Thanks!!
I imagine that the cooking the propellant on a stove, part is a delicate process. That not many people will be able to do without exploding…The sad thing isn't that this guy may win a Darwin. It's that impressionable youngsters will look at that and think "Hey, it looks easy, let's try it!" If they're lucky they'll merely have to explain the huge cloud of smoke throughout the house, and the burn marks on the kitchen ceiling. **IF** they're lucky...otherwise
It looks like a I or J to me, just looking at size and the flight video.
That'd sound plausible based on size, I think, if it had a proper nozzle. But I'm probably a lousy judge. Based on performance, given the weight of that thing, if it were an I (let alone a J) it would have gone out of sight, probably never to return. But I'm still probably a lousy judge.
H I then.
He left double the diameter solid at the top, no issue there. MY only issue is HOW he melted the mixture, that wasn't the best method I have heard of...Nozzle-less motors are practical for mixtures that don't chuff easily and have a fairly high burn rate. A longer core is needed for such motors.
The coring rod should leave around one diameter of un-cored propellant at the forward end to hold pressure. I didn't watch the whole video to see whether that was done.
The sad thing isn't that this guy may win a Darwin. It's that impressionable youngsters will look at that and think "Hey, it looks easy, let's try it!" If they're lucky they'll merely have to explain the huge cloud of smoke throughout the house, and the burn marks on the kitchen ceiling. **IF** they're lucky...otherwise
I think even Colorado is flatter than a pancake, isn't it? Mountains look so imposing up close but are nothing compared to the size of a state.
We can make atomically smooth balls, so don’t know if I’ll believe that.
This is actually a common misconception based on the official regulation requirements for billiard balls. The balls must be 2.25 inches in diameter, +/- 0.005 inches, but that +/- 0.005 inches doesn't equate to that being the deviation from roundness or height between pits and peaks but rather the tolerance of the OD; instead the distance between peaks and pits is more like 1 to 5 microns (0.0000004 inches roughly on the low end). Scaling a billiard ball up to the size of the Earth (6371 km diameter) puts the scale of pits and peaks on the order of 43.9 meters or 144 ish feet, compared to 10.9 km for challenger deep or 8.85 km for Mt Everest. Going the other way, scaling down Earth to the size of a billiard ball, the highest/lowest points would be sudden bumps on the order of 200 microns, which is definitely enough to feel but you might have a hard time seeing.
At what size does a pond become a lake?
What about molehills?
That's Fish and Wildlife's department, not USGS.
) 19*C (66*F). So if the lab temperature changes a degree you can actually have to re-calibrate your spectrometer.
