Today's Message Index:
----------------------
1. 05:12 AM - Re: The Obsidian File - Mono Undercarriage (Area-51)
2. 05:38 AM - The Obsidian Files - Undercarriage - The Scotland Directive (Area-51)
3. 05:59 AM - Re: The Obsidian Files - Undercarriage - The Scotland Directive (Pete Zut)
4. 05:59 AM - Re: The Obsidian Files - Undercarriage - The Scotland Directive (Pete Zut)
5. 06:38 AM - Re: The Obsidian Files - Undercarriage - The Scotland Directive (Area-51)
Message 1
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| Subject: | Re: The Obsidian File - Mono Undercarriage |
An additional image explaining the "over centre" aspect of the factory undercarriage
retraction geometry and why it is a challenge to get the last bit of retraction
achieved.
The purple indicates the lower factory pivot position of the spring block. The
yellow indicates the revised pivot position that prevents an undercarriage lockup
scenario and achieves full mechanical advantage of the retraction mechanism.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=515243#515243
Attachments:
http://forums.matronics.com//files/3dab454d_9d39_4e88_8366_e8851141fd2d_125.jpeg
Message 2
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| Subject: | The Obsidian Files - Undercarriage - The Scotland Directive |
A while back during conversation with another Europan it was explained to me that
a Scottish europa had a a unique "effortless" undercarriage mechanism that
used an alternate 180 degree throw arm... this intrigued me... so i sat there
for about a week and nutted it out and achieved a comparative result.
The mechanism uses a third lever running off the existing OEM throw lever. Measurement
of the mechanical forces required to action the undercarriage returned
very casual numbers regarding physical operator effort required.
Attached are three images showing geometry for retracted, midway, and extended.
It is a very elegant solution.
The extra unchanging yellow canted line marks the OEM factory extended position.
During retraction the undercarriage swing arm raises approximately an inch above
and then down into its parked position, and vise versa upon extension; it raises
slightly first, then drops down to extension.
That's all for now on this short and interesting chapter of the Obsidian Files.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=515244#515244
Attachments:
http://forums.matronics.com//files/38b58ccd_9321_43c7_b25f_8000daa9342e_206.jpeg
http://forums.matronics.com//files/690857c0_197a_45b2_9bbf_f093ccdccd34_156.jpeg
http://forums.matronics.com//files/8fe5e4d9_1996_4460_86d4_31bca4463468_149.jpeg
Message 3
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| Subject: | Re: The Obsidian Files - Undercarriage - The Scotland Directive |
I guess there is always a better mousetrap, but always at the cost of complexity
and weight.
FWIW, I find the simply, factored-down, mono mechanism design, with the bungees
work absolutely fine and with minimal effort.
In fact, just like in a performance car, I very much appreciate the ability to
feel the forces involved, to be able to assess the mechanical and aero performance
of the system. Adding mechanical advantage by definition reduces the feedback
feel by the same advantage gained.
FWIW
Cheers,
PeteZ
> On Jan 24, 2025, at 8:38AM, Area-51 <goldsteinindustrial@gmail.com> wrote:
>
>
> A while back during conversation with another Europan it was explained to me
that a Scottish europa had a a unique "effortless" undercarriage mechanism that
used an alternate 180 degree throw arm... this intrigued me... so i sat there
for about a week and nutted it out and achieved a comparative result.
>
> The mechanism uses a third lever running off the existing OEM throw lever. Measurement
of the mechanical forces required to action the undercarriage returned
very casual numbers regarding physical operator effort required.
>
> Attached are three images showing geometry for retracted, midway, and extended.
It is a very elegant solution.
>
> The extra unchanging yellow canted line marks the OEM factory extended position.
>
> During retraction the undercarriage swing arm raises approximately an inch above
and then down into its parked position, and vise versa upon extension; it
raises slightly first, then drops down to extension.
>
> That's all for now on this short and interesting chapter of the Obsidian Files.
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=515244#515244
>
>
>
>
> Attachments:
>
> http://forums.matronics.com//files/38b58ccd_9321_43c7_b25f_8000daa9342e_206.jpeg
> http://forums.matronics.com//files/690857c0_197a_45b2_9bbf_f093ccdccd34_156.jpeg
> http://forums.matronics.com//files/8fe5e4d9_1996_4460_86d4_31bca4463468_149.jpeg
>
>
>
>
>
>
Message 4
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| Subject: | Re: The Obsidian Files - Undercarriage - The Scotland Directive |
I guess there is always a better mousetrap, but always at the cost of complexity
and weight.
FWIW, I find the simply, factored-down, mono mechanism design, with the bungees
work absolutely fine and with minimal effort.
In fact, just like in a performance car, I very much appreciate the ability to
feel the forces involved, to be able to assess the mechanical and aero performance
of the system. Adding mechanical advantage by definition reduces the feedback
feel by the same advantage gained.
FWIW
Cheers,
PeteZ
> On Jan 24, 2025, at 8:38AM, Area-51 <goldsteinindustrial@gmail.com> wrote:
>
>
> A while back during conversation with another Europan it was explained to me
that a Scottish europa had a a unique "effortless" undercarriage mechanism that
used an alternate 180 degree throw arm... this intrigued me... so i sat there
for about a week and nutted it out and achieved a comparative result.
>
> The mechanism uses a third lever running off the existing OEM throw lever. Measurement
of the mechanical forces required to action the undercarriage returned
very casual numbers regarding physical operator effort required.
>
> Attached are three images showing geometry for retracted, midway, and extended.
It is a very elegant solution.
>
> The extra unchanging yellow canted line marks the OEM factory extended position.
>
> During retraction the undercarriage swing arm raises approximately an inch above
and then down into its parked position, and vise versa upon extension; it
raises slightly first, then drops down to extension.
>
> That's all for now on this short and interesting chapter of the Obsidian Files.
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=515244#515244
>
>
>
>
> Attachments:
>
> http://forums.matronics.com//files/38b58ccd_9321_43c7_b25f_8000daa9342e_206.jpeg
> http://forums.matronics.com//files/690857c0_197a_45b2_9bbf_f093ccdccd34_156.jpeg
> http://forums.matronics.com//files/8fe5e4d9_1996_4460_86d4_31bca4463468_149.jpeg
>
>
>
>
>
>
Message 5
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| Subject: | Re: The Obsidian Files - Undercarriage - The Scotland Directive |
I totally agree.
That is why a 1970's Silver Shadow will never be as exciting to drive as a 1902
American Underslung
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=515246#515246
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