RE: Nitro Rock Crawlers Only

RE: Nitro Rock Crawlers Only
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RE: Nitro Rock Crawlers Only - 2/2/2007 7:39:44 PM

Anomie

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From: Livermore, CA, USA
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quote:

ORIGINAL: crawlercrazed

I am currently building a ground up rc nitro rock crawler. i have tlt axles ( the plastic stock housing i plan to upgrade to aluminum later) with the 2.2 axle widener kit, 4 wheel steering, 4 links from a monster truck chassis kit and a scale chassis from crawlerstore. i plan on running either a .12 or .15 nitro engine with a cooling fan to a stampede tranny (geared low) with an airplane gas tank. the engine would be on the back side of the chassis like a monster truck and everything else in the front. i wanna run the gmade wheel and tires from the spider on it as well. since the chassis it self is 15 inches long i plan on cutting it down to 12 so my axles have clearence and not hit the chassis at all. my point of concern is while crawling at weird angle will the engine stall???

It sounds like you have a good plan there. Post some pictures here as you make progress.

Dogman is right. If you use an airplane fuel tank your fuel flow will be ok in any position. You shouldn't have a problem running the engine at odd angles.

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Post #: 151

RE: Nitro Rock Crawlers Only - 2/16/2007 3:39:43 AM

crawlercrazed

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From: livonia, MI, USA
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yea so ive been on the web for more ideas and ive decided to go with tubular chassis that resembles a sand rail along with 4 wheel steering and a nitro engine and tlt axles still with a traxxas tranny and clod wheels. i have no clue when ill have pics up tho im waitin for tax money b4 i get to crazed buyin stuff.

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Post #: 152

RE: Nitro Rock Crawlers Only - 2/16/2007 4:51:56 AM

Anomie

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From: Livermore, CA, USA
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That's cool. Do us a favor and post some progress here as you move along. The nitro rigs are few and far between, and I appreciate anyone with some drivetrain ideas and details in this area.

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Post #: 153

RE: Nitro Rock Crawlers Only - 2/19/2007 5:41:40 PM

mechanicalbob

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From: Juneau, AK, USA
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Well it has been awhile scince I have been here. I see the Nitro Crawler builds go on. Some of the issues I have read here are the "roll back" when not on the power. With a planeary gear set you will not have that issue. The only place that might have an issue of roll back is when shifting from forward to reverse. I am getting closer with mine I am on my 5th tranny build I hope this is the one that I like. As for the cooling issue I am going with a Heli cooling setup. It is light weight and effective. I cut about 2-1/2" off of my cooling head. this helps keep the weight down and with the forced air it cools just fine. The other issue is fuel delivery. I was going with a airplane engine but decided to make my own out of sheet metal and use a Perry Pump to feed the engne. Over all my truck is going to be basd on a 2.2 Comp rig, 12.5 WB 12" wide. It has been along road to get Nitro to crawl and there is a long ways to go to make it work right. I will post pictures smetime soon.

Steve

(in reply to Anomie)

Post #: 154

RE: Nitro Rock Crawlers Only - 3/9/2007 8:26:50 PM

Anomie

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From: Livermore, CA, USA
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Thanks for the update, and I'm looking forward to seeing pictures of your work. It seems that there are varying ideas and plans for making a nitro rig operate well, and the variety is intriguing.

The liquid cooling is still progressing for me, and I finally finished the coolant reservoir and have completed most of the machine work on the top and bottom caps. Once that is mounted to the frame, I'll run some plumbing and put up some pictures of the system. The clutch is another story, as I continue to redesign in favor of an engagement similar to a DIG. That may take a while

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Post #: 155

RE: Nitro Rock Crawlers Only - 3/10/2007 12:40:43 AM

dude7422

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From: ERIE , PA, USA
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reiko i see still working on this great ever think of using one of those ceramic mug heater /chillers to cool motor put under the motor mount run off a lipo battery use small spacers to hold motor up just 1mm from the ceramic chiller just a idea

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Post #: 156

RE: Nitro Rock Crawlers Only - 3/10/2007 2:16:27 AM

Anomie

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From: Livermore, CA, USA
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A chiller or Peltier-type cooling is a really efficient method, but I have to challenge myself with the liquid. It is taking forever, but I know it can be made to work reliably.

This is the original radiator I had planned to use, but I have recently decided to use something newer.

I found some interesting cooling system parts that are intended for PCs, but could easily be adapted for other purposes. I'll have some pictures of the reservoir and associated parts as soon as more work is completed.

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Post #: 157

RE: Nitro Rock Crawlers Only - 3/10/2007 2:21:04 AM

hands without shadows

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From: Denfield, ON, CANADA
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quote:

ORIGINAL: Reiko
The clutch is another story, as I continue to redesign in favor of an engagement similar to a DIG. That may take a while

So are you building a clutch which engages at a certain speed or an on/off manual shaft engagment?

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Post #: 158

RE: Nitro Rock Crawlers Only - 3/10/2007 2:47:04 AM

Anomie

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From: Livermore, CA, USA
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I'm actually working on both. I would like a manual on/off, but a stall clutch will not require a radio channel in order to operate. A manual coupling seems like the way to go, so far.

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Post #: 159

RE: Nitro Rock Crawlers Only - 3/10/2007 2:59:08 AM

The Real Dogman

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Hey you guys aren't you forgeting, I already looked into the peltier, and found thats its survivable working temp is too low for nitro engines. Also, That's exactly like what I was talking about just as few posts back

quote:

I am testing a stationary engine for heating from idling long time and high rpm under load. so we will see what develops from that testing. But wouldn't it be cool to set up a water cooled head using a computer water cooler setup on a truck(I know, I Know, what about the wieght) Maybe not practical, but cool!!

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Post #: 160

RE: Nitro Rock Crawlers Only - 3/14/2007 8:40:16 PM

Anomie

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Yes, the Peltier would have been an interesting system, but after learning of the info you provided, it appears to be inadequate to the task. I'm hoping the liquid will be effective. I think just the surface area of the radiator and lines will provide plenty of transfer.

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Post #: 161

RE: Nitro Rock Crawlers Only - 3/15/2007 6:08:26 AM

RC-Archer

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From: Telluride, CO, USA
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So I just read thru this entire thread and I think that you just missed a way to run nitro in your crawlers. The worlds greatest crawlers on the face of Earth uses this technology and have been using this technology for the last 50 years. Now this technology is being used in cars and is called "hybrid power" I'm refering to Diesel Locomotives and Hybrid cars.

The way the system here works is that you have the gas/nitro/diesel engine run a generator and you use the power from the generator to run your electric powered chassis. Hook up a 550 motor to the nitro engine and use it to generate power for the 550 motor in your chassis. I would use two throttles, one for the engine and one for the ESC.

This how the mighty 3000 hp diesel locomotives work to crawl at a snails pace. THe simplicity of this method is that you don't have to have a fancy clutch or reverse transmission or braking system. And it is a perfect way to convert the high horsepower of your nitro engine into usable torque for your crawler.

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Post #: 162

RE: Nitro Rock Crawlers Only - 3/18/2007 11:02:38 PM

subyman

Posts: 65
Joined: 1/19/2005
From: Benton, IL, USA
Status: offline

quote:

ORIGINAL: RC-Archer

So I just read thru this entire thread and I think that you just missed a way to run nitro in your crawlers. The worlds greatest crawlers on the face of Earth uses this technology and have been using this technology for the last 50 years. Now this technology is being used in cars and is called "hybrid power" I'm refering to Diesel Locomotives and Hybrid cars.

The way the system here works is that you have the gas/nitro/diesel engine run a generator and you use the power from the generator to run your electric powered chassis. Hook up a 550 motor to the nitro engine and use it to generate power for the 550 motor in your chassis. I would use two throttles, one for the engine and one for the ESC.

This how the mighty 3000 hp diesel locomotives work to crawl at a snails pace. THe simplicity of this method is that you don't have to have a fancy clutch or reverse transmission or braking system. And it is a perfect way to convert the high horsepower of your nitro engine into usable torque for your crawler.

Why not just use a battery then?

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Post #: 163

RE: Nitro Rock Crawlers Only - 3/19/2007 5:45:55 AM

Anomie

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From: Livermore, CA, USA
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I had considered a hybrid rig before deciding to use strictly nitro propulsion. I still plan to use a generator for some of the electronics, but not electric motors. I suppose most of the drive to use nitro is the difficulty to make it reliable and capable as a crawler.

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Post #: 164

RE: Nitro Rock Crawlers Only - 3/19/2007 2:25:29 PM

Rat1

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Is anyone going to actually build something or are you guys just going to keep this topic going for a few years?

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