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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