Digital scales in my bathroom, 700 grams was my record. Well, seven hundred and something. Can't remember the exact number.Originally Posted by Henk
Ta
Digital scales in my bathroom, 700 grams was my record. Well, seven hundred and something. Can't remember the exact number.
Why Not???: MNZ975.
Well that just says it all; doesn't it Drew?
...
Low personal B.M.E.P.
Light comes at the design stage. If you're looking at using tube that small, I'd suspect a space frame may be in mind. If so, using straight tube, no advantage in CrMo - and major cost disadvantages. At best, using under 1 in OD, you could go down 2 gauges in wall thickness, which as quoted elsewhere may just add up to one good manly crap....
If on the other hand you look at copying Kart type construction using tube around 1.25in, then CrMo and TIG starts to look like the way to go. CrMo is pretty commonly available in that sort of size too. Just ask a Speedway car builder for some.
Anorak
Drew did you weigh yourself before and after the dump ......or just shit on the scales again
Kinky is using a feather. Perverted is using the whole chicken
Two Wheels or Three = FUN
He shits on everything else...why not the scales?
Ta
I was kinda thinking of gantry style monocoque. After picking up an LCR long bike a few times last season to get it on it's stands, I discovered that the Aluminium ones are still fucken heavy.
Before and after. The wife went mental when she asked me why I was getting the grease proof paper out of the drawer.
I'm working on being positive. Counselor tells me it helps.
Low personal B.M.E.P.
i was involved on the edges of Bill Newton's "gantry style" frame - a friend of mine built it. Harder than a monocoque to get right - and as it turned out, very hard to alter once it was realised where it was wrong....And I'd think, size for size, not a lot of difference in weights either. They look lighter as there's a lot of air space, but....
Pick up a track ready kart and see what you think re weight. talk to someone who repairs them for material specs.
Counselor lies...your fees help him/her.
Ta
This is mostly practice...for making a full size chair. Shorty of course, since long bikes are fucken gay.
The difficult to alter part, I hadn't considered. But I sure can see why. I need to do more planning/drawing than expected.
Counselor gets paid for six sessions by the government, I've only used one. The lying will start at about the fourth I reckon.
Hardcore Biker
Material science lesson go: (My apologies for the parts of this that you already know)Last page of actually constructive for once talk.
So for you materials you have two properties that you are interested in for the pretty loose design task that is bucket sidecars. These are:
1. Yield Stress
2. Young's Modulus
Yield stress is the point at which the material will fail if a force is applied to it. In this case failure is defined as any plastic deformation (the material does not return to its original shape).
The Young's Modulus is the 'spring rate' of the material. A higher YM means that for the same force the material will deform less.
Chromo has the same Young's modulus as mild steel and most other steels, but has a higher yield stress.
When you are designing a chassis you need to keep yourself well away from the yield stress. This is where things bend and break. and getting even 1/3 of the way to yield stress can fatigue parts under the right conditions. What you will most likely be doing is putting some steel together, having a jump on it, asking yourself if it is stiff enough and adding more members to suit. This is the equivalent to building to a stiffness target.
So the crux of it is: If you took two chassis of the same construction, except one with mild and one with chromo, they would behave exactly the same for all normal riding conditions.
If you crashed the one with chromo it would probably hold up better. However the extra attention required when welding and then normalising the chromo (as it builds up a brittle structure at the weld during welding) makes it a bit harder to get right.
Mig up some mild with a shit tone of heat and filler and you are good to go.
elbow down dreamer
Weekend cruiser
Now I'm worried, even with out an engine our you need to be Arnold to hold it one handed...
Still there are a lot of factors that make a quick chair. Lap times will be interesting.
Ta
It seems to me that the pictured chair doesn't offer a great deal of input from the swinger, with regard to weight distribution. Beware the chair that only turns one way.
Hardcore Biker
I can feel you running me over already!
Unknown Disorder
First outing on the hub Center rig today, doesn't like right handers at all and damn near broke me with how much work it is to swing on, don't think Rick was any better off.
Stock is best
i'm a wanker
but ok for the new madmax movie i guess
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