Rotor Egg Drop B

[abiagealb]

does anyone know the winning rotor egg drop times for states/nationals for 2013? any links?

[Adi1008]

does anyone know a good way to attach the cup to the rotor device?

I personally use string, but I'm sure there are better ways.

does anyone know the winning rotor egg drop times for states/nationals for 2013? any links?

I'd recommend looking at last year's thread. If I recall correctly, the average time was about 6 seconds (from four stories) and no times over 10 seconds.

[Type]

does anyone know a good way to attach the cup to the rotor device?

What my team did last year and will be this year is attach 3 pieces of string going down the central axis starting at the very bottom, and just put at around this cup and put masking tape to keep the cup and strings together.

[Type]

Anyone know if you having flexible wings means that you can bend them to fit inside the required 51x51x51? Or does it have to be in the form it would compete? One last question, can you move any pieces in between taking out of impound and dropping the device?

[chalker]

Anyone know if you having flexible wings means that you can bend them to fit inside the required 51x51x51? Or does it have to be in the form it would compete? One last question, can you move any pieces in between taking out of impound and dropping the device?

Rule 3.e is pretty explicit in saying the device size limits apply to both launch and flying configuration.
4.b is also explicit in saying no modifications are allowed after impound.

[Bozongle]

Participated at the northridge invite today in Indiana. Just finished our competition rotor yesterday after procrastinating. The height was 4m and it got 2.7 seconds, however the egg cracked on the bottom. I believe it was because we didn't get all the air out of the bag when we put the egg in and it was inflated, or we used too much tape. Either way is that a good time?

[SOCoach]

Do ribs on the rotors (like helicopters) have a noticeable effect on times?

[Skink]

I, too, would like to know about that. I have rarely seen ribs on egg drop devices, so what would be the purpose for using them when they are?

[Adi1008]

Do ribs on the rotors (like helicopters) have a noticeable effect on times?

If you use light wood (1/16" square balsa), I doubt it would amount to much more than a gram or two (including glue). Hence, given the fact that most of the devices I've seen are around 20-30 grams, I don't think it would have a significant impact (if you are asking as to whether it lowers the times). In regards to how it may increase the time: that depends on the design, size, shape, and weight of the blades.

I, too, would like to know about that. I have rarely seen ribs on egg drop devices, so what would be the purpose for using them when they are?

I personally use them to make curved blades (blades that are in three dimensions rather than two). However, I'm sure that there are better, more creative ways to utilize them.

[ckssv07]

Do ribs on the rotors (like helicopters) have a noticeable effect on times?

They probably would but I believe that it would be counted as a parachute, because of the curve.