Trail Bomber

[Brake Weight]

I recently picked up a RTR as a slider. This is my second Bomber and I've changed goals. The first was a basher but I didn't really drive it much because of my terrain. So I traded it off and regretted that move. So I waited and found a slider for about the same as I had invested in the first one and scooped it up.

Initially, I've got a cheap 21t motor and a Hobbywing Crawler ESC with a program card. Stretched some 2.2 Ripsaws over some homemade foams on a set of the wide offset RPM Revolvers. On 3s the motor gets hot fairly quick and I'd guess it would've. So I looked around for a CHEAP brushless ESC to handle power and long run times. I've got some 2s 50000mAh and a couple of 3s 3000mAh I want to use for long run times out beating on a trail or walking path somewhere. I found a programmable HPI pull off Flux Rage 80a 4s capable. I'll pair that with a 2650kV 3670 motor. The ESC is in my hands but the motor is in transit. Sensorless cogging shouldn't be too much of an issue because I'm wanting more speed than slow crawling. I'm hoping the 20mm longer can will provide additional torque.



I wanted to change color of the panels without buying new ones or painting these. So I ordered some 'automotive grade' vinyl and wrapped it. This was my first attempt so hopefully I can work the wrinkles on the hood out next time.

Storm Trooper mode



One of the biggest complaints was the turning radius due to the locked front axle. So I got a pull off diff from an SMT ar60 and will install when I get a chance. I also got a set of the Axial kit aluminum links from RCC.

[Brake Weight]

I got the links installed and the open diff installed yesterday. I packed the diff full of grease in hopes of maybe limited slip...nope. But it does well enough.

I always use Royal Purple on everything.

[supra_89t]

I'm interested in how that 3670 motor performs. I've been eyeing that size as an upgrade option.

[Brake Weight]

Me, too.

[slowmethinks]

I currently have a 3300Kv 3660 can and 80A ESC in my Wraith. I mostly trail and a bit of easy crawling. Its fun. But Im about to drop a Mamba X and Roc412 3500Kv sensored in it...

[Brake Weight]

The motor should be delivered today. So I pulled the brushed and got my gears I want for the brushless and didn't realize something. I didn't remember that the Bomber uses a sandwich slipper for the spur and not the bolt on type slipper. I have a steel spur I picked up in a package buy and want to run it.

Has anyone just bolted a spur to the plate behind the slipper plate? It looks to be cast aluminum and not stainless like the slipper plates. Would this hold even hold up? It did center up like it should.



Mocked up.

[Brake Weight]

I've ran it around my yard with the steel spur mounted this way and it has done fine. But I'd like to slow it down slightly so I'll be putting the 64tooth back on.

The $45 ESC I found NOS.
https://www.hpiracing.com/en/part/101712

And the $25 3670 motor.
http://www.banggood.com/Racerstar-36...l?rmmds=search

The ESC has 6mm connectors and I had to retrofit what I had on hand since my LHS didn't have 6mm bullet ends for the motor leads.



I'm liking on these together and the ESC is fairly simple to program. It's just time consuming to do it the long way like the ae-3 is. On 2s it's under a jog maybe. On 3s it's looks like a run. I cut the two way deans off and resoldered a single deans back on or it'd be good for 4s. No need as I'll never want that much and I don't think the stock drivetrain wouldn't handle it.

[Brake Weight]

Slight update. I swapped the 3670 motor out for a 4068. Both are sensorless and labeled as 2650kV. This feels like it has considerably more torque. The motor was a direct fit without any modifying, so that was good. I'll run a few 2s packs through it this week and maybe try a 3s just to see. But I think mission is accomplished as for drivetrain. Aesthetics are next.

[Adidas4275]

Interesting to go open diff for steering.

I noticed massively better steering when I swapped the front dogbones for CVDs and some say the Axial universals have even more range.

I don't think I would give up the massive traction you get with the front mounted battery & locked front end.

I use 1M weight oil in my Yeti XL rear diff and that is close to a limited slip. It gets loose when doing high speed runs, burnouts, powerslides and such.

I know some use bees wax or putty.

[NitroDarwin]

Is open front or rear better for steering? I have heard of monster truck guys putting silly putty in the diffs

[Brake Weight]

Have you ever turned a locked 1:1? Its definitely easier on the drivetrain and will lead to a tighten radius.

[NitroDarwin]

Originally Posted by Brake Weight

Have you ever turned a locked 1:1? Its definitely easier on the drivetrain and will lead to a tighten radius.

I have not, but on other forums (rc monster truck) guys were locking up front diff and not rear

[Brake Weight]

Originally Posted by NitroDarwin

I have not, but on other forums (rc monster truck) guys were locking up front diff and not rear

I think that may be more of a preference especially if they're competing. Landing on a single rear tire with a locked rear would end in cartwells with a bit of throttle. Too little and likewise, I'd assUme.

I put a front open diff for my preference of trailing and light bashing in washouts and the like. Medium to high speed stuff.

[Adidas4275]

My Yeti XL is open both with 1M oil in the rear and it is great at high speed....

My Bomber is locked both front and rear and super easy to traction roll.

Your totally right.


But there is 0 chance I give up the crawling and climbing performance of that locked front end on the Bomber!

It is too good.


But to each his own.

I am enjoying following your build as it is clearly something unique and different.

[Brake Weight]

I've got two Wraiths, a dedicated crawler, and am working on a scaler as well as a 1.9 Wraith. The Bomber fits in between the Wraith and my Exo...sort of.

[Brake Weight]

My wife got a vinyl cutting machine and I've put it to use for myself. First ideas were to make body wraps for the Trail Bomber, but the vinyl I have on hand in the color I wanted sucks at sticking. Looked good at 10-15'.


The programming for this machine allows you to copy/trace images then you can resize and stretch them to suit your wants. I removed a Bomber side panel and heated it so that I could flatten it out. Then scanned it and put it into the program. Then I ordered a small sheet of .040" lexan in hopes this machine would cut it. But it can't do it. Although it leaves a good etch in it. Deep enough that a few good pulls off a hobby knife will allow you to break the lexan on the cut.



So I only had a sheet big enough for two side panels and a strip I will make into a panel for the rear of the cab. Now I have a few more sheets ordered as well as some .030, some .010, and some .007" for experimenting. I'll leave this here for anyone else to have. The Wraith side panel is a HarleyDesigns short panel found here: http://www.harleydesigns.com/index.p...box-templates/ I ripped off his 1" square reference block, too.

[Brake Weight]

New panels in red but I should've done blue.

[smog]

Rig is Lookin good. Makes me want one of those vinyl cutters.

[Brake Weight]

Originally Posted by SMOG

Rig is Lookin good. Makes me want one of those vinyl cutters.

I'm glad she got it.