but adds 4" of additional width throughout the length of the entire frame.

3. +442E, same as a +4 frame in the width section, but also 4" longer and 2" taller.

4. +442 is 4" longer and 2" taller, just like the +442E, but the difference is that the 4" of additional width are only in the passenger compartment and not in the engine bay.

The next frame is from the new book written by Chris Gibbs.
Since the rights for the name "Locost" belong to Ron Champion, Haynes (the publisher) changed the name of the car to "Haynes Roadster".

5. Haynes roadster frame, which is a +221 when compared to the book frame.

Which one fits you? See: viewtopic.php?f=42&t=4226


A good thing to remember -
All of the above frames (including the book) are bigger than the original Lotus 7 S2 frame by a good margin.

Another good thing to remember -
While there are fully detailed plans for each one of the above frames, many scratch builders are building their frames with different sizes to suit their plans better.
A +7 length or +431 are not unheard of, and if I use my own frame as an example than I'm building a +0/40mm/0, with the 40mm additional width only in the passenger compartment to accomodate my racing seats.



HTH,

Moti

Author:  Scrubbles [ April 17, 2009, 12:30 pm ]
Post subject:  Re: Frame sizes explained - what do +4, book or 442E mean?

The 442e plans are not linked to from McSorlys plan page, so here it is..
http://mcsorley.net/locost/drawings/McSorley7+442e.pdf


There is a +241 plan by some other guy, but i cant find a link :|

Author:  Borz [ April 19, 2009, 10:12 am ]
Post subject:  Re: Frame sizes explained - what do +4, book or 442E mean?

i, and probably others, am greatly interested in seeing actual schematics of a 7, s2 chassis, as well as dimensions, and likewise with any current frames available from caterham or other manufacturers. A more dimensionally correct car, is what appeals to me, and finding said dimensions is proving somewhat difficult, so if anyone's got em, or just pictures of bare s2, or current/recent frames please post them up.

Author:  Blackbird [ April 19, 2009, 1:11 pm ]
Post subject:  Re: Frame sizes explained - what do +4, book or 442E mean?

Here's what I have.
It has been posted up in the forum before.

Moti

Attachments:
File comment: S2 Seven
Lotus7S2.gif
Lotus7S2.gif [ 33.1 KiB | Viewed 11747 times ]

Author:  chetcpo [ April 20, 2009, 8:48 am ]
Post subject:  Re: Frame sizes explained - what do +4, book or 442E mean?

Borz wrote:
i, and probably others, am greatly interested in seeing actual schematics of a 7, s2 chassis, as well as dimensions, and likewise with any current frames available from caterham or other manufacturers. A more dimensionally correct car, is what appeals to me, and finding said dimensions is proving somewhat difficult, so if anyone's got em, or just pictures of bare s2, or current/recent frames please post them up.


If you do some digging there is a member here who is selling blueprints for a reproduction Seven chassis for $75 a pop. Don't remeber his handle right off the bat.

*EDIT* Found him>>> He goes by KYO

Author:  90GT [ August 8, 2010, 10:36 am ]
Post subject:  Re: Frame sizes explained - what do +4, book or 442E mean?

I was forwarded to KYO's website and the Lotus 7 S2 drawings can be found here:

http://www.patiencecorner.org/Lotus%20S ... 0dbcaccdec

Author:  mistanfo [ June 2, 2011, 10:20 pm ]
Post subject:  Re: Frame sizes explained - what do +4, book or 442E mean?

Above link is dead.

Author:  skou [ June 3, 2011, 12:36 am ]
Post subject:  Re: Frame sizes explained - what do +4, book or 442E mean?

mistanfo wrote:
Above link is dead.

This is his new site http://www.diyse7ens.com.

Author:  7thhvn [ December 21, 2011, 9:20 pm ]
Post subject:  Re: Frame sizes explained - what do +4, book or 442E mean?

This link is also dead


skou wrote:
mistanfo wrote:
Above link is dead.

This is his new site http://www.diyse7ens.com.

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