@watheyak,
The current OpenRocket sim puts our N5800 around Mach 3.5, but we're assuming that's a healthy over-projection considering RasAero and RockSim place it lower right around 2.8-9. It may seem overkill to use such a big motor, but it's the exact one we already use as the main motor in our Spaceport two-stage rocket, so it's familiar and we'd like to do more testing on it anyway.
@robopup,
I'm working on a calculator to give us stagnation temperature using sim data. We've found OR isn't reliable with Mach projections, so I'm trying to figure out all the math behind it so we have something solid to go off of. I want to be able to confidently say how long our rocket will be spending in each Mach region because if we only break Mach xyz for a split second and the duration of the flight is in xyz region, we can have a better idea of the stresses the rocket will experience. Also still working on sims to calculate heating.
I'll talk about this in my own build thread once we have a pretty product to show for it, but right now we're figuring out our NC. We're obviously going to have an aluminum tip, but we're also going to be putting temperature probes throughout the NC and tip so that we can compare to sim data. This is what we want to know for our larger two-stage rocket, although heating effects aren't nearly as big of a concern with that rocket.
Here's an idea I want to run past some people. If we're concerned about heating in the NC, would it be beneficial to have a layer of kevlar built into the layup? The entire NC was going to be fiberglass to allow for our eBay to function properly.
The current OpenRocket sim puts our N5800 around Mach 3.5, but we're assuming that's a healthy over-projection considering RasAero and RockSim place it lower right around 2.8-9. It may seem overkill to use such a big motor, but it's the exact one we already use as the main motor in our Spaceport two-stage rocket, so it's familiar and we'd like to do more testing on it anyway.
@robopup,
I'm working on a calculator to give us stagnation temperature using sim data. We've found OR isn't reliable with Mach projections, so I'm trying to figure out all the math behind it so we have something solid to go off of. I want to be able to confidently say how long our rocket will be spending in each Mach region because if we only break Mach xyz for a split second and the duration of the flight is in xyz region, we can have a better idea of the stresses the rocket will experience. Also still working on sims to calculate heating.
I'll talk about this in my own build thread once we have a pretty product to show for it, but right now we're figuring out our NC. We're obviously going to have an aluminum tip, but we're also going to be putting temperature probes throughout the NC and tip so that we can compare to sim data. This is what we want to know for our larger two-stage rocket, although heating effects aren't nearly as big of a concern with that rocket.
Here's an idea I want to run past some people. If we're concerned about heating in the NC, would it be beneficial to have a layer of kevlar built into the layup? The entire NC was going to be fiberglass to allow for our eBay to function properly.