Springfield Flyer.

[manta22]

Mike;

Rex is right, long skinny bars tend to bow out sideways when placed in compression but you could increase the diameter of the bars to reduce that. Large diameter light gauge tubing is better than small heavy- wall tubing.

Where possible it would help chassis stiffness to weld on thin sheet steel stressed panels. They do interfere with access but you can cut out holes for access and if you use a doubler ring and tight-fitting bolts it will act like a one- piece panel. Don't forget that  torsional stiffness is important, too.

Your project is looking great!

Regards, Neil  Tucson, AZ

[tauruck]

Thanks everyone.

I did some extra work changing the set up and the first iteration
was a hoop tacked on forward of the motor where I was hoping
to use fittings as shown by Dynoroom.
The thinking was that I'd be able to "shorten" the tubes but I never
liked it.

Trying to get space for the airbox, inlets and keep the material within
the confines of the body is no easy task and the pics of Dennis Mariani's
liner gave me a new idea.

[tauruck]

I cut the hoop, taking out the top and replaced it with a
heavy wall rectangular tube where I welded the ends shut
after fitting anchor nuts. The uprights bolt to it with two fasteners.

[tauruck]

I will have space for the airbox and any cross bracing I'm going to fit.

Forward of the rectangular box I can now change the angle of the two
braces that connect to the cockpit.

It's a work in progress and once again I've been reminded that fully welding certain components
is a bad idea. I've made mistakes on this build and that is one lesson that keeps biting me.

The shiny bits between the upright and the rectangular box is 1,2mm Alclad I used as spacers
so as to be able to remove and refit parts.

[tauruck]

I'll have more pics as I go.

I have 1/2" clearance between the rocker box and the tube.
Good news I think.

Got a way to go but feeling much better about how it's coming.

[tauruck]

There are still tubes to add to the chassis rails both under the motor and on the sides
and one idea I had was as depicted in the image.

[Peter Jack]

Mike, will you have enough room to remove the rocker cover without removing the bar. Remember you've only got an hour to do the service for the return run and it would be a shame to not complete a record run because of a loose rocker.

Pete

[tauruck]

Unfortunately not Pete.
Two bolts to remove the bar plus whatever cross braces
we build in.

This is compromise at its finest and I'm stuck with it.
Thanks for the heads up.

[Dr Goggles]

It's a work in progress and once again I've been reminded that fully welding certain components
is a bad idea. I've made mistakes on this build and that is one lesson that keeps biting me.

The easiest thing in the world is holding the mig trigger in.

It's almost like you should fit a guard the size of the front of your grinder over the mig head, if you cant reach it with that on then don't weld it until you're dead sure it doesn't have to come off.....

Speaking from expewience

[tauruck]

Right on James.

[tauruck]

The braces are tacked in place and ready for final welding.

I know some of you might still suggest changes but I'm dictated to by the shape of the body
in that area and I also need space for the air box/plenum.

I had to move the hanger support for the turbo but have clearance.

[tauruck]

The tubes are actually 38mm hollow bar that was donated by a good guy called Peter
from BSPE.

[Rex Schimmer]

Again Mike I do hope you plan to put an X or diagonal in the frame bay that I question before as this bay is nothing but a large parallelogram hinge in your frame.

Rex

[tauruck]

Tom Burkland is a huge help on my build and he sent photos of his braces
and one design feature was a big winner.

He advised against the clevis set up at the top of the roll hoop.
The fear was that in the event of a crash one of the braces might shear off
and penetrate the cockpit. I was also worried about it but his system was so
practical it was a no brainer to make the change. Thank you so much Tom.

[tauruck]

Would adding the two short top braces be a good or bad idea?.