Bottle Rocket B

Locked
User avatar
Brucester
Member
Member
Posts: 43
Joined: February 16th, 2010, 9:38 pm
Division: B
State: PA
Location: I wish I was in God's country....Iowa
Has thanked: 0
Been thanked: 0

Re: Bottle Rocket B

Post by Brucester » March 22nd, 2011, 7:43 am

The rain seems to make my rocket's high lower than expected and descent faster. But when there's rain, there's usually wind, so the two balance each other out.

Brucester
Last edited by Brucester on March 23rd, 2011, 1:53 pm, edited 1 time in total.
2011 Nationals:
3rd - Bottle Rockets
7th - Storm the Castle
7th - Towers
22nd - Experimental Design

Flavorflav
Member
Member
Posts: 1376
Joined: February 5th, 2006, 7:06 am
Division: Grad
State: NY
Has thanked: 0
Been thanked: 1 time

Re: Bottle Rocket B

Post by Flavorflav » March 22nd, 2011, 9:59 am

Primate wrote:Winning time for the NY state competition (division c trial event) was 21.5 seconds.
The wind was a real factor, though. It cut our expected time in half.

User avatar
Brucester
Member
Member
Posts: 43
Joined: February 16th, 2010, 9:38 pm
Division: B
State: PA
Location: I wish I was in God's country....Iowa
Has thanked: 0
Been thanked: 0

Re: Bottle Rocket B

Post by Brucester » March 22nd, 2011, 11:15 am

My comment before was a joke, so don't attach random bags of cement :roll: .... Regardless, how are people preparing their rockets? I know for my team, we've been designing nice weather ones, waterproof ones, high-wind ones, and different combinations of those three types. We've been having best results with our nice weather ones, but has anyone come across different results? We just can't get a waterproof one to work like our others.

Thanks,
Brucester
2011 Nationals:
3rd - Bottle Rockets
7th - Storm the Castle
7th - Towers
22nd - Experimental Design

User avatar
rocketman 42
Member
Member
Posts: 2
Joined: March 22nd, 2011, 11:23 am
Division: B
State: PA
Has thanked: 0
Been thanked: 0

Re: Bottle Rocket B

Post by rocketman 42 » March 22nd, 2011, 11:49 am

Littleboy wrote:Today I got 25 seconds :D Hopefully I can do the same next week and that was not just a fluke. I think we finally figured it out.
littleboy, the wind at the tournament can really screw things up. for instance, i had a 18 second rocket that got 13 seconds at the competition.

User avatar
rocketman 42
Member
Member
Posts: 2
Joined: March 22nd, 2011, 11:23 am
Division: B
State: PA
Has thanked: 0
Been thanked: 0

Re: Bottle Rocket B

Post by rocketman 42 » March 22nd, 2011, 11:51 am

Platypus wrote:My highest time is 17 seconds with a backslider. Is this good enough to win/or get close to winning states?
Platypus, Dont count on it, i have seen some rockets with great times at the invitationals, up to 30 seconds or so.

User avatar
Brucester
Member
Member
Posts: 43
Joined: February 16th, 2010, 9:38 pm
Division: B
State: PA
Location: I wish I was in God's country....Iowa
Has thanked: 0
Been thanked: 0

Re: Bottle Rocket B

Post by Brucester » March 23rd, 2011, 1:51 pm

I haven't seen any rockets over 30 seconds at any of the 4 invitationals (Northmont, Magsig, Solon, West-Liberty) I was at. The best ones that I saw were around 25s. On the topic of the wind, it actually can help your rocket. If there's a medium breeze and your rocket's light enough, the breeze will give the rocket way more lift during the backslide causing it to fall slower. We launched a rocket at West-liberty that got 19 seconds in tests, but with VERY harsh winds and lots of rain our time went up to 23 seconds. It's about balancing the rocket correctly to be able to handle the wind. If there is a good balance of surface area on each side of the cg, the wind will simply push the rocket over, but keeping it perpendicular to the ground. If there is too much surface area on the bottom or top, the wind will push that side more because of more lift. This will throw off it's "ballistic trajectory" causing it to most likely rotate into a nosedive or an unstable backslide. My rocket at West-liberty drifted to the left about 100 yards, but it remained perpendicular to the ground throughout the flight and the wind worked as extra lift.
2011 Nationals:
3rd - Bottle Rockets
7th - Storm the Castle
7th - Towers
22nd - Experimental Design

Cheesy Pie
Member
Member
Posts: 594
Joined: January 29th, 2011, 4:34 pm
Division: Grad
State: MI
Has thanked: 0
Been thanked: 0

Re: Bottle Rocket B

Post by Cheesy Pie » March 23rd, 2011, 2:01 pm

During the tryouts, we launched @ 20 psi (I think), and most people got 2-3 seconds. But mine (which was shaped like a giant bullet) got 3.70 seconds (better than one of our rockets @ regionals)
100% of deaths are somehow caused by science.
Don't be a statistic.
Don't do science.

Naperville Central High School '17 :arrow: Michigan State University Physics '21
GO GREEN GO WHITE

User avatar
Brucester
Member
Member
Posts: 43
Joined: February 16th, 2010, 9:38 pm
Division: B
State: PA
Location: I wish I was in God's country....Iowa
Has thanked: 0
Been thanked: 0

Re: Bottle Rocket B

Post by Brucester » March 23rd, 2011, 2:06 pm

Why would you launch the rockets at 20psi? The rocket will show different characteristics at such a low pressure and it doesn't seem like much of a valid test. I'm just wondering out of curiosity because it would be nice to know a way to test the rockets at a low psi without risking destroying them if they don't work at 75psi.

Brucester
2011 Nationals:
3rd - Bottle Rockets
7th - Storm the Castle
7th - Towers
22nd - Experimental Design

Cheesy Pie
Member
Member
Posts: 594
Joined: January 29th, 2011, 4:34 pm
Division: Grad
State: MI
Has thanked: 0
Been thanked: 0

Re: Bottle Rocket B

Post by Cheesy Pie » March 23rd, 2011, 2:12 pm

It was the tryouts! We were using manual pressurizers!
100% of deaths are somehow caused by science.
Don't be a statistic.
Don't do science.

Naperville Central High School '17 :arrow: Michigan State University Physics '21
GO GREEN GO WHITE

User avatar
Littleboy
Member
Member
Posts: 373
Joined: March 14th, 2010, 4:53 pm
Division: C
State: MI
Location: Between the Earth's Core and Mars.
Has thanked: 0
Been thanked: 0

Re: Bottle Rocket B

Post by Littleboy » March 23rd, 2011, 2:28 pm

Well we just use a bike pump and never had a problem getting to 75 within a minute (except frequent leaks)

Locked

Return to “2011 Build Events”

Who is online

Users browsing this forum: No registered users and 3 guests