the skirt was the key to doing well in this event, not having the biggest baddest fan. That's kind of the whole point of a hovercraft versus a helicopter, right? I mean, getting good contained airflow efficiently seems to be a bigger factor than just having the most powerful fan.
Is it more difficult to hit target times with a heavier mass vs with a smaller mass? I think that is one of the big questions here. I believe that heavier masses do not make it easier nor harder to hit target times. Opinions?
Absolutely Crtomir! Skirt design is the most important design aspect of your craft. For us, we kept on ramping up our motors, and the craft's lift improved very little. We stopped working on the vehicle for about 3 weeks to assemble the binder, and having done that, we followed the historic progression of skirt designs, and adopted a variation of the "Momentum Curtain" design. Having done this, our craft lifted 3/8ths of an inch! Of course, once we greatly improved the mass, ours lifted 2/10ths of an inch. Skirt designs are huge! And for that reason, I always showed the proctors my shield in a way that prevented other students from seeing our design.
UltamtrixMan (Hey! a fellow Ben10 fan!), I had both a <100g craft (1st prototype, proof of concept) and a 2000g craft, and for the most part, mass doesn't affect consistency (standard deviation). For both of our crafts, the second/third/fourth runs would be 0.1, 0.2, and 0.3 seconds (respectively) off mark (different from the 0.05 I claimed prior, a change in skirt design and build has reduced consistency, in favor of the ability to sufficiently lift 2000g in order to pass lift test for the hardass proctors), which seems to indicate a lack of a relationship between beefyness of craft and consistency.
Build score of 49.88/50 at Nationals!? Slacker!
Shady Side Academy Division C
Hovercraft, Thermodynamics, Chemistry Lab, Mat Sci
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