Somewhat silly question and apologies if you mentioned it previously, but did you set the launch pad altitude to ~1 mile ASL? Your back up altimeter screenshot shows your launch pad altitude was ~5,200 feet above MSL. That could easily account for the extra altitude you saw in actual flight vs sim flight. I like to call this the AAB effect. (AAB = Adrian Adamson/Balls)
Yup, I accounted for ground level, temperature, and average windspeed in sims.
What's the AAB effect? I feel like there's a story there
There is no single value override. You have to futz with finish/bevels, as you are doing.
Your design is pretty unique and probably more than the OR drag model can handle. How about using your CFD model to check Cd predictions?
More than likely, your motor burned better than the thrust curve.
I can guess which questions tripped you up - the legal mumbo-jumbo that is simply rote memorization and that you will never use in practice.
My mistake. I committed assumicide.
That's what I was remembering about OpenR.
Do you really think an elliptical, two forward wings, and a boattail is "pretty unique" for OR or too much to handle though?
Investigating the models is a logical next step. I'll have to make a better guess at the surface roughness if I want useable results.
And yes, you guessed correctly. I'll have you know that they'll stick in my mwory longer now, than they would have if I'd just crammed and spit them back out. Can't complain though. To paraphrase the gentleman that helped out, I failed and came back with a flight tested rocket. Others came back with a sack.
Bonus performance happens, but 13% over highest sim prediction? Oh well.
Beautiful flight! I may have committed parts of the L2 test to short-term memory for about an hour while I took it.
On the other hand, I know where to find standoff distance tables. My students' large project this year was about 8% over the polished surface, airfoiled fins OR prediction on the shakedown flight. However, it was a reliable 8%, so we were comfortable flying it to the edge of the waiver. Highest flight was 13,500 or so on a waiver of 14,000. You might just need an "altitude adjuster" percentage if you're close to the waiver.
Thanks Boat! (And everyone else that I haven't quoted).
Since I fly rockets with big airframe to motor ratios so far, I didn't think I'd have to worry about waiver busting. I may have to reevaluate that position lol
No sir I haven't. Most of my flights barely hit 1/4 mile. I hope to get a mile soon, if I can ever feel comfortable with the Eggfinder.
Keep practicing, you'll get there!
(and if you can put off a motor order or two, I'll once again recommend the Missile works T3)
It can even fin itself! (Thats a story for later)
