Has anyone tried to change the Centuri Bulldog's aft BT55 to an BT60 or ST16 and use two 18mm motors or maybe even three 18mm. Just a thought . It would change the rear dia or the transition a little but it will have better motor choices in theory.

James Pierson
NAR# 77907

OK, I've posted the names of as many of you I could locate who have submitted something to the BARCLONE project. I need everyone who does not already have your character totally assassinated to please scrape something together describing yourself in sad, suffering terms and send it to me via PM. Don't worry if it's short or lacks any panache -- I'll embellish it for you. Just read what I did for poor James Pierson!

__________________
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

http://barclone.wordpress.com/meet-the-asylum-inmates/

IIRC, Craig actually had to *remove* some "embellishment" from James' somewhat lurid but compelling tale.


Cheers,

__________________
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

Lies, Lies, its all Lies!

Although my wife says " It's the cold hard truth and you know it."
Also she has a Rocket Widower's club meeting at 8pm on Tuesdays

James Pierson
NAR# 77907
.

"By your command!" (a little Battlestar Galactica nostalgia in recognition of last season of new series! )

Great suggestion James! Motor selection is much greater with a dual 18mm motor mount.

I changed out the BT-55 tube with a BT-60 and modified the custom paper tailcone accordingly. I changed out the BT-50 engine mount with an appropriate BT-20 mount and used the cluster wizard to complete.

Although I retained the 48" launch rod, most of these motor combinations easily reach safe velocity withing the standard 36" rod length. Here are the numbers and the additional design file.

Enjoy!

... Bill

Centuri Bulldog - Dual 18mm Engine Mount

Motor........Max Alt......DV..

2 x B6-4......293.88.....13.36
2 x B6Q-4.....344.94......4.32
2 x c6-5......761.03......4.22
2 x C6Q-5.....756.35......3.86
2 x D13-7....1611.95......8.63
2 x D21-7....1638.28......8.85
2 x D24-7....1525.36......3.15

Attached Thumbnails

 

Attached Files

Centuri Bulldog Dual 18mm.rkt (110.9 KB, 105 views)

This is a design from about two years ago, where I tried to simulate fin pods using profile nose cones and tail cones. I've just worked it up in R9, with real pods, and thought I'd post the results...

Length: 23.30"
Diameter: 0.908" (ST-8)
Fin Span: 5.403"
Weight: 1.34 oz


A8-3.......211'......Dv < 3 FPS
B4-4.......503'......Dv 13 FPS
B6-4.......510'......Dv 18 FPS
C6-5......1072'......Dv 19 FPS


Enjoy!

Attached Thumbnails

   

Attached Files

Apokalypsis MkII.rkt (84.6 KB, 98 views)

__________________
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

__________________
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

Ok, here is one I originally developed in Rocksim v8. The recent article in the Apogee Peak of Flight newsletter on canted engine files caused me to dust it off and re-work the design in version 9. The new pods feature allowed me to better simulate the model.

The design uses a combination of Semroc and Fliskit parts.

I present the MATaDor: Maxi Advanced Target Deuce!

Features:

- 2.2x Upscale of classic Estes Advanced Target Drone #1913
- Semroc Body Tubes & Nylon Parachute
- Fliskits' Deuce's Wild Dual Canted 24mm Engine Mount
- Fliskits' Deuce's Wild Nosecone (BT-70)
- Fliskits' Engine Baffle (BT-70)
- Basswood Fins (covered in cardstock)
- Cardstock Air Intakes

Simulation Data:

Length: 35"
Diameter: 2.217" (BT-70 / ST-13)
Fin Span: 19.017"
Weight: 12.6955 oz (including .5 oz nose weight and less engines)

Engine Size: Dual 24mm (Canted)

Launch Guide Length: 48" x 1/8"

Standard:

Motor.....Max Alt......DV

C11-3.....209.21.......4.11
D12-5.....577.68.......9.87
E9-6.....1044.89......14.95
E15-7....1585.44......12.20
E30-7....1490.86.......5.64

Canted 15 Degrees:

C11-3.....195.96.......0.62
D12-5.....547.22......14.56
E9-6.....1000.48......15.44
E15-7....1528.75......15.03
E30-7....1450.04.......5.65


I'm still working on adding the decals to the Rocksim design, but they are taking longer than anticipated. Let me know what you think.

Enjoy!

... Bill

Attached Thumbnails

       

Attached Files

	Canted 24mm Engines.rse (13.1 KB, 80 views)
	MATaDor.rkt (175.1 KB, 141 views)
	MATaDor Fins.pdf (28.8 KB, 117 views)

__________________
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

For some reason it never occurred to me to cluster the darn thing. I didn't mess with the shroud or rear tube sizes and just went with a 24mm mount. One thing's for a sure, a single 18mm as called for in the original plan is too limiting for motor choices, not to mention, altitude. Stabilty is marginal as well. Two words for this design: Nose weight. Love my Bulldog.


http://forums.rocketshoppe.com/show...51&postcount=11