3139 replies to this topic

[Preston M]

Thanks Dom. Forgot to add

Rails are .063 two soldered together on both sides then the forkish rails. Limited floppy movement mimicking something Van Peenan does with his pans. This style provides a nice small amount of movement, and in my opinion, is easier to build than the normal style floppy. Depending on final weight I may trim the wings off the front and lighten the bracket more. Shooting for as close to 100g as possible without sacrificing handling.

[slotcarone]

Preston that is a beautiful chassis and your workmanship is second to none!!! If that were my chassis I would also add a brace to the motor bracket uprights and a guide tongue reinforcement. Nice Job!!

[Duffy]

First Hot-Solder-On-Wire action I've had in a month, and gentlemen, it felt good. - What I still haven't got is a computer I can get you decent graphics from, so you may need to use your imagination here. Sorry.



"...Comm Killee-Killee-Com Commm, ' Walk on Gilded Splinters..."
55.4gr. naked, brushed not tumbled.



Six rails & perimeter wire .055, rear loop/pan catcher .063, all other .047. Duffy bracket, Chicagoland steel tongue & Speedzone custom drillblanks. Stay-Brite solder, Brazil Santos coffee. Lots of it.

Duffy

[Gator Bob]

'Drive thru' the smoke, Duffy.
I'm going to get me a wedge of re-fried euro Pie from Mrs. Fillmore.

Looks like a Great high wire act with free admission.

Marshals beware the trees are bare and ... um..... only the leaves have tumbled.

[Tex]

Now, who went and told Duffy he could exercise his imagination?!?!


Niiiice! Of course, give us a track report when you can. Inquiring minds gots ta know. But be humble about it. An' watch out for that pie; ya may need a doctor later.

[Duffy]

The Doctor called first.

EDIT: I actually wasn't aware of Humble Pie's cover of this (and why'd anybody want to attempt it?) until yesterday. I'm kinda an arrogant snob about that era, especially concerning the second-generation spinoffs like Humble Pie or Foghat, and I got some mighty big blind spots as a result. I don't claim it's right, I just claim it's me.

Now let's talk about chassis again.

Duf

[Rick]

Some fancy pants bending there Duffy.................nice work.

[endbelldrive]

Focused center mass with a bit of whip and flex in a good spot...motor nice and stable sitting on top of the brass plate...nice departure from standard designs.

[Gator Bob]

Looks like a work of art, "the Wizard of the Wire"

Excellent. Hope it handles for you like it's holding a long pole.

Way to go... Duffy !

Question ... why no axle tubes?

[RichardE]

Going to take a week or more to digest all the fine points of that chassis and send my analysist into a new tax bracket along the way! LOL

Richard

[Duffy]

Question ... why no axle tubes?

There was a healthy discussion elsewhere on this subject from two-three months back. It came down to two camps on that, and I'm in the "the Party of 'No'..."

Chassis engineering basically works down to a game of what's-gonna-break-first. My rear end philosophy (keep yer snarky comments to yerselves) is based on my own experience of what's failed me, and early on when I had axle tubes come adrift I tried setups that didn't include 'em. No axle tube equals no broken axle tube. That worked for me, so I kept doing it.
Likewise with other things that could go wrong: Wire bales that run across the top of the bracket to brace the tubes outboard just add another three joints that can break, and in places not real easy to detect. Wide brackets? The wide motor face (and your natural desire to remove material from it to cut mass) makes for another place to distort, requiring a re-thinking of bracing in the surrounding structure.
Another consideration has to do with axle breakage. The thread I mention discussed this, & it worked out to where you put the possible stress risers and whether you use an axle that will bend, or one that might break. I decided against wide placement of bearings, which focuses impact stress right out by the wheel, and opted for inboard bearings & collars which I thought allowed some distance for a drillblank axle to whip and flex on impact, spreading out the stress riser.

It's just the way I chose to go, with my builds. Borrowing the Prof. Fate line about Rules, "All CHASSIS are built out of Fear." Like going through all that stupid wire-bending because I'm not able to sus out where it's safe to put a solder joint, I just live with a level of craziness that I can handle.

I'm intending this for fast big tracks, & I'm starting out plotting out a softer sled today. I'll get back to you guys when I've blooded this one.

duf

[Gator Bob]

There was a healthy discussion elsewhere on this subject from two-three months back. It came down to two camps on that, and I'm in the "the Party of 'No'..."

Chassis engineering basically works down to a game of what's-gonna-break-first
duf

I have a tendency to get involved in the un-healthy discussions so I missed the 'yes vs. no tube story. I'll look for it and it might change my mind ... but probably not.
I'm hip to the scare 'whatz gonna break first'
Since we build out of fear I get comfy with the tubes, bearings in place keeps me feeling safe that the axle is perp to the centerline.

Oh....yes.... 3/4" with tubes out is my favorite choice with the first set of rails all snuggly to the power plant.

O-boy I just had a new idea.... I love slot cars

[Preston M]

Another RGEO build:

This one is very similar to my last,but instead of all .063, this on uses a .078,.055 combo. It is stiffer than my last, but i kept a little more play in the pans. I also cleaned up the design of the inner "fork." The last car RTR came in at 101g... perfect. It handled like it was on rails both at SAL and PJR, so i figured i would build a similar car, with some changes geared more towards a high speed track.

[Duffy]

Noyce, Flex.
Isn't it cool when we start "seeing" the demands & uses of motion and stiffness in different settings? The building thing is just fascinating to me, & I've only just started to understand bits of what's there.

duf

[Preston M]

I really enjoy building. It's an amazing feeling when a chassis built by yourself work.

[Preston M]

Works*

[Greg VanPeenen]

Works*

Great build Preston.

[Joe Mig]

I just finished this IRRA F1 chassis in comes in at 55 grams. I built a Can-Am car similar to this but I built this one just a bit stiffer. I just have to clean up the top of it so it looks better.

[Preston M]

Cool build mig. Bring it tonight and lets set it up!

[Cap Henry]

CHR Cars #045 For Frankie Schaffier
JK Kit Tripod
Inner rails are .055, Outer Rails .062
4" WB
JK 1" Hypoid Bracket
Chicagoland Guide Brace
Stops are on the back of the pans instead of the front, something I saw Ed Sohl and Tony P trying.
This car started off as a JK spec car built by someone else, and I turned it into what it is now. So not all the solder blobs were my mess LOL

[Mike Wurn]

Funny "question" by Israelite I wouldn't have gotten it if I hadn't just read the comments fby Duffy from a discussion a "long" time ago on this blog

Beautiful wire work on that chassis Mr Duffy!!! I am off to buy stock in Brazil Santos.......

[Cap Henry]

CHR Cars #046 For Frankie Schaffier
Former Swiss Built JK Torsion Car.
8 .047 Rails
Shaker Pans
JK 3/4" Bracket
Chicagoland Guide Brace

[Dominator]

It's been a while since I built a new chassis so here is what I have. I built this up for the Sovereign to be a little more forgiving around the donut. I tested it on the Royal last night at Modelville Hobby and it worked really well even with the wrong tires and gearing.

Bare chassis weight 67 grams
15/16" guide lead
4" wheel base
Outer rails .078
Inner rails 2 pairs of .032
Nose peice is .032 brass
Pans and side wieght .063 brass
Motor bracket is one of the new Swiss X27 motor bracket, horse shoe plate, and coined guide tongue
Total car weight 116 grams

[Tex]

Looks good, Dominic! Let us know how it goes on the Sovereign! Two years ago, I drove that donut when it was attached to a 90' American in Odessa. And that may be the very Sovereign that I drove on in Bellaire, Texas around 1966.

[Dominator]

I know that this was the very first sovereign built. Peter Lentros has the tracks history and trek across America. It's previous address was in Texas so good possibility this was the track you raced on. Since the resurrection Peter has also set up am H.O. version of this track that is just beautiful. Here is a link http://www.usg-jetgr...HO_Raceway.html