Before we build our own rocket we need to ask – will it be too heavy?
We can estimate the weight and compare it to the kit rockets we've been using.
Component | Kit weight | Our weight | Difference |
---|
nose | 5.0g | 4.5g | -0.5g |
body | 3.6g | 22cm x 0.4g/cm = 8.8g | +5.2g |
fins | 1.3g | 3 x 2.1g = 6.3g | +5.0g |
recovery system | 1.9g | ??? | ??? |
Total | 11.8g | > 19.6g | > 9.8 |
---|
Thoughts
- Ours weighs at least 2/3 more than the kit. Is this a problem?
- If so, what could we do about it?
- If not, how do we know it's not?
- How will this effect the balance?
- Our nose is slightly lighter, and our fins are significantly heavier.
- This shifts the balance in the bad direction
- The difference is about evenly split between the nose and the body.
Conclusions
- The total weight isn't necessarily a problem
- The balance shift probably is
- We should probably focus on the fins
- Each fin is 1.9g paper and ~0.3g glue
- We could use single paper, cutting the weight to about 0.6g per fin
- We could use plastic
- We could use Styrofoam
- We could use foam core
- We could use balsa l(like the kits)
- The tubes are not as big of an issue but may still be worth addressing
- We should sacrifice one of the kit tubes and see how strong they are. We could also disect it.
- Non-destructive examination by shining a bright light gives...confusing data. It shows sign that they were engineered.
- We might get away with only two layers (cutting the weight to about 4.4g)
- Parchment paper might be a good idea (will you just give up!!?!)
- We might even get away with only a single layer (with a tiny overlap? How would that work? Spiraling!)