Search found 187 matches

by hogger
February 21st, 2015, 3:08 pm
Forum: 2015 Build Events
Topic: Air Trajectory B/C
Replies: 573
Views: 104978

Re: Air Trajectory B/C

That is not very clear to me. The same material if put in a package that has the word plastic in it is legal and not if it does not. It is border on relying on some marketing department or who design the package for the material to be legal and not at all scientific, seems to me. Wouldn't no foam ba...
by hogger
February 21st, 2015, 2:51 pm
Forum: 2015 Build Events
Topic: Air Trajectory B/C
Replies: 573
Views: 104978

Re: Air Trajectory B/C

And yet many competitions and regionals are allowing foam balls, why? Because even in the clarifications, it is not entirely clear it is not allowed. The requirement that the word has to be on the package is ambiguous while the other item in the clarification seems to say that it might be allowed. I...
by hogger
February 21st, 2015, 9:27 am
Forum: 2015 Build Events
Topic: Air Trajectory B/C
Replies: 573
Views: 104978

Re: Air Trajectory B/C

In our state competition, there are simply wide range of students/coaches/parents that compete and it is not uncommon that many of them do not carefully follow the websites or forums such as this. I am not a coach of this event so I was not fully aware of the details, I just started helping out a fe...
by hogger
February 20th, 2015, 6:50 pm
Forum: 2015 Build Events
Topic: Air Trajectory B/C
Replies: 573
Views: 104978

Re: Air Trajectory B/C

Yes the foam balls would definitely be easier to work with and provide many advantages over the other types of balls. They are very light, not as light as ping-pong ball but much lighter than other types of balls, so it takes a lot less energy to move them. They have solid core with dimples so they ...
by hogger
February 20th, 2015, 4:32 am
Forum: 2015 Build Events
Topic: Air Trajectory B/C
Replies: 573
Views: 104978

Re: Air Trajectory B/C

People asked for hints regarding my elegantly simple solution to the problem of mismatched ball/pipe sizes. Here are two hints: 1. The French 2. Rocket Propelled Grenades (I am not, however, implying that using rocket propelled grenades or French people in your device is either legal or safe in com...
by hogger
February 20th, 2015, 3:57 am
Forum: Bridge Building B/C
Topic: Tool Safety
Replies: 12
Views: 2693

Re: Tool Safety

We use a little razor blade that cost maybe 10 cents a piece at Home Depot. It cuts much better than Xacto knife for us. Xacto knife tends to crush the balsa especially when the pieces are very light like contest grade balsa for Wright Stuff or flying events. When the blade gets dull, we just throw ...
by hogger
February 14th, 2015, 2:02 pm
Forum: 2015 Build Events
Topic: Air Trajectory B/C
Replies: 573
Views: 104978

Re: Air Trajectory B/C

You could line the inside of your barrel where the plastic practice golf ball rests with a single layer of craft foam and use tape to make it a good fit. Exactly. Excellent suggestion. You only have to line the inside around where the ball rest before takeoff. You get good initial push when pressur...
by hogger
February 13th, 2015, 10:07 pm
Forum: 2015 Build Events
Topic: Air Trajectory B/C
Replies: 573
Views: 104978

Re: Air Trajectory B/C

For anyone using a plastic practice golf ball as the ball to launch: what kind of tube are you putting the ball in? I've looked for PVC pipe, and while it holds a ping pong ball well, it is just too small for the practice golf ball (about 2mm too small on the ID). Any help? PVC pipe comes in many s...
by hogger
March 27th, 2014, 2:49 pm
Forum: 2014 Build Events
Topic: Boomilever B/C
Replies: 690
Views: 73594

Re: Boomilever B/C

> 1. We use silica gel in containers that should stay sealed- which is similar (probably not as effective as a hair dryer, but is simple and overall effective). You can blow dry the structure before putting it in the sealed box with lots of silica. In fact, blow dry the air in the box and the struct...
by hogger
March 27th, 2014, 2:30 pm
Forum: 2014 Build Events
Topic: Boomilever B/C
Replies: 690
Views: 73594

Re: Boomilever B/C

At our impound, you have to get in line to do the checking. You could easily wait 10 minutes or more until your turn. From experience, 10-15 minutes later, you could gain back 70-80% of the weight back especially in humid environment.

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