DenisLM's U4 Bomber build

[DenisLM]

Fixed post with broken pictures of U4 race.

Bonus:
https://vimeo.com/165551077

 

[Terrible1]

I'm curious to hear what gearing you end up liking. I'm running standard HD gears front & rear with 64t spur. I started with 12t pinion and hated it. I'm stuck between 14t & 16t right now. Love the top end with the 16t and haven't noted any concerns with temps. Depending on conditions (bashing or track), I suppose I might see benefits to gearing down for torque.

 

[DenisLM]

I have the underdrive but I'm also using the optional fast gear in the 2 speed, with end in almost the same final ratio as all std gears.
My Yeti used to run 15/64 and was hard to keep it slower and almost never getting full speed, I dropped to 14/64 but didn't tested yet.
The Bomber probably will end with 14/64. if my Yeti (open front and rear diffs) barely can handle all that speed, the Bomber definitely will be way worse.

 

[DenisLM]

After spent the weekend with the 15t pinion, I'm convinced that's the one. I'll try the 14t later just in case.
Also in the Yeti the 14 was bad, went 16 and it's so much fun! (May back to 15 to be more manageable)

And the suspension is doing great even before any extra running in the front shocks. Maybe they are breaking in...

Two slow motion shots give a good feeling of how this shocks works good for the Bomber and even with short travel:

https://vimeo.com/165953309

https://vimeo.com/165953472

Next weekend there's another U4 event and I already have another pack of goodies with SSD Pro knuckles and C-hub, vanquish clamp lockouts and beef tubes U4 aluminum. :twisted:
And PROBABLY (lol) that will be the end of this build. :lmao:

 

[maslin]

And PROBABLY (lol) that will be the end of this build. :lmao:

Keep telling yourself that :lmao:

 

[DenisLM]

Keep telling yourself that :lmao:

yeah, I'm trying to be done with this... :ror:

Other than eventual broken parts, I'm planning in get the clear panels and do a matching paint job with my Yeti. (Wife's job. 8) )
Maybe some extra care in the electronics with the Castle Quick Connect duo. (which I also have in the yeti and is great to check the MMX log after races)
Nothing big anymore :mrgreen:

 

[Terrible1]

Suspension looks to be doing well on the rocks to me. I'm sold on the set up. I was able to do a short run over the weekend and as my crap luck would have it, my brand new Holmes servo locked up. No clue what happened but waiting to hear back from them about it. I ran the 16t pinion and WOW! I think it's a bit much for any U4 track but as a basher, the thing rips on 3s! Thanks for the new vids too!

 

[SCREAMER]

Thanks to the annoying Bomber design that need tear the whole truck apart to change a simple pinion... I'm used to the Yeti, which is fantastic simple to work on

You know, if you would lose the pointless interior, you could do all your tuning without removing a single screw. Adjust mesh, swap pinions, adjust ESC, easy as cake without that interior in the way. Easier to keep everything in there clean too. Hit it with the compressor after a run and she's good to go. Function over form. JMO

 

[DenisLM]

You know, if you would lose the pointless interior, you could do all your tuning without removing a single screw. Adjust mesh, swap pinions, adjust ESC, easy as cake without that interior in the way. Easier to keep everything in there clean too. Hit it with the compressor after a run and she's good to go. Function over form. JMO

Interior is necessary by U4RC rules.
Pointless is also questionable. The whole point of this truck (axials in general) are the "scale looks". I'm by no means one of the guys who spent tons of money only on the scale aspect, but I try to keep what was "built in".
Axial did a great job on the Yeti. they just should kept the good ideas for the Bomber. ;-)

 

[DenisLM]

Suspension looks to be doing well on the rocks to me. I'm sold on the set up. I was able to do a short run over the weekend and as my crap luck would have it, my brand new Holmes servo locked up. No clue what happened but waiting to hear back from them about it. I ran the 16t pinion and WOW! I think it's a bit much for any U4 track but as a basher, the thing rips on 3s! Thanks for the new vids too!

"thumbsup"

16t is definitely a lot of speed, but I'm getting used to how to handle the Bomber with 15t, not as terrible as I expected.
If you thing is just bash, may be a good way to go.

 

[DenisLM]

Yeah, is hard to stop...

Beef tubes aluminum U4 in both axles:

SSD Pro knuckles and c hubs:

Vanquish clamping lockouts:

Now the axles are U4 proof!

Which after another U$ race this weekend the Bomber is back in the podium, 2nd! :mrgreen:
Yeti wasn't that lucky and stayed in 8th... :roll:

 

[DenisLM]

Was cleaning the Bomber and the Yeti after another U4 race (2nd and 1st! ) and took a few pictures of how MMX looks inside:

dirty, very dirty: :ror:

using the motor wires at "right angle":

barely room for the battery mount:

 

[DenisLM]

More slow motion videos because why not? 8)

First a normal speed one:

https://vimeo.com/170671618

And a slo-mo:

https://vimeo.com/170675073

Another one:

https://vimeo.com/170675278

And a rollover, because if didn't rollover isn't a bomber:

https://vimeo.com/170675459

 

[DenisLM]

A lot of little upgrades happened last few weeks, but the major change was move to a new house with some area to build my own mini U4RC track:

<iframe width="560" height="315" src="https://www.youtube.com/embed/OFvPgRQlMRo" frameborder="0" allowfullscreen></iframe>

 

[DenisLM]

And after break the servo mount (the original plastic with some mods) and the SSD c-hubs got loose, the front axle got a second round of upgrades:

All Vanquish now with the servo mount reversed and servo horn modded.
Clamping c-hubs and scale knuckles. Also new truss front and back.

also in process to add some lights to help in some late night fun. 8)

 

[Adamgllc]

is the reverse servo mount to keep the ears from breaking off? What did you have to mod on the servo horn?

 

[DenisLM]

is the reverse servo mount to keep the ears from breaking off? What did you have to mod on the servo horn?

Yes, but more for keep the servo away from direct impact from the rocks in the track.

The mod in the servo horn is cut out the outer hole, so it fits in the reversed servo mount without hit the diff cover and the tie rod.
The second picture kinda shows it.

 

[Adamgllc]

Yes, but more for keep the servo away from direct impact from the rocks in the track.

The mod in the servo horn is cut out the outer hole, so it fits in the reversed servo mount without hit the diff cover and the tie rod.
The second picture kinda shows it.

Cool, thanks for clarifying.

 

[DenisLM]

This picture shows the servo horn mod better:

 

[Adamgllc]

Sweet, thanks! Makes perfect sense now.