Physics, thermodynamics, etc, are discovery fields over time. They don't have all the answers of the universe: they're still baffled by the construction of the pyramides...Sleep tight, and Happy holiday weekend to all....

There are some GT12 tracks that allow either motor to be used. You are correct that the gearing has to change and by a lot. This is what I tell people (and it is from testing) All of our motors are fixed timing during a test. Torque is our magic number and every fixed timing motor has peak torque at stall and zero torque at max rpm. That is why peak power is at the center of the rpm range. The motors stator design and rotor strength cause a designed in torque peak. Note the stator design. When I test a motor I find that very low timing shows that max initial torque. As you advance the timing you will get to a spot where that number starts to drop. The magic number in timing is getting the peak rpm up without hurting that initial torque thus generating the best power number and efficiency. I tell anyone using a acceleration dyno (of any brand) that the first second of the pull will tell you all you need to know. Now not being a electrical motor engineer I can only offer some conjecture, the non magnetic screws do affect the field and that is seen in the rpm boost. Team Scream noted that no screws in the stator and no slot for them made a huge difference in that field (it was computer modeled) their motors of that design and others that copied it, time completely different.
Now what does that have to do with the USGT TOUR spec motor. That higher power point is too high to be usable it appears. Gearing low moves the working rpm up out of the torque range. It is like trying to make a diesel rev at 8k. Nothing much there when a load hits. That part is my opinion on why but it based on my torque curve findings on the affect of timing.
Maybe I will see the same thing on screws. Interesting test for sure..

Are you really lumping RC cars in with motorsports? If so, that is completely ridiculous and it's time that someone remind you that you are playing with toy cars. Also modifying something meant to be used as a spec part/motor/chassis/ESC/etc... is cheating. Period. Full Stop. To those of you that insist on cheating, please find another hobby.

peak torque of any electric motor is always from zero RPM. The only time you would see that is at the start or after a wreck making higher RPM just as important. Any additional RPM with the same torque makes for a faster motor. The titanium screws have LESS of an effect on the magnetic fields and that is why you see a higher RPM. They also have less of an interaction with the rotor and the timing board. The steel screws will not add to the magnetic field as they are not part of the coil. Team Scream saw an increase due to there being more material in the coil because room was not needed for a screw to pass through allowing for a stronger field. Team scream also offers non-magnetic screws for those motors so they must recognize an improvement. Honestly you can not compare an internal combustion engine to an electric motor. Both produce torque differently.

it is a Motorsport. Just not as big as other Motorsports. RcLive does a great job covering big races. We have a Governing body and some Racers get paid to race So…… yes it can be considered a Motorsport.

Question: When you were in science class, did you ever build an electromagnet?

The point is that the non magnetic screws don't affect the field, and the stock ferrite ones do (in a negative way).

The first part on a dyno pull is largely noise as the sampling rate (at least on the minipro) is too low.

[QUOTE=gigaplex;16015995]The point is that the non magnetic screws don't affect the field, and the stock ferrite ones do (in a negative way).

I now understand your point. Yes, that is correct.

Hilarious. Just because it's covered by some youtube channel no one watches and has a governing body that is comprised of volunteers does not make it a Motorsport and Racers getting paid does not make it a Motorsport. Stop taking racing toy cars so seriously, the win at all costs even if that means cheating when racing in a Spec Class mindset has sucked all of the fun out of it. You ever wonder why this thread exists, Is R/C Racing Dying Off? Wonder no longer, what's going on in this thread, in USGT, and the mentality that RC Racing should be treated the same as 1:1 racing is the answer. We are playing with toys and with the exception of bragging rights, nothing is at stake

It’s a pretty deluded sense of reality if one thinks that this microcosm of a thread, and the half dozen or so cheaters that incessantly complain about rules and their futility or accuracy on the internet, is actually representative of the global participation.

It’s sad, this forum no longer serves the progressive purpose it once did. The passive aggressive insults are weak, as is the logic that instigates them.
The rest of us are oblivious to the squabble here, and blissfully continue to race and enjoy the hobby in its present form, come what may.

My biggest question is, if the rule is made, there has to be reason behind it, right? Like the blinky rule - that has a big reason. It's to prevent the "esc flavour of the month" and to prevent, best it can, from sneaky esc programming from dominating the races.

But outlawing motor screws, if it shows that no one actually gets an advantage, is odd at best and pointless at worst. Because once you get into the hundredths or thousandths of second, that miniscule advantage can be wiped out by a slightly outside driving line, or a bit of slowdown for traffic.

Now, if it does show a clear advantage, and that can be demonstrated with testing, then it's a sensible rule and should be kept. but not if it's a 'because I said so' rule.

Racing - Optimization = Participation

Y’all can collect your participation trophies on the way out. Group hugs!

I ran a few tests with the number of screws in the USGT motor. Sorry, I don't have non magnetic screws to test with. First up is I measured the inductance with 3, 2, 1, and 0 screws. The inductance goes down with the number of screws. Theory says that a lower inductance will equal less torque and a higher rpm.

Here are the inductance measurements in µh. There are three measurements for the 3 rotor positions
3 screws - 70.0, 74.8, 72.7
2 screws- 67.7, 72.4, 71.2
1 screw - 66.7, 71.9, 70.3
0 screws - 65, 69.4, 68.3

The second test was to measure the rpm output with a small load on the motor using a prototype I have been working on. Obviously measuring with 0 screws is meaningless since nothing stops the timing ring from moving, so I only measured 1, 2, 3 screws. As the number of screws goes down, rpm under a small load goes up.

3 screws = 14229 rpm
2 screws = 14342 rpm
1 screw = 14390 rpm


3 screws:





2 screws:





1 screw:

There is your proof.....Enough said, there is a difference guys...Hopefully you can use some goop to run the motor with zero screws and check the rpms....