benifits of Planetary differentials?

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TerraKill

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ive just been checking out some MCD cars, like the cheetah MT for example, and i see it has Planetary differentials, i wondered what the benifits to these are if anyone knows?


the only expericence ive had with Planetary diffs has been on old skool ford tractors, so ive always thort they have been for high torque, heavey slow moving machines?


some1 set me straight please :rolleyes:
 
I'm pretty sure you call these planetary diffs...and they are in your Rampage

Diff.webp

Diff.webp

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krashkrieg said:
I'm pretty sure you call these planetary diffs...and they are in your Rampage
Click to expand...
im pritty sure that kind of diff is called a Lsd(limited slip diff)?

this is a planatery diff, its a diffrent type of diff, this is the only picture i could find as the mcd website is down30082010312.webp
 
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Planetary diffs are very efficient and durable compared to a traditional diff. Depending on the number of gears, or "planets" inside the diff, they can handle a higher load than traditional diffs because the load is being evenly carried and transferred by each gear. The "planets" also increase efficiency, because they transfer more energy through the diff. Basically, they get the energy from point A to point B with limited loss. Also, they don't require diff fluid. Just pack them with grease and you're good to go.
 
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Mcd`s are known for weak differentials. After july 2010 they beefed up thier gears. Still they have a bad rap on thier diff`s,and this stops guy`s from buying mcd. Mcd has lsd diffs at a price of $400 for a front and rear. Mcd stuff is expensive.
 
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after some readin on mcd forums, seems everyone replaces this planetery diff for the lcd ones, they say, it dosnt matter what oil/grease you use, the diff always runs loose, one guy even said about using road tar in them lol?

so im guessing the verdict is, there no good for r/c cars?
 
I guess it depends. Traxxas has been using them in their vehicles, including my Stampede and it's been great. In theory, they're better. Tolerances and the quality of the materials used are variables that could make or break any design.
 
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