Are Pneumatic shockabsorbers usefull in a suspension?

[KikoTube]

So i just saw These parts:

this parts came out before my "lego time" . 

I watched some Reviews on yt. They seem to be a bit slow. I think i could modify them a bit (harder spring etc.)

Does anyone of you Afol´s have experience with these shock Absorbers used in this way?

[Gnac]

The quick compression / slow rebound thing always put them out of my mind as a suspension solution, particularly as the 4 of these that I own all have different rebound speeds. It might be worth it to modify them if you can find suitable springs (the ones from the Unimog are too long) but in the end you'll only get an extra studsworth of travel in comparison to the Unimog shocks.

[Imanol BB]

I know that those absorbers can be used for suspension, not by personal experience but i have seen them into heavy trucks, i will post it in a while, i need to remember where is the post (i saw them in Efferman´s MAN truck)

 

EDIT: I found it: http://www.eurobricks.com/forum/index.php?/topic/60459-effes-moc-corner/&do=findComment&comment=1567193

 

Edited October 18, 2016 by ImanolBB

[KikoTube]

Thx for the Inputs

1 hour ago, ImanolBB said:

I know that those absorbers can be used for suspension, not by personal experience but i have seen them into heavy trucks, i will post it in a while, i need to remember where is the post (i saw them in Efferman´s MAN truck)

 

EDIT: I found it: http://www.eurobricks.com/forum/index.php?/topic/60459-effes-moc-corner/&do=findComment&comment=1567193

 

After a while of reading  i found a solution.

OleBm posted in that Topic: "This works well if you disassemble it, and then use a thick needle to poke one or two holes in the round rubber dampening part. When you then assemble it, it will work as a real shock absober in a real car."

So i will try that :) I ordered them

[MRP_]

well if you want normal shocks, there are pieces for that, but these are specifically meant to be dampened. if you just want normal shocks, it would be easier and cheaper to just get some of these https://www.bricklink.com/v2/catalog/catalogitem.page?P=95292c01#T=C&C=3, I think those match the spring hardness, but I'm not sure. 

also if you want more travel, these might be good also https://www.bricklink.com/v2/catalog/catalogitem.page?P=48912c01#T=C

[KikoTube]

4 hours ago, MRP_ said:

well if you want normal shocks, there are pieces for that, but these are specifically meant to be dampened. if you just want normal shocks, it would be easier and cheaper to just get some of these https://www.bricklink.com/v2/catalog/catalogitem.page?P=95292c01#T=C&C=3, I think those match the spring hardness, but I'm not sure. 

Thx for your reply 

But actually i have a lot of the springs. But i thought pneumatic shockabsorbers would be more realistic.

4 hours ago, MRP_ said:

also if you want more travel, these might be good also https://www.bricklink.com/v2/catalog/catalogitem.page?P=48912c01#T=C

They are way too expensive.. The cheapest on bricklink costs around 15€

It would be cheaper to buy 4 of the pneumatic shocks then 1 of those..

But thanks for the effort

[paul_delahaye]

Not only are these quite expensive, they were also quite unreliable from memory, certainly the one on the red technic car, I seem to recall it even came with a spare, and both have developed faults over time.

[nerdsforprez]

16 hours ago, ImanolBB said:

I know that those absorbers can be used for suspension, not by personal experience but i have seen them into heavy trucks, i will post it in a while, i need to remember where is the post (i saw them in Efferman´s MAN truck)

 

EDIT: I found it: http://www.eurobricks.com/forum/index.php?/topic/60459-effes-moc-corner/&do=findComment&comment=1567193

 

Yes, typically, air suspension is used for vehicles with a huge payload.  That is because springs have such a fast rebound that when you are dealing with a huge payload the fast rebound can throw the whole vehicle off-kilter from just the rebound.  I remember seeing a documentary on the large AirBus planes, and trying to figure out the landing gear was a nightmare for the engineers because shocks would recoil and send the plane in a frizzy after the first landing touch-down, which is usually pretty hard.  What they discovered was a suspension that had no metal coils, only used air for the compression.  The pilot could hit the ground fairly hard, but the landing gear would only compress air, not metal springs, which would not recoil.  This would give the plane a soft landing without the rebound/recoil thing.....

[Imanol BB]

I didn't knew about the system the engineers used at that time, its a very interesting information, i also know that modern landing gears use air or oil to avoid rebound like most of the cars do, which work by adding some dynamic friction and that way the suspension wont be jumping up and down for too much time with every obstacle in the road, and this is the problem of most of the non-maintained vehicles, when this dynamic friction of the suspension is lost, the car will jump a lot with every obstacle, and people may think it is a air-ride vehicle, but it is not.