RCCrawler Forums

flowingmotion · 06-28-2010, 02:18 PM

I've been kicking around the idea of a shorter wheelbase rig. I did a search that did not turn up much but I assume you some of you guys have done it.

What are some drawbacks to shortening it up? So far I can see you'll have a bit less articulation, possibly a higher cog under some conditions, harder to climb obstacles of a certain height. On the plus side, less likely to get stuck on the belly and better turning radius.

I've seen some builds with 12" and upper 11" range wheelbase but I was thinking even around 10" or possibly less.

microgoat · 06-28-2010, 02:23 PM

Put some 2.2's on a MRC and see how you like it. I don't think you will.

A shorter wheelbase will be more unstable ascending and descending. The only potential upside would be an improved turning radius, but with dig that's really a non-issue.

flowingmotion · 06-28-2010, 02:35 PM

That's a good idea. By unstable you mean fipping over?

EeePee · 06-28-2010, 02:36 PM

In a comp rig, you're gonna get stuck on those steep climbs.

In the scaler world though, oh man. I just shrunk my SCX-10 down to like 10 1/2 inches to fit a LR3 body and it drives freakin. sah. weet.

So you talking about a comp'r or scaler?

harpua · 06-28-2010, 02:36 PM

A small benefit would be less hanging on the skid...

harpua · 06-28-2010, 02:37 PM

Quote:

Originally Posted by flowingmotion

That's a good idea. By unstable you mean fipping over?

Yes...Endo

EeePee · 06-28-2010, 02:37 PM

Quote:

Originally Posted by EeePee

So you talking about a comp'r or scaler?

Wait, I can answer this. He would have put in the Scaler section if he'd meant scaler...

Maybe.

So my answer reverts back to you're gonna get stuck not making climbs.

flowingmotion · 06-28-2010, 02:42 PM

No I was thinking a comp rig but now that you mention it a scaler would be pretty interesting.

I was thinking bodiless 2.2 comp rig but with a custom chassis and shorter wheelbase but I don't want to reinvent the wheel or go through the all that effort to build a turd.

toyofast · 06-28-2010, 02:53 PM

If you're just looking for a better turning radius, use dig and/or have the rear axle narrower than the front. Only downfall to that is a possibility of it being a bit less stable on an off camber situation.

rmdesignworks · 06-28-2010, 03:42 PM

worst thing that can happen if you try it is youll come in last place,,,,then you can only go up.

Krakker · 06-28-2010, 05:27 PM

It's been done, and I have done it. My Fun Buggy project was a scale-ish Bastard jr. tuber, it runs droop but is very well ballanced and works awesome. Still tho, like Eee Pee said, climbs can be hindered with out the extended wheel base.\
the rig could compete on courses where there's a lot of off camber and sharp turns, but grabbing the ledges of courses that are set up for 12.5" crawlers is it's down fall.
1st pic shows the rig.
2nd pic shows why it can't cut it.

flowingmotion · 06-28-2010, 06:06 PM

Quote:

Originally Posted by Krakker

It's been done, and I have done it. My Fun Buggy project was a scale-ish Bastard jr. tuber, it runs droop but is very well ballanced and works awesome. Still tho, like Eee Pee said, climbs can be hindered with out the extended wheel base.\
the rig could compete on courses where there's a lot of off camber and sharp turns, but grabbing the ledges of courses that are set up for 12.5" crawlers is it's down fall.
1st pic shows the rig.
2nd pic shows why it can't cut it.

That's very similar to what I was thinking. Thanks for the info.

flowingmotion · 06-28-2010, 06:08 PM

Quote:

Originally Posted by rmdesignworks

worst thing that can happen if you try it is youll come in last place,,,,then you can only go up.

Good point. Maybe this year I'll go for most improved.

jimmyb · 06-29-2010, 03:13 AM

what chassis is that?

STEEL_CITY_CRAWLER · 06-29-2010, 10:57 AM

Quote:

Originally Posted by jimmyb

what chassis is that?

first line of his post....

Quote:

Originally Posted by Krakker

...My Fun Buggy project was a scale-ish Bastard jr. tuber...

gottorque · 07-05-2010, 08:51 PM

my creeper is at a 12 in wb right now. I mis cut all of the links and thats where it ended up. Does surprisingly well. I will run it some more before i decide to weather or not to bring it back to the 12.4-12.5 range

06-28-2010, 02:18 PM	#1
flowingmotion Pebble Pounder Join Date: Dec 2009 Location: Earth Posts: 121	Short Wheelbase Concept I've been kicking around the idea of a shorter wheelbase rig. I did a search that did not turn up much but I assume you some of you guys have done it. What are some drawbacks to shortening it up? So far I can see you'll have a bit less articulation, possibly a higher cog under some conditions, harder to climb obstacles of a certain height. On the plus side, less likely to get stuck on the belly and better turning radius. I've seen some builds with 12" and upper 11" range wheelbase but I was thinking even around 10" or possibly less.

06-28-2010, 05:27 PM	#11
Krakker I wanna be Dave Join Date: Nov 2008 Location: Where freedom is earned. Posts: 2,011	It's been done, and I have done it. My Fun Buggy project was a scale-ish Bastard jr. tuber, it runs droop but is very well ballanced and works awesome. Still tho, like Eee Pee said, climbs can be hindered with out the extended wheel base.\ the rig could compete on courses where there's a lot of off camber and sharp turns, but grabbing the ledges of courses that are set up for 12.5" crawlers is it's down fall. 1st pic shows the rig. 2nd pic shows why it can't cut it. Attached Images

06-28-2010, 02:23 PM	#2
microgoat I wanna be Dave Join Date: Feb 2005 Location: Cleveland, OH Posts: 8,009	Put some 2.2's on a MRC and see how you like it. I don't think you will. A shorter wheelbase will be more unstable ascending and descending. The only potential upside would be an improved turning radius, but with dig that's really a non-issue.

06-28-2010, 02:35 PM	#3
flowingmotion Pebble Pounder Join Date: Dec 2009 Location: Earth Posts: 121	That's a good idea. By unstable you mean fipping over?

06-28-2010, 02:36 PM	#4
EeePee MODERATOR™ Join Date: Jul 2004 Location: Ohio Posts: 18,928	In a comp rig, you're gonna get stuck on those steep climbs. In the scaler world though, oh man. I just shrunk my SCX-10 down to like 10 1/2 inches to fit a LR3 body and it drives freakin. sah. weet. So you talking about a comp'r or scaler?

06-28-2010, 02:36 PM	#5
harpua Newbie Join Date: Mar 2009 Location: Western Posts: 30	A small benefit would be less hanging on the skid...

06-28-2010, 02:42 PM	#8
flowingmotion Pebble Pounder Join Date: Dec 2009 Location: Earth Posts: 121	No I was thinking a comp rig but now that you mention it a scaler would be pretty interesting. I was thinking bodiless 2.2 comp rig but with a custom chassis and shorter wheelbase but I don't want to reinvent the wheel or go through the all that effort to build a turd.

06-28-2010, 02:53 PM	#9
toyofast I wanna be Dave Join Date: Feb 2004 Location: Columbia Gorge Posts: 5,512	If you're just looking for a better turning radius, use dig and/or have the rear axle narrower than the front. Only downfall to that is a possibility of it being a bit less stable on an off camber situation.

06-28-2010, 03:42 PM	#10
rmdesignworks I wanna be Dave Join Date: Jan 2006 Location: ...the burning end of the rope. Posts: 5,013	worst thing that can happen if you try it is youll come in last place,,,,then you can only go up.

06-29-2010, 03:13 AM	#14
jimmyb Newbie Join Date: Aug 2007 Location: australia Posts: 34	what chassis is that?

07-05-2010, 08:51 PM	#16
gottorque RCC Addict Join Date: Jul 2009 Location: Ontherocks Posts: 1,980	my creeper is at a 12 in wb right now. I mis cut all of the links and thats where it ended up. Does surprisingly well. I will run it some more before i decide to weather or not to bring it back to the 12.4-12.5 range

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Thread: Short Wheelbase Concept