grovenor-2685 wrote:Ok search does reveal that you used 'impulse' in this
message.but made it synonymous with a vague sort of bump.
I thought the layman "bump" was more generally understandable across the posting audience.
My apologies, I thought we were the audience.
I thought I'd taken pains to indicate that equalizing beams and fulcrums could be stacked (and added transversely) as well as paralleled to handle the general case.
I don't think there is any argument on that, the flexichas book, S4 digest and CLAG website do cover it all pretty thoroughly.
Regards
I apologize for any ambiguity. That was not in any way intended to offend. My hopefully by now understood goal is to show that there is a perfectly viable alternative method of 100% successful and dependable chassis construction for entry level, or less technically skilled, or less technically interested, P4 modellers. A method without the use or need for the complexities, extra work and know-how of primary springing. A method that in most cases, does not need the accuracy and alignment issues of working hornblocks. A method that builds on the prior straightforward and already well understood, methodology of Flexichas.
Unfortunately I do not have an equally easy method of mounting P4 wheels, or worse the thinner p:87 ones, accurately onto their axles. IMHO, that would also be an extremely positive chassis construction aid for members of both the P4 and P:87 communities.
Regarding the Digest. Back at the time when I first perused it, I never noticed any reference to the fundamental slight twisting of track on curved grades, nor any form of deductive comparison, whether regarding static cases or impulses or otherwise, that theoretically supported the progression from beams, to springy beams, to CSB's as providing increasingly better track holding. Mostly I saw the Digest as rightly pointing out the negative aspects of 3 point suspension, but only subsequently making merely assumptions that springing, and then CSB's, were obviously preferable to any form of beams, whether truly equalized or not.
Hence my concern that such comparisons have not been truly explored up to the present time
Andy