Some of this makes sense up till the point it is simply wrong ? [ well for 2 wheelers ]The faster a bike wheel turns the more gyroscopic force tries to straighten it (which allows you to let go of a rolling 2 wheeler and it carries on going, or assists you in riding "no-hands" on a 2 wheeler DF bike).
Sorry. My wife also says I am wrong....about so many things.Some of this makes sense up till the point it is simply wrong ? [ well for 2 wheelers ]
Can't find what I am looking for will this do ?But, I think the free-running 2-wheeler part is a red-herring and the precession, snatching element of a wheel "disturbed" (as shown in the lecture) and the linkage of 2-wheels where one can directly influence the behaviour of its sibling is still very much relevant. .....although you may still find evidence to tell me I am still "WRONG".
If only it was that simple grass hopper !??? Caster is easy to measure. Simply place a smartphone against the kingpin, vertical when looked at from the front. Any relevant app will tell you the angle.
If your kingpin curves you should straighten it Paul! The kingpin is a straight line and as such can be measured at any point along it. I assume you mean the curve of the headtube? Written English is often an opportunity to fail to express your meaning. I've been misunderstood many times when I thought I was clear.If only it was that simple grass hopper !
There is only 1 place you can measure castor and that is a line on the kingpin that is at the furthest point of the cylinder [ either front or back ] from the frame before the king pin curves away from the frame ?
Usually a king pin has cups for bearings that reduce it's height to less than a smart phone
Smart phones do not have square case edges , they are rounded so cannot lie flat and perpendicular ?
I gave up trying to use one to determine prop shaft angles and bought one of these instead:-
Now this will be hard to use as it has a flat base and a king pin is generally round not flat ?