RCCrawler Forums

CrawlinMike · 02-26-2009, 03:45 AM

This is just an idea for maybe getting that last last little bit of an advantage over the competion. wanted some other opinions and I think this would be about the best place for me to post this thread

microgoat · 02-26-2009, 04:08 AM

It would work until the brushes got dirty, assuming the brushes could take the current. Probably wouldn't work in water for very long.

sweli · 02-26-2009, 04:34 AM

This is one of those project where you have to write down the pros and cons and give them values 1-10.

Difficulty -8
Benefit (weight in tire versus on axle near tire) +6
Cost (not including anger issues LOL) -1
Coolness/originality factor +4
V/A transfer efficiency to ESC -3

Not sure what else to throw at it.

Does anyone make a light enough duty, power transmission device that could be used?
Mcmaster Carr
Grainger
They must use these in machine automation on turntables and such that have sensors mounted out on them.

Mnster · 02-26-2009, 04:39 AM

I've though about it before.

The main disadvantages I came up with were.

1. Torque steer (stall issues) The truck will be all over the place, as it crawls the tires will stall and steer the truck every which way.

2. Having it compact enough to not be in the way of rocks, steering or otherwise.

3. Anchoring them it to the truck.

Of course the advantages were.

1. Super low CG
2. Unlimited clearance.
3. Cut brakes
4. Unlimited steering angle.

Terranaut · 02-26-2009, 08:43 AM

CrawlinMike, there are devices called 'electrical slip rings' which could be used in your idea, if you could find just the right one. Not a simple bolt in fit, but would solve the issues of wear, exposure and efficiency loss though. My opinion is that it could be made to work, but I think not worth the trouble.

I have seen Super crawlers with the batteries wrapped around and under the knuckles. That doesn't require any slip rings or brushes and contacts etc. and offers a lower C of G than puting them inside the wheel. But I don't think you could fit a reasonable sized battery inside a 2.2 wheel.

Mnster, I think you are talking about puting the motors inside the wheels! And that's an idea I also thought of before, and I think that it might be worth the trouble. But I'm sure CrawlinMike is suggesting puting only the batteries inside the tires.

Guys, correct me if I read it wrong.

Cheers.

Ty@Tekin · 02-26-2009, 09:23 AM

It's a cool idea, I did a report for a course in college about a bus that had an electric motor inside each wheel. Would be some crazy custom work, that's for sure.

Nice sig Mike

CrawlinMike · 02-26-2009, 03:13 PM

Well I got some very good opinions and I think this is going to be one of those ideas that get put on the back burner for me. Maybe one of these days i'll bring it back out with a novelty crawler build because even if I can't get it to work the pics would look sweet as homemade cherry pie.

CrawlinMike · 02-26-2009, 03:16 PM

Quote:

Originally Posted by Ty@Tekin

It's a cool idea, I did a report for a course in college about a bus that had an electric motor inside each wheel. Would be some crazy custom work, that's for sure.

Nice sig Mike

Yea I think I got that sig from one of your old posts awhile back. If you mind i'll take it out. Have you ever heard the phrase "imitation is the ultimate compliment" I'm a jeeper

Ty@Tekin · 02-26-2009, 04:55 PM

Quote:

Originally Posted by CrawlinMike

Yea I think I got that sig from one of your old posts awhile back. If you mind i'll take it out. Have you ever heard the phrase "imitation is the ultimate compliment" I'm a jeeper

Not at all, kinda cool you used it! I made it one day when I was bored lol.

Randy P · 02-27-2009, 10:13 AM

It could be done but you're adding a lot of moving contact points that could cause failure. Now wheel mounted gear boxes should be next. They've been used in Unimogs and other serious offroad REAL vehicles for years...

sweli · 03-03-2009, 10:27 AM

RC4WD? they are making a 1:5 scale axle, this could be incorporated as an option?
Who else makes wheels and could machine custom knuckles for 'super' application?

Knuckle would have larger diameter face to accomidate slip ring size.
Slip ring halves, one mounted to knuckle, one ot wheel inner hub.

P1choco · 03-03-2009, 10:54 AM

Check this thread out:
http://www.rccrawler.com/forum/showthread.php?t=107922

02-26-2009, 03:45 AM	#1
CrawlinMike RCC Addict Join Date: Jan 2009 Location: Jacksonville Illinois Posts: 1,049	Too complicated?Just won't work?Or not worth the trouble? This is just an idea for maybe getting that last last little bit of an advantage over the competion. wanted some other opinions and I think this would be about the best place for me to post this thread

03-03-2009, 10:27 AM	#11
sweli RCC Addict Join Date: Jan 2008 Location: Lake Michigan Posts: 1,898	RC4WD? they are making a 1:5 scale axle, this could be incorporated as an option? Who else makes wheels and could machine custom knuckles for 'super' application? Knuckle would have larger diameter face to accomidate slip ring size. Slip ring halves, one mounted to knuckle, one ot wheel inner hub. Last edited by sweli; 03-03-2009 at 10:30 AM.

02-26-2009, 04:08 AM	#2
microgoat I wanna be Dave Join Date: Feb 2005 Location: Cleveland, OH Posts: 8,009	It would work until the brushes got dirty, assuming the brushes could take the current. Probably wouldn't work in water for very long.

02-26-2009, 04:34 AM	#3
sweli RCC Addict Join Date: Jan 2008 Location: Lake Michigan Posts: 1,898	This is one of those project where you have to write down the pros and cons and give them values 1-10. Difficulty -8 Benefit (weight in tire versus on axle near tire) +6 Cost (not including anger issues LOL) -1 Coolness/originality factor +4 V/A transfer efficiency to ESC -3 Not sure what else to throw at it. Does anyone make a light enough duty, power transmission device that could be used? Mcmaster Carr Grainger They must use these in machine automation on turntables and such that have sensors mounted out on them.

02-26-2009, 04:39 AM	#4
Mnster MWRCA'er Join Date: Apr 2004 Location: Machesney Park IL Posts: 3,995	I've though about it before. The main disadvantages I came up with were. 1. Torque steer (stall issues) The truck will be all over the place, as it crawls the tires will stall and steer the truck every which way. 2. Having it compact enough to not be in the way of rocks, steering or otherwise. 3. Anchoring them it to the truck. Of course the advantages were. 1. Super low CG 2. Unlimited clearance. 3. Cut brakes 4. Unlimited steering angle.

02-26-2009, 08:43 AM	#5
Terranaut Quarry Creeper Join Date: Sep 2008 Location: Kuala Lumpur, Malaysia Posts: 372	CrawlinMike, there are devices called 'electrical slip rings' which could be used in your idea, if you could find just the right one. Not a simple bolt in fit, but would solve the issues of wear, exposure and efficiency loss though. My opinion is that it could be made to work, but I think not worth the trouble. I have seen Super crawlers with the batteries wrapped around and under the knuckles. That doesn't require any slip rings or brushes and contacts etc. and offers a lower C of G than puting them inside the wheel. But I don't think you could fit a reasonable sized battery inside a 2.2 wheel. Mnster, I think you are talking about puting the motors inside the wheels! And that's an idea I also thought of before, and I think that it might be worth the trouble. But I'm sure CrawlinMike is suggesting puting only the batteries inside the tires. Guys, correct me if I read it wrong. Cheers.

02-26-2009, 09:23 AM	#6
Ty@Tekin RCC Addict Join Date: Feb 2008 Location: Tekin, ID Posts: 1,940	It's a cool idea, I did a report for a course in college about a bus that had an electric motor inside each wheel. Would be some crazy custom work, that's for sure. Nice sig Mike

02-26-2009, 03:13 PM	#7
CrawlinMike RCC Addict Join Date: Jan 2009 Location: Jacksonville Illinois Posts: 1,049	Well I got some very good opinions and I think this is going to be one of those ideas that get put on the back burner for me. Maybe one of these days i'll bring it back out with a novelty crawler build because even if I can't get it to work the pics would look sweet as homemade cherry pie.

02-27-2009, 10:13 AM	#10
Randy P Pebble Pounder Join Date: Mar 2008 Location: El Dorado Hills, Ca Posts: 132	It could be done but you're adding a lot of moving contact points that could cause failure. Now wheel mounted gear boxes should be next. They've been used in Unimogs and other serious offroad REAL vehicles for years...

03-03-2009, 10:54 AM	#12
P1choco Quarry Creeper Join Date: Jan 2009 Location: El Cajon San Diego Posts: 417	Check this thread out: http://www.rccrawler.com/forum/showthread.php?t=107922

Sponsored Links

RCCrawler Forums

Thread: Too complicated?Just won't work?Or not worth the trouble?