Mechanical Brakes

[jhautz]

Originally Posted by entjoles

looks great guys


jhautz....which servo are you using?

Hitec HS5245MG
Torque:61.10 / 76.37 oz.in (4.8v/6v)
Speed: .015 / 0.12 sec @ 60 deg.
Size:1.27" x 0.66" x 1.21"

got mine done on my xt8 , but my wife took the kids out of town and has the camera with her so it will be a few days for pics, i used a full sized servo with the frt. and rear brakes, servo fit inbetween the steering servo and pinion, mixed 3rd channel

had to gear 18/48 to use the rear brakes, off to check the speed calc.

heres some pics, its very solid and works great, took it for a drive today, just dont forget the locktight on the rear screws


my only concearn with this is after 10 minutes of speed runs my temps were 160* motor, and 135* on the esc. w/o fan,(40* outside), but i cant change my gearing , i dont think that a 17 tooth pinion (1 less then now) would work, there is like 1-2mm between the motor can and the rear brake pads

any thoughts or comments would be great

punch cont. was @ 80%
motor timing normal
motor start power low

**minor cogging on start-up ..... is this caused by the start power or the punch control or timing??
this is not a hyjack, i just thought it would be a great place to discuss these set-ups

[jhautz]

Nice build entjoles

I found the same problem with the gearing when using brake disks. You can only get the motor so close before it rubs the disk. With a standard 36mm can like a Feigao XL or Lehner I can get a 16/46 to work (but its VERY close). The only solution I found was to run a low KV motor and then use the taller gearing to get the speed. If your using a 9xl you may need to go to a 10 or 11 xl to get the right speeds with the gearing that will fit for you.

Another thought that I had, but hadn't tried it yet was to get a couple of Mikes motor front plates he makes for the Lehners and Neus and stack them up so it pushes the motor back from the actual motor mount and then you could cut a flat off on the side of the adapter plates to let the disk go in and the disk would actually kinda be between the motor and the motor mouunt plate. That woul let yu get the mtoor in closer with the brake disk.