John,
Your right, several of the small streamliner folks have been willing to
share some information with me. Seems most weigh 1200-1400 pounds, without
driver.
1 5/8 --.120 wall weighs 1.85 pounds per foot, or so I'm told.
Regards, Tom
----- Original Message -----
From: John Beckett <landspeedracer@email.msn.com>
To: Hyatt Engineering Ltd. <Hyatt-Engineering-Ltd@fuse.net>;
<land-speed@autox.team.net>
Sent: Monday, February 14, 2000 2:06 PM
Subject: Re: Chassis Tubing
> Greg
>
> Good point, worthy of further discussion, but I bet if you weigh some of
> these Scooter Streamliners their a tad over 500kg.
>
> John Beckett, LSR #79
>
>
>
> ----- Original Message -----
> From: "Hyatt Engineering Ltd." <Hyatt-Engineering-Ltd@fuse.net>
> To: <land-speed@autox.team.net>
> Sent: Monday, February 14, 2000 12:22 PM
> Subject: Re: Chassis Tubing
>
>
> > Tom and John,
> >
> > You will find 2" tubing less expensive from some sources than 1.75 or
> 1.625,
> > just because it is manufactured in higher volume.
> >
> > I think that the expense DOM is not required.
> >
> > And I have a question of my own. An earlier thread mentioned the use of
> > heavier walled tubing so the thinning typical on the outer portion of
> bends
> > would not drop below .120", but the rule book specifies "nominal"
> thickness,
> > so I assume this is not a problem ?? (but had better ask).
> >
> > Regarding the little tubes on the cycles, I will speculate that they are
> > justified by the low mass of the vehicles. A 2g impact of a 500 kg bike
> > will certainly not apply the loads to a cage that a 1500 kg door slammer
> > would. So if we wanted to get fanatical about it, the tubing size should
> > correlate to the product of the vehicle weight and speed.
> >
> > The 2g value is one I grabbed out of the air, what kind of "extreme
event"
> > decelerations do most folks design their lakesters or streamliners to?
I
> > have read that 4.5 g's is the norm in formula one, but they have big
curbs
> > and things to hit.
> >
> > Thanks,
> > Greg
> > ----- Original Message -----
> > From: "John Beckett" <landspeedracer@email.msn.com>
> > To: "Tom Neimeyer" <3cbxs@ev1.net>; "Land Speed"
> <land-speed@autox.team.net>
> > Sent: Monday, February 14, 2000 8:38 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
> > > >
> > > >
> > >
> > >
> > >
> >
>
>
>
>
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