Slipping Spool

Old 01-09-2007, 01:51 PM
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Default Slipping Spool

In Modified, spool is the way to go, no doubt!!
So I hear from al lot of top level drivers,
they also complain about the wear out of the drive shafts.

The forces ( dont underestimate the force ) building up
in for instance braking are enormous.

Some also tried a diff without balls,
but i think the pressure from the M2 bolt is not enough.

Has anyone tried to make an slightly slipping spool,
that let your axles live but gives the extra corner power
and braking possibility?
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Old 01-09-2007, 01:53 PM
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Originally Posted by OscarF1
So I hear from al lot of top level drivers,
they also complain about the wear out of the drive shafts.

The forces ( dont underestimate the force ) building up
in for instance braking are enormous.

Some also tried a diff without balls,
but i think the pressure from the M2 bolt is not enough.

Has anyone tried to make an slightly slipping spool,
that let your axles live but gives the extra corner power
and braking possibility?
thats when the diff with out diffballs comes in
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Old 01-09-2007, 02:08 PM
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Refrase:

Did anyone try to build somthing a bit stronger ( stiffer ) than a diff without balls?
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Old 01-09-2007, 02:17 PM
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Originally Posted by OscarF1
Refrase:

Did anyone try to build somthing a bit stronger ( stiffer ) than a diff without balls?
AdrianM from Schumacher U.S.A can explain it alot better than I could !
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Old 01-09-2007, 02:23 PM
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Originally Posted by Marcos.J
AdrianM from Schumacher U.S.A can explain it alot better than I could !
Does he read this forum ?
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Old 01-09-2007, 02:25 PM
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Originally Posted by OscarF1
Does he read this forum ?
yes very often!!
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Old 01-09-2007, 02:26 PM
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Originally Posted by OscarF1
Does he read this forum ?
this is his sreen name AdrianM shot him a pm
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Old 01-09-2007, 03:01 PM
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Just tighten up a normal diff.

I think the guys are refering to the diff where you take the diff balls out, then use two cardboard (cereal packet type) shims betwen the diff rings and the plastic pulley.

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Old 01-09-2007, 03:04 PM
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If you crash enough that you are too frequently damaging your spool you can build a slipper spool out of a front diff. I think Losi was the first to do this with their XXXS.

A slipper spool functions the same as a spool under normal racing conditions but if you crash the out drives can slip to prevent damage

To do this you will need a front ball diff. If your car uses diff out put blades on the drive shafts you can use alloy diff out puts. If your drive shafts use steel pins you need to use steel diff outputs.

This is how to make a slipper spool:

1. Disassemble your ball diff and remove the diff balls. Clean the diff pulley with motor spray untill all the diff lube is gone. Clean the diff rings the same way.

2. Glue card stock (header cars, business card, note card,...) to one side of each diff ring with CA. Cut out the rings so you end up with diff rings faced on ove side with card stock.

3. Re-assemble the diff without the diff balls and with the paper side of the diff rings toward the diff pully.

4. Tighter and adjust your new slipper spool like a ball diff. On a Schumacher we tighten the diff screw until it stops then back it off ~1/4 turn.

Thats it!

The card stock takes up the space the diff balls took up so the width of the diff remains correct. The paper also makes it harder to slip.

As long as you don't hit anything its a spool and it will not move. However, it will move if you crash and allow the energy of the crash to disperse before you blades, drive shafts or suspension gets damaged.

Note that this works better on cars with stout M3 diff screws like Schumachers and Xrays. If you have a small diff screw it may snap. In that case run a normal spool and learn not to crash
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Old 01-09-2007, 04:19 PM
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Note that this works better on cars with stout M3 diff screws like Schumachers and Xrays. If you have a small diff screw it may snap. In that case run a normal spool and learn not to crash
Verry clear

Thanks AdrianM !

I will try it with some thin epoxy plate rings in the diff pully.

Also find a way to make a strong M3 diff screw fit.

I assume its okay to leave the spring out but do i need the thrust bearing ?
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Old 01-09-2007, 05:17 PM
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In the original XXXS the spool pads weren't very good. I used them in my JRX-S and they would come loose after about 3 race meetings. Losi have new ones out now but I don't know how there fairing.
http://www.teamlosi.com/newprod/index.htm

When I was running the JRX-S, I used these;
http://www2.towerhobbies.com/cgi-bin...?&I=LXC590&P=7

Just drilled out a hole for the centre bearing, face the grit side to the diff ring (paper side to the pulley) and tighten up. The OD was a perfect fit for the Losi pulley, I ran them for over 6 months without it slipping too much and only had normal wear of the outdrives.
Good luck....


Regards,
Peter
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Old 01-09-2007, 06:43 PM
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You guys are missing the point. Epoxy and sand paper will make it solid and it will break just like a machined one piece spool.

Besides, if you want a diff all you need to do is replace the diff rings and add diff balls.

The slipper diffs I have run never wear out. Eventually a big enough hit can break an outdrive but the paper and diff pulley never wear out. Like I said the only time it slips is during crashes.
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Old 01-09-2007, 07:43 PM
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Originally Posted by AdrianM
You guys are missing the point. Epoxy and sand paper will make it solid and it will break just like a machined one piece spool.

Besides, if you want a diff all you need to do is replace the diff rings and add diff balls.

The slipper diffs I have run never wear out. Eventually a big enough hit can break an outdrive but the paper and diff pulley never wear out. Like I said the only time it slips is during crashes.
Adrian... is it OK if I share my experiences thou....

I could never get the original Losi spool pads to stay tight... I also never broke an outdrive with the sandpaper pads either... But ultimately it comes down to what Oscar wants... so try the "business card" if it works Great. Problem solved. If it doesn't... then there are a few options

Last edited by 2-Bad; 01-09-2007 at 07:55 PM.
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Old 01-10-2007, 08:14 AM
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Originally Posted by 2-Bad
Adrian... is it OK if I share my experiences thou....
Sorry, ...I didn't mean it that way. My post is more about offering novice drivers an alternative to a fixed spool so their cars dont get torn up.

You are absolutly right about the XXXS. I know a few Losi Pros drivers and they said the same thing when they ran it.
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Old 01-10-2007, 08:30 AM
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Not that this is going to help the OP, but I run a JRXS and use the Losi Spool Diff gears they put out now and really like it. It will offer some slip in a hard crash in the sense you are not tearing up outdrives but is solid other wise. I tried the sand disc as well and still have a new set in my box never to be used but the new Spool Gears are nice. Just my couple of cents worth.
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