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#Post#: 6141--------------------------------------------------
Spring travel
DIR By: Jimr1999
Date: March 26, 2022, 2:02 am
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Morning all,
First spannering together yesterday of the springs on the BSA
3W. As they are an utter unknown, made out of wood bed slats,
and may not make it to the final assembly I put a band hinge
leaf to the hub underneath, then a full spring hub to hub, then
a long thin stainless steel tie/washer (2 foot rule from old
ones that have gone out of standard) then another shorter spring
on top - times four - like the original BSA.
Loading the front end yesterday with my 100kg frame the amount
of travel was minimal, less than 25mm. After my initial
experiments with the springs and loadings this has come as a bit
of a surprise. I am considering losing the shorter springs to
get more bounce...
Question.
What is a typical amount of deflection on cyclekart springs for
a similar loading?
Is harder better for our circuits?
As always your input is valued.
#Post#: 6142--------------------------------------------------
Re: Spring travel
DIR By: ChrisS
Date: March 26, 2022, 3:12 am
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Can't speak for others but mine drops 30mm with 60kg applied.
#Post#: 6143--------------------------------------------------
Re: Spring travel
DIR By: chrisenamels
Date: March 26, 2022, 3:26 am
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Don't be in too much of a rush to change things, my Morgan
seemed stiff enough with 40mm diameter springs, but they became
coil bound in use. I swapped them to 30mm diameter of the same
wire gauge and they're fine, static testing gives you some idea,
but you won't know until you drive it.
#Post#: 6144--------------------------------------------------
Re: Spring travel
DIR By: David F-R
Date: March 26, 2022, 4:02 am
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--- Quote from: Jimr1999 link ---
>
> Morning all,
> First spannering together yesterday of the springs on the BSA
3W. As they are an utter unknown, made out of wood bed slats,
and may not make it to the final assembly I put a band hinge
leaf to the hub underneath, then a full spring hub to hub, then
a long thin stainless steel tie/washer (2 foot rule from old
ones that have gone out of standard) then another shorter spring
on top - times four - like the original BSA.
>
--- End Quote ---
That is looking very smart Jim.
#Post#: 6145--------------------------------------------------
Re: Spring travel
DIR By: Jimr1999
Date: March 26, 2022, 6:33 am
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Thanks all, I will leave them be for now and design the spring
clamps for adjustment enough if I need to soften up. All is
unproven until it rolls I suppose. ;D
#Post#: 6168--------------------------------------------------
Re: Spring travel
DIR By: TheGiantTribble
Date: March 28, 2022, 3:51 am
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One of the things about CK's is although they are light and not
that fast, the large diameter of the wheels
seems to increase the effect of force acting on the
suspension...leverage I guess.
So I wouldn't worry about not much movement when you load it
with a static load.
Also I can't help wondering...old cars often had their springs
wrapped with string/rope, might be an idea, not
to look authentic (although it's a good excuse)but to assist
with resisting the wood from splitting???
Also love the use of a 2 foot ruler...Genius!
#Post#: 6171--------------------------------------------------
Re: Spring travel
DIR By: Jimr1999
Date: March 28, 2022, 5:55 am
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@Giant Tribble. You read my mind with the string thing. I intend
to do some french whipping to tidy them up
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