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Old 10-04-2018, 09:23 AM   #141
Rock Crawler
 
Join Date: Oct 2012
Location: Medina
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Default Re: Wraith based Rock Bouncer

Quote:
Originally Posted by Crawler Cads View Post
I have a Castle 1410-3800 in my Bomber with 64/10 pinion spur, stock diffs.
Runs like a dream on 3s, good low down and I never get to top speed (due to skill more than environment!).
Had a really good forest blast the other day and didn't get hot at all which was a really pleasant surprise
Have you tried a wider pinion spur ratio to see if you can keep that motor in? Might save you some $$

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I sure have. 56T Spur in metal gear seems to be about the max. And on, the 4100kv PullerPro, 11t is the lowest available pinion.



Like I said, it's no big deal because I can use that motor in the Baja Rey.
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Old 10-12-2018, 08:12 AM   #142
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Default Re: Wraith based Rock Bouncer

Well, I've decided to go with something a bit different. Just ordered up a Holmes Hobbies 1800kv Revolver. I really like what I'm hearing about these motors in terms of their torque and throttle resolution. About as close as you can get to brushed in that regard while still going brushless. I'll post up my impressions after I get it installed and do some shakedowns.
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Old 10-13-2018, 03:32 PM   #143
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Default Re: Wraith based Rock Bouncer

Look what I got in the mail today. Got it mounted, but I need a new pinion before I can get everything buttoned up and go out for a shakedown run.
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Old 10-14-2018, 06:46 AM   #144
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Default Re: Wraith based Rock Bouncer

I was digging through my tool box and parts last night. I was positive I had an extra 10or 11 tooth pinion somewhere. Sure enough, I found a new in the bag 10T that I had completely forgotten about. I got that installed on the motor and the rest of the rig buttoned up at about 11:00pm last night.

Turned on the LEDís and took her out for a quick rip.

First impressions: the start up is so darn smooth! The Holmes Revolver really does feel alot like a brushed set up. Gobs of torque with a very smooth curve too. It was only a quick, 5 minute run around the front yard and my little side trail, but this thing already has me considering Revolvers for my other rigs.

The only change I think iím going to make is to move up to an 11, or possibly even a 12 tooth pinion for some extra legs. With the 43/13 ring and pinions in both pumpkins, I think iíll still be well within range.

Oh yeah, and it sounds like a freakín SPACESHIP too!
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Old 10-14-2018, 03:35 PM   #145
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Default Re: Wraith based Rock Bouncer

Chased a lot of little Gremlins on this sucker today, but man is it sorted now! I kept doing my little "rock racer" loop in the side yard and slowly tweaking things. So happy with it now. In summary:

1. I had some side to side slop with the Incision lockers in the pumpkins. It was allowing one or the other axles to disengage from the locker and free spin. No Bueno. I ended up cutting down some high density plastic tubing to run on either side of the locker/bevel gear in the pumpkin to keep it centered, and thereby keep the tabs on the axles fully engaged in the locker. Looks like problem solved there!

2. Now that I've gone to a more reasonable, lower speed power plant, I decided to throw the Yeti Aluminum trailing arms back on. However, the Traxxas Ultra shock ends were too wide to fit within the trailing arm shock mounting points. I played around with some end combos from other shocks, but most of the spring cups didn't sit quite right and I was just not liking it. Again, No Bueno. So, I dug the Internal Spring units back out and really dicked with them in terms of the Spring selection (3 different to chose from), and the oil weight (ended up going 35W), and finally mounting position. After several laps on the little course and some different mounting points, I finally got them right where I want them. I have to say they feel pretty amazing right now. Really surprised I got them there because lord knows I played with them quite a bit prior and just couldn't get them sorted. Apparently the blind squirrel does find a nut on occasion!

3. I would have liked to play around with Castle Link for a bit just to play with some curves for the Revolver. (My Lap Top is down and apparently the Castle Link software is not compatible with a Surface Tablet) That said, it does feel sweet right outta the bag. I am thoroughly impressed with this Holmes Hobbies 1800kv Revolver! If you've been on the fence about trying one of these motors, jump off now! Especially if you like the feel of a brushed set up, but prefer brushless. In the immortal words of Van Halen (Hagar) I WANT THE BEST OF BOTH WORLDS!

4. Lastly, the 10T pinion works well, and motor temps were a complete non issue. So, I will be picking up an 11T and 12T pinion in an effort to get a little bit more on the top end.

It's kinda funny how this rig has evolved. What started out as a crazy Rock Bouncer with stupid parts busting power and speed, is now more of a rock racer / rock crawler package. I've had a lot of fun working on it though and I'm pretty pleased with its current configuration. I'm going to keep tweaking it and testing it, and will continue to post updates. Next up is a new hi torque servo since this got a parts bin special when the project started. I think I'm also going to throw a set of Hyrax tires on her! The Show Downs were great for Rock Bouncer trim and slinging mud and loam, but they wallow a bit on the rocks and in cornering.
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Old 10-18-2018, 03:40 PM   #146
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Default Re: Wraith based Rock Bouncer

I got the ProLine Hyrax tires spooned on today. Did a quick loop on the side trail and some crawling on the back rocks. I'm really liking them straight away. My run ended prematurely when the rod end for my drag link stripped out. Ordered up an Incision stainless drag link and tie rod kit to replace the old STRC stuff.

I also ordered up a new, "off-shore" Hi Torque servo to replace the parts bin unit I've been running. After reading the "what's the new cheap servo hotness" thread, I decided to give the DS Servo model DS3225 waterproof hi-torque unit a try. I'll be interested to see how well this servo works, and more importantly, how it holds up. I figure for $17 shipped, it's definitely worth a shot.

I cut and pasted the specs below from @Durok's post over in that thread.

Electrical Specification
Operating voltage range: 4.8 - 6.8V
Operating speed ( 5.0V ): 0.15 sec/60 degree
Operating speed ( 6.8V ): 0.13 sec/60 degree
Stall torque ( 5.0V ): 21kg/cm
Stall torque ( 6.8V ): 25kg/cm

Control Specification:
Control System: PWM(Pulse width modification)
Pulse width range: 500~2500 μsec
Neutral position: 1500μsec
Running degree: 180į (when 500~2500 μsec)
Dead band width: 3 μsec
Operating frequency: 50-330Hz
Rotating direction: Counterclockwise (when 500~2500 μsec)

Mechanical Specification:
Gear ratio: 275
Bearing: Double bearing
Connector wire: 17.7inches(450mm)
Motor: 3-pole(s)
Waterproof performance: IP66

Package:
1 x DS3225MG Digital Servo
1 x 25T Adjustable metal servo arm
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Old 10-18-2018, 03:43 PM   #147
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Default Re: Wraith based Rock Bouncer

Let us know how it fits. That servo seems a bit bigger than most.

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Old 10-18-2018, 04:33 PM   #148
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Default Re: Wraith based Rock Bouncer

Will do Steve g. I scoped out the side by side comparison pics that @Durok took. Fingers crossed she'll slip right in.
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