| Description: | Dollar has also pressured commodity prices. A stronger greenback usually helps depress prices for oil and metals, which are denominated in dollars, as it makes those commodities more expensive for holders of other currencies. Teck Resources gained $1.48 to $31.46 (Canadian). The Vuurzoon design uses hand power instead of electrical power and thus avoids the low power limitation of Lego electrical motors and battery pack systems. Lego motors without gearing don't go above 2000 rpm at their set voltage/current level and have a high weight to power ratio which is bad for flying. Going over an 8:1 gearing causes a Lego motor to lose so much power/torque that any propellers slow down due to wind resistance (even the most energy efficient light weight two blade electrical propellers has this problem).
The younger students had to make their robot stop in a black square on the roughly fourfoot square course. The older students had to make their car follow a black track in the course. The |