1/6 Losi Hummer (CC1717) Build

[brian015]

Thanks for the kind words - and I'll pass them along to Daniel.

Originally Posted by Overdriven

I was reading back through the thread and I noticed the lexan you put on top of the shock piston for the variable damping. I like the idea and will experiment with it on my build. It probably helped alot when using LST springs on a fairly heavy rig as it adds compression damping without effecting rebound much. But I wonder if now the springs are strong enough to not require that added compression damping and placing them under the piston to add rebound damping.

That's exactly why I modified the piston - because even the RC-raven springs were not strong enough for these larger trucks. So, I may just get rid of the lexan pieces if I'm not happy with the suspension (I hadn't considered your idea of putting them underneath to add rebound damping - but I'll keep it in mind) . I put thicker oil in the shocks yesterday and like the way it feels just sitting here pushing on it - but I'll have to get it out again and test it.

[brainanator]

Great camera work from the little one!
And I guess the truck isn't half bad either...

[brian015]

I guess it's been a while since I've done anything with this truck (busy couple of months - I'm starting a new job, will soon be moving, etc.).

Anyway, I put thicker shock oil (30wt) in the shocks and it handles much better. I might even go thicker.

The electric brakes on the HW esc are very strong - I did a front flip when I slammed the brakes on today (I think I have them programmed to 50%, but I'll have to check). But this truck is running pretty well.

[Bmr4life]

Originally Posted by brian015

I guess it's been a while since I've done anything with this truck (busy couple of months - I'm starting a new job, will soon be moving, etc.).

Anyway, I put thicker shock oil (30wt) in the shocks and it handles much better. I might even go thicker.

The electric brakes on the HW esc are very strong - I did a front flip when I slammed the brakes on today (I think I have them programmed to 50%, but I'll have to check). But this truck is running pretty well.

I think its more so the 1717 having an immense amount of braking power.

[brian015]

Originally Posted by Bmr4life

I think its more so the 1717 having an immense amount of braking power.

That might be the reason - All I know is that these brakes are much stronger than the mechanical brakes I was using on my other large-scale build.

Originally Posted by Bondonutz

Haven't checked back on this thread in a loong time, gotta say it finished very nicely !
Great work Brian.

Thanks Bondo - I must admit I haven't driven this too much - so I haven't had anything to add in a while.

i gotta agree with bondo there brian....nice work on the fabbed parts.
a great looking truck
chris

[Bondonutz]

Haven't checked back on this thread in a loong time, gotta say it finished very nicely !
Great work Brian.

[brian015]

Thanks Chris - just wish I had more time to drive/tune this thing.

I do think the 1717 is a great motor for something this size - I still can't believe they released the HPI 5SC Flux without it!

[Bondonutz]

I hope Castle doesn't get beat up on 2200kv and/or ESC issues from HPI under motoring that thing ?

BTW Brian, Have you seen all the fab work I've done on my build ? I think you'd appreciate it since you like to make from scratch like myself.

[brian015]

Originally Posted by Bondonutz

I hope Castle doesn't get beat up on 2200kv and/or ESC issues from HPI under motoring that thing ?

That was my thought when they announced it was going to use the 2200kv - with all the bad press Castle has received over the XL, they don't need more because of idiots who think they can gear that thing any way they like and not bother to check temps.

Originally Posted by Bondonutz

BTW Brian, Have you seen all the fab work I've done on my build ? I think you'd appreciate it since you like to make from scratch like myself.

Yes, I've looked through it quickly a couple of times - and you've been working overtime on that build - really nice. When I get some time I'll look through it carefully and maybe get some ideas for my next build - I have some crawler/scaler parts that I bought recently, and hope to do something with them sooner or later.

[brian015]

I had this out again today and it ran well - I'll post a couple videos in a bit. My only concern is that this truck tends to roll over much more easily than my other large-scale build. This has a slightly narrower width, it's center of gravity is a bit higher due to the body, and it has better tires (more grip in the grass) - all of these I'm sure contribute to it rolling over more, so I'm not sure what I'm going to do. The major advantage of this truck over my buggy-style build is that this has more room for batteries.

I could easily make the truck wider by using the full extended wheel hexes (instead of the cut-down hexes I have on this). I'm sure that would help, but I don't know if I'd like how it looked.

Or I could run it w/o the body (but I know some people didn't like how it looked under the body).

If you have any other ideas, let me know.

[brian015]

Videos:





I had some better jumps off the lip of the infield than we got on this video - but here it is anyway:




Edit:
Temps (outside 85F) after approximately 15min run:
Motor (Castle XO-1 1717) - 160F
ESC (EZrun 150A pro) - 145F
Batteries (2x Gens Ace 6s 25c 4000mAh in parallel) - 99F
Center diff - 135F

The batteries were not completely drained (probably 3000mAh used in each). This esc/motor combo on 6s has plenty of power and seems like the perfect size for this truck.