Keith,
The Salt Sonnet held up well, for a crash at 200 mph and the way it crashed.
Remember the speed and way that a car crashes is very important. The sonnet
lifted the front and kind of rolled over, it stood on its tail and flipped
around a couple more times. BTW, I was standing at the 2 mile (right where
it happened) and was the first on the scene. One thing about the cage, it
had plenty of material properly braced.
There was a question about loads in an accident. I crashed a Lakester in 94
on the salt at 261 mph. After the accident some of the guys at work
estimated that I pulled 65 to 75 Gs when the car hit the ground.
Interesting enough the car was destroyed, EXCEPT for the cockpit area. The
forward roll bar was slightly bent, but the rest was useable (would never
let that happen though). If you saw me after the accident you would
believe I hit the ground hard!
I have spoken to the Dr. that helped design the seat for Formula 1 they are
using now. In an Indy car that was instrumented and hit the wall the driver
saw 100 Gs and lived. As a matter of fact he walked away from the incident.
The moral here is the human body can take some amazing forces, IN THE RIGHT
DIRECTIONS. You can be killed with a blow of less that 1G if properly
placed.
So remember, Speed, and severity of the accident are two important factors
to survival. Also, think about building the areas in front of and behind
the cockpit of smaller diameter material. One of the important design
features in an Indy car are crush zones, the cars ability to absorb the
impact lessens the loads placed on the driver..
Mike Manghelli
-----Original Message-----
From: Keith Turk <kturk@ala.net>
To: Lawrence E. & Cathy R. Mayfield <lemay@hiwaay.net>; Wester S Potter
<wspotter@jps.net>; Mike Manghelli <mmanghel@hughes.net>; John Beckett
<landspeedracer@email.msn.com>; Tom Neimeyer <3cbxs@ev1.net>; Land Speed
<land-speed@autox.team.net>
Date: Tuesday, February 15, 2000 5:12 AM
Subject: Re: Chassis Tubing
>How did George's Salt sonnet hold up by the way... I know he walked away
>but I was wondering how well the cage did. I have several Pictures of the
>car through the years.... and pictures of Rich Manchens Alfa in the chassis
>stages... (now there is a piece of art work )
>
>I have looked at Mayf's car very critically in the last couple of months
>and here is another great car.... What Mayf is doing that is absolutely
>right is that he bought a Quality Chassis kit and installed it to the
>Manufactures directions.... To include Tig welding which he had never done
>before. ( I think there is more to his Back Round then he is Professing...
>his Welding Skills are Pretty damn Good ) In any case Mayf's is another car
>that I would stick my son in....( my qualifier as to quality )
>
>Keith
>----------
>> From: Lawrence E. & Cathy R. Mayfield <lemay@hiwaay.net>
>> To: Wester S Potter <wspotter@jps.net>; Mike Manghelli
><mmanghel@hughes.net>; John Beckett <landspeedracer@email.msn.com>; Tom
>Neimeyer <3cbxs@ev1.net>; Land Speed <land-speed@autox.team.net>
>> Subject: Re: Chassis Tubing
>> Date: Monday, February 14, 2000 12:30 PM
>>
>> For anyone interested, I got my structural analysis program off the net.
>It
>> is called Cadre. Joint fixity, pipe size, etc can be included. It will
>give
>> loads and deflections. But the hard part is estimating the amount of
>input
>> (eg crash loads) to make it work ok.
>>
>> mayf
>> At 08:04 PM 2/14/00 -0700, Wester S Potter wrote:
>> >Mike, List,
>> >When you see the results of the forces some of these cages and frames
>are
>> >subjected to in an "incident" the question is not just is the tubing
>strong
>> >enough but is the bracing and welding up to absorbing the forces. Mayf
>> >mentioned a while back that he had the triangulation figured out on his
>> >cage. I thought at the time that it would be nice to have a rocket
>> >scientist or a structural engineer to run such a structure by just to
>make
>> >sure things were properly thought out. The days of Harvey Haller and a
>roll
>> >bar shorter than the top of his head are thankfully over on the salt.
>The
>> >ruling a few years ago requiring the additional roll-cage distance
>forward
>> >from the front of the face shield caused some grumbling but made such
>good
>> >sense. I have no idea of the qualifications of all the inspectors but
>would
>> >hope that those with the knowledge would have the guts to step up and
>say
>> >something when they think a critical structure is not properly built.
>> >Wes ... with a square of George"s Salt Sonnett as a reminder.
>> >----------
>> >> From: "Mike Manghelli" <mmanghel@hughes.net>
>> >> To: "John Beckett" <landspeedracer@email.msn.com>,"Tom Neimeyer"
>> ><3cbxs@ev1.net>,"Land Speed" <land-speed@autox.team.net>
>> >> Subject: Re: Chassis Tubing
>> >> Date: Sat, 15 Jul 2000 17:55:13 -0700
>> >>
>> >>John,
>> >>
>> >>You are correct about the added tubing and bring up a good point about
>the
>> >>motorcycles.
>> >>
>> >>Skip, this sounds like another one for the rules committee to look at,
>add
>> >>it to the list.
>> >>
>> >>Mike Manghelli
>> >>SCTA President
>> >>-----Original Message-----
>> >>From: John Beckett <landspeedracer@email.msn.com>
>> >>To: Tom Neimeyer <3cbxs@ev1.net>; Land Speed
><land-speed@autox.team.net>
>> >>Date: Monday, February 14, 2000 6:44 AM
>> >>Subject: Re: Chassis Tubing
>> >>
>> >>
>> >>>Tom
>> >>>
>> >>>Generally the extra weight of the larger tubing isn't a problem with
>LSR
>> >as
>> >>>it would be in drag racing. And the added security of the larger
>material
>> >>>may well be worth the slight extra cost. Hey the I/BGS record is 253
>MPH!
>> >>>
>> >>>I've often wondered why Motorcycle Streamliners are allowed 1 1/4-inch
>x
>> >>>.090" tubing when some of these guys are running over 300 MPH.
>> >>>
>> >>>John Beckett, LSR #79
>> >>>
>> >>>----- Original Message -----
>> >>>From: "Tom Neimeyer" <3cbxs@ev1.net>
>> >>>To: "Land Speed" <land-speed@autox.team.net>
>> >>>Sent: Sunday, February 13, 2000 9:59 PM
>> >>>Subject: Chassis Tubing
>> >>>
>> >>>
>> >>>> LSR'ers,
>> >>>> In the next year I plan on building a small streamliner. My
>> >>>understanding
>> >>>> from reading the rule book is that I can build the frame/rollcage
>from 1
>> >>>5/8
>> >>>> .120 thick DOM steel tubing. Is this correct? The liner will be
>> >either
>> >>>> H/GS or I/GS or possible H/BGS or I/BGS. Any benefits to use 1 3/4
>?
>> >>>>
>> >>>> Thanks, Tom
>> >>>>
>> >>>>
>> >>>
>> >>>
>> >>>
>> >>
>> >>
>> >
>> >
>> >
>> >
>>
>>
>>
>> L.E. Mayfield
>> 124 Maximillion Drive
>> Madison, Al. 35758-8171
>> ph: 1-256-837-1051
>>
>> http://home.hiwaay.net/~lemayf
>>
>> lemay@hiwaay.net
>>
>> Sunbeam Tiger, B9471136
>> Sunbeam Alpine Bonneville Land Speed Racer,
>> '66 Hydroplane Drag Boat (390 FE)
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