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-   -   Schumacher Eclipse 4 (https://www.rctech.net/forum/electric-road/1079787-schumacher-eclipse-4-a.html)

h2e 01-29-2021 10:45 PM


Originally Posted by Andy Murray (Post 15746408)
Thanks to everyone offering the nice comments, it's really nice to see people appreciating our efforts! (I'm one of the Schumacher design engineers)
I'll try and offer some thoughts on some of the points:

Hex Lightweight Spool and Hex 1 nut wheel design:
We really wanted to try and maximise the performance potential. Its also important to innovate and keep the class moving forwards. With any luck, other manufacturers will follow on with this and bring an easier age to 1/12 racing in future.

It gives 3 main advantage, its lighter, so improved unsprung mass for cornering improvements and rotating mass, for speed. The wheel flex is improved and provides more equal flex and consistency going into each part of each corner. Its also much quicker and simpler to change tyres.
**The Jt3-38USR and JT2-38USF is a USA spec foam control tyre, although I appreciate some racing with specific brand control tyres will force an axle change to the traditional wheel fitment.

If you don't like the change its fine, there's many options available:
-Run what you have for the axle already.
-Get the eclipse 4 diff set U8171 or specifically bagged for the eclipse 4 traditional wheels spool set U8178 (coming soon).
-Stick with your eclipse 3/ other car / rear axle design

Gigaplex+Erhard: C/F chassis is likely to work better for low traction outdoor tracks, the flexibility and higher centre of gravity tend to create or feel like they create more grip.
We had to release the car with the best suited most common spec. That means medium and high traction conditions for 1/12 racing.
-Gigaplex, this car doesn't have a differential to set, again solid rear axles are becoming the most common/ standard for 1/12 racing, more often than not, so we wanted to include it. *F1 only: For your pain with F1 class diff's I feel your pain. Soon the Icon f1 diff will get a cheap update part which setting tension means only loosening 1 wheel. :)*
-Dan/Robert, thanks, we agree it carries lots of DNA from the Eclipse 3.. Having said that I think from a picture or distance it probably looks more similar than actually is. I think Robert covers it quite well, although theres probably some further differences maybe not so obvious such as:
-the new damper tubes x3 are big bore, more durable but also improved handling consistency and particularly handling in bumpy conditions. They are shorter, and no heavier. So the weight is positioned better.
-For these shorter dampers rear carbon parts are changed to adjust the damper positions, including the chassis to perfect the centre damper length.
-The front kingpin is improved in 3 ways over the eclipse 3 part. It can be fitted to an eclipse 3. The damping lasts longer and is improved as the oil output holes are re pitched and are always now within the hub, at all bump and droop positions. This also prevents excess oil squirting out when damping refreshed. There is a small diameter lip added to the base to prevent the hub carrier sticking when on full droop. The surface finish is also vastly improved for a much smoother suspension action.
-Front flex is adjusted to offer slightly more, and therefore less initial 'twitchiness' with better mid corner steering. This is via both the slightly amended top decks, and front lower beam profile. This lower beam also benefits from nicer fitting sockets secure by o ring rather than glue.
-The mass damper is now compatible in the front end unlike the Eclipse 3 chassis/ front end.
-Although the pod was robust and quite tweak free in the old model, the Eclipse 4 is now even more reliable and less likely to tweak with a new pod base design.
-Various other changes to bring the kit spec in line with most commonly used team driver parts such as the 1.5 camber strap, alloy chassis as standard and chassis location to fit an optional ~1gram 25mm fan mount facing the speed control in the centre of the car.
-New bumper plate to cater for slide in spacers such as MT020034 (montech) for easier front ride height adjustment.
Some of these things are not so obvious when looking at the car at a glance in the images. Yes you could pick and choose which parts you think are worthwhile to you, and update your eclipse 3, just there are maybe more parts than it appears at a glance.

If you got this far, thanks for reading my essay.. :)

Beautiful write-up Andy. As a design engineer, I understand your conflicts between "stick to what people are used to" and "innovate". Only when the performance jump is sufficient, people will accept it. And also only if it is more convenient. As you hit both spots with the wheel/hub design, I am sure that was a good decision.
Schumacher has definitely my interest, because of many unique and well thought-through design features. keep it coming!

TrevCoult 01-30-2021 02:30 AM

Remember, Andy and the rest of the design team have had the unenviable task of improving on a car that has just won two World Championships! Not an easy thing to do. I think he's done a pretty good job. Every single change has the aim of making the car go faster or more reliable or easier to work on, or all of these. Nothing has been changed just for the sake of it.

Syxxstring 01-30-2021 06:57 AM

Ran a half dozen packs in mine yesterday. Car is immediately consistent and ready to drive. A minute but noticeable improvement over my 3. In our Outlaw GT12(25.5 2s) class we use a spec Gravity tire so I'm using the Core spool hubs from my 3 with the spacer.
I'll need to get some parts to upgrade my 3 as a loaner/backup car.

Dan 02-04-2021 06:52 AM

Got my E4 yesterday. No oil filled shocks or a diff to build, coming along very quickly. :D

Airwave 02-06-2021 06:30 PM


Originally Posted by liljohn1064 (Post 15745452)
I've never had a problem with a Schumacher pan car diff. Which I believe they invented.

Was talking about 2WD buggies... You needed a doctorate to make it work correctly... But that's the past.

By the way, I really love to see innovations, but I can't see why hexagons are an innovation. For me it just means that we will have to buy adapters to run most of the races.

gigaplex 02-06-2021 07:42 PM


Originally Posted by Airwave (Post 15749794)
Was talking about 2WD buggies... You needed a doctorate to make it work correctly... But that's the past.

By the way, I really love to see innovations, but I can't see why hexagons are an innovation. For me it just means that we will have to buy adapters to run most of the races.

Your comment literally said pancar diffs. How are we supposed to know you were talking about completely different vehicles?

Erhard 02-06-2021 07:50 PM


Originally Posted by Airwave (Post 15749794)
Was talking about 2WD buggies... You needed a doctorate to make it work correctly... But that's the past.

By the way, I really love to see innovations, but I can't see why hexagons are an innovation. For me it just means that we will have to buy adapters to run most of the races.

By definition, it is an innovation, as it is new in this class. What you mean is "improvement" or "advantage". And it is an Improvement also for sure. So what remains is an advantage - well if you can use it is also that. And you can use it, but not always.
Anyhow -
At least - Schumacher is offering it - others not (yet). Others may follow and the handout tyre in events may also. If not - no disadvantage, just use a 3 hole adapter/axle. What is so horrable about an adapter buy? It just is really small money compared to the cost of a race weekend or event.
I have a little hope the 3 hole system disappears, its unconvenient (and heavier). OK-you cannot use a diff with those tyres. On the other hand, when you need a diff, you would use different tyres. So I see no need to buy certain tyres in 2 versions (hexagon/3hole). This means no problem at all but the advantagges mentioned, thanks to the innovation.

Best regards, Erhard

boysdontcry 02-07-2021 10:31 AM

Hex wheels in 1.12. It s an innovation? Ok but made by Tamiya 10 years ago in the same class.
It s a beautifull car but hex are not new

Airwave 02-07-2021 04:16 PM


Originally Posted by gigaplex (Post 15749825)
Your comment literally said pancar diffs. How are we supposed to know you were talking about completely different vehicles?

Serioulsy if you don't want to use your medium talents to decrypt my messages, just tell me! :lol: More seriously, english is not my mothertongue, but now when I read my message again, I understand where I introduced the confusion, Sorry.


Originally Posted by Erhard (Post 15749827)
By definition, it is an innovation, as it is new in this class. What you mean is "improvement" or "advantage". And it is an Improvement also for sure. So what remains is an advantage - well if you can use it is also that. And you can use it, but not always.
Anyhow -
At least - Schumacher is offering it - others not (yet). Others may follow and the handout tyre in events may also. If not - no disadvantage, just use a 3 hole adapter/axle. What is so horrable about an adapter buy? It just is really small money compared to the cost of a race weekend or event.
I have a little hope the 3 hole system disappears, its unconvenient (and heavier). OK-you cannot use a diff with those tyres. On the other hand, when you need a diff, you would use different tyres. So I see no need to buy certain tyres in 2 versions (hexagon/3hole). This means no problem at all but the advantagges mentioned, thanks to the innovation.

Best regards, Erhard

Honestly I'm not even sure to properly understand what you typed. It is an innovation because this is new, ok. It is an improvement, that I don't understand why... What was the problem with the 3-screws fixation? And finally how can it be an advantage? How would it benefit the driver?
But my main issue there is the fact that you consider "normal" that people will buy adapters, because there price will be reasonable compared to the common race costs... :rolleyes: If it is the case, why haven't you considered to include them in the kit? Finally that's a lot of parts which are not in the kit, for the same price as the E3... :nod:

gigaplex 02-07-2021 05:31 PM


Originally Posted by Airwave (Post 15750186)
Serioulsy if you don't want to use your medium talents to decrypt my messages, just tell me! :lol: More seriously, english is not my mothertongue, but now when I read my message again, I understand where I introduced the confusion, Sorry.



Honestly I'm not even sure to properly understand what you typed. It is an innovation because this is new, ok. It is an improvement, that I don't understand why... What was the problem with the 3-screws fixation? And finally how can it be an advantage? How would it benefit the driver?
But my main issue there is the fact that you consider "normal" that people will buy adapters, because there price will be reasonable compared to the common race costs... :rolleyes: If it is the case, why haven't you considered to include them in the kit? Finally that's a lot of parts which are not in the kit, for the same price as the E3... :nod:

The 3 screw mount is heavier and a pain to work with, it's much faster to undo a single locknut.

abailey21 02-10-2021 05:00 PM

Can I ask, with possibly wanting to get back into on road after an 11 year hiatus.

Why the center dampener tube over the center shock? I remember them being more work, constantly wiping and re-lubing. I’m sure this has been addressed before but I’m just curious beyond the cost perspective.

patorz31 02-10-2021 08:15 PM


Originally Posted by abailey21 (Post 15751557)
Can I ask, with possibly wanting to get back into on road after an 11 year hiatus.

Why the center dampener tube over the center shock? I remember them being more work, constantly wiping and re-lubing. I’m sure this has been addressed before but I’m just curious beyond the cost perspective.

It's to lower the CG.

abailey21 02-10-2021 10:41 PM


Originally Posted by patorz31 (Post 15751602)
It's to lower the CG.

Thank you, I assumed it was and easy answer.

choisan 02-12-2021 06:36 PM

Andy Murray can you please suggest a beginner what needs to buy together with e4? assuming he has no eclipse b4. that will be helpful for those who are interested to get into Schumacher

Erhard 02-12-2021 09:56 PM


Originally Posted by Airwave (Post 15750186)
Honestly I'm not even sure to properly understand what you typed. It is an innovation because this is new, ok. It is an improvement, that I don't understand why... What was the problem with the 3-screws fixation? And finally how can it be an advantage? How would it benefit the driver?...............

Hello Airwave,
i think all the answers have been given before:

- Advantage in wheel change is obvious - 2 Nuts instead of 6 screws. How can you doubt this ?????? Unless you have a screw driver, that turns 3 screws simultaneously - (which is an idea that I had really thougt of :rolleyes: )

- Advantage in operation is well described in the product video. The mass of the whole rear axle is reduced (Which helps the suspension, as it is unsprung mass) and the moment of innertia, which improves acceleration in addition
https://en.wikipedia.org/wiki/Moment...gVsInertia.gif

- Flex of the wheel more uniform, less deformation from roundness, --> better grip

This all comes true in theory and may be significant or not in real operation. But with these cars very small advantages can often make the difference of winning or not.
I found the wheels/tyres is the most important factor for my lap times in the stock class that I run. I assume improvements here are counting.

Best regards, Erhard


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