Air Trajectory B/C

User avatar
bernard
Administrator
Administrator
Posts: 1964
Joined: January 5th, 2014, 3:12 pm
Division: Grad
State: WA
Location: Seattle, WA
Contact:

Re: Air Trajectory B/C

Postby bernard » March 6th, 2016, 8:48 am

AirTrejectors wrote:Is a trebuchet allowed in air trajectory?

Yes if the gravitational potential energy is converted to air pressure/movement to launch a projectile. A typical physics class trebuchet that doesn't use air pressure will not satisfy this requirement.
"One of the ways that I believe people express their appreciation to the rest of humanity is to make something wonderful and put it out there."

AirTrejectors
Member
Member
Posts: 5
Joined: March 6th, 2016, 8:00 am
State: -

Re: Air Trajectory B/C

Postby AirTrejectors » March 6th, 2016, 9:12 am

bernard wrote:
AirTrejectors wrote:Is a trebuchet allowed in air trajectory?

Yes if the gravitational potential energy is converted to air pressure/movement to launch a projectile. A typical physics class trebuchet that doesn't use air pressure will not satisfy this requirement.

How would a trebuchet covert potential energy into air pressure? If it's triggered using air pressure does that count as being incorporated?

User avatar
bernard
Administrator
Administrator
Posts: 1964
Joined: January 5th, 2014, 3:12 pm
Division: Grad
State: WA
Location: Seattle, WA
Contact:

Re: Air Trajectory B/C

Postby bernard » March 6th, 2016, 9:35 am

AirTrejectors wrote:
bernard wrote:
AirTrejectors wrote:Is a trebuchet allowed in air trajectory?

Yes if the gravitational potential energy is converted to air pressure/movement to launch a projectile. A typical physics class trebuchet that doesn't use air pressure will not satisfy this requirement.

How would a trebuchet covert potential energy into air pressure? If it's triggered using air pressure does that count as being incorporated?

Energy used to launch the projectile must come from air pressure, which must be initially supplied by the falling mass. A falling mass generating air pressure that causes another mass to fall and launch the projectile would not use air pressure to launch the projectile--the energy comes directly from the gravitational energy of the falling mass. Also your device should not start with any air stored at non-ambient air pressure (e.g. you can't use a pump to increase pressure inside a vessel before launches).

As always, opinions on this site are not official. Official opinions are only available at sonic.org.
"One of the ways that I believe people express their appreciation to the rest of humanity is to make something wonderful and put it out there."

User avatar
Bazinga+
Exalted Member
Exalted Member
Posts: 383
Joined: March 8th, 2014, 7:10 am
Division: C
State: NY
Location: Ward Melville HD

Re: Air Trajectory B/C

Postby Bazinga+ » March 6th, 2016, 10:47 am

AirTrejectors wrote:
bernard wrote:
AirTrejectors wrote:Is a trebuchet allowed in air trajectory?

Yes if the gravitational potential energy is converted to air pressure/movement to launch a projectile. A typical physics class trebuchet that doesn't use air pressure will not satisfy this requirement.

How would a trebuchet covert potential energy into air pressure? If it's triggered using air pressure does that count as being incorporated?

If you have a weight fall on something that causes air flow and that air flow flings the trebuchet then that would be fine.
Innovation =/= success

papesthemonkey
Member
Member
Posts: 1
Joined: March 6th, 2016, 12:59 pm
State: -

Re: Air Trajectory B/C

Postby papesthemonkey » March 6th, 2016, 1:03 pm

hey does anyone know how to signup online for a time slot for air trajectory?

User avatar
bernard
Administrator
Administrator
Posts: 1964
Joined: January 5th, 2014, 3:12 pm
Division: Grad
State: WA
Location: Seattle, WA
Contact:

Re: Air Trajectory B/C

Postby bernard » March 6th, 2016, 1:31 pm

papesthemonkey wrote:hey does anyone know how to signup online for a time slot for air trajectory?

This should be done following your tournament's sign-up procedures, which vary from tournament to tournament. Email the tournament director to check.
"One of the ways that I believe people express their appreciation to the rest of humanity is to make something wonderful and put it out there."

User avatar
watermydoing14
Member
Member
Posts: 108
Joined: July 25th, 2013, 8:53 pm
Division: C
State: WA
Location: Interlake
Contact:

Re: Air Trajectory B/C

Postby watermydoing14 » March 16th, 2016, 9:15 am

Bazinga+ wrote:
Eggo wrote:
kaylie2000 wrote:
What exactly do you mean by a pump? I've tried to build a sort of air pressure chamber but it did not work out.


Some good pumps I have seen are stomp rocket pumps, either circular, or rectangular.

http://www.amazon.com/The-Original-Stomp-Rocket-4-Rocket/dp/B0006O8Q7Y

I don't recommend using stomp rocket pumps since they have the exact same problems as regular bottles. Try hand pumps or foot pumps which are very consistent and don't wear out.


Our team is experimenting with an ambu bag - one of our member's dad is a doctor and he lent us one for free, but you could probably get them for ~$20 online
2013~Designer Genes~Disease Detectives~Forensics~Remote Sensing
2014~Anatomy~Experimental Design~Mission Possible
2015~Anatomy~Cell Biology~Experimental Design~Mission Possible
2016~Air Trajectory~Anatomy~Cell Biology~Experimental Design~Protein Modeling~Robot Arm~Wright Stuff
Interlake High School
GO SAINTS!

AirTrejectors
Member
Member
Posts: 5
Joined: March 6th, 2016, 8:00 am
State: -

Re: Air Trajectory B/C

Postby AirTrejectors » March 25th, 2016, 12:43 pm

Where does the distance to shoot start from? Do you have to align the front of your device to a line? Also, is a bucket shot using a physical bucket that has a height to it?

maxxxxx
Member
Member
Posts: 284
Joined: November 30th, 2015, 8:11 am
Division: Grad
State: PA
Location: CA

Re: Air Trajectory B/C

Postby maxxxxx » March 25th, 2016, 1:19 pm

AirTrejectors wrote:Where does the distance to shoot start from? Do you have to align the front of your device to a line? Also, is a bucket shot using a physical bucket that has a height to it?


As long as the device fits within the box I think it does not have to be aligned with the front line. The bucket shot is a literal bucket with height.
Lower Merion Class Of 2017

AirTrejectors
Member
Member
Posts: 5
Joined: March 6th, 2016, 8:00 am
State: -

Re: Air Trajectory B/C

Postby AirTrejectors » March 25th, 2016, 2:15 pm

maxxxxx wrote:
AirTrejectors wrote:Where does the distance to shoot start from? Do you have to align the front of your device to a line? Also, is a bucket shot using a physical bucket that has a height to it?


As long as the device fits within the box I think it does not have to be aligned with the front line. The bucket shot is a literal bucket with height.

~how high is the bucket normally? And does the projectile have to be a ball? I'm currently using a medicine bottle.

reed303
Member
Member
Posts: 69
Joined: October 17th, 2014, 2:44 pm
State: -

Re: Air Trajectory B/C

Postby reed303 » March 25th, 2016, 2:29 pm

AirTrejectors wrote:
maxxxxx wrote:
AirTrejectors wrote:Where does the distance to shoot start from? Do you have to align the front of your device to a line? Also, is a bucket shot using a physical bucket that has a height to it?


As long as the device fits within the box I think it does not have to be aligned with the front line. The bucket shot is a literal bucket with height.

~how high is the bucket normally? And does the projectile have to be a ball? I'm currently using a medicine bottle.


Plan on a 12"-18" high bucket, 1-5 gallon. Like a standard "Home Depot" 5 gallon bucket.
And the ball MUST be a ball. 1 of the 4 specific balls in the rules. Ping Pong, tennis, racquet, or practice golf (foam or plastic).
Targets are measured from the front line of the 1 meter square "launch area", which the device must be inside of in its "ready-to-launch" position. But not necessarily "on" the lines. It is your decision on how to align the device (inside the launch area) to hit a given target.
Div B Asst Coach 2012-2018

chalker
Member
Member
Posts: 2086
Joined: January 9th, 2009, 7:30 pm
Division: Grad
State: OH

Re: Air Trajectory B/C

Postby chalker » March 25th, 2016, 3:19 pm

AirTrejectors wrote:
maxxxxx wrote:
AirTrejectors wrote:Where does the distance to shoot start from? Do you have to align the front of your device to a line? Also, is a bucket shot using a physical bucket that has a height to it?


As long as the device fits within the box I think it does not have to be aligned with the front line. The bucket shot is a literal bucket with height.

~how high is the bucket normally? And does the projectile have to be a ball? I'm currently using a medicine bottle.



Based upon your questions, it appears you haven't reviewed a copy of the rules. You REALLY need to study them closely. Your coach should be able to provide you with a copy. There are a LOT of details you need to be aware of that could cause you to be DQ'd, and the one about the choice of projectile is an obvious one you should have known immediately before even thinking about building a device.

Student Alumni
National Event Supervisor
National Physical Sciences Rules Committee Chair

AirTrejectors
Member
Member
Posts: 5
Joined: March 6th, 2016, 8:00 am
State: -

Re: Air Trajectory B/C

Postby AirTrejectors » March 25th, 2016, 7:44 pm

If the ball is shooting too far, can I put another projectile in it with the ball so that the air moves the first projectile into hitting the ball? Would I be disqualified if the first projectile comes out?

GoldenKnight1
Coach
Coach
Posts: 197
Joined: May 2nd, 2009, 5:02 pm
Division: Grad
State: PA

Re: Air Trajectory B/C

Postby GoldenKnight1 » March 26th, 2016, 4:39 am

AirTrejectors wrote:If the ball is shooting too far, can I put another projectile in it with the ball so that the air moves the first projectile into hitting the ball? Would I be disqualified if the first projectile comes out?


I think you would have an issue with 5.d. since with some judges (myself included) believing that this "first projectile" is part of your device that cannot leave the 1m x 1m launch area. You would not be disqualified though as it would only result in a 100 point penalty per shot that this happened during. Now if you had a way to keep it from leaving he launch area that would be another story.

reed303
Member
Member
Posts: 69
Joined: October 17th, 2014, 2:44 pm
State: -

Re: Air Trajectory B/C

Postby reed303 » March 26th, 2016, 9:07 am

AirTrejectors wrote:If the ball is shooting too far, can I put another projectile in it with the ball so that the air moves the first projectile into hitting the ball? Would I be disqualified if the first projectile comes out?


The common approach to this is raise the angle of the launch tube and/or reduce the weight of the mass.
Div B Asst Coach 2012-2018


Return to “Air Trajectory B/C”

Who is online

Users browsing this forum: No registered users and 1 guest