RCCrawler Forums

floogldood · 12-17-2005, 09:37 AM

Hey I hope this is correct forum. I hear everyone call articulation and describe it by the number of degrees between the max angles of the axles. Anyways I am wondering if anyone makes or designs a crawler with articulating steering (like some farm tractors have)

So that neither axle is a steer axle, but the chassis swivels in the middle to steer the vehicle or even both steer axles and articulation steering?

Is this a good idea? I can think of one drawback being the wheelbase on the inside wheels gets very short and the other gets quite long to make it more tipsy? what do you'all think?

JasonInAugusta · 12-17-2005, 09:40 AM

That would limit the type of steering you'd have.

It'd be like having both axles on a "Y" harness.

Those of us who run rear steering run fully independent setups.

JohnRobHolmes · 12-17-2005, 01:45 PM

why not have both if you were to do it? I have never seen a swiveling chassis.

flatfender · 12-17-2005, 02:13 PM

it would have to be a monster of a servo to steer a "brokenback" crawler.
next time your close to a tractor that uses that style of steering, look at the hydrolic ram used for steering, it's huge for a reason.

Trike Kid · 12-17-2005, 02:15 PM

Yeah, you'd have to have at least one high torque large scale servo, if not multiple ones.

ILoveRCRockCrawlin · 12-17-2005, 02:23 PM

use hydralics. like JIA did on his scorpion

thaclodking · 12-17-2005, 05:47 PM

There would also be a problem with weight transfer. All of your weight would shift to the outside of your turning path, unless you had the weight balanced over the axles. But then you would have a possible issue of aproach and departure angles suffering. If this makes any sense at all I will be surprised as I have the flu and am not very coherent.

floogldood · 12-17-2005, 05:55 PM

I find on the tractor it uses a very similar size pump as a front steer tractor of the same size. It really does not take much effort, yet with no diffs at all and locked axles then it may be require lots of power. The turning radius was always surprisingly better.

Another benefit was the tire tracks will make only 2 circles instead of 4, maybe that's not a benefit? The thing I wonder about the most is the outside wheelbase going long and the vehicle tipping over.:?

halfcab · 12-19-2005, 08:21 PM

with the axles locked it would be very hard to steer, the inside track compared to the outside track would cause the truck to hop really bad as the tires fight each other for traction, just like a 1:1 truck locked up front and rear hops on granite, you could try it but I don't think it would work very well, just my .02. if you could make the f/r really tight limited slip units it could work.

Cubman · 12-19-2005, 08:43 PM

Looks like it uses a standard size servo...

floogldood · 12-19-2005, 10:13 PM

Hey there it is, that one steers everywhich way.

Do you think it would have the stability with the varying wheelbase?

I think it may be easier because at least the front and rear axles would be going the same distance (kinda like front/rear steer does)

12-17-2005, 09:37 AM	#1
floogldood Quarry Creeper Join Date: Nov 2005 Location: Planet Earth Posts: 350	Articulating? like a farm tractor. Hey I hope this is correct forum. I hear everyone call articulation and describe it by the number of degrees between the max angles of the axles. Anyways I am wondering if anyone makes or designs a crawler with articulating steering (like some farm tractors have) So that neither axle is a steer axle, but the chassis swivels in the middle to steer the vehicle or even both steer axles and articulation steering? Is this a good idea? I can think of one drawback being the wheelbase on the inside wheels gets very short and the other gets quite long to make it more tipsy? what do you'all think?

12-17-2005, 09:40 AM	#2
JasonInAugusta 06 Super National Champ Join Date: Jun 2004 Location: Stark Industries Bar and Grill Posts: 11,361	That would limit the type of steering you'd have. It'd be like having both axles on a "Y" harness. Those of us who run rear steering run fully independent setups.

12-17-2005, 01:45 PM	#3
JohnRobHolmes owner, Holmes Hobbies LLC Join Date: Nov 2004 Location: Volt up! Gear down! Posts: 20,290	why not have both if you were to do it? I have never seen a swiveling chassis.

12-17-2005, 02:13 PM	#4
flatfender Quarry Creeper Join Date: Jul 2004 Location: Deland Posts: 376	it would have to be a monster of a servo to steer a "brokenback" crawler. next time your close to a tractor that uses that style of steering, look at the hydrolic ram used for steering, it's huge for a reason.

12-17-2005, 02:15 PM	#5
Trike Kid RCC Addict Join Date: May 2005 Location: Auburn, WA Posts: 1,191	Yeah, you'd have to have at least one high torque large scale servo, if not multiple ones.

12-17-2005, 02:23 PM	#6
ILoveRCRockCrawlin RCC Addict Join Date: Dec 2004 Location: Central NY Posts: 1,980	use hydralics. like JIA did on his scorpion

12-17-2005, 05:47 PM	#7
thaclodking Rock Crawler Join Date: Sep 2004 Location: a place of settlement, activity, or residence. Posts: 842	There would also be a problem with weight transfer. All of your weight would shift to the outside of your turning path, unless you had the weight balanced over the axles. But then you would have a possible issue of aproach and departure angles suffering. If this makes any sense at all I will be surprised as I have the flu and am not very coherent.

12-17-2005, 05:55 PM	#8
floogldood Quarry Creeper Join Date: Nov 2005 Location: Planet Earth Posts: 350	I find on the tractor it uses a very similar size pump as a front steer tractor of the same size. It really does not take much effort, yet with no diffs at all and locked axles then it may be require lots of power. The turning radius was always surprisingly better. Another benefit was the tire tracks will make only 2 circles instead of 4, maybe that's not a benefit? The thing I wonder about the most is the outside wheelbase going long and the vehicle tipping over.:?

12-19-2005, 08:21 PM	#9
halfcab RCC Addict Join Date: Oct 2005 Location: rite here all along Posts: 1,888	with the axles locked it would be very hard to steer, the inside track compared to the outside track would cause the truck to hop really bad as the tires fight each other for traction, just like a 1:1 truck locked up front and rear hops on granite, you could try it but I don't think it would work very well, just my .02. if you could make the f/r really tight limited slip units it could work.

12-19-2005, 08:43 PM	#10
Cubman Rock Crawler Join Date: Nov 2005 Location: Oak Ridge Posts: 590	Looks like it uses a standard size servo...

12-19-2005, 10:13 PM	#11
floogldood Quarry Creeper Join Date: Nov 2005 Location: Planet Earth Posts: 350	Hey there it is, that one steers everywhich way. Do you think it would have the stability with the varying wheelbase? I think it may be easier because at least the front and rear axles would be going the same distance (kinda like front/rear steer does)

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