Wheel Weights! - Page 3

chilli_mp138 · #31 07-11-2005, 10:34 AM

micro_rc_guy--

I began a tutorial on a basic regearing mod, and have in the works a more extensive regearing I'll add to the existing tutorial. What I intend to add follows on the mod made by Steve (see elsewhere in this thread).

I'll shoot the images this morning and write the tutorial over lunch. Hopefully, you can see it this evening. Look at www.gcrossett.com/zipzaps/ in the MT mods section.

chilli

micro-rc-guy · #32 07-11-2005, 05:44 PM

Sweet as ,
nice one man , im getting a zzmt soon and i want to make it into a crawler , im going to make some suspension to improve the stock , i was thinking multi-link and making it 2wd from the rear.
Not sure if i could scratchbuild multi-link though , allthough looking at the TTTT people i think if it was just rear wheel drive , I could scartchbuild one of their front rotating axles.Id love to get into some further discussion with you about rock crawling / trailing like the tttt's do . if you have msn then it would be cool to chat @ joefullager_717@hotmail.com
or aim : joefullager

many thanks ,
J03 !

EDIT : i just looked at the tutorial , it looks great .I dont have the things required though.So i think il have to work out another way of making it slower , allthough i dont want it too slow . But slow enough to rock climb.

micro-rc-guy · #33 07-13-2005, 05:19 AM

YEEEAAAAHHH !!

My zzmt is almost on its way from America to New Zealand.
With the motor an gearing set , and possibly a kokam 145mAh lithium polymer .Any other ideas rather than gearing of making mine slower without doing that gear mod ?. Id love to but im not so confident to try it on my first and only zzmt wich i have had to trade for a digi-q formula just to get it .

So if anyone gets any ideas other than whats been posted ( wheel weights , gearing )please let me know .

Steve · #34 09-23-2005, 06:58 PM

Please let us know if you come up with anything for the suspension, innovation is just plain exciting...even if it doesn't always work.

ES0 · #35 10-09-2005, 05:07 PM

I'm new here so I don't know everything.

I do know that torqe comes from gearing, and an electric motor has maximum torque virtualy immediately at connection to power.
That being said. If you put a fast motor geared down to 255:1 or 355:to1 or 72:1 all you should really be changing is the rotational speed of the gears and wheels.

Therefore; gear it way down as low as you can go and put a motor with maximum rpm's into the chasis.

Instead of weighting the wheels or nose put a 'wheelie bar' on the back and a bashplate on the front.

When I am finished with mine I'll post pics.

I love this place!

ES0 · #36 10-09-2005, 05:09 PM

Has anyone done any kind of torque testing on the ZZMT motors that would be very interesting.

Steve · #37 10-10-2005, 05:42 PM

Quote:

Originally posted by ES0
I'm new here so I don't know everything.

I do know that torqe comes from gearing, and an electric motor has maximum torque virtualy immediately at connection to power.
That being said. If you put a fast motor geared down to 255:1 or 355:to1 or 72:1 all you should really be changing is the rotational speed of the gears and wheels.

Therefore; gear it way down as low as you can go and put a motor with maximum rpm's into the chasis.

Instead of weighting the wheels or nose put a 'wheelie bar' on the back and a bashplate on the front.

When I am finished with mine I'll post pics.

I love this place!

ummmm... kind of. Without any kind of gears at all, the general rule is the higher the RPM a motor generates, the less torqe it has. The theory also works in reverse... low RPM = more torqe. SO, with something geared as low as 355:1 or better, torqe is generally not an issue because the gearing helps to overcome the high RPM motor's lack of torqe. What high RMP motors lack in torqe, they generally make up for in..well...RPM's. High RPM's = Speed. SO, gearing really low, and dropping in a high RPM motor just means your crawler moves slightly faster, but with less power. Using a low RPM motor means it moves slightly slower, but has more power. It's all about balance...which leads into...

Wheel weights, the only purpose is to lower the trucks center of gravity, making it less likely to roll over. To do so, I wanted the weight as low to the ground as possible, and as far to the outside of the stance as possible. Putting heavy bash plates underneath was one thought, but while it looks cool, it will negatively affect the ground clearance. There isn't much lower or wider than the wheels. Putting weight in there makes a huge difference in the stability of the truck.

Wheelie Bar on Monster Truck... yikes.

ES0 · #38 10-10-2005, 09:55 PM

I'm quite litreally spaztic. Had a rough couple of years, so that's my way of controling backflips without killing maximum runtimes.

I just love the Stadium Truck look and feel, my 'zzMT' won't ever look or act like an outside truck. As is it goes farther and faster than I can.

Thanks for all of your input, but try to accept my wheelie bar. I wish I had one.

chilli_mp138 · #39 10-11-2005, 09:12 AM

ESO--

A search of the forums should find you the plans for a wheelie bar--there are a number of them out there. I built one from brass bar and rod--the tutorial is on my ZZ website at www.gcrossett.com/zipzaps/.

I've also begun a tutorial on a slow ZZ MT driven by a modified ZZ SE steering servo. The mod deepens the motor well slightly, builds spacers for the servo, and retains the MT's stock gears. The tutorial should be up on my site in several days.

chilli

ES0 · #40 10-11-2005, 09:53 PM

Thanks for rhe reply, it's really cool to get this kind of help and interesting conversation. Keep up rhe good works

SamDrummerBoy · #41 10-12-2005, 10:06 PM

Steve, here is a dumb question... I have noticed that I get the most torque from whatever the fastest motor and the lowest gear ratio, whether its x-mods (can I say that here?) zz or zzmt. Aren't there other factors? I am just asking tell me if I am wrong. The motor is based on magnets and windings. In my own experience they aren't inversly proportional. It seems that the faster motors actually have more torque. Is it just me?

Steve · #42 10-13-2005, 03:03 PM

Quote:

Originally posted by SamDrummerBoy
Steve, here is a dumb question... I have noticed that I get the most torque from whatever the fastest motor and the lowest gear ratio, whether its x-mods (can I say that here?) zz or zzmt. Aren't there other factors? I am just asking tell me if I am wrong. The motor is based on magnets and windings. In my own experience they aren't inversly proportional. It seems that the faster motors actually have more torque. Is it just me?

I'm certainly no motor expert, but all other things being equal, a higher RPM motor almost always has less torque than a lower one. I'm not sure what you are using to measure torque, but pulling power, and climbing ability are two easy ways to test. When testing, keep the gear ratio the same. Put in the high RPM motor and try to pull something just heavy enough to stall the motor, Then try the lower RPM motor, and compare. While the High RPM motor might pull a light load faster, the lower RPM motor should be able to pull MORE weight.

rfnagel · #43 10-14-2005, 12:17 AM

I dunno about the MT motors, but RS has an old page still up on their web site showing that (unlike popular belief) the regular ZipZaps motors of higher RPMs had more torque than the lower RPM motors. Unfortunately that page is quite outdated, it doesn't list the orange or purple ZipZaps motors.

Again, dunno about the MT motors though. One thing, all of my MT Zappin' is out in the woods in my current locale, mostly over pine needles and forest-type ground cover. I always use the fastest RPM motor and the lowest gear ratio... seems to work a bit better than using the slower RPM motors (at least to me).

(Edit) P.S. I recently had delivered 2 tons of pine and oak wood chips (from the power company guys that were trimming trees that had grown into the power lines). I am currently in the process of spreading them around my shack by hand with a *confounded* infernal garden rake <LOL>, and am quite curious to see how well the stock monsters tackle the wood chips (wood chips akin to the MT WinDoZe wallpaper that RS has over at zipzaps.com <G>).

(Edit #2) Almost forgot, the link to the afore mentioned old RS web page -> http://support.radioshack.com//suppo.../zz-motors.htm

Steve · #44 10-14-2005, 03:42 PM

OUI! Then perhaps I stand corrected. From my experience, electric motors, like you also said, are simply magnets and wraps of wire... essentially electromagnets. The more winds of wire, the more powerful the motor and the lower the RPMs. Really fast motors have very few winds of wire, and generate a lot of RPMs, but lack low range power. Of course, it gets crazy with the amount of voltage supplied, the gearing, the load on the motor...

SO, pull something dammit, and let me know what the deal is. Numbers and graphs are all fine and good, I'm curious about real world results!

SamDrummerBoy · #45 10-14-2005, 08:03 PM

I was hoping that I was wrong. I want to find a high torque motor. More than what is available from rs. Has anyone found a way to change magnets or anything? Maybe you could pull the manets out of a fast motor and put them in a torque wound motor. (similar to the "spin brush" idea in xmods.) Does anyone have any way of testing magnetic strength? I don't. I would love to know if that could be done. I just hate to waste motors if it can't.(Don't get me wrong I will if noone can messure magnetic stength on the motors.)