 | | Re: Newbie has an idea - Nascar style racing?
|
|
(...) The FLL mats have a different material on the back, and I doubt you could actually print on the front. That type of mat would be great for this, but I'll bet it's expensive. Steve (23 years ago, 27-Nov-02, to lugnet.robotics)
|
| |
| | RE: "real" LEGO Hovercraft ? (with/without batteries/RCX "onboard")
|
|
Hi Dan, (...) ok, I think that now everyone knows that I like hovercrafts... never had one... but then, I always liked helicopters and never had one also. hmmm... I just remembered I have a cpu cooling fan laying around... maybe... well, it's (...) (23 years ago, 27-Nov-02, to lugnet.robotics)
|
| |
| | Re: "real" LEGO Hovercraft ? (with/without batteries/RCX "onboard")
|
|
There was an excellent episode of JunkYard Wars where they demonstrated just how easy, relatively speaking, it is to build a hovercraft. (URL) Now piloting it once it's built, there's the tricky part... Dan Novy Technical Supervisor Flash Film (...) (23 years ago, 27-Nov-02, to lugnet.robotics)
|
| |
| | Re: Newbie has an idea - Nascar style racing?
|
|
(...) First Lego League uses a plastic mat made by 3M for their competitions. Every team gets one to practice with when they register. I don't know how expensive it is since 3M donates it to FLL, but it does have several redeeming qualities for this (...) (23 years ago, 27-Nov-02, to lugnet.robotics)
|
| |
| | Re: problem building gcc for brickOS-02.6.09 installation under windows xp
|
|
(...) Don't try to build it yourself in Windows - you'll go insane. Download the prebuilt binaries. (23 years ago, 27-Nov-02, to lugnet.robotics.rcx.legos)
|
| |
| | problem building gcc for brickOS-02.6.09 installation under windows xp
|
|
I am trying to install brickOS-02.6.09 under Windows XP using the latest instructions (version 1.2, 19.09.02). When building the gcc compiler I get the attached errors. Afterwards I notice that I constantly get 'permission denied' when I type any (...) (23 years ago, 27-Nov-02, to lugnet.robotics.rcx.legos)
|
| |
| | Re: compass sensor
|
|
(...) Why do you need the accuracy? Dead reckoning type navigation? Just curious. (23 years ago, 26-Nov-02, to lugnet.robotics)
|
| |
| | Re: "real" LEGO Hovercraft ? (with/without batteries/RCX "onboard")
|
|
(...) Hi, I'm not sure whether this would work or not but one possibility is using an inner tube from a mountain bike tyre. They are strong, reasonably light and look to be just the right size. Also small holes could be made on the inside of the (...) (23 years ago, 27-Nov-02, to lugnet.robotics)
|
| |
| | Re: Polling sensor values with wait_event
|
|
Hi Joe, Thanks for your reply, I guess that is the solution to use in this case. I'll still just get values every 20ms. By changing the timeslice I could have this go a bit faster though. Thomas (23 years ago, 27-Nov-02, to lugnet.robotics.rcx.legos)
|
| |
| | Re: Line following algorithms
|
|
(...) Have a variable remembering if the 'bot found the line turning left or right and try that direction first instead of random. This way the bot will go much fast through long turns but will always seek wrong direction for the first correction of (...) (23 years ago, 27-Nov-02, to lugnet.robotics)
|
| |
| | Re: Another cement mixer......
|
|
(...) Hey! That's a really cool function not seen in a modelteam MOC before AFAIK! (...) I've been considering building a trailer of some sort when mind-planning a few MOC's in order to fit all stuff and still be able to remote control the MOC. Your (...) (23 years ago, 27-Nov-02, to lugnet.technic, lugnet.robotics, lugnet.general, lugnet.modelteam, lugnet.loc.it)
|
| |
| | Re: "real" LEGO Hovercraft ? (with/without batteries/RCX "onboard")
|
|
(...) (URL) is a nice project, they built a human-powered hovercraft that was just able to lift a person from the ground. I read a dutch article on it, they also refer to a few books on hovercraft design. (...) The project above uses styrofoam to (...) (23 years ago, 27-Nov-02, to lugnet.robotics)
|
| |
| | RE: "real" LEGO Hovercraft ? (with/without batteries/RCX "onboard")
|
|
Hi Rob :) (...) Yes, I *think* that's the only way. (...) That's my first approach. I'll deal with motion next. (...) 100% LEGO yes, but I'm planning on using LEGO (maybe ZNAP at first, then a mix of Technic) as the "wire-frame" and then use plastic (...) (23 years ago, 27-Nov-02, to lugnet.robotics)
|
| |
| | RE: "real" LEGO Hovercraft ? (with/without batteries/RCX "onboard")
|
|
Hi Andy :) (...) Well... I tried last night various solutions, with the two types of motors, gearing, LEGO (useless) and non-LEGO propellers and... the best I could do was a contraption that only lifted with a counter-weight (something like the (...) (23 years ago, 27-Nov-02, to lugnet.robotics)
|
| |
| | Re: "real" LEGO Hovercraft ? (with/without batteries/RCX "onboard")
|
|
(...) Several of the original hovercraft didn't have skirts, they were the running board sitting on the ground. There is a simple childrens science experiment to demonstrate the effect. Take a sewing thread spool (the old wood kind work best) and (...) (23 years ago, 27-Nov-02, to lugnet.robotics)
|
| |
| | Re: "real" LEGO Hovercraft ? (with/without batteries/RCX "onboard")
|
|
(...) Actually they don't. You can create a hovercraft that will lift an ordinary adult (say <200lb US) using nothing more than a half sheet of plywood, a 1/4HP vacuum cleaner motor, a shower curtain, some tape, a bunch of 1" washers to keep the (...) (23 years ago, 26-Nov-02, to lugnet.robotics)
|
| |
| | Re: "real" LEGO Hovercraft ? (with/without batteries/RCX "onboard")
|
|
(...) That was the SRN1 - the worlds first working full-sized hovercraft - which (amazingly) didn't have a skirt. You can see a picture of it here: (URL) Steve Baker ---...--- HomeEmail: <sjbaker1@airmail.net> WorkEmail: <sjbaker@link.com> HomePage (...) (23 years ago, 27-Nov-02, to lugnet.robotics)
|
| |
| | Re: Polling sensor values with wait_event
|
|
Thomas, You are mostly correct. However, keep in mind that tasks with the same priority get checked in turn. The first task in the priority chain does not get undo precedence over the others in the same priority level. Example: Tasks A, B and C all (...) (23 years ago, 27-Nov-02, to lugnet.robotics.rcx.legos)
|
| |
| | Re: "real" LEGO Hovercraft ? (with/without batteries/RCX "onboard")
|
|
(...) Basic LCAC design. The air that drives the skirt is -not- derived from the direction fans but rather from the turbine input plenums (those babies will suck as much air in just a few 10's of sec. as goes through your entire house in year). If (...) (23 years ago, 27-Nov-02, to lugnet.robotics)
|
| |
| | Re: "real" LEGO Hovercraft ? (with/without batteries/RCX "onboard")
|
|
A ducted fan approach may work. Ducted fan hovercraft have one or two big fan blades on the back that push the craft forward, but a duct takes some of the air and uses it to fill the skirt. This is probably the "lightest" design approach. Direction (...) (23 years ago, 27-Nov-02, to lugnet.robotics)
|
