Bottle Rocket B

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kendreaditya
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Re: Bottle Rocket B

Postby kendreaditya » March 7th, 2017, 4:54 pm

Zioly wrote:
kendreaditya wrote:Last years highest times were 50 seconds. How in the world did they get that! Some people are getting 20 seconds, how?


I'm assuming you mean how did people get 20 seconds per rocket last year? If not, correct me, and also if what you meant is that there are people achieving 20+ seconds this year... HOW? But to answer your assumed question, the nationals winning time was 20+ seconds. I believe the 6th place rockets got ~15 seconds per rocket... how do they achieve these remarkable times? Lots and lots of testing! :)

EDIT: @sciolyohio and kendreaditya and anyone who attended WSU invitational, how were the averages only 3-5 seconds!? Those times seem absurdly low. Was it something to do with the launcher, weather, etc?


I didn't go to WSU, my school Eagle View MS, went Rustin and Little Tiger. Rustin's highest times were a total of 18 seconds and Little Tiger was 19 seconds. However, I am achieving 20 seconds, by my egg is killing me (it breaks sometimes on pavement).

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Re: Bottle Rocket B

Postby Zioly » March 7th, 2017, 5:25 pm

kendreaditya wrote:
Zioly wrote:
kendreaditya wrote:Last years highest times were 50 seconds. How in the world did they get that! Some people are getting 20 seconds, how?


I'm assuming you mean how did people get 20 seconds per rocket last year? If not, correct me, and also if what you meant is that there are people achieving 20+ seconds this year... HOW? But to answer your assumed question, the nationals winning time was 20+ seconds. I believe the 6th place rockets got ~15 seconds per rocket... how do they achieve these remarkable times? Lots and lots of testing! :)

EDIT: @sciolyohio and kendreaditya and anyone who attended WSU invitational, how were the averages only 3-5 seconds!? Those times seem absurdly low. Was it something to do with the launcher, weather, etc?


I didn't go to WSU, my school Eagle View MS, went Rustin and Little Tiger. Rustin's highest times were a total of 18 seconds and Little Tiger was 19 seconds. However, I am achieving 20 seconds, by my egg is killing me (it breaks sometimes on pavement).


Yeah, I'm getting 12/13 seconds consistently with my own launcher at 60 psi but at competition the most I've gotten is ~9 seconds. It's probably because I'm not using real eggs for testing though, so I'm making sure to do that for the future.

EDIT: 12/13 each
2017 Nats Div. B
Bottle Rockets: 5th
Ecology: 9th
Hovercraft: 14th
Scrambler: 29th (with a failed run too ;))


Inglemoor High School 2018 Div. C
Mousetrap Vehicle
Hovercraft
Ecology
Experimental Design (or other inquiry :P)

...Yes, my profile picture is G2 apEX at the PGL Major Qual. :lol:

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Re: Bottle Rocket B

Postby kendreaditya » March 8th, 2017, 3:59 pm

Zioly wrote:
kendreaditya wrote:
Zioly wrote:
I'm assuming you mean how did people get 20 seconds per rocket last year? If not, correct me, and also if what you meant is that there are people achieving 20+ seconds this year... HOW? But to answer your assumed question, the nationals winning time was 20+ seconds. I believe the 6th place rockets got ~15 seconds per rocket... how do they achieve these remarkable times? Lots and lots of testing! :)

EDIT: @sciolyohio and kendreaditya and anyone who attended WSU invitational, how were the averages only 3-5 seconds!? Those times seem absurdly low. Was it something to do with the launcher, weather, etc?


I didn't go to WSU, my school Eagle View MS, went Rustin and Little Tiger. Rustin's highest times were a total of 18 seconds and Little Tiger was 19 seconds. However, I am achieving 20 seconds, by my egg is killing me (it breaks sometimes on pavement).


Yeah, I'm getting 12/13 seconds consistently with my own launcher at 60 psi but at competition the most I've gotten is ~9 seconds. It's probably because I'm not using real eggs for testing though, so I'm making sure to do that for the future.

EDIT: 12/13 each


In order to get accurate tests i fill an ester egg with clay to make the weight around 50 grams.

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Re: Bottle Rocket B

Postby Fanglin » March 9th, 2017, 7:32 pm

kendreaditya wrote:
Zioly wrote:
kendreaditya wrote:
I didn't go to WSU, my school Eagle View MS, went Rustin and Little Tiger. Rustin's highest times were a total of 18 seconds and Little Tiger was 19 seconds. However, I am achieving 20 seconds, by my egg is killing me (it breaks sometimes on pavement).


Yeah, I'm getting 12/13 seconds consistently with my own launcher at 60 psi but at competition the most I've gotten is ~9 seconds. It's probably because I'm not using real eggs for testing though, so I'm making sure to do that for the future.

EDIT: 12/13 each


In order to get accurate tests i fill an ester egg with clay to make the weight around 50 grams.
Use hardboiled eggs as a weight. Or, when we had a shortage, we would whittle down potatoes to the right weight.
Problems are better pursued with General Electric GE90-115 engines.

2016 Nats:
Road Scholar:4th 8-)
Bottle Rockets: 9th
Meteorology: 11th
Gliders: 21st

(other events: Green Gen, Crime Busters, Helicopters, Hovercraft, Air trajectory)

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Re: Bottle Rocket B

Postby InDistress » March 20th, 2017, 3:49 pm

How do you cut carbon fiber??
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Re: Bottle Rocket B

Postby freed2003 » March 20th, 2017, 5:55 pm

Try using wire cutters, or you could lay i out flat and use a x-acto knife
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Re: Bottle Rocket B

Postby Zioly » April 5th, 2017, 9:39 pm

I'm having some trouble getting my nosecone aligned straight with my pressure vessel. At the moment, I've tried to make it parallel with walls through measurements and through guess-and-check, but all to no avail. It bugs me, even though it doesn't seem to have a huge impact on flight times. Anyways, what're your solutions/ideas to get the nosecone aligned with the bottle?
2017 Nats Div. B
Bottle Rockets: 5th
Ecology: 9th
Hovercraft: 14th
Scrambler: 29th (with a failed run too ;))


Inglemoor High School 2018 Div. C
Mousetrap Vehicle
Hovercraft
Ecology
Experimental Design (or other inquiry :P)

...Yes, my profile picture is G2 apEX at the PGL Major Qual. :lol:

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Re: Bottle Rocket B

Postby kendreaditya » April 19th, 2017, 3:20 pm

Zioly wrote:I'm having some trouble getting my nosecone aligned straight with my pressure vessel. At the moment, I've tried to make it parallel with walls through measurements and through guess-and-check, but all to no avail. It bugs me, even though it doesn't seem to have a huge impact on flight times. Anyways, what're your solutions/ideas to get the nosecone aligned with the bottle?


It depends what type of nosecone you are using. For the t8 tubes what I did in previous years was insert a bottle cap into the tube an glue it in there. As a result, you would be able to screw on the tube to a bottle. The other cone nosecone is a little different so all I do is "eye" the rocket from a long distance.

edit: P.S getting the nosecone aligned straight with the pressure vessel is very important due to the direct effect it has on the height of your rocket.
Last edited by kendreaditya on April 19th, 2017, 3:25 pm, edited 1 time in total.

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Re: Bottle Rocket B

Postby kendreaditya » April 19th, 2017, 3:23 pm

Does anyone have any ideas on how to fix the curve of the fin (its cause by glue)?

Image

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Re: Bottle Rocket B

Postby Fanglin » April 20th, 2017, 11:09 am

kendreaditya wrote:Does anyone have any ideas on how to fix the curve of the fin (its cause by glue)?

Image
I don't see why you should be even using glue. You arn't allowed to use
glue directly on the bottle. If I were you, I would immediatly switch to packaging tape for you're entire rocket.
Problems are better pursued with General Electric GE90-115 engines.

2016 Nats:
Road Scholar:4th 8-)
Bottle Rockets: 9th
Meteorology: 11th
Gliders: 21st

(other events: Green Gen, Crime Busters, Helicopters, Hovercraft, Air trajectory)

Former Cheesehead

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kendreaditya
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Re: Bottle Rocket B

Postby kendreaditya » April 20th, 2017, 12:18 pm

Fanglin wrote:
kendreaditya wrote:Does anyone have any ideas on how to fix the curve of the fin (its cause by glue)?

Image
I don't see why you should be even using glue. You arn't allowed to use
glue directly on the bottle. If I were you, I would immediatly switch to packaging tape for you're entire rocket.


I am using glue only in the fin, that is allowed according to the rules. I am wondering how to straighten the top of the fin shown in the photo.

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Re: Bottle Rocket B

Postby Fanglin » April 21st, 2017, 4:21 pm

kendreaditya wrote:
Fanglin wrote:
kendreaditya wrote:Does anyone have any ideas on how to fix the curve of the fin (its cause by glue)?

Image
I don't see why you should be even using glue. You arn't allowed to use
glue directly on the bottle. If I were you, I would immediatly switch to packaging tape for you're entire rocket.


I am using glue only in the fin, that is allowed according to the rules. I am wondering how to straighten the top of the fin shown in the photo.
Oh, there's a photo? I don't see one. See if you can re-upload one.
Problems are better pursued with General Electric GE90-115 engines.

2016 Nats:
Road Scholar:4th 8-)
Bottle Rockets: 9th
Meteorology: 11th
Gliders: 21st

(other events: Green Gen, Crime Busters, Helicopters, Hovercraft, Air trajectory)

Former Cheesehead

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Re: Bottle Rocket B

Postby Fanglin » April 21st, 2017, 4:22 pm

Never mind, I see it now
Problems are better pursued with General Electric GE90-115 engines.

2016 Nats:
Road Scholar:4th 8-)
Bottle Rockets: 9th
Meteorology: 11th
Gliders: 21st

(other events: Green Gen, Crime Busters, Helicopters, Hovercraft, Air trajectory)

Former Cheesehead

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Re: Bottle Rocket B

Postby Fanglin » April 21st, 2017, 4:24 pm

Assuming that's the leading edge, I predict that the type of paper you are using is too flimsy for the role. I think the best strategy for fixing this, is to replace the leading edge with something more rigid. My suggestion is a parallelogram of Corrugated plastic, but other materials may work.
Problems are better pursued with General Electric GE90-115 engines.

2016 Nats:
Road Scholar:4th 8-)
Bottle Rockets: 9th
Meteorology: 11th
Gliders: 21st

(other events: Green Gen, Crime Busters, Helicopters, Hovercraft, Air trajectory)

Former Cheesehead

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Re: Bottle Rocket B

Postby NeBH » April 28th, 2017, 10:55 am

Hi!

This is my first year going to Nationals, so I have a few questions;

I understand that the rules for size parameters are followed very strictly at Nationals, but I was wondering, what about the "The bottle can't have any scratches on it" rule? To put that another way, how deep/big can a scratch/scuff be until you get DQ'ed?

Also, do you have to mark which label came from which rocket? I'm assuming no (based on the rules), but better safe then sorry!

And finally, I've been using duct tape to attach the fins(I used balsa at States, but I'm going to switch to foam board) because it's pretty strong, but is it too heavy?
Should I be using packing tape instead? What have you guys found works the best?

Thanks!

-NeBH

P.S.
I'm from Idaho, and the rules are...
Well, let's just say...
They're not followed as strictly as they could be...
¯\_(ツ)_/¯
"We'll know what we're doing by the time we're done!"

Me, to the 2017 Nat. Scrambler ES:
About my launcher:

"It reminds me of the Millenium Falcon; it's a big pain in the rear, but it kind of works!"


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