Skeletal vs Plinth style turntables

Richardkrebs "The song, I got U BABE".
My dreams, shall we say, are usually more exciting in content.

Yes Richard, but I rarely remember the good ones after I wake.......the nightmares ....tend to linger.

I Got You Babe

the song has some significance for me.
I was 3? at the time, but I can still remember seeing this on my parents little circular screen black and white tv for the first time.
I believe their show made a lasting impression on me. I say this because when my wife and I got married we went away to Palm Springs. Sonny had a restaurant there. We made a point of having dinner there one night and having our picture taken with him.
Charming fellow. We were saddened later, not sure now how much later it was now after we saw him, to learn he had died hitting a tree while skiing.

Thanks for the number crunching.

Chris.
We all have songs lurking in our past that in some way stay with us.

Re the number crunching.

The figure given was for a perfectly inelastic collision. If the collision was perfectly elastic the new train speed would be around 99.99996 KPH. 0.00004% speed reduction.
It just goes to show that little things can influence big things, even if they are 10 million times lighter.

cheers.

Halcro and Dover are correct although both muddy the waters slightly.
Halcro, by explaining the principles of structural forces necessary to move a sufficiently large armpod and Dover by mentioning the speed-correction circuitry of a DD turntable.
Neither point is relative to the Timeline and a moving armpod.
A moving armpod will be displayed by the Timeline on a belt-drive turntable and idler both without servo control.

The mistake being made is concluding that the Timeline is measuring rotational speed.
It is not.
The rotational speed is pre-dialled into its algorithm so that the flashing strobe merely confirms any deviations.
The Timeline device actually measures 'movement' to a microscopic degree. That is why it is able to visually display the effects of stylus drag as 'movement'.
As Dover points out, in a closed-loop system, any movement of the dependent particles in relation to another will be displayed by a device designed to detect movement.

@RichardKrebs

Richard, I am interested in your impressions of my isolated armpod experiment findings. First post above with a date of 2-12-15

thanks Chris

02-12-15: Basephysics
A moving armpod will be displayed by the Timeline on a belt-drive turntable and idler both without servo control.

Henry.... time to wake up now. We need your help. We need you to pull a volunteer from your Victor "Armpod" team, and have him join forces with your Raven "tonearm fixed to the turntable" team. If he resists, tell him its in the name of Copernican good and the switch will be only temporary - maybe. Well "maybe" leave the "maybe" part out when talking to him. :^)

Basephysics - that's quite the moniker. I'm intrigued again, as I was with Parrottbee our OP(Original Poster). Is physics your line of work, hobby interest area ?

Now Henry can confirm better, but if I recall he said that the timeline on the Raven turntable moved; but that it moved slowly and consistently. This implied that his turntable although not right at 33.3, maybe a little above (line going --->) this way or below line going (<-----) this way, the speed was still stable. So for purposes of enjoying records - just fine. Is that right Henry or am I blowing smoke out my ears ? Alas I don't own the thing. Also fwiw - based on Richard Krebs train calculations I would be very surprised if any movement can be observed from what is a "normal" situation for that turntable setup with its fixed tonerarm.

So I guess it depends on whether Henry is game to play for us to find out ?

On a personal note very much looking forward to Timeltel (Professor's) next thread synopsis :^)

Cheers