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Learning how to build Lotus Seven replicas...together!
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PostPosted: February 18, 2019, 10:32 am 
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Location: Warrenton, Virginia
Does anyone know what software was used to generate the McSorley plans.
I'm working with a friend to design a frame that uses MGB parts.
The frame size will be based on the original Series III frame with enhancements based on a Caterham 165. When we are done with the plans, a half dozen frames will be built. Plans include making the molds for the nose and fenders.
I want to post the frame planes, for anyone interested, formatted like the McSorley plans.
Free software if at all possible :) .
A few pictures for reference,a Cat 165;
Attachment:
042_caterham.jpg
042_caterham.jpg [ 170.61 KiB | Viewed 1420 times ]

Or this
Attachment:
1_seven.jpg
1_seven.jpg [ 106.61 KiB | Viewed 1420 times ]

Ron

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Last edited by STranger 7 on January 20, 2020, 11:20 am, edited 3 times in total.

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PostPosted: February 18, 2019, 1:05 pm 
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Joined: October 24, 2008, 2:13 pm
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Location: Carlsbad, California, USA
You could e-mail McSorley for the info on what he used, software-wise.

Depending on your skill level using complex software, and how serious you are about 3D design, I'd look at applying for a free, non-commercial license for Autodesk's Fusion 360.

More here ==> https://www.autodesk.com/products/fusion-360/free-trial

There is a significant learning cure for the product (there are a lot of on-line tutorials too), but you have absolutely everything you need available to you, plus some. When doing the molds for the body parts you will also have excellent surfacing tools whose data can be turned into practical output.

On the practical side, there are some MGB-based build logs here. I'd look through those for issues that came up, and how they were solved for those constructors. That could save you a lot of design time and/or rework at construction time.

Good luck. And don't forget to post your progress and results.

Cheers,

EDIT: I didn't recognize your new avatar, Ron. You've worked with SketchUp. It shouldn't be a big step up to Fusion 360.

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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 19, 2019, 5:37 pm 
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Lonnie,
I will check out the builds of those who have gone before me.
Looking at the Solid Edge 2d program for the plan drawings. It's free.
I just want to put together a pdf of drawings like McSorley did. Sketchup's 3d capabilities takes care of any other needs at this point.
Ron

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PostPosted: December 24, 2019, 5:31 pm 
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Lots of images gone. Adding this one for what it's worth.
Attachment:
CatConstrc,017,750w.jpg
CatConstrc,017,750w.jpg [ 222.49 KiB | Viewed 1631 times ]

Ron
From a series 1
Attachment:
lotus-7-series,1.jpg
lotus-7-series,1.jpg [ 125.89 KiB | Viewed 1552 times ]

Attachment:
lotus-7-series-2.jpg
lotus-7-series-2.jpg [ 148.07 KiB | Viewed 1552 times ]

Attachment:
lotus-7-series-3.jpg
lotus-7-series-3.jpg [ 110.71 KiB | Viewed 1552 times ]

Attachment:
lotus-7-series-4.jpg
lotus-7-series-4.jpg [ 120.16 KiB | Viewed 1552 times ]

Attachment:
1960 lotus 7 fifth link.jpg
1960 lotus 7 fifth link.jpg [ 129.46 KiB | Viewed 1482 times ]

Attachment:
1960 lotus 7 fifth link,2.jpg
1960 lotus 7 fifth link,2.jpg [ 146.62 KiB | Viewed 1482 times ]

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PostPosted: January 20, 2020, 10:49 am 
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For comparison. A series 2 on the left and a Caterham 165 on the right.
Attachment:
1963series2andcat165.jpg
1963series2andcat165.jpg [ 159.44 KiB | Viewed 1177 times ]

The Series 2 has a Kent crossflow 1600. the weight that the orig frame was supporting can be found here
http://westfield-world.com/engineandtransmission.html
Ron

Alright then. the 165 frame is easily found by Googling Caterham 165 in the images window.
the Prince (and other) series 2 frame drawings can be had here.
viewtopic.php?f=39&t=11691

Engines heaver than the Duratec will require stouter frames.

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PostPosted: January 20, 2020, 1:09 pm 
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Location: Cornholio OR "Where the magic happens"
Cody, Post some FEA screen shots?

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