Prev: MISFIT Road Updates
Next: Would someone define "racism"
From: Big Ben on 16 Jul 2010 09:25
m...(a)nospam.com wrote:

> there are formulas for that stuff all over these days

never even occurred to me to google it....just sat down and did it the
old fashioned way.
took length of stroke, doubled it (for one full cycle of up and down)
multiplied by 1000 rpm, divided by 12 inches, divided again by 60
seconds and got my piston speed in feet per second....then I divided
again by the length of stroke to come up with the multiplier I
posted....I did round stuff off for final result, so numbers my be off
by a few hundreths, but still close enough for curiosity...

hmm, I could write out the formulae instead...

FPS (2L* RPM) / 720 = PS
MPH (((2L * RPM)60)/12)/5280 = PS

--
Big Ben
BS266
the "gonna go put new springs in a truck....and get paid to do it!"
Slug










From: Rand McNally on 16 Jul 2010 11:31
On 7/16/2010 9:25 AM, Big Ben wrote:
>
> never even occurred to me to google it....just sat down and did it the
> old fashioned way.
> took length of stroke, doubled it (for one full cycle of up and down)
> multiplied by 1000 rpm, divided by 12 inches, divided again by 60
> seconds and got my piston speed in feet per second....then I divided
> again by the length of stroke to come up with the multiplier I
> posted....I did round stuff off for final result, so numbers my be off
> by a few hundreths, but still close enough for curiosity...
>
> hmm, I could write out the formulae instead...
>
> FPS (2L* RPM) / 720 = PS
> MPH (((2L * RPM)60)/12)/5280 = PS
>

Math is fun, in a "feels so good when I stop" kinda way-

I ain't no engineer, but I think your formula shows mean piston speed. Max speed and max
accelleration (G-force) are, to me, more interesting. Max speed is mid stroke and max
g-force is at top and bottom. I'll leave the rest of the details to Google.

fer instance:
http://www.epi-eng.com/piston_engine_technology/piston_motion_basics.htm

(hops behind bar and starts pouring pitchers as fast as he can)

Have a few rpms on me-

--
Rand McNally BS#263
Yer not lost if you get back before the search party finds you...
From: Big Ben on 16 Jul 2010 12:45
Rand McNally wrote:

> I ain't no engineer, but I think your formula shows mean piston speed. Max speed and max
> accelleration (G-force) are, to me, more interesting. Max speed is mid stroke and max
> g-force is at top and bottom. I'll leave the rest of the details to Google.
>
> fer instance:http://www.epi-eng.com/piston_engine_technology/piston_motion_basics.htm
>
> (hops behind bar and starts pouring pitchers as fast as he can)
>
> Have a few rpms on me-

/scratchin' head/ yep yer right....butt mean piston speed is pretty
much what I was lookin' for, and is close enough for curiosity....that
and I aint got the edumacation to figger in acceleration vectors and g-
forces.
I looked at that website, and while it makes sense and I mostly
understand it, it does make my head hurt a little <sfsf>


as an aside, I actually made some cash today, did a spring swap on a
pickup, hell, I thought I was going to rebuild the spring pack (I do
it with the mainspring still attached to the vehicle, PITA, but easier
in the long run)....everything came apart and went together smoothly,
easiest and fastest $50 I ever made without selling something.....
think I'll throw some gas in the pickup and take the kids
fishing....or something

--
Big Ben
BS266
the "wish I could pick up a few more side jobs like that" Slug
From: Snag on 16 Jul 2010 13:37
Big Ben wrote:

>
> --
> Big Ben
> BS266
> the "wish I could pick up a few more side jobs like that" Slug
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

I wish I could too ! Unemployment sucks . Unemployed and the gov't cheese
has run out sucks more .
--
Snag
Got Guns ?


From: Snag on 16 Jul 2010 20:58
snarl(a)trippin.com wrote:

> Want some side jobs too? http://www.cncguns.com/tooling.html Insert
> standard disclaimer there --->
>
> Snarl... I gotta do everything around here

Funny you should reference that type of side job ... I've been working on
some parts outta O1 this afternoon for someone .

--
Snag
Got Guns ?


 |  Next  |  Last
Pages: 1 2
Prev: MISFIT Road Updates
Next: Would someone define "racism"