Savage XL-E

[tklemin]

cool I'll give it a shot.

[Janezki]

I've been a bit busy because of my work, so I haven't been able to enjoy my hobbies that much recently.
Anyway, since the last upgrade/date to Revo slipper this has happened:

Diffs converted to CENs:





Bought one of the last (?) Tekno Neus:



Bought two new lipos:



Changed tires to Badlands:





And had some serious fun and enjoyment from this setup.

Im using 18t pinion with the 49t MGT spur, so with 6S the truck is reasonably fast for offroader.
The motor is just pure insanity and I love it - should've got it right from the start...
It doesn't get hotter than 60°C (140°F) no matter how I punish it and lipos stay cool also.

Here's the data from Brian's calc:

Differential Ratio: 2.888888888888889
Transmission Ratio: 2.25
Other Ratio: 1
Spur Tooth Count: 49
Pinion Tooth Count: 18
Total Voltage: 22.2
Motor KV: 2200
Tire Diameter (inches): 5.84
Tire Ballooning (inches): 0.5
Motor Current Draw: 110
Motor coil Ω: 0.006
Spur/Pinion Ratio: 2.72 : 1
Total Ratio: 17.69444 : 1
Tire Circumference (inches):21.49 inches (545.81 mm)
Total Motor Speed: 47388 RPM
Vehicle Speed: 54.5 mph (87.54 km/h)
Effective KV Value: 2134.59
KT constant: 0.61 oz-in/A
Motor Torque: 0.35 ft-lbs
Final Torque: 6.23 ft-lbs
Final Power: 2442 watts (3.3 HP)

Unfortunately there's no video yet, I've been so excited to just drive.

[spiftacu1ar]

DOnm't mean to pop your bubble, but I don't think those batts are adequate for your setup. As rule of thumb, your continuous and burst amp ratings should be 25% more than the actual continuous amperage and burst amperage (in practice). You can get away with an 80 amp continuous rating, but to be on the safe side, I would say go for 100 (those are rated at 79.5, so 80). That is not where the problem lies. Your batts are rated at a burst rate of 106amps. According to your values above, 2442watts / 22.2v = 110 amps. Your burst amperage is less than the calculated amperage above. Your batteries may not be overheating now, but I thnk it may be a problem in the future. If not the batts, it will damage your ESC.
Sorry if I ruined your fun, I'm just trying to prevent you from losing expensive equipment.
--Spif

[Janezki]

You are correct in your calculations with one battery - I'm running those in parallel.

[spiftacu1ar]

oh sorry, i thought those were two 3s cells :P. My bad. Can I have a link please. I have been looking for 2 6s packs that would fit between the TVP's for a while. All of them were too long or too wide, but those seems perfect (i have the same setup as you, except with FLM tvp's instead of those). I also preordered my kersahw gearbox so that it would mount backwards be default instead of drilling new holes in the chassis.

[Janezki]

:) No problem.
http://hobbycity.com/hobbycity/store...idProduct=9268
There you go - seem to be out of stock at the moment.
They're pretty much perfect fit between the tvp's.

[Janezki]

->Finally some video<-

Love this setup (did I mention it already?), no bigger mods will be made - this one's ready (sure!)...

[Bondonutz]

Great video, that bash spot is Tits ! I was woundering how you mamaged to shoot video and drive and at 6:11 I seen your shadow, LOL. You have your hands full.

[Savage03]

Awesome! Kill to have something like that by me even within driving distance. And the riding the half bowl was great!
Now to this very odd radio handling lol, credit for doing both driving and taping at once my man!

[Nard Cox]

LOVE the car man, it's brutally fast and has tons of power. Looks like those BadLands grip like hell :)

For filming : buy a TriPod to shoot the vids, you can concentrate on the driving more altough you're not bad at all with the driving and filming. When I want to film and drive I take my GorillaPod (sort of a tripod with three flexible legs) and put that on my transmitter (DX3S) works like a charm. How do you do this, one hand vid and the other transmitter?

Possible upgrade : center skid plate to keep the dirt out (or would this just lock it up inside?)

[Bondonutz]

How about a hard hat with a camera mount attached ?

[Nard Cox]

That would be even better! I do have a hat lying around here somewhere with a 'sun visor' (no idea how you say it). Worth giving it a shot altough most of the time I race with some buddies and we film using tri pods (see here).

[Bondonutz]

Most cameras have the threaded hole on the bottom for the tripod mount you could just thread a bolt through the hard hat and tighten a nut on and screw the camera on ?
You wouldn't need a "mount" then. I'm gonna try it ?

Edit; Just bought one on Fleabay for 11.00 new.
http://cgi.ebay.com/NEW-Industrial-P...d=p3286.c0.m14

[Savage03]

lol gonna need a shot of that hardhat setup may work tho.
I recnetly bought one of these gopro on board cams and as a option they sell a wrist mount deal you can put the cam on your wrist, maybe one of those could be fitted for a larger handheld cam? use it on your hand that holds the tx since I tend to follow the cars movements with the tx anyways haha.

[Janezki]

Yes, it is pretty hard to drive and film at the same time. I definetely can't concentrate 100% to controlling the car, so no "super tricks" this time.
I have a decent tripod, but then there's the problem of stationary camera and I like to follow the car while it's moving.

Hmm.. helmet cam... there's a funny idea...