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by sciencecat42
April 10th, 2019, 9:34 pm
Forum: Boomilever B/C
Topic: Balsa Wood Grain
Replies: 7
Views: 451

Re: Balsa Wood Grain

Sorry I'm a bit confused about your post. Did you end up using C grain or A grain? And how much does the grain actually matter? I tried making a design with 1/4x1/8 balsa sticks today and it barely held any sand before the whole compression structure began to bow upwards. I did put the 1/4" en...
by sciencecat42
April 10th, 2019, 7:56 pm
Forum: Mousetrap Vehicle C
Topic: Braking System
Replies: 27
Views: 904

Re: Braking System

When we used a two sided wingnut, it would get caught and stop the car even on the way forward. How do you implement it so that it doesn't? How do you securely attach the rubber stopper on only one side of your dowel? I do not recommend using a dowel because it is wood and it will wear and shrink a...
by sciencecat42
April 10th, 2019, 7:53 pm
Forum: Boomilever B/C
Topic: Balsa Wood Grain
Replies: 7
Views: 451

Re: Balsa Wood Grain

Sorry I'm a bit confused about your post. Did you end up using C grain or A grain? And how much does the grain actually matter? I tried making a design with 1/4x1/8 balsa sticks today and it barely held any sand before the whole compression structure began to bow upwards. I did put the 1/4" end...
by sciencecat42
April 10th, 2019, 12:55 pm
Forum: Boomilever B/C
Topic: PICTURES, SCORES, VIDEOS!!
Replies: 162
Views: 19990

Re: PICTURES, SCORES, VIDEOS!!

Just to clarify, when you guys mention box beam/compression box, do you basically mean 4 main compression sticks but connected with bracing? Box beam refers to hollow compression members. Compression box refers to 4 main compression members, aka the tower chimney. Ah I see. Does box beam mean using...
by sciencecat42
April 10th, 2019, 11:37 am
Forum: Boomilever B/C
Topic: PICTURES, SCORES, VIDEOS!!
Replies: 162
Views: 19990

Re: PICTURES, SCORES, VIDEOS!!

Just to clarify, when you guys mention box beam/compression box, do you basically mean 4 main compression sticks but connected with bracing?
by sciencecat42
April 10th, 2019, 9:55 am
Forum: Mousetrap Vehicle C
Topic: Braking System
Replies: 27
Views: 904

Re: Braking System

You don't need to saw off one side of the wing nut. When it flips over you just need something to stop it on the way back from its starting point. Think of it this way ... 8 meters forward and between 1 and 6 meters back depending upon Regional, State, or National Rules. You can just vary your star...
by sciencecat42
April 9th, 2019, 4:55 pm
Forum: Mousetrap Vehicle C
Topic: Braking System
Replies: 27
Views: 904

Re: Braking System

We tried to implement the one sided wingnut braking method, but after sawing off a wing, it won't flip over when the car reverses. Is there any solution to this issue or an alternative reliable braking method?
by sciencecat42
March 31st, 2019, 5:44 pm
Forum: Boomilever B/C
Topic: Boomilever B/C
Replies: 361
Views: 30058

Re: Boomilever B/C

I found that using two 1/4 by 1/8 balsa for compression and 1/16 by 1/16 balsa for tension will yield very good results. Isn't 1/16 balsa super weak? As long as you don't taper it the tensile force alone I found to be sufficient How do you glue the distal end? Isn't the gluing surface area very sma...
by sciencecat42
March 30th, 2019, 9:08 am
Forum: Boomilever B/C
Topic: Boomilever B/C
Replies: 361
Views: 30058

Re: Boomilever B/C

wzhang5460 wrote:I found that using two 1/4 by 1/8 balsa for compression and 1/16 by 1/16 balsa for tension will yield very good results.


Isn't 1/16 balsa super weak?
by sciencecat42
March 23rd, 2019, 8:29 am
Forum: Boomilever B/C
Topic: Testing Apparatus Guide/Materials
Replies: 4
Views: 339

Testing Apparatus Guide/Materials

Does anyone know of a guide or bill of materials that exists for building a Boomilever testing wall/apparatus? I want to build one for our team that we can use for Boomilever and other wood events in the future.
by sciencecat42
March 11th, 2019, 6:32 pm
Forum: Boomilever B/C
Topic: PICTURES, SCORES, VIDEOS!!
Replies: 162
Views: 19990

Re: PICTURES, SCORES, VIDEOS!!

1. Well if varies but best boom designs to use are compression boxes. Thanks, that is nice to know. I've been building a few compression box designs but none have reached 1000 yet. Guess I'll keep building them. If any design is going to consistently break 2000+ it will be the compression box. I sp...
by sciencecat42
March 11th, 2019, 6:30 pm
Forum: Mousetrap Vehicle C
Topic: How do you attach a plastic caliper to the vehicle?
Replies: 19
Views: 725

Re: How do you attach a plastic caliper to the vehicle?

But because of the way my vehicle was designed, both bearings need to move in order for the axis to move. If one bearing can't move, the other bearing on the axle can't move either. Don't mean to be harsh, but there's a flaw with your vehicle design then. :p You should be able to fix one bearing so...
by sciencecat42
March 11th, 2019, 6:27 pm
Forum: Boomilever B/C
Topic: PICTURES, SCORES, VIDEOS!!
Replies: 162
Views: 19990

Re: PICTURES, SCORES, VIDEOS!!

TheChiScientist wrote:1. Well if varies but best boom designs to use are compression boxes.


Thanks, that is nice to know. I've been building a few compression box designs but none have reached 1000 yet. Guess I'll keep building them.
by sciencecat42
March 11th, 2019, 6:18 pm
Forum: Mousetrap Vehicle C
Topic: Aiming
Replies: 13
Views: 835

Re: Aiming

I'm not the best at geometry, so for a fixed curve, what angle do you usually point to the right? Is it the same every time or does it change depending on the location of the VTP?
by sciencecat42
March 11th, 2019, 6:15 pm
Forum: Mousetrap Vehicle C
Topic: How do you attach a plastic caliper to the vehicle?
Replies: 19
Views: 725

Re: How do you attach a plastic caliper to the vehicle?

How do you mount it in a way that produces an angle? When I tried to mount the caliper, the whole entire axle moves straight back and forth perpendicular to the main body. You have two bearings holding your axle. One needs to be fixed to the main body, the other needs to be adjustable. The axle sho...

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