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Hey Ez, Kool, (more stuff we got in common) I've just been gettin' more into it...recently :cheers2: Application ...use ...& goals ...ALL have to be "factored in" :thumbsup: Um...OK...what ya think ...of this guys aero explanations? ...& his/their real-world results?

Some drawins' & notes :thumbsup: From my research 1.) A flat floor would "streamline" the underside of the car ...promoting air flow 2.) A flat floor, with a diffuser on the rear ...should promote more air flow under the car ...by making the exit "bigger" 3.) A flat but slightly curved...

Hey Denny, Well...we got's no mountains here in Northwestern Ohio :oops: & I completely understand that my little racers, aren't going anywhere near as fast as ...most any full-size car ...& especially full-size racecars ;) But I'm thinkin' more about efficiency & handling ...& the air...

I've been doin' lots more research ...more thinkin' ...some more drawin' ...& even some CAD (cardboard aided design) modeling Let's start off the new year (2026) with an informational video :thumbsup: * It seems to explain some of the ground effect principles...pretty goodly

More drawin'...just 'cause :cornut: After re-reviewing this (previously posted) concept drawin' I got ta thinkin' ...maybe somethin' like this Some personal commentary: :cheers2: I wasa thinkin' that by "criss-crossing" the (2) roll hoops they would 1.) re-enforce each other...

More drawin' Ta illustrate the "hinge style" that I have in mind ...which is kinda like a door hinge Which would be made of 1" OD steel tube (as the bushing holder) ...& (2) steel plates (as "pad" backing plates) & If the "backing plates" were welded ...to each side of the 1" OD tube...

Hey Ez, To apply even/equal pressure across both backing plates ...maybe we could use a "pivoting" backing plate on (1) side?

Hey WTR, Yup...sound about...right :thumbsup: For personal "clarity" I drew out some leverage options ...& here is some figurin' data/notes...commentary ;) If using a ~6" "pad" ...the ~12" swing arm would have a ~2:1 leverage advantage, over a ~6" backing plate ...&/so, a 2:1 ratio would...

Hey WTR, As far as "leverage" is concerned ...shorter is better?...right? :unsure: & This is about as "short as it gets" (while keeping the motor down low) ...looks like maybe ~12" from axle to pivot point ...& maybe ~10" from axle to motor shaft * Shorter also means ...less trailing arm...

More random ...& maybe sometimes "on topic" drawins' :sifone: Trailing Arm with coil-over shock suspension ...& motor placement options A Teeter-Totter (with solid &/or cushioned options) Adjust/arrange & extend the (above) concept to/for a go kart rear suspension ;) Here is an...

Hey WTR, Thinkin' about everything...I may have had some data "mixed up ...but, I thikn I got 'er more better organized...now ;) * This is another reason I "jabber" & "post"...so much :innocent::devil2: It helps me to think things thru...more better :cheers2: ...& by openly discussing...

Hey Denny, Hmmm...I could probably "swap out" (technical term) the rear suspension (riding lawnmower seat springs) on my Damien kart for (1) &/or even (2) layers of the Closed Foam material :cheers2: But, I kinda think "we" can anticipate what the outcome of those tests would/should be ;)...

Hey EZ, Feeling is mutual...my friend...as we have been "workin' together" for a very long time :sifone: IDK the concept seems to have some merit...ta me ...at least IMO enough to warrant some "real world" testing :2guns: Some more info drawed out :) * Notice, this racer should only be...

Hey T, I've found that sometimes it helps ta draw stuff out ;) Here is a drawin' I did ...& I ain't even gonna try-n-explain :innocent::devil2:

Hey Edwin, Interesting...next time maybe a good idea to use a "spreader plate" on the scale :thumbsup: Thanks for the input :cheers2:

Hey Denny, As a reference, I rounded up & tested a couple of springs They are mostly riding lawn mower seat springs ...so, they are designed to support the weight of an average size human This spring started off at 1" ...with the scale "zeroed" Smashed down to ~1/2" ...& the scale showed...

Hey Denny, The 8lbs. & 40lbs. results, were from a single (2" x 2" x 4") "stacked" sample So, I did some math (or figurin') ;) So, it looks like for a smallish 6" x 6" pad ...pre-load rate (not single, as listed): 72lbs. (driver getting into the racer) ...max-load rate (not double, as...

Hey Denny, I was wondering "where's Denny?" glad ya "chimed in" buddy :cheers2: Hmmm...Denny wants ta see some travel testing :unsure: OK, pal let's test (2) of the 2" x 2" x 1" pieces, "stacked up" :thumbsup: Pic of "stacked' sample with 1/2" of pressure applied The scale only shows ~8lbs...

Hey WTR, I made up a (1/2" x 1" x 1 1/2") measuring "block" ...so, I didn't have to try-n-hold a tape measurer steady for each test ;) I re-tested a 2" x 2" x 1" sample Pic before test/at "rest" Pic of 2" x 2" x 1" sample with 1/2" of pressure applied ...looks ta be ~50lbs. Pic of 2" x...

Yup, I'm thinkin' so too :thumbsup: Sounds like a position sensor, in the motor, "failed" ...so, (1) of the (3) phases isn't working :ack2: & When ran without a load, the motor is able to "skip" over the "missing" phase ...but, when trying to run it, under a load, it isn't able to do the...