(heavy sigh) Dave warned me about the terrible, awful puns involving his company's name. (Big evil grin) I put a few in my EMRR review, too.

Okay, Paul (and the rest of you), here you go. They're not terribly impressive, because I learned how difficult it is to prep the rocket, push the launch button, track the rocket, take pictures, and recover the rocket is for just one person. (I need an "exhausted" emoticon here.)

Attached Thumbnails

     

__________________
Jay Goemmer
"Centuri Guy"/"Tau Zero"
YORF Member 28
Semroc SAM #0029
NAR 86131


"I think about organizing things all the time. Never seems to happen. I find something that piques my interest and I'm off on a quest. Or a Centuri. "

--Bill Eichelberger, 02/22/2022


“Centuri fret buzz in an updated form.”
Bill “Wallyum” Eichelberger re: Estes Flutter-By
03 Sept 2014

(mock exasperation) I *told* you I had a box of stuff waiting for me to send it to you.

With TZ parts, among other things.


Cheers,

--Jay

Very clean "core sample" in that shot, Jay. The body tube doesn't look damaged at all.



What I meant to say was, the Prometheus "looks taller in person than it does on the screen"...

I now have the upper section all glued up and stacked into the lower section, and the fins have been cut, edge-sanded, and root-edge prepped. The proportions of the model just seem to "work"...



It's a good design, Jay. And using RockSim simply made it easier to "get it right" before building it. Watch out when you use "B" and "C" motors, though. The Dv numbers are a bit high (B4-4 and B6-6 are right at 30 FPS, and the C6-7 is 24 FPS), so you might want to use reefed shroud lines...

__________________
Craig McGraw

BARCLONE Rocketry -- http://barclone.rocketshoppe.com
BARCLONE Blogsite -- http://barclone.wordpress.com
BARCLONE Forum -- BARCLONE Forum

BARs helping BARs

SAM 0044
AMA 352635

Wow Jay! Great job on those! Looking at those pics makes me want to get moving on the "Crazy Diamond". I suppose that if you conceive it, you should build it. (Except for Craig, of course - he'd need 10 hands, 8 days a week and 36 hours to the day. )

__________________
John Lance Ladd
Yoyodyne Propulsion Systems
Grovers Mill, NJ
Established 1938
lladd.netau.net

Oh.
I didn't listen in school either. Or I did, then forgot.

__________________
Bill Eichelberger
NAR 79563

http://wallyum.blogspot.com/

I miss being SAM 0058

Build floor: Centuri Mini Dactyl Estes - Low Boom SST Semroc - Marauder, Shrike, SST Shuttle

In paint: Canaroc Starfighter Scorpion Estes F-22 Air Superiority Fighter, Multi-Roc, Solar Sailer II Semroc Cyber III

Ready to fly: Estes - Solar Sailer II Semroc - Earmark, Groonie Der V 1/2

Come on, give him a break.. I understand that he actually "primered" one once.

Or if you're like me, *AND* fly it, as well!

That reminds me of the old Rogue Aerospace motto: "Dream, build, fly, repeat."


Maybe 10 days a week, 48 hours a day, and a teeming swarm of assistants, no doubt.


Cheers,

--Jay

Funny. Bill said the same thing about me when we met at NARCON.


And I've discovered that's the unconscious part of the designing process. It's when my brain finally said, "Okay, *that's* cool. --Quit tweaking it now and leave it alone!"


That's an excellent suggestion. My RockSim numbers are slightly different from yours, since I only have the motor sticking out 1/4", instead of the default 1/2":


Motor / Alt. / Dv

A8-3 -- 223 ft. -- 5.9 fps
B6-4 -- 559 ft. -- 29.41 fps*
B6-6 -- 568 ft. -- 33.15 fps*
C6-5 -- 1237 ft. -- 43.28 fps*
C6-7 -- 1261 ft. -- 21.73 fps


But yeah, I'll need to do the "reefing" bit, for sure. I guess I'd have to recommend these motors: A8-3, B4-4 or B6-4, and C6-7. And maybe switch to a streamer for that "C" ... if you want your rocket back, that is.


Cheers,

--Jay

Aw, man. I don't do the reefing bit anymore. It made me eat fruit pies and Ho-Ho's and act stupid. (Insert Tommy Chong smilie here.)

__________________
Bill Eichelberger
NAR 79563

http://wallyum.blogspot.com/

I miss being SAM 0058

Build floor: Centuri Mini Dactyl Estes - Low Boom SST Semroc - Marauder, Shrike, SST Shuttle

In paint: Canaroc Starfighter Scorpion Estes F-22 Air Superiority Fighter, Multi-Roc, Solar Sailer II Semroc Cyber III

Ready to fly: Estes - Solar Sailer II Semroc - Earmark, Groonie Der V 1/2

(Mouth begins to speak, opens; finger points in air as if to emphasize an important utterance, stops; a loud, sharp silence suddenly fills the room for all to hear...)

Eeep...

You mean, a week doesn't have ten days?



That's all I ever allow on any design. Just enough to grab with fingers or a pair of pliers after the flight...



You could also cut back to a 10" parachute; the descent rate only increases to 13.125 FPS, which isn't too bad. RockSim recommended a 2.375" x 23.75" streamer for this design when using the C6-7 (the size of the streamer changes with the motor used...).

Update on my Prometheus model: I now have the motor mount and fins installed, only requiring the launch lug to be added. It'll be primer-ready by this time tomorrow.

__________________
Craig McGraw

BARCLONE Rocketry -- http://barclone.rocketshoppe.com
BARCLONE Blogsite -- http://barclone.wordpress.com
BARCLONE Forum -- BARCLONE Forum

BARs helping BARs

SAM 0044
AMA 352635