02-24-2009, 08:56 PM | #1 |
Rock Stacker Join Date: Dec 2008 Location: Eagle Mountain
Posts: 50
| Fresh Meat's CR-01
My first crawler - still a work in progress ;) Electronics: Radio - Futaba 3PM (setup for both 2 and 4 wheel steering) in a Traxxas slash waterproof box. ESC - Mtroniks Viper 20 (already waterproof - but no drag brake ) Front Servo - Integy c22435mg Rear Servo - Hitec 645 Everything else is stock for now. Suspension is all stock for now (stock shocks have not leaked at all yet) - with Jia's mod on the rear. I am still not getting full rear flex yet. Would I be better off removing the canti's and just using the shocks. Should I add internal spring (pen spring with fuel tubing mod)? What about shock oil? Parts in the mail: Junfac heavy duty steering rods, skid plate and front servo plate. Parts that I will be getting soon (don't tell my wife ;): Teken FXR crawler combo or Novak Rooster crawler combo Here it is: Rear Flex: Top Shot - body off, not sure where to mount the power switch yet. Side shot - body off: |
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02-25-2009, 12:15 AM | #2 |
Rock Stacker Join Date: Jan 2009 Location: Winnipeg, Mb
Posts: 84
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Sweet! Wish mine looked that new again LOL! The best place to mount the switch is between the rear body posts but depending where you mount you esc. ;)
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02-25-2009, 12:11 PM | #3 |
RCC Addict Join Date: Sep 2008 Location: Philadelphia, PA
Posts: 1,048
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You did a wicked job on that body, nice work! Don't worry about the flex till you get it moving I say. You can't really experience all the movement it has until you get it out on the rocks. You'll get it in some situations where it will flex plenty. I just bought some new shock oil, 45wt, just to see what happens, it was only like 3 bucks. |
02-25-2009, 02:18 PM | #4 |
Quarry Creeper Join Date: Aug 2008 Location: UK
Posts: 243
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Looks great. I'm starting to consider actually going back to the canti arrangement, having had little success in any configuration I've used recently. I'll be interested to see how your Integy servo copes. The one I bought had smoke coming out of it within 5 minutes of my turning my AX-10 on! On the kitchen floor! Let's see some action pics. |
02-25-2009, 02:44 PM | #5 |
RCC Addict Join Date: Sep 2008 Location: Philadelphia, PA
Posts: 1,048
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BTW, I put my power switch on the rear crossbrace. I just have to reach up under the rear body to turn it on and off. You can see it here in this picture, the little orange square just behind the body post. I don't run the shocks like that anymore though, its back to the cantilever. Keeping it real with Tamiya |
02-25-2009, 04:28 PM | #6 |
Rock Stacker Join Date: Dec 2008 Location: Eagle Mountain
Posts: 50
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That's a good idea - thanks for the suggestion. I will have to wait until I pick up my new ESC before I make any permanent modifications . |
03-01-2009, 01:19 PM | #7 |
Rock Stacker Join Date: Dec 2008 Location: Eagle Mountain
Posts: 50
| Little Moab
Update: I picked up a Tekin FXR Crawler Combo 55T TT2102 from a local hobby shop. My Junfac items arrived on Friday as well. I drove down to a place called Little Moab with my son on Saturday (on the south west side of Utah Lake) and broke it in - which is to say I explored the limitations inherent in my current setup First some action shots (with my 10 year old son driving) And a little video http://www.youtube.com/watch?v=ylPjK_PmdwY |
03-01-2009, 02:09 PM | #8 |
Rock Stacker Join Date: Dec 2008 Location: Eagle Mountain
Posts: 50
| First Run Post Mortem Suspension limitations.... My high COG really seems to be exaggerated by the sloppiness in the cantilever design. I would be slowly climbing over an obstacle and the body would unexpectedly shift from one side to the other causing my rig to roll. I am not ready to toss the cantilever setup just yet, but I would like to find a way to reduce or eliminate the slop. Droop... I was really having a difficult time climbing up the crack, I couldn't get through certain sections because I did not have enough droop. Is there any way to increase droop without ditching the cantilever setup? Tire limitations... the stock tires do very well on packed dirt (look at the first climb on the video) - but they do not grip very well on smooth rock (second clip of video - I initially tried climbing to the left but was just spinning). I will be taking this rig down to Moab next month so I will need to pickup some tires that grip better on sandstone. High COG I don't want to do too much here, I will probably get a battery plate and mount the battery up on the front axle. I will also need to add some weights to the wheels. The front servo (Integy c22435mg) held up very well - this thing is solid. The rear servo (Hitek 645) actually stripped a gear. I will replace the gear and see if this was just a fluke. I think that I would like to try running the front servo with a BEC The Tekin FS R and 55 turn motor are great. Lots of usable torque (see first climb on video). That being said, I need to make a couple of adjustments.. 1) I need to increase the drag brake a bit. This should be pretty easy, I just need to decipher the cryptic instructions in the manual 2) I need to make an adjustment so I can go into reverse a little faster. I found myself going up a steep incline a couple of times and could see that I was about to tip backwards. I would try to reverse to keep from rolling, but it would just brake initially and not reverse and I ended up rolling over backwards. :-( As for 2 wheel steering vs 4 wheel steering - I generally would just use 2 wheel steering. The only time that I would switch over to 4 wheel steering was when I needed to make tight turns. |
03-02-2009, 09:35 PM | #9 |
Rock Stacker Join Date: Dec 2008 Location: Eagle Mountain
Posts: 50
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Well I zip-tied the cantilevers and that did indeed get rid of all of the slop in the suspension. I am still messing around with the rear shock mounting points to see if I can find a spot where I can get full articulation without the cantilevers flipping (locking) when they are fully extended. |
03-03-2009, 05:38 AM | #10 | |
Rock Stacker Join Date: Nov 2008 Location: Philippines
Posts: 55
| Quote:
Cantilever tweaks | |
03-03-2009, 09:21 AM | #11 | |
RCC Addict Join Date: Sep 2008 Location: Philadelphia, PA
Posts: 1,048
| Quote:
Nice! I had the issue of my linkages flipping backwards when I first got my CR-01. It hasn't done it since I changed up my suspension and then put it back to the cantilever set up. The only thing I have different now than when I first got it is aluminum shocks and I put the hard (blue) springs in front and medium (yellow) in the rear. Also I have the soft stabilizer up front where originally I had none, in back is still the medium bar. I don't know what it is, but they haven't flipped in months now. It still flexes really well. A little less than orginally. I can tell because some areas I drive the rig does the 3 wheel thing occasionally where before it would be completely twisted up but all 4 on the ground. I had almost forgotten that it happens until I saw you brought it up happening to yours. The weights definitely help offset the top heaviness. They also get you some more traction down. When its time for new tires (soon) I'm going to add a bit more weight and see what happens. Would like to try the new Tamiya tires, I think they are called Cliff Crawlers. | |
03-03-2009, 03:24 PM | #12 | |
Rock Stacker Join Date: Dec 2008 Location: Eagle Mountain
Posts: 50
| Quote: | |
03-04-2009, 08:52 AM | #13 | |
Quarry Creeper Join Date: Sep 2008 Location: South Glens Falls
Posts: 214
| Quote:
-Jeephead | |
03-04-2009, 09:18 AM | #14 |
RCC Addict Join Date: Sep 2008 Location: Philadelphia, PA
Posts: 1,048
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I don't think the weight in the wheels will hurt. I have 6oz in each front now. You just have to have a strong enough servo to turn that weight on the rocks or you servo will be toast. I've seen my servo struggle a few times if the rig was in an awkward spot and I was trying to turn the wheels. It doesnt happen often though.
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03-04-2009, 09:53 AM | #15 | |
Quarry Creeper Join Date: Sep 2008 Location: South Glens Falls
Posts: 214
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03-04-2009, 11:18 AM | #16 |
I wanna be Dave Join Date: Jul 2008 Location: appleton
Posts: 2,067
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nice hoping mine shows up today worse then a kid in the candy store where the hell is the mail man
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03-04-2009, 02:58 PM | #17 | |
RCC Addict Join Date: Sep 2008 Location: Philadelphia, PA
Posts: 1,048
| Quote:
I have none in the rear wheels currently. I do need something though, its really light in the ass on downhill crawls | |
03-04-2009, 03:22 PM | #18 | |
Rock Stacker Join Date: Dec 2008 Location: Eagle Mountain
Posts: 50
| Quote:
While I am adding weights to my tires I will also need to trim my foam's. Is there a good how-to that anyone can point me to? (Or maybe I will just pick up some proline flat iron tires with memory foam) | |
03-05-2009, 09:25 AM | #19 |
Quarry Creeper Join Date: Sep 2005 Location: Sandy, UT
Posts: 368
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Looks good man! It's cool to see another local CR-01. I've got two of them myself...maybe I should make a thread showing them off some time... |
03-05-2009, 11:17 AM | #20 |
Rock Stacker Join Date: Dec 2008 Location: Eagle Mountain
Posts: 50
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Thanks - it's been a lot of fun. You should create a thread with pics and specs. I always like to see what other people are doing. I picked up some Proline Flat Iron's yesterday (along with some stick-on weights). I really like the scale look of these tires ; I hear that they perform pretty well too. |
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