Egg-O-Naut C

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Re: Egg-O-Naut C

Postby starpug » May 9th, 2010, 8:45 pm

cypressfalls Robert wrote:
starpug wrote:
cypressfalls Robert wrote:with our design we put, 535 ml and 800ml of water and it went up to about 150 feet

The question is how did you keep the nose cone from fusing onto the bottle when that happened :P

we have stoppers, i'll post a pic, the bottom half shoots up and when it is out of juice the top keeps going forward and at the top it all seperates, it has gotten3 to 4 minutes consistantly.

You're the one with the 15 foot nose cones right?
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Re: Egg-O-Naut C

Postby cypressfalls Robert » May 9th, 2010, 8:48 pm

lol yea, but we changed the design to a totally different one, and works a little better, ~30 seconds

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Re: Egg-O-Naut C

Postby starpug » May 9th, 2010, 8:53 pm

cypressfalls Robert wrote:lol yea, but we changed the design to a totally different one, and works a little better, ~30 seconds

With shorter nose cones? You just said you were getting 4 minutes?
Get your facts first, then you can distort them as you please. - Mark Twain

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Re: Egg-O-Naut C

Postby cypressfalls Robert » May 9th, 2010, 9:18 pm

yea, just wait for the pic

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Re: Egg-O-Naut C

Postby rocketman1555 » May 10th, 2010, 2:52 pm

midnightroxy13 wrote:Yeah! that would be great if you told me about stability and how to stabilize it! would you put the fins under the cone??


The basics of stability are that you have to have the Center of Mass (also called Center of Gravity) above the Center of Pressure on the rocket. 1 diameter is usually recommended on model rockets. The simplest way to determine center of mass is to load your rocket with both the egg and water, and then suspend it from a string, and find where it is balanced on the string. To find Center of Pressure you can just make a flat cardboard cutout of your rocket and balance that, which can probably be done on a finger. You then mark the Center of Pressure on the bottle at the same location it is on the cardboard cutout.

If the center of mass is behind the center of pressure then your rocket won't be stable, and if they are relatively close together then it is only marginally stable. To increase stability you have a few options. You can make the rocket longer, make bigger fins, or add more weight to the front. I prefer to make the rocket a little longer, because about one extra bottle length really helps.

I'll try to post some pictures of how to do this in the next few days.
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Re: Egg-O-Naut C

Postby cypressfalls Robert » May 12th, 2010, 3:03 pm

cypressfalls Robert wrote:
starpug wrote:
cypressfalls Robert wrote:with our design we put, 535 ml and 800ml of water and it went up to about 150 feet

The question is how did you keep the nose cone from fusing onto the bottle when that happened :P

we have stoppers, i'll post a pic, the bottom half shoots up and when it is out of juice the top keeps going forward and at the top it all seperates, it has gotten3 to 4 minutes consistantly.

here's a rough paint sketch:this is without fins on the drawing, not on the real thing!
Image

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Re: Egg-O-Naut C

Postby Cheerwine » May 17th, 2010, 4:27 pm

How seriously do they take the pointed nosecone rule? I don't think my pointed nosecone is sharp enough to hurt anyone, but I don't want to get dq'ed either.

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Re: Egg-O-Naut C

Postby midnightroxy13 » May 17th, 2010, 4:38 pm

At my state they made people cut off the tip, but i don't know how strict they are at nationals because i've never been

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Re: Egg-O-Naut C

Postby starpug » May 17th, 2010, 4:39 pm

Cheerwine wrote:How seriously do they take the pointed nosecone rule? I don't think my pointed nosecone is sharp enough to hurt anyone, but I don't want to get dq'ed either.

Read the clarifications on the nationals site, I would put a ping pong ball on it just to be safe
Get your facts first, then you can distort them as you please. - Mark Twain

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Re: Egg-O-Naut C

Postby kjhsscioly » May 17th, 2010, 7:19 pm

at the IL state competition, i had a rolled nosecone made from plastic, and it was pointed, though not extremely so, but the directors did not say anything about it. As long as you avoid metal tips, i don't think there will be an issue.

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Re: Egg-O-Naut C

Postby random_man » May 18th, 2010, 9:53 am

Hi, I was just wondering what times people were getting this year for rockets? I seem to be getting only around 30-40 seconds average.

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Re: Egg-O-Naut C

Postby starpug » May 18th, 2010, 10:54 am

random_man wrote:Hi, I was just wondering what times people were getting this year for rockets? I seem to be getting only around 30-40 seconds average.

That's about where I am :|
Get your facts first, then you can distort them as you please. - Mark Twain

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Re: Egg-O-Naut C

Postby rocketman1555 » May 18th, 2010, 7:03 pm

My highest was 35, but most were in the 20s.
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Re: Egg-O-Naut C

Postby packer-backer91 » May 19th, 2010, 7:48 pm

My schools regional time was 42seconds without the bonus [cold and rainy day too]. Then weather was very favorable for a select group of teams got some really good currents going at State. My school got 8th at State with a time of 2 minutes of flight time and went 1/4 of a mile away from launch zone the winner went much farther than that even, for Nat's depending on the weather I bet you can bet to see some multi minute times because of favorable air/wind conditions
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Re: Egg-O-Naut C

Postby cypressfalls Robert » May 21st, 2010, 5:27 am

At our state the best time was 5 minutes, so I predict the best at nationals should be between 3 to 5 minutes :D


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