Yeah, the bricks seem to vary a lot. Motors vary, too. At the risk of being (accurately) accused of being pedantic: this is part of the challenge of FLL -- and of life. Things aren't neatly encapsulated, don't always work as claimed, change as things proceed...all good lessons for the kids! -- Phil Smith III Coach, The Capital Girls, Oak Hill (retired) Team 1900 (2002) Team 2497 (2003) Team 2355 (2004) Team 1945 (2005) -----Original Message----- From: First Lego League in Virginia and DC [mailto:[log in to unmask]] On Behalf Of Randy Greene Sent: Saturday, October 23, 2010 2:53 PM To: [log in to unmask] Subject: Re: [VADCFLL-L] Variance in Bricks? I am not sure about the software issue. I have heard of problems in the G environment where the only solution was to rebuild the program on a fresh file, but I have forgotten the particulars of the issue. I have never found the robots able to reliably and repeatably travel a straight line for more than a foot or two. I encourage the students to think about driving to a wall or rely on sensors when they get close to their target... tho my success with helpful questions depends on the makeup of the team. :-) That said, I noted that the softer wheels have a lot more variance and we have maybe eight tractor treads no two of which are quite the same size. The only way to be sure is to experiment with combinations of hardware, tho that discipline too depends on the maturity of the team. -- To UNSUBSCRIBE or CHANGE your settings, please visit https://listserv.jmu.edu/archives/vadcfll-l.html and select "Join or leave the list". -- VADCFLL administrative announcements are sent via VADCFLL-ADMIN-L. Visit https://listserv.jmu.edu/archives/vadcfll-admin-l.html to subscribe.