Do i believe Aerotech or Rocksim

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highflyer1968

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I'm just wondering about the G-Force rocket from AeroTech. There website says a g77-4r will take it to about 700 feet but Rocksim says that at apogee it will be going 68.37 feet per second and a 6 second delay is good. Also AeroTech site says g80-7 will take it to about 880 feet but Rocksim says 1213 feet. Which one do I go by. All these numbers are giving me a headache.


HighFlyer1968
 
Rocksim tends to be a bit optimistic because the default surface finish defaults to 'polished', which a bit slicker than the average rocket finish. I would try setting the surface finish to 'matt" or 'unfinished' and rerun the sims. You should only use polished if you can use the rocket as a shaving mirror.
 
Both are guesses unless you've weighed your build. Aerotech's numbers are a general guide.... rocksim will let you put in many details to help dial it in.

Don't overthink it. a 4 or 7 is going to work on that rocket.... Use whatever is handy. Delays are never exact, and you don't need the rocket motionless at apogee for a good deployment.
 
mwtoelle said:
Rocksim tends to be a bit optimistic because the default surface finish defaults to 'polished', which a bit slicker than the average rocket finish. I would try setting the surface finish to 'matt" or 'unfinished' and rerun the sims. You should only use polished if you can use the rocket as a shaving mirror.
Click to expand...
Is that even physically possible?

I'm sitting here laughing picturing some old rocketeer walking around the house asking his wife... "HONEY!! HAVE YOU SEEN THE ROCKET? I need to shave...."


For the original question though.... Look through rocketreviews.com. That site has a bunch of reports of times that people have flown kits. You can see what other people have flown it on.
 
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blackbrandt said:
Is that even physically possible?

I'm sitting here laughing picturing some old rocketeer walking around the house asking his wife... "HONEY!! HAVE YOU SEEN THE ROCKET? I need to shave...."
Click to expand...

There were some threads a few years ago where someone showed how to get a mirror finish. It was a lot of work, far more than I am willing to do. I remember he posted a photo with a quarter on the table next to the rocket and you could clearly see the quarter's reflection on the rocket's fin. I mean you could read the letters and numbers in the reflection!
 
blackbrandt said:
Is that even physically possible?

I'm sitting here laughing picturing some old rocketeer walking around the house asking his wife... "HONEY!! HAVE YOU SEEN THE ROCKET? I need to shave...."

QUOTE]
I like to use an Alpha- makes me look younger and skinnier. For thiose pesky nose hairs I use a magnifying Minnie- Magg. Go with a gloss black and you don't have to dye your hair either!
Click to expand...
 
Zeus-cat said:
There were some threads a few years ago where someone showed how to get a mirror finish. It was a lot of work, far more than I am willing to do. I remember he posted a photo with a quarter on the table next to the rocket and you could clearly see the quarter's reflection on the rocket's fin. I mean you could read the letters and numbers in the reflection!
Click to expand...
Ahhh yes. Nathan.

This guy.
https://www.rocketryforum.com/showt...-The-Magg-(or-How-I-Spent-My-Summer-Vacation)

mmpp38.jpg
 
mwtoelle said:
...You should only use polished if you can use the rocket as a shaving mirror.
Click to expand...

I got your shaving mirror right here. Unfortunately after more than two years I finally lost this Estes Partizon last month when it drifted into the woods.

finsafteycode.jpg
 
WOW!

We had a member of our club (UROC) give a talk last month about finishing rockets. For that mirror like finish, he described how he starts with 400 grit sandpaper (after lots of other steps including filler, wet sanding, sacrificing a chicken, and painting), and starts wet-sanding the paint, finishing with 1600+. And maybe polishing compound.

I can safely say that, ignoring all of the steps that go into prepping the rocket for paint, and the steps for painting, I just don't have the patience to put that kind of finish on my rockets. I tip my hat to those that do, and stand in awe of your skill.
 
My late great G-force had altimeter readings of ~750ft on a G80, 1300ft on H128, and a tracked flight at NARAM on a 50N-S F to 450' or so. It had a pretty good finish and weighed only a little more than stock.

On the off-topic sub discussion here, for mirror finish I go 600-1200-2000 wet sanding followed by the chicken sacrifice and a very fine polishing compound.
 
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