Randal clone electric rear truck (+ torsion)

[sk8norcal]

starting a new thread on this truck,
potential low cost and easy build for diy'ers based on existing Chinese eboard parts.

just need to find a vendor that doesn't charge ridiculous prices...

i.e.,
rear truck + bracket
$85 usd + $50 usd
http://fiikelectricskateboards.com/spares/high-performance
(they are selling a single randal clone frt truck for $70usd )

their "kit" $999usd
http://fiikelectricskateboards.com/boards/electric/electric-skateboard-kit-500w-detail

randal clone rear truck
found one here,
$30 aud

http://www.epicskateboards.com.au/#!long-boards/crkq

i see more and more chinese boards with this truck...
epic
evo-skate
electroskate
fiik
skatetek
maverix

(china vendors)
raldey
http://www.electricskateboard-shop.com/
http://raldey.taobao.com/
autoskate
http://www.autoskateboard.com/
http://www.alibaba.com/product-gs/442298103/280W_electric_skateboard_with_brushless_motor.html
http://autoskate.taobao.com/
bestar
http://cnmotor.en.alibaba.com/product/220260899-200095196/400W_CE_approved_Electric_Skateboard.html
elite
http://e-skateboard.taobao.com/

someone can make a cnc motor bracket for this RKP truck, (randal clone)
i see them on raldey and evo-skate
i dislike torsions in the back and for going fast in general.

 

[sk8norcal]

i guess i will add rear torsion truck too,

http://fiikelectricskateboards.com/spares/high-performance

china vendor,
http://endless-sphere.com/forums/viewtopic.php?f=35&t=53674&p=814532#p811585

 

[sk8norcal]

http://www.diy-robots.com/?p=1235

 

[Barndom]

Why is so many of the common chinese type e-skatebords, like fiik f.x, equipped with torsion trucks? What is the benifit with them?

 

[sk8norcal]

because they are all copying the original exkate/altered design.

advantage of the torsion design, "turnier", more responsive.
disadvantage, more wobbly at speed, cant adjust the bushing (replace), rougher ride.


I only use my exkate as front truck, on a low speed pump setup.

 

[Barndom]

Thx. I don't have much experience with other trucks than my torsion trucks on my chinese electric skate board. They are indeed wobbly at speeds over 25 km/h or 15 mph. And they also feels rough to ride on other then perfect tarmac. The base plates are mounted with 4 alu distances to the board, I changed the rearmost of the two distances on each base plate to two pieces cut from rubber hose and it feels like it did get somehow better.

When we are on the subject. What are the benefits of suspension trucks common on mountain boards?

I also have an idea of a kind of truck that I have not yet seen. It shall in theory get the movement for steering, provide spring back force and act as a vibration damper. All thoose three from one piece of rubber = simple.

 

[sk8norcal]

What are the benefits of suspension trucks common on mountain boards?

mtboarders call them "channel trucks"
shouldn't be called "suspension trucks" because they offer no suspension.

benefits, not sure... i dont mtboard.
more of a preference thing, spring vs bushings.
I have skate trucks with springs (seismics), and I don't care for how they ride.

I also have an idea of a kind of truck that I have not yet seen

well, I have seen lots of truck designs.
if u want, send me a pic, I can tell u whether its been done before.

http://wackyboards.blogspot.com/2009/09/22shoe.html
http://wackyboards.blogspot.com/search/label/%7Dskate%20trucks

 

[Barndom]

I know this is going off topic now but it also feels a bit unnecessary to start a new tread.


I'm happy to sharing my idea on a public forum. Im pretty sure it already exists as a prototype. I think this is the same: http://www.freepatentsonline.com/6679505.html . I have no drawing yet so I will try to explain:

Essentially it is a channel truck, but with a rubber bushing between the hanger and the base plate. The outer part of the bushing is fixed to the hanger and the inner part is fixed to the base plate. The same way a sway bar on a car is attached. All the movement is in the twisting of the bushing, there's no gliding or sliding involved. Since the rubber bushing sits between the hanger and the base plate it is shock absorbing.

Possible pros: Chock absorbing. Simple and cheep (no springs is needed). No lubrication. No play. Small wear.

Possible cons: No adjustment. Unpredictable behavior since the angle can vary to some degree through the rubber.

 

[sk8norcal]

sounds sort of interesting,
i think the hard part is how u gonna bond the metal to the urethane?
(i looked through the patent u linked, but its hard to see exactly what is going on in those sketches)

i think the ground industries truck is similar to what ur saying,
not 100% sure on that.
http://wackyboards.blogspot.com/2009/07/ground-industries.html

most mtboarders use the channel/spring truck design, they don't worry about shock absorption of the truck because of their air tires and flex deck.

in the longboarding world, the RKP/Randal design is predominant.
It's simple and works well, and it has shock absorbing quality.

 

[Barndom]

Thats the one! The G.I. Bionic truck is exactly what my vision was. Altho inverted from my description but works the same way.

To get back on topic. Those RKP/Randal copies looks to work better than the Torsion design, at least for me.

 

[MauiCruzer]

Hello,
I have a 600 V2 altered electric skateboard, and I need to replace the torsion bushings with something stiffer. Unfortunately, altered is nearly impossible to contact presently, and their website doesn't allow me to order bushings. So, I'm wondering if anyone knows if these ZBoard torsion bushings will likely fit my board.

http://www.zboardshop.com/products/set-of-torsion-bushings

 

[LEVer]

They will. They are the same exkate torsion trucks. Not sure about the V3 though.

 

[NormRD]

I actually have both a Chinese made board and was able to pick up these trucks cheap of ebay so used them for my DIY.

The main issue is it requires quite a bit of modification if you plan to use your own motor. Lots of dremel and drilling.

For a DIY I would suggest just going with the trucks "torqueboards" (http://diyelectricskateboard.com) makes. I have recently replaced mine with these on my DIY board and wish I just started with those. Easier and just works better.

 

[sk8norcal]

interesting, i see zboard have dumped the exkate/altered torsion truck and replaced it with a randal-style longboard truck.

not available separately on their site..