RCCrawler Forums

icemancrawler · 08-17-2010, 05:16 PM

Now I know they say "Nitros can't crawl" but what if there was a way to make it run off a small can of butane or propane like a forklift or some 1:1 crawlers do. Could that be possible over the next couple days I'm going to research this and update as I gather intel but feel free to help out as of now this is not a build thread but if it is possible it might be.

cave-man · 08-17-2010, 05:28 PM

I think it has more to do with the weight up high, clutch problems, no drag brake etc...etc...etc

diamondbackrc · 08-17-2010, 05:50 PM

Quote:

Originally Posted by cave-man

I think it has more to do with the weight up high, clutch problems, no drag brake etc...etc...etc

this is true, it has nothing to do with the fuel, To high gear ratio. you can use gear redution but u still have the clutch problem. takes to much rpm to engage clutch all the way and trying to stay crawling slow you burn clutches

thomas · 08-17-2010, 06:02 PM

and if you are in one spot for too long it will get really smoky right there and nitro burns your eyes! bad! it might be cool to do though.

Harvo · 08-17-2010, 06:18 PM

Nitro has been done. It's just too stinking annoying

See

cbtu0914 · 08-17-2010, 06:46 PM

It can and has been done, but it's really freaking annoying because it's so loud. Also the clutch causes problems and then you also run into problems with it loading up. E-power rules, and thanks to brushless and lipo it now rules the go-fast scene as well.

xirtic · 08-17-2010, 06:59 PM

Another small thing that makes NITRO unpleasant for crawling is the oily nature of the exhaust. That oily "film" on the rocks cannot be good.

icemancrawler · 08-17-2010, 06:59 PM

Ok so The clutch seems to be the only major problem I'm currently looking around the web for a way to go clutchless if at all possible

Sharkey · 08-17-2010, 08:05 PM

clutchless wont happen, the only way would be to have a torque converter and your not gonna be able to design one for an affordable price. imo the clutch isnt a big issue, a set of dynamite maxlife aluminum shoes with soft springs would work fine. the key is to gear it low enough so the rpm will come up quick and the clutch will lock. drag brake also isnt an issue, have the brake setup to be on when the motor is at idle. this would take some setup to get the timing between the brake releasing and the clutch locking, but its doable.

the biggest issue in my eyes is the weight of the motor, weight of the fuel tank, and cooling. a cooling fan is needed, however it is going to require more than a typical receiver pack to keep going for any amount of time.

im a hardcore nitro guy, dont run anything but, however a crawler is something best left to electric. not for the noise factor, or fuel, the only reason i say this is the low speed control needed and amount of torque at startup is something a nitro motor just cant do.

losikid · 08-17-2010, 10:39 PM

The problem is all the nitro motors were made for speed not torque.

I have an idea what about a manual clutch, instead of centrifugal like they are now i nitro cars. This way you can have a nice slow rpm which will help keep temps down, noise down, and a more controllable low speed.

Once you get a clutch figured out that you can hook up to a servo then design a nitro motor made for torque not speed (I doubt one will be ever made)

Sharkey · 08-17-2010, 11:58 PM

just the size of a nitro engine doesnt lend itself to torque. the best motor would be an old os fs26 4 stroke car engine, they make piles of torque compared to a 2 stroke. another thing would be a .32 axial with a carb restrictor, and a low end tuned pipe. as far as a manual clutch, i still dont think its needed. aluminum shoes with soft springs will work fine.

icemancrawler · 08-18-2010, 12:08 AM

Well I've found that the Revo's tranny is clutchless and that might be some thing. and if it helps the truck in mind is a genisus.

MojaveMonster · 08-18-2010, 11:59 PM

I'm suprized Sharky was the only one to mension it. Smoke and noise, yeah....but the real issue is cooling. Gotta have some speed to keep cool. Same reason motor cycles are allowed to move to the front at a red light, to keep the air flowing over the engine. Trade in your butain experiments for some cooling experiments.

And good luck

NMB2 · 08-19-2010, 12:02 AM

it would be cool to have... but You arent going to reinvent the crawler. Electric is the way to go unless you are just bored and have money burning a hole in your pocket

soundcolor · 08-19-2010, 06:12 AM

The biggest thing to think about is non af the above mentioned stuff...
its more about this,
your never gonn be able to be competative with it.

And i don't mean that you wont win any comps (which you wont)...
But rather that while all your buddies are enjoying a nice day of crawling you'll be adjusting fuel mixtures, playing with clutch settings and running to get more fuel constantly.
What you are basically asking for is to take all of the things that make crawling fun, rip them out of the equation and in their place stick frustration.

Duuuuuuuude · 08-19-2010, 07:08 AM

Quote:

Originally Posted by icemancrawler

Well I've found that the Revo's tranny is clutchless and that might be some thing. and if it helps the truck in mind is a genisus.

Thats because the clutch is on the engine. Every nitro engine I've ever seen is that way.

constantmotion · 08-19-2010, 07:32 AM

Yep...you have to have a clutch or the truck will never stop.

losikid · 08-19-2010, 10:16 AM

Quote:

Originally Posted by MojaveMonster

I'm suprized Sharky was the only one to mension it. Smoke and noise, yeah....but the real issue is cooling. Gotta have some speed to keep cool. Same reason motor cycles are allowed to move to the front at a red light, to keep the air flowing over the engine. Trade in your butain experiments for some cooling experiments.

And good luck

Do some compressed air. Put a small air pump on it.

Also a fuel pump would be good too. And don't forget the alternator. Only way to make this work is to make it as idenical to 1:1 crawlers. So it would have to be a scaler.

desertmaxx · 09-05-2010, 08:25 PM

Quote:

Originally Posted by cave-man

I think it has more to do with the weight up high, clutch problems, no drag brake etc...etc...etc

i have a nitro crawler and it goes up and over rocks like a charm. NO problems whats 'o' ever.

hende · 09-05-2010, 08:40 PM

Quote:

Originally Posted by desertmaxx

i have a nitro crawler and it goes up and over rocks like a charm. NO problems whats 'o' ever.

done any comps yet?

08-17-2010, 05:16 PM	#1
icemancrawler Quarry Creeper Join Date: Feb 2010 Location: muskegon Posts: 270	Nitro Crawler Now I know they say "Nitros can't crawl" but what if there was a way to make it run off a small can of butane or propane like a forklift or some 1:1 crawlers do. Could that be possible over the next couple days I'm going to research this and update as I gather intel but feel free to help out as of now this is not a build thread but if it is possible it might be.

08-17-2010, 05:28 PM	#2
cave-man Quarry Creeper Join Date: Dec 2009 Location: Oregon Posts: 232	I think it has more to do with the weight up high, clutch problems, no drag brake etc...etc...etc

08-17-2010, 06:02 PM	#4
thomas Rock Crawler Join Date: Jul 2009 Location: boise Posts: 587	and if you are in one spot for too long it will get really smoky right there and nitro burns your eyes! bad! it might be cool to do though.

08-17-2010, 06:18 PM	#5
Harvo I wanna be Dave Join Date: Mar 2008 Location: In the Dark Edges of your Mind Posts: 6,386	Nitro has been done. It's just too stinking annoying See

08-17-2010, 06:46 PM	#6
cbtu0914 Pebble Pounder Join Date: Dec 2006 Location: Weatherford Posts: 104	It can and has been done, but it's really freaking annoying because it's so loud. Also the clutch causes problems and then you also run into problems with it loading up. E-power rules, and thanks to brushless and lipo it now rules the go-fast scene as well.

08-17-2010, 06:59 PM	#7
xirtic RCC Addict Join Date: Jan 2008 Location: Mount Juliet Posts: 1,287	Another small thing that makes NITRO unpleasant for crawling is the oily nature of the exhaust. That oily "film" on the rocks cannot be good.

08-17-2010, 08:05 PM	#9
Sharkey Rock Crawler Join Date: Sep 2009 Location: Abbotsford BC Posts: 563	clutchless wont happen, the only way would be to have a torque converter and your not gonna be able to design one for an affordable price. imo the clutch isnt a big issue, a set of dynamite maxlife aluminum shoes with soft springs would work fine. the key is to gear it low enough so the rpm will come up quick and the clutch will lock. drag brake also isnt an issue, have the brake setup to be on when the motor is at idle. this would take some setup to get the timing between the brake releasing and the clutch locking, but its doable. the biggest issue in my eyes is the weight of the motor, weight of the fuel tank, and cooling. a cooling fan is needed, however it is going to require more than a typical receiver pack to keep going for any amount of time. im a hardcore nitro guy, dont run anything but, however a crawler is something best left to electric. not for the noise factor, or fuel, the only reason i say this is the low speed control needed and amount of torque at startup is something a nitro motor just cant do.

08-17-2010, 10:39 PM	#10
losikid Got Worms? Join Date: Jun 2009 Location: Golden, CO Posts: 6,116	The problem is all the nitro motors were made for speed not torque. I have an idea what about a manual clutch, instead of centrifugal like they are now i nitro cars. This way you can have a nice slow rpm which will help keep temps down, noise down, and a more controllable low speed. Once you get a clutch figured out that you can hook up to a servo then design a nitro motor made for torque not speed (I doubt one will be ever made)

08-17-2010, 11:58 PM	#11
Sharkey Rock Crawler Join Date: Sep 2009 Location: Abbotsford BC Posts: 563	just the size of a nitro engine doesnt lend itself to torque. the best motor would be an old os fs26 4 stroke car engine, they make piles of torque compared to a 2 stroke. another thing would be a .32 axial with a carb restrictor, and a low end tuned pipe. as far as a manual clutch, i still dont think its needed. aluminum shoes with soft springs will work fine.

08-18-2010, 12:08 AM	#12
icemancrawler Quarry Creeper Join Date: Feb 2010 Location: muskegon Posts: 270	Well I've found that the Revo's tranny is clutchless and that might be some thing. and if it helps the truck in mind is a genisus.

08-18-2010, 11:59 PM	#13
MojaveMonster Newbie Join Date: Jun 2008 Location: Barstow Posts: 37	I'm suprized Sharky was the only one to mension it. Smoke and noise, yeah....but the real issue is cooling. Gotta have some speed to keep cool. Same reason motor cycles are allowed to move to the front at a red light, to keep the air flowing over the engine. Trade in your butain experiments for some cooling experiments. And good luck

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08-19-2010, 12:02 AM	#14
NMB2 Newbie Join Date: Nov 2008 Location: Albuquerque Posts: 29	it would be cool to have... but You arent going to reinvent the crawler. Electric is the way to go unless you are just bored and have money burning a hole in your pocket

08-19-2010, 06:12 AM	#15
soundcolor Rock Crawler Join Date: Mar 2009 Location: Cottontown Posts: 880	The biggest thing to think about is non af the above mentioned stuff... its more about this, your never gonn be able to be competative with it. And i don't mean that you wont win any comps (which you wont)... But rather that while all your buddies are enjoying a nice day of crawling you'll be adjusting fuel mixtures, playing with clutch settings and running to get more fuel constantly. What you are basically asking for is to take all of the things that make crawling fun, rip them out of the equation and in their place stick frustration.

08-19-2010, 07:32 AM	#17
constantmotion On the lookout for Rocks Join Date: Mar 2006 Location: Monroe, Louisiana Posts: 3,711	Yep...you have to have a clutch or the truck will never stop.

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