This is an amazing channel!! I’ve always been fascinated with suspension and sprung/unsprung weight etc and this is like a breath of fresh air for RUclips. Hope you’re enjoying yourself as if very much like you to keep up the great work!! Got a good backlog to get through though :)
If you use a selection of weights (or a water container to make the weight adjustable) to produce a constant force, you could measure the time it takes for the shock shaft to move from one position to another. Having a stopwatch running next to the shock and taking a slow-motion video with a high frame rate should allow you to pinpoint with fair accuracy the time it took for the piston to go from start to stop.
Very nice explanation, like always👌🤘In the late 90s was a time where two stage pistons were the talk of the town in rc racing....well that stopped quickly because it's really not needed and overcomplicate things.😊They are still out there though.
@BoomslangSuss that's funny. Great vid. Idk what part of the country you're in, but if you want to see the biggest tiny truck comp in the US, Supershafty Fall Crawl is in MD in a few weeks. Amazing event.
Will you be discussing how the different hole configurations on the pistion, even with the same passage volume, will change the pack of the shock? I know this is more on the high speed side than low speed, but crawlers that tend to run heaver oils often could be worth a discussion. I personally prefer lighter dampening on my rigs with 40 to 45 wt oil the heaviest I typically would run. Thanks. With some doing timed runs, you may have to scoot over some terrain quickly to get to the next gate and be into higher speed dampening as well.
Something you might find interesting is that shock oil "weights" seem to be pretty arbitrary. Losi 50wt is 710cst but Team Associated 50wt is 640cst. They also aren't very linear. Going from Losi 20wt to 40wt is a 321cst delta but from 60wt to 80wt is a 204cst delta. Looking forward to the high speed video!
I’m not sure if “arbitrary” is the right word. Wt and CST are theoretically correlated linear scales. When people measure and publish differences, as you point out, it comes from a quality discrepancy (and some error in the measurement tools and operators) which for sure is the arbitrary part. I’m not sure how closely the RC world certifies their specs, but it doesn’t appear super consistent, especially across brands. Thanks for sharing.
That’s a fair guess but usually drill location are single dimples. At least that’s what another brands do. AE sells fully blank ones. I suspect it’s yet another damping variation - more edges and directing flow to those edges.
How do you calculate the percentage differences between oil viscocuties? Using the W-figure at face value and traditional percentage calculations, going from 20 to 25 should be an increase of 25%. Going from 25 to 20 should be a reduction of 20%. Going from 20 to 27.5 I got an increase of 37.5%, and in the other direction the reduction is 27.3%.
I use the percent difference formula because it's the same increasing or decreasing. What you’re explaining are percent increase and percent decrease formulas. Percent difference is the average of the two.
For constant speed, maybe use gravity. Mount a shock upside down on a scale, place a weight on the scale and zero it, then attach that weight to the end of the shock and let it drop and read the force on the scale to calculate the damping force? It's late and I'm off to bed so I'm probably forgetting to account for something like shaft and piston weights or something but you get the idea. ps. No relation to Ned.
I like how you are thinking, but that would produce a constant force and not a constant velocity. The force changes based on velocity. What you described simply weighs the parts independent of the speed they are moving. My mind went down that path as well.
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This is an amazing channel!! I’ve always been fascinated with suspension and sprung/unsprung weight etc and this is like a breath of fresh air for RUclips. Hope you’re enjoying yourself as if very much like you to keep up the great work!! Got a good backlog to get through though :)
Thanks for the kind words! I hope to make many more.
I legitimately hope you have a shock dyno in the channel one day. 🤞🏼💪🏼
I do too! Thanks for that. It would be so insightful. A motor dyno is also on my wish list.
If you use a selection of weights (or a water container to make the weight adjustable) to produce a constant force, you could measure the time it takes for the shock shaft to move from one position to another.
Having a stopwatch running next to the shock and taking a slow-motion video with a high frame rate should allow you to pinpoint with fair accuracy the time it took for the piston to go from start to stop.
That just might work. Applying as series of known forces and measuring the velocity. It's backwards but gets the same results.
Very clear and well explained, thanks! I’m looking forward the high speed part
Thank you!
Very nice explanation, like always👌🤘In the late 90s was a time where two stage pistons were the talk of the town in rc racing....well that stopped quickly because it's really not needed and overcomplicate things.😊They are still out there though.
Thanks for the feedback. I’m always second guessing myself - is this clear? Does it make sense?
Even fixed pistons have gotten too complicated IMO
I think precision pistons are something I’d like to try. Also smaller e clips capturing the stack would be better.
I giggle evetime you call M.I.P. Mip. Lol.
The hobby shop I went to in the ‘80s called it that and I guess it just stuck with me. They’ve been around a while.
@BoomslangSuss that's funny. Great vid. Idk what part of the country you're in, but if you want to see the biggest tiny truck comp in the US, Supershafty Fall Crawl is in MD in a few weeks. Amazing event.
Dang, I’m on the opposite coast. Thanks though. Maybe someday.
Will you be discussing how the different hole configurations on the pistion, even with the same passage volume, will change the pack of the shock? I know this is more on the high speed side than low speed, but crawlers that tend to run heaver oils often could be worth a discussion. I personally prefer lighter dampening on my rigs with 40 to 45 wt oil the heaviest I typically would run. Thanks. With some doing timed runs, you may have to scoot over some terrain quickly to get to the next gate and be into higher speed dampening as well.
Absolutely. I’m in the process of working on a high-speed damping video as we speak.
Something you might find interesting is that shock oil "weights" seem to be pretty arbitrary. Losi 50wt is 710cst but Team Associated 50wt is 640cst. They also aren't very linear. Going from Losi 20wt to 40wt is a 321cst delta but from 60wt to 80wt is a 204cst delta.
Looking forward to the high speed video!
I’m not sure if “arbitrary” is the right word. Wt and CST are theoretically correlated linear scales. When people measure and publish differences, as you point out, it comes from a quality discrepancy (and some error in the measurement tools and operators) which for sure is the arbitrary part. I’m not sure how closely the RC world certifies their specs, but it doesn’t appear super consistent, especially across brands.
Thanks for sharing.
@@BoomslangSuss Losi started printing it on the bottle caps a while back; the numbers I quoted are direct from manufacturer.
Interesting.
@JacobScherer Do you care if I quote you in an upcoming video? I am working on an explanation for this labeling discrepancy.
@@BoomslangSuss yeah buddy, go for it!!
My guess is the groove in the piston is a guide for drilling your own holes.
That’s a fair guess but usually drill location are single dimples. At least that’s what another brands do. AE sells fully blank ones. I suspect it’s yet another damping variation - more edges and directing flow to those edges.
How do you calculate the percentage differences between oil viscocuties?
Using the W-figure at face value and traditional percentage calculations, going from 20 to 25 should be an increase of 25%. Going from 25 to 20 should be a reduction of 20%.
Going from 20 to 27.5 I got an increase of 37.5%, and in the other direction the reduction is 27.3%.
I misspelled ”viscocities” but I won’t edit it because it sounds cute.
I use the percent difference formula because it's the same increasing or decreasing. What you’re explaining are percent increase and percent decrease formulas. Percent difference is the average of the two.
For constant speed, maybe use gravity. Mount a shock upside down on a scale, place a weight on the scale and zero it, then attach that weight to the end of the shock and let it drop and read the force on the scale to calculate the damping force? It's late and I'm off to bed so I'm probably forgetting to account for something like shaft and piston weights or something but you get the idea.
ps. No relation to Ned.
I like how you are thinking, but that would produce a constant force and not a constant velocity. The force changes based on velocity. What you described simply weighs the parts independent of the speed they are moving. My mind went down that path as well.