Do you think I should go with the design?
What are you using for tracking & how are you going to initiate recovery?
Do you think I should go with the design?
What are you using for tracking & how are you going to initiate recovery?
This guy stuffed an Eggfinder and an Easy Mini in his 24mm carbon fiber frame for his "F" record.
https://www.rocketryforum.com/showthread.php?130457-Small-Tracker&p=1523544#post1523544
Steve Boetto's TRA F-altitude record was actually in a 29 mm single stage rocket using an Apogee F10 which brought it to 5407' AGL at sea level which is really impressive.
https://www.rocketryforum.com/showthread.php?130760-New-F-record-at-Bunnell-Florida
The NAR G-impulse record for a single stage G-impulse appears to be 6795' AGL in a 29 mm rocket using an AT G80-13T and recorded on a 12 gram PerfectFlite Pnut Logging Altimeter. (NAR requires a logging altimeter for altitude records). The unlimited G-altitude record appears to be 8665' AGL but I don't know if it was a single stage or multi-stage rocket but it was not recorded with an altimeter. A 24 mm 160 Ns G80 theoretically could reach 11.5 kft scaling from the NAR G-impulse record. A G150 will have more speed and more drag so it is not likely to go that high all else being equal so the flight should be interesting.
Added. If you want to make it cheap, how about starting out with a discontinued LOC Precision Mini Kit. The LOC website indicates some are left for $10 each. https://shop.locprecision.com/category.sc?categoryId=30 is a 24 mm LOC Hi-Tech mini complete with streamer. Ditch the 18 mm motor mount and use the Pro24. Ditch the balsa fins and use real A/C grade Baltic birch fins although 1/16' CF fins of this size would be cheap. Rocket would be ~$20 plus have plenty of room in the NC for a $50 Pnut ltimeter as well.
Bob
Bob,
The unlimited G altitude record was set using a G150 in a single stage 24 mm MD rocket. (https://www.rocketryforum.com/showt...G-motor-altitude-record-(unoffical-as-of-now)) That's why I planned to use the G150. The 29 mm G motors have too much drag, the other 24 mm G motors don't have enough performance and the G65 (which is the only motor in the Pro 24s to have more impulse than the G150) has an offset core, which will probably make the rocket corkscrew and lose the advantage of any extra altitude that it might get.
That is an interesting point - do moonburners really have asymmetrical thrust?
No, the offset core displaces mass on one side. With large, heavy rockets moonburners are fine, but with light, MD rockets they tend to corkscrew.
If you reread my post you will see I referenced the NAR records, not TRA, which was accomplished on a 29 mm G80. (I had forgotten the post your referenced which I had also posted in.) Please note that I had scaled the NAR result to a 24 mm 160 Ns G80 motor to obtain a potential altitude record of 11.7 kft for a 100%G 24 mm MD rocket. I also made the comment that I don't think you will get that apogee with a 150 N thrust motor because of the excess speed and drag.Bob,
The unlimited G altitude record was set using a G150 in a single stage 24 mm MD rocket. (https://www.rocketryforum.com/showt...G-motor-altitude-record-(unoffical-as-of-now)) That's why I planned to use the G150. The 29 mm G motors have too much drag, the other 24 mm G motors don't have enough performance and the G65 (which is the only motor in the Pro 24s to have more impulse than the G150) has an offset core, which will probably make the rocket corkscrew and lose the advantage of any extra altitude that it might get.
If you reread my post you will see I referenced the NAR records, not TRA, which was accomplished on a 29 mm G80. (I had forgotten the post your referenced which I had also posted in.) Please note that I had scaled the NAR result to a 24 mm 160 Ns G80 motor to obtain a potential altitude record of 11.7 kft for a 100%G 24 mm MD rocket. I also made the comment that I don't think you will get that apogee with a 150 N thrust motor because of the excess speed and drag.
Today I ran a few quick sims for an optimized 24 mm MD rocket in RASAero 2 and don't even break Mach with the G150 which is what I expected, and matched the current TRA G record apogee in the process. I also got a substantially higher apogee with the G65 which also breaks Mach by a small amount which again is in agreement with my previous comments.
Time for you to build, launch and see what you get.
Good luck.
Bob
Is there a pic of the NAR G altitude rocket?
Yeah, it looks great!
No matter which one you build, you're going to have to tweak it after each flight assuming you even recover it. Steve Boetto probably went though 5 different designs and lost 2 even with gps.
Hey TRFfan, how's your build going? Any updates? Looking forward to seeing some pics!
Your OR file has several errors or needed changes.
2 micron is not unreasonable.
20 micron is 400grit particle size.
2000 grit wet&dry is ~1micron
Mylar on fibreglass would easily meet 2micron.
Check a surface roughness gauge/comparator and I think you'd be surprised how rough 20u is.
Enter your email address to join: