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Chassis stiffness improvements?

garage19 - 13/4/05 at 12:25 PM

http://www.ultimav12.ca/

Check out the chassis mods section.

Plenty of fuel there for the old argument for panelling the tunnel in aluminium to gain stiffness in the chassis!

"Covering the outside of the framewith 1.2 mm aircraft aluminum. 8100 ft/lbs/deg. to 8800 ft/lbs/deg"

Also notice the extra stiffness the engine bay cross brace makes!
Surely not too hard to make as a bolt on extra?

A chap posted some pics up recently of his very tasty rolling chassis locost with a nice bay cross brace.

locoboy - 13/4/05 at 12:31 PM

That was Liam IIRC 4x4 locost????

Liam - 13/4/05 at 12:45 PM

Yeah that's me

That's an interesting article that ultima one. Most surprising is how rubish the chassis is in standard form considering the price of those cars!

Liam

JonBowden - 13/4/05 at 01:11 PM

Liam,

did you ever measure the stiffness of your chassis ?

locoboy - 13/4/05 at 01:39 PM

Liam,

My thoughts exactly,

just thing how much stiffness you could get for 3K if you shopped around

[Edited on 18/4/05 by locoboy]

Fred W B - 13/4/05 at 02:07 PM

http://www.locostbuilders.co.uk/viewthread.php?tid=22142

See here also

Fred WB

tks - 13/4/05 at 05:03 PM

that thing must fly man..

pwww.. what an engine.

looks a bit like the McClaren F1 engine (also BMW v12)

Regards,

Liam - 13/4/05 at 05:26 PM

quote:
Originally posted by JonBowden
Liam,

did you ever measure the stiffness of your chassis ?

I'd love to know really. All I have is a balsa model much stiffer than a balsa model of a book chassis!! Actually a surprisingly good method.

I keep intending to either learn an fea package or do an aussie style physical test, but keep spending all my time doing other stuff.

The bracing over the engine bay in my chassis made a huge difference (on the balsa modelling), but that is partly because I can fit neither of the conventional R tubes in the engine bay and so without the structural scuttle and engine bay frame I have a horribly wobbly engine bay.

Liam

andylancaster3000 - 13/4/05 at 07:02 PM

Liam, What scale did you do your model to and was the size of the balsa strips to scale too. Also, what method of joining the the balsa wood did you use.
As you can see i'm interested in making a model of the chassis too! (That chassis is stunning by the way, i do like the in-board suspension.)

Cheers,
Andy

Liam - 13/4/05 at 10:15 PM

Cheers Andy...

My model was either 1/10 scale with 2.5mm balsa or maybe 1/8 with 3mm. At any rate the balsa 'tube' was meant to be to scale. To be honest the model ends up extremely stiff and you could just as well use underscale balsa to be able to see the flex a bit better.

I used superglue which worked fine. Although now it has gone a bit brittle and too much flexing can break joints. There's probably a better adhesive to use but i dunno really.

Liam
Rescued attachment chasismodel.jpg

Avoneer - 13/4/05 at 10:24 PM

Nice beer collection as well!
Pat...

DEAN C. - 15/4/05 at 11:31 PM

I reckon with a bit more paper ang glue and some string it could be flown as well.
Oh sorry I thought it was Blue Peter!

Seriously you have to be admired for the original chassis,well done Liam.

andyps - 16/4/05 at 09:04 PM

quote:
Originally posted by Liam

I used superglue which worked fine. Although now it has gone a bit brittle and too much flexing can break joints. There's probably a better adhesive to use but i dunno really.

Liam

Probably Balsa wood cement if you can still get it.