Schumacher to Re Release the Cat XL!

[Rs fruitbat]

Cool vid , I think every Rc enthusiast should have a track in they're back garden 9/10 women would disagree

[Tarmac]

Originally Posted by Retro RC

That's good news Justin if I ever get mine out of ups' hands I'll be happy, bloody rip off merchants that they are

Glad I wasn't the only one who got stung by MPI! Built yours yet? Any parts missing? Mine is 75% done, up to the steering, and was missing a small metal pin from the spur gear shaft.

[tahustvedt]

Originally Posted by Rs fruitbat

Cool vid , I think every Rc enthusiast should have a track in they're back garden 9/10 women would disagree

I finally found a good use of my yard.

What's women? Are they brushless?

[stuey]

I ran mine at the Revival with a 13.5t motor. I found that you had to run the layshaft diff pretty tight to stop it slipping, leading to a stiff rear diff action. It is a pretty sensitive adjustment too. I did not have any other issues with slipping diffs or belts, I did go one hole tighter on the rear belts as I felt the kit setting was too loose. I am looking forward to the transmission upgrade.......

[Danf1275]

Originally Posted by tahustvedt

The ESC barely fit between the steering servo and the battery post. I think they should have moved the battery posts backwards about 2 mm. I have a smaller ESC on order. This is just temporary. I cannibalized the ESC from my BSR BZ-222.

Not a huge fan of kit Lipo holders, they waste too much space for my liking and make transmission maintenance tricky - I'm using some of my own design, freeing up around 10mm of room for electrics.

https://www.shapeways.com/product/7X...ionId=60691971

[tahustvedt]

Originally Posted by stuey

I ran mine at the Revival with a 13.5t motor. I found that you had to run the layshaft diff pretty tight to stop it slipping, leading to a stiff rear diff action. It is a pretty sensitive adjustment too. I did not have any other issues with slipping diffs or belts, I did go one hole tighter on the rear belts as I felt the kit setting was too loose. I am looking forward to the transmission upgrade.......

Same here. When the spring washer collapses the adjustment becomes extremely sensitive as there tension rises. A stronger washer would help with the sensitive adjustment, but the diff stiffness wouldn't be solved. Seems to drive fine with the stiff rear diff in my case though. I have turned down the punch on my ESC. Makes me wonder if Masami and other just used the diff as a slipper clutch back in the day. Nothing lasts forever anyway. I'm pretty sure my Procat diff slipped a lot back then. This was before slipper clutches, and the peak torque from impacts is very high.

[tahustvedt]

Schumacher is sending me replacements for the damaged bolt and missing diff hub.

[tahustvedt]

Hot tip: Buyg extra wings, or use a more durable wing for driving. My wing is completely destroyed after two packs.

[daz75]

Or drive better

[tahustvedt]

Or that. I've traction rolled about five times, and the wing is a mess. I'd buy a 1mm lexan version.

[isobarik]

There are repo nylon/plastic wings they are very durable

Mvh isobarik

[Peakey]

Speed secreats option parts are becoming available so looks like the pro diff transmission kit won't be long

http://www.racing-cars.com/sp/catego...ion_Parts.html

[tahustvedt]

I received my replacement kit parts from Schumacher today. That was fast.

[oldenoughtoknowbetter]

Originally Posted by THancock

I'm doing something wrong...

I'm running the car with a 19x1 brushed motor (Atlas) on grass with the original tyres, yet I am suffering with two persistent problems:

1. The front belt slips (load clicking noise) unless I am very gentle with the application of throttle. I cannot move the front gearbox any further forward physically (and the belt has little slack), nor tension the rear belts any more without binding the transmission.

2. The spur gear diff melts around the balls.

I've built tons of ball diffs in the past and used the same run in procedure with the Cat. The diff action was lovely and smooth and there was no slip (rotating by hand). But as soon as it is under load from the motor, after a couple of minutes, I can feel the slip in the transmission and sure enough, the spur diff is hot as hell and if I'm too late in stopping, a sticky plastic mess.

Any advice on what others are doing would be appreciated.

- Tim.

My spur gear has melted around the balls too. I was running a 10t motor but think the slipper was too tight

[tahustvedt]

I modeled a printable wing for it:
https://www.thingiverse.com/thing:2549779
https://cults3d.com/en/various/wing-...macher-cat-xls

[Danf1275]

Originally Posted by oldenoughtoknowbetter

My spur gear has melted around the balls too. I was running a 10t motor but think the slipper was too tight

Slipper?

[oldenoughtoknowbetter]

Originally Posted by Danf1275

Slipper?

or whatever it is

[Peakey]

That's the diff

[tahustvedt]

The spur diff melts if it's too loose and slipping a lot. The temperature where I live is about 14°C when I drive, so it's not exactly hot, but there's no sign of damage on my spur gear. It slips occasionally. I can hear it if I punch it on launch. I have tightened it slightly beyond a flattened spring washer. I should really add some washers to increase the spring tension without flattening.

I run a 17,5T brushless with a 28 teeth pinion which is the biggest that would fit and all is running well.

Every time I run mine I have to remove the right rear wheel to empty out all the debris that worked its way through the gap between the wheel and hub. It's pretty odd how much crap gets in there, especially since my track is counter clockwise.

[Stu Dixon]

oh my that car is a bitch to build ! worth it tho