- Joined
- Oct 22, 2011
- Messages
- 266
- Reaction score
- 417
haha I guess I have a new name for it! I’ll have to get a creamsicle decal made for the backside.
Ages ago there was a brand of those called Fifty-Fifty Bars where the orange Sherbert and vanilla ice-cream were mixed in a swirly pattern.haha I guess I have a new name for it! I’ll have to get a creamsicle decal made for the backside.
Interesting. The old recommendations from Adept, suggested never using two to eliminate cross flow and to use three or four holes. I suppose the odd number thing makes sense.I was always told to use an uneven number of vent holes. Helps to not ge a cross wind into and out of altimeter. Use 1 or 3 vent holes.
Tommy always told me uneven number.Interesting. The old recommendations from Adept, suggested never using two to eliminate cross flow and to use three or four holes. I suppose the odd number thing makes sense.
Either way we were pushing the limits on wind. The rocket was whistling while we were at the pad and I said out loud, “Think this could set off an altimeter?” Folks with much more experience told me they’ve never seen that happen haha. So we all learned about LDA settings on baro only altimeters without accelerometer
Interesting. The old recommendations from Adept, suggested never using two to eliminate cross flow and to use three or four holes. I suppose the odd number thing makes sense.
Tommy always told me uneven number.
Then I think you run a similar risk during flight, of pressure differentials along the airframe. Adepts paperwork specifically says they should be on the same circumference line.Wonder if staggered holes vertically would help? Even if there are an even number, it wouldn't be a direct axis through across the cylinder.
Well if the man himself told you so then I’ll consider that in the next rocket! The paperwork that came with my Adept 22 (10 years ago) said three or four.
Then I think you run a similar risk during flight, of pressure differentials along the airframe. Adepts paperwork specifically says they should be on the same circumference line.
Adept I use is ATLS25. Maybe 22 is different. I have always used 1 or 3 and 30 years of flying HP I never ad a altimeter fire on the pad.Well if the man himself told you so then I’ll consider that in the next rocket! The paperwork that came with my Adept 22 (10 years ago) said three or four.
Then I think you run a similar risk during flight, of pressure differentials along the airframe. Adepts paperwork specifically says they should be on the same circumference line.
Nosecone got pushed in and my cardboard couplers got pretty soaked in the water. Also might have taken out the onboard RunCam2.
The nose cone dent is from the charge firing not the landing. This was the backup altimeter that fired. It had an extra half gram to guarantee things separated if the first charge hung up, mission accomplished! Dents already pulled out just needed a heat gun.All that damage from a short fall to the ice? Seems like you might have the same problems if the rocket landed normally under chute?
Sorry to hear about this mishap. I enjoyed your build threads and videos.
ARE YOU SURE YOU'VE CLEARED OUT ALL THE FLAMMABLE UNDERGROWTH FROM THAT LAUNCH SITE????
Hey! Three months later things have thawed out in the north east and summer rocket season is here. I was able to drive up and meet the nice group of folks at Tripoli Cherryfield, and launch the Doorknob for a successful L2 certification.
CTI J381 Skidmark
Weight on the Pad: 18.5 lb
The Eggtimer Quantum said 768 feet
The Adept22 Beeped out 679 feet
Plenty stable even with moderate winds, no nose weight required.
I would recommend some more impulse if you're going dual deploy. By the time my drogue was settled the main charges were deploying. My nose cone actually swung around and back through the main chute shroud lines and foiled the main a bit. Between a half main, a drogue, and the robust fiber glassing the rocket was completely unscathed even though it touched down between 30-40 feet per second. Good enough!
Now looking for the next motor. I'm thinking the biggest 54mm Aerotech I can get to try out some my new hardware I'd love to hear peoples favorites.
54mm - 2800 or 2560.Which Hardware?
54mm - 2800 or 2560.
I also have a 1280 case and the adapters for everything 426-2800 but might as well go big!
54mm - 2800 or 2560.
I also have a 1280 case and the adapters for everything 426-2800 but might as well go big!
Yes, try Vern Knowles website. He has an article about that.Has anyone heard any other source of the recommendation of "not two" or "an odd number" of vent holes? I also heard it from Adept back in the day, and followed it over the years. However, I've never heard a convincing reason nor heard it from other manufacturers, so it could be just a quirk of the Adept units.
Anyone have an independent source for this rule of thumb?
Has anyone heard any other source of the recommendation of "not two" or "an odd number" of vent holes? I also heard it from Adept back in the day, and followed it over the years. However, I've never heard a convincing reason nor heard it from other manufacturers, so it could be just a quirk of the Adept units.
Anyone have an independent source for this rule of thumb?
I found this article: https://www.vernk.com/AltimeterPortSizing.htmYes, try Vern Knowles website. He has an article about that.
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