MK IV tubular spaceframe drawing

[H.J.Bayer]

Nice thread to follow, note that Jac has not commented on the engine shown since you stuck a Ford in your drawings.
What country are you in? Your English is improving nicely as this thread moves along

Thank's for the compliment.
I live in Bavaria / Germany. Scratch building provides many challenges.
But honestly - Deepl.com is my friend
And you see Jac is back

 

[H.J.Bayer]

I can't determine from the drawing- is the LBJ a heim joint? If it's loaded with spring force, are you concerned with its integrity?

I work with parts from Hirschmann Germany - there are many parts especially for racing applications - unfortunately very expensive

Carl Hirschmanns GT Koffer | Carl Hirschmann GmbH

www.carlhirschmann.de

 

[H.J.Bayer]

You need more headroom. With the new helmets especially, you will be solidly up against the roof/roll cage structure. Not good.

Neil I have done a lot to get more space, but at some point you reach the limit. I extended the frame forward and moved the roll bar back as far as it would go.
All to get a more reclined position for more headroom.
My wife Britta says I should rather plan with the michelin man....

 

[Neil]

Those are very nice CAD drawings. It looks to me as if you might be able to roll the top part of the 'cage rear hoop backwards 20-30 degrees to give you more space behind your head- space for a big helmet, HANS, etc. Driving with your neck bent forward and your helmet rattling off the rear bulkhead is not pleasant.

 

[H.J.Bayer]

I already had this idea, too.
At the moment, the roll bar sits half under the Spider and half under the hood. If I put the roll bar at an angle, I have no support for the spider.

 

[H.J.Bayer]

Hi - can someone maybe help me?
I am completely confused right now.
I have entered my chassis data into the Syspensions Analyzer, so far everything works.
Now I have set static 20% AntiDive, that also works .
But if I compress the chassis 60 mm, then I get logical values for the left side (i think) , but for the right side something completely unrealistic is displayed.
Does anyone know what I'm doing wrong?
I have attached the data.

 

[Neil]

Rex, the camber gain & caster gain values are given L-R as mirror image. Is that the confusion?

 

[H.J.Bayer]

Neil - I don't think so, only the camber is an input field,
the caster comes from the geometry.
For the static camber, I entered -1.5° on both sides so that both wheels point inward at the top.
Or do I understand you wrong?
It is very troublesome to work with the program, every time I open the file, half of the input data is missing again.
Unfortunately, I also get no answer when I ask the developer

 

[Paul Hendrickx]

Hello,
did you try these one out?

racing aspirations

Hello [user] and welcome to racingaspirations.com – the home of some of the best visual motorsport calculators I believe you will find on the internet and all available to try for as long as you like free of charge. I use these calculators to develop my own car and you can follow my progress as […]

www.racingaspirations.com

found them helpful to make my suspension compromise decisions
Paul

 

[Neil]

Neil - I don't think so, only the camber is an input field,
the caster comes from the geometry.
For the static camber, I entered -1.5° on both sides so that both wheels point inward at the top.
Or do I understand you wrong?
It is very troublesome to work with the program, every time I open the file, half of the input data is missing again.
Unfortunately, I also get no answer when I ask the developer

I used that software (but maybe a different version) to design my suspension and I had no problems with it. My rear suspension is a 5-link type and the front is the common Mustang II a-arm setup.

 

[Jac Mac]

I used that software (but maybe a different version) to design my suspension and I had no problems with it. My rear suspension is a 5-link type and the front is the common Mustang II a-arm setup.

This helps if your having software problems with suspension design.

 

[Neil]

Does that work on a Windows PC or a Mac?

 

[Jac Mac]

Does that work on a Windows PC or a Mac?

Works fine for this MAC, no Apples required.

 

[H.J.Bayer]

Works fine for this MAC, no Apples required.

Back to the roots

 

[Brian Coombs]

This helps if your having software problems with suspension design.

Ah, Alan Staniforth! his sting computer has been used to design a lot of successful cars

 

[H.J.Bayer]

Hmm - what can I say, I feel younger and younger right now...

 

[H.J.Bayer]

Hello,
did you try these one out?

racing aspirations

Hello [user] and welcome to racingaspirations.com – the home of some of the best visual motorsport calculators I believe you will find on the internet and all available to try for as long as you like free of charge. I use these calculators to develop my own car and you can follow my progress as […]

www.racingaspirations.com

found them helpful to make my suspension compromise decisions
Paul

Thanks for the tip, I know the webseit.
Unfortunately, you can not work out anti-dive, anti-squat

 

[H.J.Bayer]

Can someone tell me approximately how high the center of gravity is on the Gt40?

 

[Trevor]

Obviously, it depends on many things, including placement of main components, ride height, etc, but for my specific case; 4.5 inch front ride height and 5 in rear ride height with bottom of engine sump in line with plane of chassis bottom (no dry sump) then
front CoG: rear CoG

29.25​

cm

42.8​

cm

I did it the hard way by weighing/estimating most of the major components and calculating mass centres over the axle axes

 

[H.J.Bayer]

Hi Trevor, Thank you very much!! So far I have calculated with 34 cm (estimated). That must have been a lot of work - thanks for releasing the info. It helps me a lot!