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Class D rules question

Posted: Thu Nov 15, 2018 1:23 pm
by mac_xpert
Pressure vessel and fuselage of rocket must be constructed from a single unmodified soft drink bottle which cannot exceed 2 liters (labeled capacity) volume. (commercially produced stretched or modified bottles such as the U14 stretched water rocket bottle by Anti Gravity Research are not allowed)..
Are you able to add volume to the bottle if you leave it intact and unmodified and only use one bottle and do not exceed the 2l limit?

Re: Class D rules question

Posted: Thu Nov 15, 2018 7:05 pm
by WRA2
No you may not alter or modify the bottle in any way. You can choose any shape bottle you wish or even use a bottle that is smaller than 2 liters. There are a lot of possibilities.

Good Luck.

Re: Class D rules question

Posted: Fri Nov 16, 2018 12:27 pm
by mac_xpert
3.Reaction Mass must be primarily ordinary tap water.
By inclusion of the word 'primarily' am I allowed to try different additives to the tap water?

Re: Class D rules question

Posted: Fri Nov 16, 2018 11:08 pm
by WRA2
You can try different additives in the water but please be kind to the environment. An example would be to add salt to the water to prevent freezing or adding sugar to increase viscosity. Flammable additives are prohibited.

Re: Class D rules question

Posted: Wed Feb 06, 2019 12:47 am
by anachronist
Huh, I didn't know contestants could add stuff to the water. Salt would make the water more dense, for example.

Re: Class D rules question

Posted: Sun Feb 10, 2019 10:17 am
by WRA2
anachronist wrote:
Wed Feb 06, 2019 12:47 am
Huh, I didn't know contestants could add stuff to the water. Salt would make the water more dense, for example.
3. Reaction Mass must be primarily ordinary tap water.

The rule does allow some leeway for small amounts of additives.