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02-04-2018, 03:36 PM | #1 |
Pebble Pounder Join Date: Jan 2018 Location: Spain
Posts: 146
| Why RC rock clawers have suspension? First I want to say that I am talking of competition Class 1 - Superclass and Class 2.2 rigs not other ones. The suspension on an RC car has the the only functions of keeping the wheels on the ground in order to make it the most drivable possible and put as much traction to the ground as possible. I am use to design suspensions and other staff for real vehicles and now I am designing an RC superclass rock crawler. And I have realized that it is a completely different scenario and most of the standards on a vehicle suspension do not apply to RC rock crawlers or apply differently. The issue is that in order to make the suspension work as better as posible the unsprung mass should be as low as posible. But in the case of this crawlers most of the mass (provably around 90%) is unsprung mass. So now great part of the suspension function has to be taken care by the tires and foam and links. So the question is, what is the function now of the shock absorbers, as they barely have to support any weight? I believe they are energy reservoirs systems that are able to save some energy when dining and release afterwards when marching again. The do not act like that when scrubbing because we normally use one way only shock absorbers (may be someone have already have tried double direction shock absorbers) So I think that we may start thinking and tunning them differently. Please let me know your thoughts. Last edited by gonper; 02-04-2018 at 03:54 PM. Reason: adding info |
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02-04-2018, 03:47 PM | #2 |
MODERATOR™ Join Date: Jul 2004 Location: Ohio
Posts: 18,928
| Re: Why RC rock clawers have suspension?
Controlled weight transfer.
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02-04-2018, 04:02 PM | #3 |
Pebble Pounder Join Date: Jan 2018 Location: Spain
Posts: 146
| Re: Why RC rock clawers have suspension? |
02-04-2018, 05:33 PM | #4 |
RCC Addict Join Date: Feb 2016 Location: Santa Maria, CA
Posts: 1,751
| Re: Why RC rock clawers have suspension?
Are you familiar with torsion chassis' on rc crawlers? I have a Dahu torsion chassis that I'll be building an MOA crawler around (hopefully soon) that eliminates all traditional shocks/springs/links and relies on the chassis itself to provide the controlled movement of the axles. Billet Works also sells a 1/2 torsion chassis, called the Mantis, where the front end is still sprung. These types of chassis' aren't for everybody and they are sure to drive/react differently than traditional suspension setups, but they might get you thinking further outside of the box if that's what you're after?
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02-05-2018, 06:42 AM | #5 | |
Pebble Pounder Join Date: Jan 2018 Location: Spain
Posts: 146
| Re: Why RC rock clawers have suspension? Quote:
The chassis flexibility is where energy is stored when dining and scrubbing. About reactions, I think that if oil dampeners are added to the Dahu chassis in order to control its flex reactions will make it easier to drive. And yes I am thinking out of the box for my superclass design (here: Crazy axles idea design) Anyway I think that for a superclass a flex chasis may not bee a good idea due its size, and because it may be difficult to fine tune it. | |
02-05-2018, 10:05 AM | #6 |
RCC Addict Join Date: Nov 2014 Location: Nowhere
Posts: 1,326
| Re: Why RC rock clawers have suspension?
OP have you seen the BWD Mantis chassis? BWD XR-Mantis Prototype Chassis Kit...All New! |
02-05-2018, 11:00 AM | #7 |
I wanna be Dave Join Date: Oct 2012 Location: Medina
Posts: 2,263
| Re: Why RC rock clawers have suspension?
Articulation to keep wheels in contact with surface, therefore creating traction.
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02-06-2018, 01:41 PM | #8 | |
Quarry Creeper Join Date: Aug 2017 Location: Surface of the Sun
Posts: 324
| Re: Why RC rock clawers have suspension? Quote:
To keep Pressure on the surface, with the tires. You could almost run the Shocks empty..... as Damping at Crawler speed is nearly redundant. The Springs are doing all the work. | |
02-06-2018, 07:08 PM | #9 |
MODERATOR™ Join Date: Jul 2004 Location: Ohio
Posts: 18,928
| Re: Why RC rock clawers have suspension?
A torsion chassis is a spring and the biggest problem with them is their lack of dampening, which is why you don't see many anymore.
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02-07-2018, 06:13 AM | #10 | |
Pebble Pounder Join Date: Jan 2018 Location: Spain
Posts: 146
| Re: Why RC rock clawers have suspension? Quote:
Although the springs regulate how the gravity force is distributed among the wheels, because they regulate how torsion happens and derivate some of the gravity force from one/s wheel/s to another/s. The oil dampeners makes that the movements created by the force transitions to be slower. That avoids fast movements of the axels/wheels that may create big inertial forces that can affect the vehicle stability, so oil dampeners makes the rig more controlable. So yes oil is necessary in order to have a more stable and easy to drive vehicle. | |
02-07-2018, 06:29 AM | #11 | |
Pebble Pounder Join Date: Jan 2018 Location: Spain
Posts: 146
| Re: Why RC rock clawers have suspension? Quote:
For superclass I thing that they may be too flexible and the axels with the double steering may be wandering around instead of following the desired paths. | |
02-07-2018, 06:34 AM | #12 |
I wanna be Dave Join Date: Oct 2012 Location: Medina
Posts: 2,263
| Re: Why RC rock clawers have suspension? You don't see them much anymore, but I recently saw a guy driving one and he was doing amazingly well with it. I think some of it comes down to driving style. But, for my "style", I'll take shocks/dampeners all day long! |
02-07-2018, 07:52 AM | #13 |
Moderator Join Date: Sep 2008 Location: PA
Posts: 13,935
| Re: Why RC rock clawers have suspension?
Rock Clawler? Am I the only one that thought of this toy truck from my childhood? |
02-07-2018, 11:16 AM | #14 |
RCC Addict Join Date: Jun 2017 Location: Canada
Posts: 1,742
| Re: Why RC rock clawers have suspension? |
02-07-2018, 03:56 PM | #15 |
MODERATOR™ Join Date: Jul 2004 Location: Ohio
Posts: 18,928
| Re: Why RC rock clawers have suspension?
Pimp Cane, which I never had TCS Stick, which I had, and has one shock on each axle, on the same side DNA SSS, here EP's 'Sportsman' SSS Axial Last edited by EeePee; 02-07-2018 at 03:59 PM. |
02-08-2018, 05:03 AM | #16 | ||
Pebble Pounder Join Date: Jan 2018 Location: Spain
Posts: 146
| Re: Why RC rock clawers have suspension? Quote:
Quote:
I suppose that it is difficult to tune it. | ||
02-08-2018, 07:41 AM | #17 |
Nope.. Join Date: Aug 2005 Location: Whiteland, Indiana
Posts: 1,849
| Re: Why RC rock clawers have suspension?
Wasn't there an emoji that was talking to a wall at one point? I feel like it is now the only appropriate response.
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02-08-2018, 08:14 AM | #18 |
~THE SCALE SHOP~ Join Date: Apr 2006 Location: KILLEEN TX
Posts: 10,056
| Re: Why RC rock clawers have suspension?
the other down side to the torsion rigs is they require alot of wheel weight to work well. opposite of where the sport has gone. i had a super and later a 2.2 pimp cane. |
02-26-2018, 12:42 PM | #19 | |
Quarry Creeper Join Date: Jun 2012 Location: Earth mostly
Posts: 478
| Re: Why RC rock clawers have suspension? Quote:
Some crawlers can spit out some pretty good speed. My brushless AX10 can hop a pretty good gap. Without shocks it would bounce like crazy. I typed this almost auto correctly free | |
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