Harley's #AxialYeti

[Harley]

Originally Posted by savagebeast

I downloaded the android app but have yet to find a male 2 male micro usb, what do you plan to use, or have you already found one? If so what and from where? Also my 2 cents on the power program, I run an 1850kv pro4 hd in my dmg koh #7, last year i ran it w a mmp. Stock axle gears, rrp gen 3 slash slipper 32p, I was running 18t pin. This spring I got a rx8 gen2 and decided to go down to a 14t pin as my hobbyking 2200 3s packs seemed to drain faster, I know that would most likely be due to the higher amp output of the gen2, so what gearing do you plan on running and what size packs? Just curious and can't wait to see what all you do to this rig. Always very impressed with what you put out!

When I find the proper cables/adapters I'll post up where I found them.

Gearing is something I have been looking at very closely for this truck and coming up with the exact plan of attack. I want to ideally come close to matching where I have been running my Wraith at.

My Wraith:
With stock ratio axle gears, 56t RR Gen 3 slipper and a 12t pinion
Overall ratio: 35.9:1

Stock Yeti
Overall Ratio: 22.67:1

My Yeti Plan
Underdrive Gears front and rear, 64t spur...
With 12t pinion, Overall Gearing: 34.2:1
With 11t pinion, Overall Gearing: 37.3:1


For batteries, I have the high output 2200 Turnigy packs, labeled 60-120C as well as the Turnigy 2650 packs. I have had good luck with both of these so far on the high draw 4 pole Tekin motors. We will see how it does with this HD motor.

I do NOT suggest the Nano-tech packs from Turnigy, I have found them to be poor quality on more than one batch. Out of the 8 Nano-tech packs I have, none of them have survived more than 6 months of use.

[Harley]

Originally Posted by bilinvic

Looking forward to hearing your impression of this powerplant set-up in the Yeti. I was cruising the Tekin website last night and looking at the same motor...the only thing that had me doubting was that this motor tops out with 3s power. I was kinda hoping to be able to use a 4s LIPO on this rig. I know...probably overkill!!!!!!!!!!

I should reinforce that I plan to use this truck in lots of rocky crawling type situations and less go-fast stuff then many other people may chose to use. However I do still expect this to have plenty of ability to be ultra competitive in a U4 style class, with little more than the swap of a larger pinion at most.

If you are more go-fast then me, maybe 4s is the route for you but look at it this way:

4300kv on 2s (7.4v) = 31,820 RPM
3500kv on 2s (7.4v) = 25,900 RPM
3000kv on 3s (11.1v) = 33,300 RPM
1850kv @ 4s (14.8v) = 27380 RPM

[savagebeast]

Great info. Thanks

[Harley]

Originally Posted by savagebeast

When the 2spd is available a 3s with a high c rating should ripp pretty hard. 4s would be insane. Make for some awesome video footage though

The 2 speed option is going to offer a lower first gear, I believe the stock gear ratio will REMAIN for the second gear.

This is an UNCONFIRMED bit of information.

[bilinvic]

Thank you for your very intelligent and informative posts Harley. I bow down to you as the RC GOD!!!!

[fatroofus]

I couldn't agree more with going with a complete tekin system! I feel that once the curves are dialed in on a PC, or app other ESCs feel inferior.

Great choice!

[Harley]

Originally Posted by fatroofus

I couldn't agree more with going with a complete tekin system! I feel that once the curves are dialed in on a PC, or app other ESCs feel inferior.

Great choice!

This will be the first time I've used an RX8 in a rig of my own. I'm looking forward to running it.

[WHITE-TRASH]

I like your plans for the rig. I'll have to copy the pertinent parts for my ghetto yeti build.



You'll love the rx8 I'm sure. It's a solid esc that can really put down some amperage. I hadn't heard of the new gen 2 being able to be programmed by android, looks like I have another reason to get one.

[the DMG]

Originally Posted by Harley

This will be the first time I've used an RX8 in a rig of my own. I'm looking forward to running it.

i really like my RX8 in the Bad Monkey IFS rig
don't think ill go back to castle any more !

[gbean]

Originally Posted by savagebeast

I downloaded the android app but have yet to find a male 2 male micro usb, what do you plan to use, or have you already found one? If so what and from where? Also my 2 cents on the power program, I run an 1850kv pro4 hd in my dmg koh #7, last year i ran it w a mmp. Stock axle gears, rrp gen 3 slash slipper 32p, I was running 18t pin. This spring I got a rx8 gen2 and decided to go down to a 14t pin as my hobbyking 2200 3s packs seemed to drain faster, I know that would most likely be due to the higher amp output of the gen2, so what gearing do you plan on running and what size packs? Just curious and can't wait to see what all you do to this rig. Always very impressed with what you put out!

You'll need an OTG (On The Go) cable to connect the Tekin Hotwire to your Android phone. These cables are female standard USB to male micro USB.

If you want to save an extra connection point you could certainly use this write up from Makezine as a starting point for producing your own male micro to male micro USB cable.



Can't wait to start beating a Yeti.

[Ty@Tekin]

Originally Posted by bilinvic

Looking forward to hearing your impression of this powerplant set-up in the Yeti. I was cruising the Tekin website last night and looking at the same motor...the only thing that had me doubting was that this motor tops out with 3s power. I was kinda hoping to be able to use a 4s LIPO on this rig. I know...probably overkill!!!!!!!!!!

1850 is the perfect motor for 4S. You need to keep the motor kV matched to the battery you're going to use. 3000kV on 4S is really pushing the RPM limits of the motor and it will be way too fast.

[Harley]

Originally Posted by gbean

You'll need an OTG (On The Go) cable to connect the Tekin Hotwire to your Android phone. These cables are female standard USB to male micro USB.

If you want to save an extra connection point you could certainly use this write up from Makezine as a starting point for producing your own male micro to male micro USB cable.

Can't wait to start beating a Yeti.

Awesome, thanks Griff. I hadn't done the research on that yet. Big help

[gbean]

Originally Posted by Harley

Awesome, thanks Griff. I hadn't done the research on that yet. Big help

No problem.

I have all the stuff to setup via Android, just haven't had the time to install the Tekin system I snagged at Axialfest yet.

[eric113]

Originally Posted by Harley

Awesome, thanks Griff. I hadn't done the research on that yet. Big help

Here the cable you need. No adapters.

8inch USB 2.0 Micro-b to USB Mini-b Male/male Adapter Cable:Amazon:Computers & Accessories

[gbean]

Originally Posted by eric113

Here the cable you need. No adapters.

8inch USB 2.0 Micro-b to USB Mini-b Male/male Adapter Cable:Amazon:Computers & Accessories

*Be sure the cable is labeled "OTG" otherwise USB host mode may not be initiated on Android devices.*

Here is a longer cable (~3') that is reviewed well for roughly the same price as the cable you linked to. (And OTG specific )
I can imagine being limited to holding your phone 8" from the hotwire might be frustrating.

[Del Monte]

Amazon.com: StarTech.com Micro USB OTG to USB Adapter - Micro USB Male OTG to USB Female Adapter - USB On The Go Adapter: Computers & Accessories

I'm using this adapter with a Hotwire 2.0 to tune my Rx8 on my android tablet.

[Harley]

Tonight I was wanting to get down into the shop but didn't really have a plan on what I wanted to do. After sitting there staring at the car for a few minutes, I decided that I was going to play around with a new front bumper.





When running the truck out at Goat Hill and in Colorado, I had got caught up on the front bumper a couple times. So I decided I would make a more minimal bumper.

I still wanted to maintain the spring that the stock bumper uses. If you are going to run any real power in this truck I think that spring is going to help keep the front bulkhead together. A solid front bumper is probably only a good idea if you go to an aluminum bulkhead.

I have been running a piece of closed cell foam inserted into the stock spring to stiffen up the front bumper considerably. I will continue to run this.

[Harley]

I threw together a simple little skeleton of the bumper. Very simple.



After I had the basic frame done, I worked on a paper template for the steel skin that I planned to attach to the front of the plate.

[savagebeast]

Looks good, tough too

[Harley]

I then transfered my template to some 18 gauge steel plate and welded it to the bumper frame.






Lastly, I welded the plate onto the bumper. Pretty simple little setup.