Nytrunner
Pop lugs, not drugs
In the meantime, eagerly awaiting the reveal of the painted model. I fully expect to see it festooned with DRM decals.
DRM?
In the meantime, eagerly awaiting the reveal of the painted model. I fully expect to see it festooned with DRM decals.
Now that you've pointed it out AND I actually took the time to look at the legend it isn't that bad at all. Also get the point about all the cool colors/vortices but that bubble and column of air shown "stacking" up ahead of the nose would be much less pronounced on say a 5 to 1 ogive? I've seen past posts where you've done cfd analysis and don't recall that rather strange artifact? Outstanding job by the way, I still type with two fingers and grab the nearest kid when I have a problem with my phoneLol, that's just a high pressure region at the end of the nose. If you look at the legend, you'll see that area is all over 15.2 psi. Since atmospheric is 14.7, it's really not too high at all really.
If I was being paid for any of this analysis, I'd set Red to be a danger threshold, but then the whole rocket would be dark blue and boring. Since this is for my own entertainment, I set the rainbow chart so it looks good, and that's about it. Maybe I'll tweak it so it doesn't look like my nose is in danger of being crushed.
Now that you've pointed it out AND I actually took the time to look at the legend it isn't that bad at all. Also get the point about all the cool colors/vortices but that bubble and column of air shown "stacking" up ahead of the nose would be much less pronounced on say a 5 to 1 ogive? I've seen past posts where you've done cfd analysis and don't recall that rather strange artifact? Outstanding job by the way, I still type with two fingers and grab the nearest kid when I have a problem with my phone
Assuming the nose weights are going to be quick change for larger motors?
That looks great! Good luck on your flight.
Heck of a good flight. Too bad about the test, but you’ll get it next time, and the rocket is good to go.
No waiver breaking fortunately, although the altitude is....interesting.
Real reason I'm not certified is that I should have reviewed the L2 test a bit more. I missed a couple extra procedural questions, so I've got some study to do. My focus the last couple months has totally been on preparing the rocket and deployment, so the test became an afterthought. I was disappointed, but it brought to light some stuff that would be good to get deeper into the memory, so I treat it as a learning experience.
Then, as I was packing up and resigning myself to flying smaller rockets that day, the other fellow HARA member that attended NARAM walked up and asked how things went. I shared the bad news and that I'd be flying my other rockets. He said "Well, there will be other chances to take the test. You also drove all the way here to fly this rocket, so would you want to finish prepping it and fly it under my certification?" Directly following that, the L3 gentleman who had inspected Long Tom and discussed the test with me walked up and said "You've got some review to do, but I believe you know what you need to work on and you've built a good rocket. You won't be certified, but do you still want to fly it today?". Of course I wanted to fly it.
I hook up the shock cords, button up the ebay, and Club member and L3 both help me get it out to the tall pad and ready to go. Other than passing the test, I couldn't have asked for a better day. (Heck, another L2 candidate had a motor blowout after passing his test) Got tons of great advice, plenty of compliments on the rocket, and a great video (vv). This is a great hobby!
If you think about it, my L2 rocket now has a 90%K flight test under its belt
Some highlights:
:05 Liftoff Silhouette outlines the wings perfectly
:08-:12 Fin flutter modes! The wiggle makes me cringe, but they stayed on!
:55 Payload and drogue make an appearance. Best I can tell, the payload hangs under the drogue fine, but the wings on the booster made it do whatever it wanted.
1:50 Great view of the shadow touchdown
View attachment 359063 View attachment 359064
Prime and backup altimeters are within 9' of each other. 6980 and 6971 respectively for the RRC3 and Stratologger.
Recall from earlier in the thread, I was expecting a tad over a mile on the K750. Getting the flight data back, I started fiddling with OR to see what happened.
I had set my finish to regular paint because I've got mask lines and vinyl striping all over. Also double checked my environmentals for Pueblo's launch site.
Still wasn't much more than a mile. So I change my fins from rounded airfoil and bump the finish to smooth paint. No dice.
Eventually, I set the whole thing to Polished (lol) and it still won't go over 6200'. Nothing I can do to that sim file (with accurate final weight and measurements) can account for the ~800 extra feet that the altimeters are reporting. Maybe it's something to do with the nosecone profile being aerodynamically better than OR's? Go figure.
Have you overridden the Coefficient of Drag? Make everything else match what you believe they really are (including actual barometric pressure and elevation of launch site), then change the Cd until you get the same altitude you flew.
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