The question that keeps coming up
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
is largely similar to the book frame, but adds 4" of additional width throughout the length of the entire frame.
, same as a +4
frame in the width section, but also 4" longer and 2" taller.
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.