RE: Nitro Rock Crawlers Only

RE: Nitro Rock Crawlers Only
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RE: Nitro Rock Crawlers Only - 3/27/2007 5:46:14 AM

rorannerusan

Posts: 7
Joined: 3/25/2007
From: Pryor, OK, USA
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I do not know It is just ideas and maybe somebody could incorporate something if it could or would work. anyway does anybody know the company that made the three speed or the rock crawling type gearing for the tmaxx? I only seen it once or twice on the net on a website. I believe the kit was only $150 and they advertised deifferent gear ratios. Anybody here of this before?
Thanx Lee

(in reply to dezfan)

Post #: 176

RE: Nitro Rock Crawlers Only - 3/27/2007 5:49:31 AM

Anomie

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From: Liverwurst, CA, USA
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quote:

ORIGINAL: dezfan

quote:

ORIGINAL: rorannerusan

These are just ideas right now. I figured maybe when I get more money I will build a nitro crawler. Here is another thought for realism. The axle assemblies from the Kyosho madforce or nitro version could be setup probably for more realistic crawling looks. As for the clutch I thought about using either a nitro with a longer crank shaft output or a screw on one and a bearing setup to allow the clutch idea to spin with motor rpm essentially a metal plate with a hole for the rod to push and the bearing in front so the plate won't spin and a spacer of some sort to push the clutch piece or pieces together. Here's a thought make the clutch actuating plate bigger then the clutch disk on nitro engine. When the throttle returns to idle being the disk is over sized the metal plate would have a hanger that pull back on the clutch actuating disk. If anyone thinks this will work let me know. Has anyone seen the mod gears for a tmaxx tranny? There was making making a crawling gear setup as well as three speed setup somewhere. I seen that about a year ago and was going to get but could not find the site. As for water cooling why not try a trx pro .15 with a water cooling head. Maybe someone could rig it up to cool with an electric pump some kind of radiator setup and a fan to suck cool air through the radiator fan could be controlled through rpm by some kind of pick up maybe similar to a bicycle speedometer. The clutch idea would need a clutch bell with holes and a flywheel with 2 threaded holes instead of the clutch shoe rods. Just take those out and thread the holes. you would have to make sure the clutch bell holes would line up with fly wheel holes. I saw a setup like this on a nitro monster truck designed for instant movement as you touch the throttle. I was in Hawaii when I saw this on a modded tmaxx and man was it sweet. The guyt set it up for sand drags so that it would go instantly with out wasting nitro meaning less throttle for movement since the clutch grabbed quicker.
Thanx Lee

That all sounds niffy, but w/ all of the thinks you listed, do you really think it will be an effective crawler?

You have a good point Dez, and I have to agree. As an example, if you consider all of the crap going into my build, I think it will be far from effective, and not able to compete. The proven electric-powered crawler is just too capable and straightforward a design, and also enjoys an advantage in ease of repair and maintenance. I really believe that a nitro machine can only be an experiment in patience. Of course, I'd love for someone to prove me wrong on this, but I know for sure that my project, for one, will be hard-pressed to crawl at the level of the comp machines - if at all

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Post #: 177

RE: Nitro Rock Crawlers Only - 3/27/2007 5:57:43 AM

dezfan

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From: Columbia, MO, USA
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Well, if may not be effective, but damn the parts your making sure are nice quality!

I wish I had those machining skills!

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Post #: 178

RE: Nitro Rock Crawlers Only - 3/27/2007 2:29:41 PM

Anomie

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Thanks. We'll eventually see if they actually do something

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Post #: 179

RE: Nitro Rock Crawlers Only - 3/27/2007 2:45:44 PM

savagecommander

Posts: 482
Joined: 1/3/2006
From: sterling heights, MI, USA
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one thing we all have to remember... the more complicated something is the more things can break.... keep it real simple for now... get a working chassis ,THEN come up with all the goodies.... this is really a good project... lots of talent coming out..

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Post #: 180

RE: Nitro Rock Crawlers Only - 3/29/2007 2:29:55 AM

rorannerusan

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Joined: 3/25/2007
From: Pryor, OK, USA
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Here is another idea you could try. I might try this when I get some more money. I thought about using a nitro rustler tranny and setting it up so that both output shafts would spin the same direction no matter whether the front or rear comes off of the ground or not and using the kyosho madforce axles and diffs and locking them. The clutch would be an issue and not having reverse wouldn't probably be a big problem. I really do not know about that but this all just another idea. Maybe somebody could figure out a reverse for this idea.
Thanx Lee

(in reply to savagecommander)

Post #: 181

RE: Nitro Rock Crawlers Only - 3/29/2007 3:00:24 AM

dezfan

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From: Columbia, MO, USA
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The electric version of that tranny is a mainstay in crawling now (Pede-Rustler), By locking the diff you'll accomplish getting the axles to both turn the same direction. This is how it is done in crawling now, and Max Force axles are already in use w/ good success.

The clutch issue has been an issue w/ nitro from the beginning.

And the lack of reverse would be a serious hindrance.

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Post #: 182

RE: Nitro Rock Crawlers Only - 3/29/2007 12:49:00 PM

gasayers

Posts: 130
Joined: 10/14/2004
From: Auckland, SK, NEW ZEALAND
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This topic really intrigues me so I hope you'll take me seriously. I bought an LST2 because of the high/low gear, reverse and ability to drive slower around trees, roots and ramble. Now I want it to go even slower.

1) First the clutch. With the gearing down we need, a standard clutch with very light springs would engage at low revs and the "slip" which is what wears out a clutch would be so close to nil the clutch would last forever. The clutch bell housing would take no force to rotate due to the gearing down and not get hot so bearings would last longer.
2) There are a number of gearboxes out there (Losi lst2, Kyosho etc) already using reverse off the radio.
3) Roll back. A synthetic pad which rubs on the clutch bell would require very little force, again due to gearing, to stop the truck rolling. I was thinking of lifting the pad off the housing as I opened the throttle servo. A synthetic clutch shoe for this would again last for hours.

Then the gearing down should be fairly straight forward after that.
And a slightly rich nitro motor running a good plug runs forever and doesn't get hot at all. I do that a lot already. I even walked off and made a cup of coffee for a friend, walked back, picked up the radio and drove of. He was gob smacked.

Can I ask roughly what the top speed of an electric crawler is? (oh, 5 mph?)
I’m not worried about getting all the articulation you guys use so that’s not an issue for me.

Glen

< Message edited by gasayers -- 3/29/2007 1:00:26 PM >

(in reply to dezfan)

Post #: 183

RE: Nitro Rock Crawlers Only - 3/29/2007 3:56:59 PM

savagecommander

Posts: 482
Joined: 1/3/2006
From: sterling heights, MI, USA
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good ideas.. the pad idea would work, but you can set up your trim on the brake to hold when at 0 throttle..the losi gearbox is good and the clutch info is soo true...

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its funny, he said "I am the dread pirate roberts" long live andre the giant

(in reply to gasayers)

Post #: 184

RE: Nitro Rock Crawlers Only - 3/29/2007 5:22:07 PM

Anomie

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From: Liverwurst, CA, USA
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That is good thinking. A trim of the throttle to keep the vehicle from rolling would do the trick nicely. Until now, I have worked on the clutch issue, and decided not to use one at all. I may later go in the direction of a 6-shoe clutch on the engine combined with a mechanical disconnect after the gear reduction. The clutch would allow the truck to stay in gear, the worm drive will alleviate any unwanted rolling, and the disconnect would allow for an electric reverse off of a one-way bearing.

quote:

ORIGINAL: savagecommander

one thing we all have to remember... the more complicated something is the more things can break.... keep it real simple for now... get a working chassis ,THEN come up with all the goodies.... this is really a good project... lots of talent coming out..

I know it sounds complex, but the unconventional design is far too intriguing for me. This can be done much more simply, but it is the journey that makes the fun.

quote:

ORIGINAL: gasayers

And a slightly rich nitro motor running a good plug runs forever and doesn't get hot at all. I do that a lot already. I even walked off and made a cup of coffee for a friend, walked back, picked up the radio and drove of. He was gob smacked.

That sounds like an awesome demonstration! I also like the idea of the engine naturally running cooler through tuning. Can you tell me what type and size of engine you were operating? I assume it was a 2-stroke, and I think the air-cooled heads on car and buggy engines are more than sufficient when also combined with a fan, but I'll be installing a much larger motor (1 cubic inch) and the air will probably not be enough. I'll push forward with the liquid. The clutch will have to wait until something compels me to alter the design.

This thread keeps rolling along, and it's good to see

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Post #: 185

RE: Nitro Rock Crawlers Only - 3/29/2007 6:43:26 PM

dezfan

Posts: 1290
Joined: 2/15/2006
From: Columbia, MO, USA
Status: offline

Walking pace is about what my crawlers run.

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07 CMRCRC 2.2 Champ / 07 KC 2.2 Mid West Champ / 2 Time USRCCA Qualif

(in reply to Anomie)

Post #: 186

RE: Nitro Rock Crawlers Only - 3/29/2007 6:51:22 PM

Anomie

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From: Liverwurst, CA, USA
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quote:

ORIGINAL: gasayers

Can I ask roughly what the top speed of an electric crawler is? (oh, 5 mph?)

Glen

I have calculated gearing for about 4mph top speed. Seems reasonable.

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Post #: 187

RE: Nitro Rock Crawlers Only - 3/29/2007 7:23:16 PM

gasayers

Posts: 130
Joined: 10/14/2004
From: Auckland, SK, NEW ZEALAND
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quote:

ORIGINAL: Reiko

but I'll be installing a much larger motor (1 cubic inch) and the air will probably not be enough. I'll push forward with the liquid. The clutch will have to wait until something compels me to alter the design.

This thread keeps rolling along, and it's good to see

I'm running a .26ci .427cc Mach 427. (nothing flash there) If it will compel a 13lb monster truck to 40-45mph, allowing for gearing it down to 4-5mph why in the world are you even thinking 1cu????????????????????
A 61 would be too big and an 81 insane.

Even with the standard gearing it’ll easily push the truck up a 70deg incline from stand still or from a standstill light up the tires or from standstill drive up and over a vertical road curb.
The fans a nice idea but probably unnecessary. The engine will run too cool and give flooding problems when idling around.

K.I.S.S.

Cheers
Glen

< Message edited by gasayers -- 3/29/2007 7:29:46 PM >

(in reply to Anomie)

Post #: 188

RE: Nitro Rock Crawlers Only - 3/29/2007 8:13:31 PM

Anomie

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Joined: 4/15/2005
From: Liverwurst, CA, USA
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Well, this truck is already over 21lbs and as of yet has no engine, gearing, electronics, batteries, cooling system, or fuel system. I'm hoping to keep it under 35lbs when complete. Also, I want the engine to be a 4-stroke twin, so the exhaust note through dual stainless mufflers will be realistic. The smallest twin I want to deal with is a Saito 100, and it is an aircraft engine. It is true that a smaller displacement would yield plenty of power, but I have to have some realism

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Post #: 189

RE: Nitro Rock Crawlers Only - 3/29/2007 10:20:26 PM