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Learning how to build Lotus Seven replicas...together!
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PostPosted: February 4, 2014, 3:08 pm 
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Location: Warrenton, Virginia
Does anyone have any first person experience with this style seat?
Attachment:
$(KGrHqN,!qUFI,VsbzydBSKy5H(0fQ~~60_12.JPG
$(KGrHqN,!qUFI,VsbzydBSKy5H(0fQ~~60_12.JPG [ 276.88 KiB | Viewed 5942 times ]


Ron

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PostPosted: February 4, 2014, 3:51 pm 
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I drove my friends Caterham with those seats. They are certainly more comfortable than the Kirkey or SafeRacer seats many of us are using. On the other hand, I like that little extra metal between me and that SUV trying to T-Bone me that racing seats provide. Doubt it would save me, but it does make me feel better.

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PostPosted: February 4, 2014, 4:36 pm 
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JPS Europa,

You're right about there not being much to these.
Attachment:
DSCF3684.jpg
DSCF3684.jpg [ 262.38 KiB | Viewed 5925 times ]

Attachment:
seat04b.jpg
seat04b.jpg [ 321.97 KiB | Viewed 5925 times ]


But would they be comfortable after say 6 hrs on the road?

Ron

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PostPosted: February 4, 2014, 6:31 pm 
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I think what would make the comfortable is the great leg support. I plan on adding some padding to my Kirkey seat ho much who knows, just enough to make it comfy I guess.

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PostPosted: February 4, 2014, 7:37 pm 
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They'd be comfortable if they actually fit you. I love my fiero seats but an early miata seat has my back hurting in 30 minutes. I found cutting the bottom foam and removing the pad in the center of the back worked wonders.

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PostPosted: February 5, 2014, 10:28 am 
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Location: Warrenton, Virginia
Miatav8,
From what I can tell these seats work best for skinny people!
My 1994 Honda Accord seats are a good fit when my weight is 165 lbs or less. When I'm at 180lbs, I have a very hard time getting comfortable. The padding in the seats lumbar support is to much for the additional body mass. The plan has always been to be 155 lbs to 160 lbs by the time the 7 is ready to drive.

If someone were to build these themselves, the foam in that area could be sized to fit.
This site details the rebuild of the back section.
http://website.lineone.net/~dmch2/seats.htm
This pic shows how the lumbar foam piece is fitted to the back panel.
Attachment:
seat11.jpg
seat11.jpg [ 302.93 KiB | Viewed 5860 times ]

I believe the original foam is being reused.
Anyway... as I figure out measurements and methods, they will be posted here.
The plan is to develop plans for the seats, the forms to use to bend the tubing, and patterns for the upholstery, that are easily "Tweak-able" to fit individual needs.
...And will comfortable for "the long haul".
:o FYI
The folks on this site drive their Caterham year round. They have the same style seats! :)
http://www.mycaterham.com/15083/index.html?*session*id*key*=*session*id*val*
This page in particular brings a big smile :D
http://www.mycaterham.com/117516/162193.html

Just sayin,

Ron

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PostPosted: February 5, 2014, 12:00 pm 
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Joined: October 24, 2008, 2:13 pm
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Location: Carlsbad, California, USA
STranger 7 wrote:
Miatav8,
From what I can tell these seats work best for skinny people! My 1994 Honda Accord seats are a good fit when my weight is 165 lbs or less. When I'm at 180lbs, I have a very hard time getting comfortable. . . . <SNIP> . . . The plan has always been to be 155 lbs to 160 lbs by the time the 7 is ready to drive.

. . . <SNIP> . . .

Anyway... as I figure out measurements and methods, they will be posted here. The plan is to develop plans for the seats, the forms to use to bend the tubing, and patterns for the upholstery, that are easily "Tweak-able" to fit individual needs.

Ron


Uh, Ron, my own experience tells me that 155 is not the most realistic goal for gentlemen of our ages. I wish you the best, but hope you don't beat yourself up with that one. :wink:

On the plus side, I have an excellent ergonomic technical reference that I can share with you. It's a 3MB, electronic copy of a extensive paper from the University of Michigan Transportation Research Institute that covers pretty much all areas of auto seating and summarizes past research results. Best of all, it gives very specific ranges of dimensions for all aspects of seating and the trade-offs between various factors. It is long and technical, so takes some effort, but is info packed. PM me with your e-mail address if you'd like it.

You might also want Google the H-Point concept if you're not familiar with it. Try searching in the images portion as well as the web section.

I applaud your efforts. I may design my own seats too because I don't find many ready-mades comfortable and my wife has some special needs I'd like to satisfy, so she'll enjoy the Locost too. Do publish your efforts and results.

Best,

Lonnie

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Damn! That front slip angle is way too large and the Ackerman is just a muddle.

Build Log: viewtopic.php?f=35&t=5886


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PostPosted: February 5, 2014, 2:18 pm 
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Location: Warrenton, Virginia
Lonnie,
PM sent!

I'm more trying to make that design my own. meaning, adapt it to fit my person and the space available. It may end up looking just like it, won't know until I can sit in a mock-up.
I'll start with as close to an original copy as I can manage and then work from there.
The frame sitting on 6" tiles gives some idea of the measurements.
The seat is almost level with the rear bulkhead in height,
Attachment:
headrest Profile02b.jpg
headrest Profile02b.jpg [ 23.81 KiB | Viewed 5836 times ]

I'm taking the frame height measurement and the rear bulkhead angle from a SketchUp Model of a Caterham frame.
Attachment:
First side view sketch.jpg
First side view sketch.jpg [ 124.43 KiB | Viewed 5836 times ]

When I gather more info I'll attempt a SketchUp model.

Ron

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PostPosted: February 7, 2014, 6:03 pm 
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Location: Warrenton, Virginia
After looking at a large collection of images, I think I'm close to having a height for the replica seat.
Some pictures show top of the seat backs (w/o headrest) level with the rear bulkhead, while others show it sitting above!
This appears to be the reason why.
Attachment:
Pan,noPan.jpg
Pan,noPan.jpg [ 123.46 KiB | Viewed 5781 times ]

Some models have a dropped floor (green Cat) that results in the seat back level with the bulkhead.
The seat pan is about 2" below frame bottom.
Attachment:
Pan,Pan.jpg
Pan,Pan.jpg [ 118.13 KiB | Viewed 5781 times ]

If a rail assembly adds 1" the seat height should be in the neighborhood of 1" taller than the distance from the bottom of the frame to the top at the rear bulkhead.
This SketchUp drawing is of the smaller ,current Caterham fame,
Attachment:
SmCatFrameHeight.jpg
SmCatFrameHeight.jpg [ 111.84 KiB | Viewed 5781 times ]

Using that measurement, and approx. values taken from the frame on the tiles pic This sketch was assembled.
Attachment:
SeatHeights01.jpg
SeatHeights01.jpg [ 86.6 KiB | Viewed 5781 times ]

Then, because The STRanger 7 height was increased to match the skuttle height needed for the Cologne V6, 1 3/8" was added.

The first dimensioned SketchUp drawing will be of 14" wide, 21 5/8" tall replica/copy. The drawing for mine will be 16" wide and 23" tall.

Not altogether unlike the difference between the Cat Roadsport ,and the Roadsport SV size.
Attachment:
Roadsport,RSSV.jpg
Roadsport,RSSV.jpg [ 376.6 KiB | Viewed 5781 times ]


All for now,

Ron
181.2

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PostPosted: February 7, 2014, 10:10 pm 
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Not quite Caterham seats...But definitely DIY'able.
http://www.locostusa.com/forums/viewtopic.php?f=22&t=8877

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PostPosted: February 8, 2014, 12:13 pm 
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Location: Warrenton, Virginia
Driven5,
Both seats are great options for home made solutions.
The step by step details provide excellent insight into the techniques used.
How about that Locost style space frame inside the Spridget body shell! Looks right at home.

Ron

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PostPosted: February 10, 2014, 5:46 pm 
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To date:
First model was a little off compared to the picture,
Attachment:
ToLong01.jpg
ToLong01.jpg [ 185.01 KiB | Viewed 5667 times ]

Attachment:
seat04,45R.jpg
seat04,45R.jpg [ 110.1 KiB | Viewed 5667 times ]

To long and the dia. for the back bottom curve was to small.

This last one is closer.
Attachment:
FirstModelof14inch.jpg
FirstModelof14inch.jpg [ 116.95 KiB | Viewed 5667 times ]


A few tweaks here and there and it can be uploaded to the SketchUp warehouse.
The dimensions for the headrest receiver were taken from a MGB unit.

All for now.

Ron
180.2

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PostPosted: February 11, 2014, 3:43 pm 
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Location: Carlsbad, California, USA
Ron,

What are you going to use to bend the tubes?

Looks goo by the way.

Cheers,

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Damn! That front slip angle is way too large and the Ackerman is just a muddle.

Build Log: viewtopic.php?f=35&t=5886


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PostPosted: February 11, 2014, 8:08 pm 
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Location: Warrenton, Virginia
Lonnie,
Using plywood forms,
Attachment:
basicForm.jpg
basicForm.jpg [ 17.56 KiB | Viewed 5612 times ]

Take a 1/4" round router bit to 2 matching pieces.
Because of spring-back two forms for each curve.
The under size form to make a curve just a little to small and a full sized form
so I can take a rubber mallet and tap it out to the correct size.

With the tube securely clamped at the top of the curve,
Attachment:
basicFormSm.jpg
basicFormSm.jpg [ 29.22 KiB | Viewed 5612 times ]

I'll clamp the form in a vice and bend away.
The 1/2" tubes will be packed with oven dried fine playground sand.

I'm guessing heat will be necessary for the bends at the top of the side tubes,
Attachment:
TightCorners.jpg
TightCorners.jpg [ 101.55 KiB | Viewed 5612 times ]

and along with heat the rear corners, where the back curve meets the right and left horz. tube, will need to be indented.
This is the finished 14" wide model
Attachment:
finished14inch.jpg
finished14inch.jpg [ 88.95 KiB | Viewed 5612 times ]

I'm in the process of learning how to upload models to the SketchUp Warehouse :?
I'll provide a link if I can.

This is 2 15" wide seat "place holders" in my frame model
Attachment:
TopPlacement01.jpg
TopPlacement01.jpg [ 119.43 KiB | Viewed 5612 times ]

Attachment:
FrontClearanceIssue.jpg
FrontClearanceIssue.jpg [ 109.29 KiB | Viewed 5612 times ]



Tight in front at the sides but I can make them fit. :wink:

Ron

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PostPosted: February 12, 2014, 12:57 pm 
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Location: Warrenton, Virginia
Here is a link to the" SketchUp 8 " model of the 14" wide seat.
http://sketchup.google.com/3dwarehouse/details?mid=f241052482435234a6e628a50277d033&prevstart=0
I'll post the dimensions here or the can by taken from the model.
Here are a few images.
Attachment:
14,CenterLine 4SideCurve.jpg
14,CenterLine 4SideCurve.jpg [ 91.41 KiB | Viewed 5593 times ]

Attachment:
14,CenterLine Layout4Side.jpg
14,CenterLine Layout4Side.jpg [ 73 KiB | Viewed 5593 times ]

Attachment:
14,Sides of bottom,01.jpg
14,Sides of bottom,01.jpg [ 87.2 KiB | Viewed 5593 times ]


More to come! I have a few things to do before the storm hits :shock:

Questions?...

Ron

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