speedy_w_beans

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Everything posted by speedy_w_beans

  1. speedy_w_beans

    So, What Have You Done Today?

    Finished my TT02 and took it for a test drive. For a base-level TT02 with just springs and no dampers, I was impressed with how well it turned in the street. There was just a hint of oversteer. I'm eager to try a few speed runs, but unfortunately there are a few issues to work on still. First, the steering seemed slightly sticky and won't return to center perfectly. The car wanders right or left depending on the last turn taken. Not good at higher speeds. Second, the motor seems down on power. I calibrated the ESC against the radio and confirmed all settings, but I expected to be at half throttle for the speed I captured, not nearly full throttle. There doesn't seem to be more power on tap like I expected, even though the power analyzer did show a peak of 190A. I have a motor analyzer and a program box for the ESC, so there's some work to do here. Finally, and most alarming, there was a moment when the car seemed to take off full throttle on its own for about 50 feet and I was steering it just to avoid any hard obstacles. Then it stopped! There shouldn't be any technical reason for this to happen, and I'm second guessing whether I might have bumped the throttle; my memory is a little hazy around the incident. I'll do some more test runs to gain some confidence it won't take off into a curb. The power analyzer, GPS, and thermometers all worked well. It was handy to have max current, max power, and min voltage captured. The GPS seemed to capture max speed fine. The thermometers were handy because I could look down on the car and make a decision whether to do another run down the street or not. After a half dozen runs the motor and ESC hit 50C, so I called it quits for the day.
  2. speedy_w_beans

    58673 Comical Frog

    Just saw the headline on TamiyaBlog.com. No pictures yet. Will all the buggies get the comical treatment? What say the hive?
  3. speedy_w_beans

    So, What Have You Done Today?

    More progress on the TT02 today. I printed a long/wide battery strap to make a mounting surface for the power analyzer; it replaces the kit battery strap. I also printed a mount for three digital thermometers; it slides over the body posts and provides holes so the thermometers snap into place like standard panel mounts. The thermometers were only about $2/each and will keep eyes on the battery, ESC, and motor. Just one more mount for a motor cooling fan and to tidy some servo wiring, a little soldering, and it'll be time for a test run.
  4. speedy_w_beans

    How do you organise your spares?

    I bought several clear plastic storage tubs from our local home improvement store (Home Depot), and started organizing parts along a few lines of thought: There are a few tubs with tools in them; these include all the hand tools, soldering tools, measurement/setup tools, inspection tools, specialty tools, etc. There are some tubs with groups of related generic parts. For example, all the buggy tires and wheels are in a few tubs. All the on-road rubber tires and wheels are in other tubs. On-road foams are in another tub. 1/8 scale buggy and truggy wheels and tires are in other tubs. I have a tub or two of dampers, oils, springs, and bumpers. There's a tub of generic parts, like fasteners, O-rings, bearings, pinions, etc. I have tubs specifically for brushed speed controls and motors, brushless speed controls and motors, wiring and connectors, and receivers/servos. There are some tubs reserved for specific chassis, such as TRF201, DB01, TA05, TB03, non-Tamiya, and 1/8 scale. These tubs include chassis, spares, and hopups. I guess in general most of the chaos falls into three categories -- tools/supplies/paints, generic parts for any model, and model-specific parts. The clear tubs make it easy to see what's inside and it kind of jogs my memory when I'm looking for things. I do have a tool box for my most commonly used tools, and a tool bag for taking things to a field or parking lot.
  5. speedy_w_beans

    So, What Have You Done Today?

    Designed and printed a GPS tray for my TT02 today; it takes the place of the kit upper bumper cover. I have an XL urethane bumper to install in lieu of the drift bumper. The GPS is held in place with some Velcro plus the body lightly pushes down on it too. This also provides the added benefit of keeping the body's nose from folding under at speed. So I'm pretty pleased with this as the GPS is protected inside the body yet is still visible for filming/photos. I have some other designs in the works for a battery strap and a fan/wiring mount; hopefully I can get to those tomorrow.
  6. speedy_w_beans

    Bulk Screws vs. "RC" screws

    @Juggernut, in your original post you say you're looking at M3x12 stainless tapping screws, but the photo of the listing seems to show machine screws. Which are you after? Just trying to save you from a regretful purchase...
  7. speedy_w_beans

    So, What Have You Done Today?

    Worked on my Tamiyaclub "Motion" contest entry. It took a bit of trial and error, but I was finally happy with this TRF801XT shot...
  8. speedy_w_beans

    Trf 415 msxx mr edition

    I see some old chatter on RCTech announcing the Mazdaspeed 6 body around November 2006; AMain Hobbies seemed to start carrying it in January 2007. So, I guess it's possible Mr. MR may have had access to it for his use. Color-wise, I have no idea. The body pictures I see make it look like the body was airbrushed, which likely means non-Tamiya colors by whoever the artist was. You'll have to do your best to grab images and experiment with different paint to get the same tones.
  9. speedy_w_beans

    ORV diff fix - potential problem

    This seems like the ultimate solution: Oldfrogshot's Screw Mod
  10. speedy_w_beans

    Trf 415 msxx mr edition

    MSXX MR Edition These instructions are supplementary to the base MSXX instructions. MSXX Base Instructions Tamiya Manual Page
  11. speedy_w_beans

    stadium Blitzer loud transmission

    How's your motor pinion? Is it the original aluminum one? If so, how do the teeth look? The typical kit aluminum pinions can wear, and the teeth take on a sawtooth shape leading to some extra noise from the gearbox. Steel pinions are available and wear a lot better over time. Also double-check your pinion tooth count vs. motor mounting holes. If the axle stubs seem to be running true then your wheels might be slightly warped; that's not all that unusual especially on a used model. I wouldn't worry about it much.
  12. speedy_w_beans

    The "postman Brought Me" Thread

    I liked my 3Racing M4 Sport chassis so much the postman brought me another one today...
  13. speedy_w_beans

    stadium Blitzer loud transmission

    Dog bone rattle? What happens when you remove the dog bones and run the transmission without them? Also, the video shows the wheels have some runout, but what about the tips of the axle stubs themselves; do they run true?
  14. speedy_w_beans

    Trf 415 msxx mr edition

    Nice piece of history! Something to tease you (link).
  15. speedy_w_beans

    So, What Have You Done Today?

    Wouldn't the TA06 be the perfect 2WD touring car as it is currently set up? The placement and direction of the battery makes it pretty good from a mass centralization / minimum roll inertia perspective. The rear transmission is sealed and all gears, too. You could almost build this chassis as-is and just leave the center belt, front belt, front diff, and front dog bones out of it. The TA06 didn't get much love when it came out, but it could carry some corner speed and did well if someone worked with it. This YouTube video made an impression on me; the TA06 starts out in pole position and just keeps growing its lead the whole time. In particular, the way it handles that really tight turn in the middle of the track is impressive. I think people gave up on the TA06 and turned them all into drift cars a little too quickly. Much like the DF03 buggy chassis, the battery and motor are along the center of the chassis which makes weight transitions due to steering happen a little more quickly. You don't need to move weight quite as quickly for braking and accelerating; weight transfer due to steering should dictate component placement in a chassis in my opinion. I was thinking the other day that things are starting to get cyclical with touring car designs: The TA07 is much like a Losi XXX-S with the single center belt. Granted the chassis structure is different, but the drivetrain concept is very similar. The TB EVO7 kind of looks like a throwback to the TB03VDS with the front motor mount option and central stiffening spine. Again, a different chassis structure, but a similar drivetrain concept. I randomly ran into a posting about someone making a central motor option for Xray T4 touring chassis; this is basically a throwback to the TA05 design (link). Are we constrained by component "standards," e.g., 540 motor size, full and shorty hard case LiPo sizes, standard and low profile servo sizes, etc.? What can you do if you start robbing components from airplanes, helicopters, and boats? Sorry, just a bit of rambling / random musings... I'm intrigued by the thought process each designer went through when he designed his own touring car.
  16. speedy_w_beans

    Racing Sparrow RS750

    Nice work with the lead pouring. Really a nice project through and through!
  17. speedy_w_beans

    So, what have you done today?

    I can relate to how draining face-to-face interactions can be. I love engineering and I love being "in the zone" working on a design, but as I was promoted up the ranks to project leader, department manager, and technology strategist the quantity of meetings and emails shot up exponentially. All of this overhead time spent guiding people, answering questions, thinking about the future, putting out fires, making tradeoff decisions, etc. just wore me down. Especially chasing after people who weren't performing. It really did feel like a daily drag; I couldn't wait for the weekends and I groaned every Monday morning. Fortunately, my employer did me a favor and made me redundant a year ago after 15 years of service, and I've been taking a career break for this past year. I'm just starting to feel like coming back to the workforce again; I was mentally exhausted and needed to work on house projects, car projects, hobby projects, etc. to enjoy some quiet time and let some feelings go. I wish you the best of luck in your new position; I don't have any words of advice. All I know is when the number of human interactions goes up substantially it can definitely be draining. I had to set some hard limits to survive and needed some off time eventually.
  18. speedy_w_beans

    So, What Have You Done Today?

    A few days late and a few dollars short... Two weekends ago I posted about cleaning out my daughter's bedroom and erecting shelving for my wife's fabric and my RC stuff. It was easy enough to get the long-term NIBs up on the shelves and out of the way. This past weekend I spent the better part of a day cleaning up my work area and the room immediately next to it; some short-term NIBs, some projects in process, and several bins of parts, wheels/tires, electronics, and tools found their way onto the shelves as well. It was really nice to de-clutter these two rooms and enjoy the feeling of more open space again. Things had gotten out of hand and there were so many loose items in my work area and the adjacent room that I didn't even feel like working on RC cars anymore; now there's some room to spread out and make some progress again. Maybe some of you can relate to the clutter/motivation conundrum?
  19. speedy_w_beans

    Teu101-BK and 104BK Speed controller help pleaseee!

    If you can get a TEU-104BK to work with your battery, motor, receiver, and radio properly, and the TEU-101BK doesn't work (assuming it is installed the exact same way as the TEU-104BK, and you're using the settings button the same way), then I'd have to assume the TEU-101BK is broken. The button might be broken, or maybe even the power electronics that run the motor are burnt even though the microcontroller that's inside is still blinking the LED. Probably not worth your time given new brushed ESCs can be had for as little as $10 these days (example). Is the WP-1040 working for you then?
  20. speedy_w_beans

    Teu101-BK and 104BK Speed controller help pleaseee!

    Looks like there is no button - Manual. You wait 3 seconds with the throttle in neutral and it self-calibrates. Options are set with jumpers.
  21. speedy_w_beans

    Teu101-BK and 104BK Speed controller help pleaseee!

    Maybe the setup push button on the TEU101 is broken; I've had that happen to one TEU in the past and I simply tossed it. Check out Hobbywing's Quicrun brushed ESCs.
  22. speedy_w_beans

    Lble02s low volt cutt off

    What value of resistor did you install, and did you install it between the battery positive terminal and the ESC? You can measure voltage drop across the resistor with a meter while the model is running; put one lead on each terminal of the resistor and read the value. The voltage drop will not be constant, though; it depends on motor current which in turn depends on how much load the chassis sees. Wheelies, fast starts, driving through tall grass, going up hill, etc. will draw more current and cause a higher voltage drop than a model suspended in the air or coasting/cruising on a flat road surface. Therefore your cutoff voltage for the battery pack keeps changing with driving conditions. All that current flowing through a resistor is turned into heat and is energy that didn't make it to the motor. As others have suggested, a LiPo cutoff alarm is the better route.
  23. speedy_w_beans

    Super Astute pinions

    Tamiya makes a range of 0.5 mod pinions for the DF-03 chassis (Dark Impact/Keen Hawk/Avante MkII). Also, some RC helicopters use 0.5 mod pinions; Hobbyking has some if you search on "0.5 pinion."
  24. speedy_w_beans

    So, what have you done today?

    Today I put the final touch on our minivan's maintenance and repairs. Recently I changed all the rotors and brake pads, replaced a damaged fender liner, replaced a temperature control motor for the HVAC, replaced a stuck seat belt, fixed glove box and door trim rattles, and did a full fluid and filter swap. We were driving somewhere at night and I noticed the light bulb illuminating the shift lever markings was flickering and ultimately burned out; today I put a new bulb in the center console, and our 170,000 mile / 270,000 km Honda Odyssey is nearly perfect again! In celebration of 9 solid years transporting the family everywhere comfortably without any major problems or failures: Also, I celebrated another small milestone today. After a year of ripping, transcoding, organizing, storing, and backing up all sorts of video content, the last video was transcoded and stored today. Virtually every piece of disc media in our house is now available on our home network including all of our music, videos, and Playstation games. All the Hi8 and digital camcorder footage of the kids when they were young is on the network now too. The last goal is to scan the thousands of paper photographs we have in albums and get those on our home network. All of our phones, tablets, PCs, and Playstations will be able to access this content at home. It's going to be so nice not having to access and manage physical media (finding what you want, putting it away, trying to keep it in order, etc.).
  25. speedy_w_beans

    The "postman Brought Me" Thread

    The last of the electronics, some thermometers with remote sensors, showed up today for my TT02 speed run car. The game plan: The LiPo will pass through a Lemonhobby 180A power analyzer and capture minimum voltage, maximum current, maximum power, and energy consumed for the system. After the power analyzer, power will split between the ESC and a 6V/3A BEC. The BEC will feed a 20A power analyzer to capture minimum voltage and maximum current of the downstream receiver, gyro, and servo. I'll remove the BEC power wire from the ESC and just have signal and ground running to the radio receiver so it doesn't conflict with the external BEC. The ESC BEC will probably power the motor cooling fan. The ESC will have its phases and sensor wire connected to the motor. Three thermometers will measure battery, ESC, and motor temperatures. The GPS will capture top speed. Hopefully I'll get some interesting data. It's going to take some creative packaging to make it all fit.