Nerf gun
From DDL Wiki
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Step 8: User loads darts onto the gun's nozzle and the dart holders.<br /> | Step 8: User loads darts onto the gun's nozzle and the dart holders.<br /> | ||
- | NOTE: The Big Bad Bow also has an initial assembly procedure for the consumer to perform prior to use. That procedure is not described | + | NOTE: The Big Bad Bow also has an initial assembly procedure for the consumer to perform prior to use. That procedure is not described here is not described here. |
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[http://picasaweb.google.com/lh/photo/SkN-EINJEeUi5k_7To548Q?feat=directlink| Rapid Fire 20 Video] | [http://picasaweb.google.com/lh/photo/SkN-EINJEeUi5k_7To548Q?feat=directlink| Rapid Fire 20 Video] | ||
- | Step 1: User picks up the fully loaded blaster by the yellow handle. | + | Step 1: User picks up the fully loaded blaster by the yellow handle.<br /> |
- | Step 2: User pumps the orange handle 25 to 30 times to fully prime the blaster. | + | Step 2: User pumps the orange handle 25 to 30 times to fully prime the blaster.<br /> |
- | Step 3: User chooses single shot mode or rapid fire mode with the orange dial located on the side of the blaster. | + | Step 3: User chooses single shot mode or rapid fire mode with the orange dial located on the side of the blaster.<br /> |
- | Step 4: User points the blaster in general direction of target(s). | + | Step 4: User points the blaster in general direction of target(s).<br /> |
- | Step 5: User pulls the trigger to fire single darts or a stream of darts. | + | Step 5: User pulls the trigger to fire single darts or a stream of darts.<br /> |
- | Step 6: User retrieves darts (20 per clip). | + | Step 6: User retrieves darts (20 per clip). <br /> |
- | Step 7: User loads the darts into the barrels of the gun. | + | Step 7: User loads the darts into the barrels of the gun. <br /> |
==== Buzz Saw ==== | ==== Buzz Saw ==== | ||
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[http://picasaweb.google.com/lh/photo/Smdyb7PBokXAZO3CrC2b7Q?feat=directlink| Buzz Saw Video] | [http://picasaweb.google.com/lh/photo/Smdyb7PBokXAZO3CrC2b7Q?feat=directlink| Buzz Saw Video] | ||
- | Step 1: User picks up the fully loaded blaster by the green-gripped handle. | + | Step 1: User picks up the fully loaded blaster by the green-gripped handle.<br /> |
- | Step 2: User sturdily holds the green-gripped handle and pulls back repeatedly on the light blue handle until the desired amount of angular momentum is attained in the flywheel. This is an intuitive process for the majority of users. High angular speeds are indicated with a high pitch whining spooling noise from the flywheel and low angular speeds are indicated with a low pitch spooling noise. | + | Step 2: User sturdily holds the green-gripped handle and pulls back repeatedly on the light blue handle until the desired amount of angular momentum is attained in the flywheel. This is an intuitive process for the majority of users. High angular speeds are indicated with a high pitch whining spooling noise from the flywheel and low angular speeds are indicated with a low pitch spooling noise. <br /> |
- | Step 3: User quickly aims at target(s) | + | Step 3: User quickly aims at target(s)<br /> |
- | Step 4: User fires as many balls as desired, repeating steps 2 and 3 as necessary. | + | Step 4: User fires as many balls as desired, repeating steps 2 and 3 as necessary. <br /> |
- | Step 5: User retrieves balls. | + | Step 5: User retrieves balls.<br /> |
- | Step 6: User loads three balls into the hopper. | + | Step 6: User loads three balls into the hopper.<br /> |
=== User Study === | === User Study === |
Revision as of 22:07, 19 September 2009
Contents |
Executive Summary
Product Study
Functionality
Video Link of all Nerf Blasters Firing at Once
Big Bad Bow
Big Bad Bow Video
Step 1: User picks up the fully loaded blaster by one of the two handles.
Step 1: User picks up the fully loaded blaster to hold by both handles.
Step 2: User brings unused hand to hold the unused handle.
Step 3: Blaster is held across the chest orienting the gun to shoot to the left or to the right.
Step 4: User pulls back the rear-most handle from the rest of the gun till a click is heard or felt.
Step 5: User aims at a target through the scopes.
Step 2: User aims at a target through the scopes.
Step 3: User pulls back the rear-most handle from the rest of the gun till a click is heard or felt.
Step 4: User pulls the trigger which fires the dart and unlocks the bolt.
Step 5: User retracts rearmost handle's sub-assembly.
Step 6: User loads second and third darts from the dart holders subsequently, and then follows steps 2 through 5 to fire darts.
Step 7: User retrieves the darts.
Step 8: User loads darts onto the gun's nozzle and the dart holders.
NOTE: The Big Bad Bow also has an initial assembly procedure for the consumer to perform prior to use. That procedure is not described here is not described here.
Rapid Fire 20
Step 1: User picks up the fully loaded blaster by the yellow handle.
Step 2: User pumps the orange handle 25 to 30 times to fully prime the blaster.
Step 3: User chooses single shot mode or rapid fire mode with the orange dial located on the side of the blaster.
Step 4: User points the blaster in general direction of target(s).
Step 5: User pulls the trigger to fire single darts or a stream of darts.
Step 6: User retrieves darts (20 per clip).
Step 7: User loads the darts into the barrels of the gun.
Buzz Saw
Step 1: User picks up the fully loaded blaster by the green-gripped handle.
Step 2: User sturdily holds the green-gripped handle and pulls back repeatedly on the light blue handle until the desired amount of angular momentum is attained in the flywheel. This is an intuitive process for the majority of users. High angular speeds are indicated with a high pitch whining spooling noise from the flywheel and low angular speeds are indicated with a low pitch spooling noise.
Step 3: User quickly aims at target(s)
Step 4: User fires as many balls as desired, repeating steps 2 and 3 as necessary.
Step 5: User retrieves balls.
Step 6: User loads three balls into the hopper.
User Study
Users were picked at random to use and comment on the Nerf blasters in a public setting in the middle of the Carnegie Mellon Campus. Observations of the users were made and comments were recorded. The following is a compilation of all the observations and comments made about each product during the study.
More details and recordings from the campus user study can be found at Nerf_gun_userstudy Wiki page.
Big Bad Bow
General Feedback: People tended to initially think the gun was very appealing, but after using it were often disappointed in its performance.
User responses:
(1) Sight was useful for lateral accuracy, not for vertical positioning
(2)Large learning curve for an accurate shot
(3)Not as exhilarating as other Nerf weapons
(4)Ammo breaks easily
(5)Shooting mechanism is complicated, Functionality of design is not apparent many misfires trying to get ready
(5)Operation is not immediately apparent, unclear on how to hold it
(6)Short Range
- Too big
- Fulfills a classic "image" (((((?)))))
- Can't de-cock the mechanism without firing
- Not immediately apparent how to cock it
*Confusing design, too much is cosmetic,
- Aesthetics and functionality do not align
Rapid Fire 20
General feedback: This weapon was praised as the most enjoyable to use, but there were frequent complaints people had about getting the gun ready to fire.
User responses:
- Takes forever to pump and load
- Good for crowds
- Is the most fun: most people would want to buy this gun after playing with all three
- Not very comfortable
- No pressure gauge, when should pumping stop?
- Pumping force is too great
- Tube behind grip is annoying
- Hard to aim, there is no sight
- Pump feels flimsy
- More satisfying to fire than other nerf blasters
- More "feedback" feel when firing
- Tedious to pick up all the fired ammo
- "Single Fire" mode does not function properly (fires multiple darts still)
- Wasn't apparent at first that it needed to be pumped to fire
- Not all of the darts fire; some get stuck.
Buzz Saw
General feedback: People seemed to like the shooting mechanism for this gun, but generally it didn't seem as fun to play with.
User responses:
- Very accurate
- Jammed frequently, and the top ball often did not fall into the shooting mechanism from the loading station
- Makes an annoying sound
- Makes an awesome sound
- Is difficult or impossible to shoot at an upwards angle
- Difficult to remember to stop pumping before firing, making shots inaccurate
- Limited by the user's strength
- Seems the easiest to improve
- More obvious function
- Short Range if not primed well
Performance Studies
In order to compare the different guns in terms of performance, we set up experiments to test how the three guns compared with respect to distance and accuracy.
Distance Study
Set Up: Guns were fired indoors from a horizontal orientation from 33.5" above the ground, and the position where the ammo first hit the ground was measured. The gun was held very steady when being shot so that no extra forward momentum was imparted on the projectile. Tests were performed indoors, so there was no wind or other disturbances.
Big Bad Bow: 19.0, 19.2, 18.10, 18.10, 17.10, 17.2, 19.0, 19.1, & 18.7 (Average 18' 7")
Rapid Fire 20: 18' - 22' Spread
Buzz Saw: 26.10, 29.4, 29.5, 30.1, 32.2, 32.9, 29.3, 30.4, & 31.4 (Average 30' 2")
Pictures
Videos
Accuracy Study
Set Up: 3 people without previous nerf gun experience were selected at random to participate in the study. Each person was instructed to stand 17' away from a target and fire with each separate nerf gun at the target. Pictures were taken in order to discern their accuracy. Then one of our group members, after practicing with all three guns, did the same accuracy test and the results were recorded as well. By testing both groups, we will be able to figure out how easy each gun is to aim for a beginner, and for somebody with more experience.
Videos
Results!!!
Product Dissection
Mechanical Function
Bill of Materials
Big Bad Bow
Preliminary Analysis
Stakeholders
Some of the main stakeholders in nerf guns are the children who play with them, the parents who buy them and supervise their use, and the retailers that stock them.
Children: The children in this case are the end users, the one who actually use the product. They are also the ones who probably nag their parents into buying them, so it's both important that the guns appeal to them before they are bought, and they are enjoyable. In particular, children will enjoy a gun if it is "fun" to play with (generally involves power, ease of use, & physical appeal)
Parents: Even though the children play with the toy, the parents have a large stake in it as well. If the gun ever doesn't work, the parent will of course have to deal with returning the gun, or buying a replacement (or replacement ammo). Also, if a child is ever injured while playing with the toy, the parent has to help heal the injured child, and probably reprimand another child. Parents will like most the gun that is safe to use (very little chance of injury) and reliable (no need for extra trips to the toy store).
Retailer: The retailer has the smallest stake in terms of day to day use, but their profit off the item is what determines if it stays available to purchase. The retailer will only like items that are popular (sell quickly, attract attention), have no customer support issues (no returns), and are easy to keep in shop (not breakable, easily storeable).