From PVC to Piston Cane

[andreazinno]

Experiments are going on....after a brief digression with PVC Pimp Cane (a.k.a. PV-Cane), never tested on ground (just a short run in my living room, going up and down on my sofa ), I've built another Clod chassis, something between a Pimp Cane and a Stick.

The idea has been that of a very simple chassis, like the Pimp Cane is, but where the twisting is not obtained through aluminum elasticity but, instead, in a more Stick-like fashion. However, instead using some links and shocks (like the original Stick design), I've chosen a different and simple approach, using a big spring joining two cylinders, attached to the axle housing, and inside of which an aluminum bar is inserted to stiffen the chassis and allow the twisting.

Here a picture
To be noted that the sping work in 3 different way: through its torsion, allowing twisting; through its compression and extension, giving some shock absorbing capabilities.

More pictures are here








As you can see, either the twisting and the clearance are very wide.

To make better tests, I'm waiting for a springs set of different wire size and pitch. Hopefully, some real tests will be made in the next few days.

Bye.

[feuerradder]

Good idea!!!

You only have to test it on rocks to confirm the good performance.

i seem that the spring is joined with glue strap, you don't have slide with the both axle of the chasis

[braceysdad]

Does the wheelbase change during compression?

[andreazinno]

Originally Posted by braceysdad

Does the wheelbase change during compression?

Yes, with max compression (before the internal aluminum bar reach the cylinders ends) the wheelbase decrease of about 1 inch; at the opposite, with max extensions, the wheelbase grow of about 2/3 of inch.

Bye.

[braceysdad]

Just curious as to if this would be comp legal with the adjustable wheelbase?

[andreazinno]

Originally Posted by braceysdad

Just curious as to if this would be comp legal with the adjustable wheelbase?

Good question ! However the wheelbase is not "adjustable" (at least according to the normal meaning of "adjustable"), in fact any change to the wheelbase is due to the effect of compression/extension of the spring, that can occurs only in very specific conditions and for a very short time.

Bye.

[braceysdad]

Originally Posted by andreazinno

Good question ! However the wheelbase is not "adjustable" (at least according to the normal meaning of "adjustable"), in fact any change to the wheelbase is due to the effect of compression/extension of the spring, that can occurs only in very specific conditions and for a very short time.

Bye.

Valid point, I just did'nt know with the actual "back bone" being able to compress if it would be considered as "adjustable"...

Cool design, none the less

[STANG KILLA SS]

damn i like it! should be an even lower CG than the stick.
due to the 1/2" lower back bone, and lack of shocks.

[Kamikaze]

I would try to limit the flex a bit.

[dieselfuel]

yeah if the flex was limited to 70 degrees or less and it s predictable then it should be pretty successful.

[andreazinno]

Hi, at moment the only way to limit the twist is to use a more stiff spring (I've ordered a couple of them). The challege is to find a kind of full-stroke-lock mechanism without compromise the whole design cleanness

Bye

[Reflection]

Originally Posted by braceysdad

Does the wheelbase change during compression?

Originally Posted by braceysdad

Just curious as to if this would be comp legal with the adjustable wheelbase?

Any standard 4 link design will change WB length during suspention travel to a certain degree

Running droop,your WB will be shorter on full droop. Running all up travel,your WB will be longer at full bump.

[dirk379]

Originally Posted by raptorman57

Any standard 4 link design will change WB length during suspention travel to a certain degree

Running droop,your WB will be shorter on full droop. Running all up travel,your WB will be longer at full bump.

He is correct. When i ran full droop my wb would shorten a 1"

This rig looks awesome! If you could get that spring dialed so you could only flex like 75 degree youd be set.

[Highmark]

boingoingoingoingoingoingoingoing

[PROTOTYPE]

That is super cool !!!

All I would say is remove the skid plates . You might get a few more inches of ground clearence.

[andreazinno]

Well, after some tests I've made some changes.

First, I've mounted a stiffen spring (10mm length, 2,5 wire size) so that the twisting is now less wide than before (however it is important to remember that on a Pimp Cane or Piston Cane the twisting is not limited by a some mechanical part, like for example the full stroke of a shock - the only limit is given by the elasticity of the material: aluminum for a Pimp and the spring for the Piston)

Then I've moved all the electronics on the axles, to have less pieces on the chassis (so it will be easy to change it on the field) and now I have one battery for each ESC (yes, I will probably have different discharge time, maybe the back battery first due to the higher load of the motor, but considering that with my Axiom 85T I should have hours of autonomy, I reckon that this is not a real problem...)

New body mounts has been made (not an easy task using a tubolar chassis that cannot be drilled) and a PVC plate has been mounted just under the chassis to protect the spring and to cross obstacle easier.

Here some pictures:









Hope to do some further test in the next days.

Bye

[H3RESQ]

Originally Posted by raptorman57

Any standard 4 link design will change WB length during suspention travel to a certain degree

Running droop,your WB will be shorter on full droop. Running all up travel,your WB will be longer at full bump.

Actually that is slightly incorrect.

Your wheelbase would be longest when the (lower) links are level. If your compression goes to the point past that you would actually be shortening your wheelbase at both "bump" and "droop".......Since this is tech.

On that note I didn't pay much attention but is there actually a rull saying you can't have adj. wheelbase in Super? or is it just 2.2.
Of course I'm about to go look.

[4link4eva]

IIRC, the rules say that the truck must finish the course with the wheelbase it started with.

[fatbastard]

Originally Posted by Highmark

boingoingoingoingoingoingoingoing

Coming soon to a comp. near you. "the boner chassis"

[1981toyotapu]

Hmm, this is very interesting. I could see this becoming an awesome chassis/stick.