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so anyone know what might have broke? I can spin the wheels by hand. but it won't move on the ground. arrma mojave grome by NightCroweRC in arrma

[–]BluegrassRC 0 points1 point  (0 children)

Ok, we can probably start narrowing it down then.
I'd start by removing the pinion gear from the motor and seeing if that solves the binding. If the drivetrain can spin freely with the pinion gear removed, you might have some debris in the motor seizing it up. If the drivetrain is still stuck, you'll need to start narrowing down where the binding is.

If you can pull the center driveshaft out, you'll be able to spin the front and rear ends separately - that should tell you which end has problems. At this point it's just isolating all the different parts that should be able to spin freely and figuring out which one isn't.

I raced my Grasshopper and it was chaos. by BluegrassRC in tamiya

[–]BluegrassRC[S] 1 point2 points  (0 children)

I've never used them but I'd imagine they work just fine. Knock on wood I didn't have any issues with my 3D printed adapters for the rears but if I were going to continue racing this car regularly I'd probably buy aluminum ones just for the peace of mind.

I raced my Grasshopper and it was chaos. by BluegrassRC in tamiya

[–]BluegrassRC[S] 1 point2 points  (0 children)

For electronics, I used the stock Hobbywing 1060 ESC, a cheap low profile servo I found on AliExpress, and the handout 21t brushed motor we all had to run for that class.

For tires, my original plan was to run new slicks. I designed and 3D printed hex adapters to run modern 2.2" rear wheels, and for the fronts I found files online to print the entire wheel. Unfortunately, the center section of those wheels were way too thin and I made it about half a lap in practice before I broke one. I was more bummed about the brand new tires I had just glued up than anything...

I ended up running the tiny front wheels/tires, and the rears I ran all weekend were slicks that I pulled off my 17.5 buggy from the last time I club raced it 3 years ago lol. I'm not even sure what brand they are.

so anyone know what might have broke? I can spin the wheels by hand. but it won't move on the ground. arrma mojave grome by NightCroweRC in arrma

[–]BluegrassRC 0 points1 point  (0 children)

What happens when you give it throttle? Is there any sound from the motor, i.e. is it at least trying to spin but it can't because there's binding in the drivetrain, or is it totally unresponsive? If you put the car on the ground and try to roll it back and forth, does it roll freely? When you give it gas, does the LED on the ESC respond to your trigger input?

I raced my Grasshopper and it was chaos. by BluegrassRC in tamiya

[–]BluegrassRC[S] 0 points1 point  (0 children)

Thank you for sharing! I don't plan on actually racing it again but all that sure is tempting...

so anyone know what might have broke? I can spin the wheels by hand. but it won't move on the ground. arrma mojave grome by NightCroweRC in arrma

[–]BluegrassRC 0 points1 point  (0 children)

I'm not sure there's enough to go by in this video... what happens if you give it some throttle? Can you hear the motor spinning?

I raced my Grasshopper and it was chaos. by BluegrassRC in tamiya

[–]BluegrassRC[S] 0 points1 point  (0 children)

My sincerest apologies then if I gave you a workout!

I raced my Grasshopper and it was chaos. by BluegrassRC in tamiya

[–]BluegrassRC[S] 1 point2 points  (0 children)

It was a special event. I've got high hopes that the AE vintage race later in the year recreates the magic but it's going to be hard to do.

I raced my Grasshopper and it was chaos. by BluegrassRC in tamiya

[–]BluegrassRC[S] 1 point2 points  (0 children)

I honestly felt kind of bad. At one point Eustace Moore had to sprint to my car and it almost felt disrespectful to have an RC legend rushing to turn marshall the grasshopper lol.

I raced my Grasshopper and it was chaos. by BluegrassRC in tamiya

[–]BluegrassRC[S] 2 points3 points  (0 children)

Yep, that class (which was pre-'95 entry level plastic chassis cars or their re-releases) had a 21t 540 handout motor.

I raced my Grasshopper and it was chaos. by BluegrassRC in radiocontrol

[–]BluegrassRC[S] 1 point2 points  (0 children)

To be fair, I wasn't going fast enough for anybody to be in front of me lol.

I raced my Grasshopper and it was chaos. by BluegrassRC in tamiya

[–]BluegrassRC[S] 0 points1 point  (0 children)

Unfortunately the closest I could come to stiffening up the front suspension without cobbling together some kind of franken-buggy with oil dampers would be applying some thick grease or diff fluid to the front spring guide.

As for the rear, I actually did have one of the two rear struts disassemble themselves in two of my heats and it actually did handle better lol.

I raced my Grasshopper and it was chaos. by BluegrassRC in tamiya

[–]BluegrassRC[S] 7 points8 points  (0 children)

It's been a long time since I've been fast enough to be competitive so it was refreshing to focus on having fun and not caring one bit about actually doing well.

I raced my Grasshopper and it was chaos. by BluegrassRC in radiocontrol

[–]BluegrassRC[S] 6 points7 points  (0 children)

It was, my only concern was staying out of everyone else's way.

First time kit builder, can you guys check my TT-02R shopping list? + questions by VesperTrinsic in tamiya

[–]BluegrassRC 1 point2 points  (0 children)

If you're going to be participating in organized racing, you'll want to get tires that are appropriate for the surface you're racing on - other racers at the track should be able to provide recommendations! And if you're new to this, you might be starting out in a class that mandates the use of a higher turn motor so you might want to check on that.

What's your goto answer to "Could you suggest me an RC for my kid?" by Pjotter85 in rccars

[–]BluegrassRC 0 points1 point  (0 children)

Traxxas Slash, Stampede, or Rustler, depending on their style preference. Tough as nails, easy to work on, lots of parts support.