Bit of a Kyosho Rock Force build

[dave56bug]

Ok here are some pics:
http://i239.photobucket.com/albums/ff119/tacomadave_bucket/rock%20force%20build/IMG_0603-1.jpg
http://i239.photobucket.com/albums/ff119/tacomadave_bucket/rock%20force%20build/IMG_0604.jpg
http://i239.photobucket.com/albums/ff119/tacomadave_bucket/rock%20force%20build/IMG_0605.jpg
http://i239.photobucket.com/albums/ff119/tacomadave_bucket/rock%20force%20build/IMG_0608.jpg
http://i239.photobucket.com/albums/ff119/tacomadave_bucket/rock%20force%20build/IMG_0606.jpg

The metal parts in the axle are very robust, quite heavy, 1/8 scale buggy parts. I am very impressed so far.
http://i239.photobucket.com/albums/ff119/tacomadave_bucket/rock%20force%20build/IMG_0611.jpg
http://i239.photobucket.com/albums/ff119/tacomadave_bucket/rock%20force%20build/IMG_0613.jpg

[ajcloud]

where is everyone getting these? you have some special hook up somewhere?

[dave56bug]

Driveshafts are he splined, with a length of "allen key" in the centre.
http://i239.photobucket.com/albums/ff119/tacomadave_bucket/rock%20force%20build/IMG_0614.jpg

Transmission have no gears, all reduction is in the worm gears in the axles

http://i239.photobucket.com/albums/ff119/tacomadave_bucket/rock%20force%20build/IMG_0615.jpg

http://i239.photobucket.com/albums/ff119/tacomadave_bucket/rock%20force%20build/IMG_0617.jpg

http://i239.photobucket.com/albums/ff119/tacomadave_bucket/rock%20force%20build/IMG_0619.jpg

Sorry for the crappy photos, will get some better ones tomorrow, it's kind of late here.

[2JSC]

Those axles REALLY got me wanting one. Is there a way to reverse the input on the axle to flipp the diff to the passenger side?

[mulepic]

that looks impressive. i wonder if it will not have torque twist b/c the driveshaft pushes/pulls on the ring gear.

[Hurley0706]

that looks impressive. i wonder if it will not have torque twist b/c the driveshaft pushes/pulls on the ring gear.

Since almost all of the reduction is in the axle they will have very little tourque twist.

[constantmotion]

Kinda crazy to have dogbone axles shafts. I like the simple direct drive tranny.

[XPLORx4]

The axle design practically eliminates torque twist, replacing it instead with axle wrap. Since the torsional force from the driveshaft is converted to compression/tension (forward/reverse) force by the worm gear, there should be NO torque twist whatsoever.

[cvwindows]

Now you need a two speed tranny with this type of setup.

[John]

Kinda crazy to have dogbone axles shafts. I like the simple direct drive tranny.

The dogbones are the same size as Kyosho used for their Twin Force Monster truck and the same size others have used for Super Class Twin Force crawler rigs. They held up pretty good in my Super Twin force rig and I would expect in a 2.2 application that they will hold up just fine. Time will tell. These are no TLT dogbones. They are thick and beefy.

[JohnRobHolmes]

Are they short side shafts from the TF axles?

[Kamikaze]

The axle design practically eliminates torque twist, replacing it instead with axle wrap. Since the torsional force from the driveshaft is converted to compression/tension (forward/reverse) force by the worm gear, there should be NO torque twist whatsoever.


No, thats not right. Torque twist is caused by the gears resisting being turned by the driveshaft, not by the direction of gear load. They will have less torque twist because all of the reduction is inside the axle, thus making the drive shaft much easier to turn.

[jason]

No, thats not right. Torque twist is caused by the gears resisting being turned by the driveshaft, not by the direction of gear load. They will have less torque twist because all of the reduction is inside the axle, thus making the drive shaft much easier to turn.

This is the first shafty rig I have owned that has 0 torque twist.

On carpet I can go full throttle forward to full throttle reverse and the chassis doesn't move a bit.

[sddill]

I really like the axles "thumbsup" But the chassis looks way to big and heavy...Wonder if they will offer just the axles and tranny ( I guess thats what you still call it) :?:

[John]

I really like the axles "thumbsup" But the chassis looks way to big and heavy...Wonder if they will offer just the axles and tranny ( I guess thats what you still call it) :?:

Axle kits will be available early 2009. The Spur gear and motor assembly plate should be in stock as a seperate item now.

The chassis has that bulky look, but the weight isn't too bad. Just two alluminum side plates and plastic chassis spacers/standoffs. The skid is alluminum.

[sddill]

Thanks for the reply John "thumbsup" I know what I will build for my 09 rig now ;-) I wonder if it is geared low enough that you could put like a 9 turn or so motor in it and still crawl but have the wheel speed in reserve :shock:

[dave56bug]

It recommends a 20-27t motor, I'm going to try my Novak Goat, and I also have a nice 19t that I might try out.

[dave56bug]

Quick paint job,

http://i239.photobucket.com/albums/ff119/tacomadave_bucket/rock%20force%20build/IMG_0621.jpg

http://i239.photobucket.com/albums/ff119/tacomadave_bucket/rock%20force%20build/IMG_0624.jpg

[dezmoon]

how do the stock tires feel??????????

[JOOTZ]

the rig looks very robust, what is your take on the hardware supplied ? also is there a link where to buy the kit, all i find are pre-orders. TIA

[dave56bug]

The stock tires are very gummy feeling, pretty soft, I just built them no foams and no holes in rims so they are air tight, I've already picked out the set of aluminum beadlocks and tires I want to run, I cannot use my Mayhem beadlocks because the offset would make it too wide.

The hardware? It is all standard black oxide hex, and button head philips.

I got my kit on Ebay.

[John]

The stock tires are very gummy feeling, pretty soft, I just built them no foams and no holes in rims so they are air tight, I've already picked out the set of aluminum beadlocks and tires I want to run, I cannot use my Mayhem beadlocks because the offset would make it too wide.

The hardware? It is all standard black oxide hex, and button head philips.

I got my kit on Ebay.

I would check to see if the aluminum beadlocks will work. The stub axle length is short on the stock Kyosho wheels and some of the aluminum wheels RCP Crawlers had yesterday did not allow the stub axle to penetrate the wheel enough to spin a nut on. If you look at some of the pics of the Kyosho wheel, you will see that the stub axle threads only go in about half way on the outer nut.

[dave56bug]

Yeah, I might have to look into drilling out a 12mm hex from a different kit, or seeing if there are some that will work.

[John]

Yeah, I might have to look into drilling out a 12mm hex from a different kit, or seeing if there are some that will work.


There are a few issues with that. The hex PIN Kyosho uses is thick and may be bigger than what is used on most 12mm hexes from other kits. The Kyosho PIN is also longer than the width of the 12mm hex. Kyosho beefed up the wheel hex by adding a thick flange to the back of it to accept the large hex PIN. That is why you lost thread length on the outside of the wheel.

Unfortunately, I think an aftermarket longer stub axle is going to be the one fix for those running thicker aluminum rims.

[killjoyken]

I'm almost done with my build and should have it ready for testing against my GC1 tomorrow. Good news is that I bolted up a Proline 8 shooter and it fits the hub perfectly. The stub was only able to thread about half way into the stock nut, but some locktight will keep it from backing off. I plan on testing it with the weighted Prolines and some Claws. I'll probably save the stock tires for something else once I buy some foams for them. IMO, the wheels are too wide for crawling anyway.