Savage XL-E

[scarletboa]

why didn't you keep the savage slipper?

[Janezki]

It doesn't keep it's adjusted position, atleast I haven't succeeded in that.
It either slips too much or not at all, so this is supposed to be an upgrade.

[tklemin]

I've also noticed that you need to have the slipper pretty tight for the big motors. When you start to coil bind the little spring it will unevenly load the spur gear and cause it to spin in warped looking pattern. Then you back off the slipper to get it straight and the slipper slips. If anyone knows of a little larger or longer spring that might work it could be a useful mod. I think HPI is using the term slipper clutch very broadly here. A sticky backed piece of sandpaper is not a slipper clutch. I might see if I can fit 2 springs on the slipper.

[spiftacu1ar]

Kershaw designs has an upgrade kit that consits of two bellevile springs and a thrust washer. Here it is: http://204.186.93.64/SlipperSpring.htm

I am using that kit, and it helps a lot.

[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.