Ye Olde Rocket Forum

Ye Olde Rocket Forum (http://www.oldrocketforum.com/index.php)
-   Designer's Studio (http://www.oldrocketforum.com/forumdisplay.php?f=27)
-   -   BARCLONE Designer's Studio 2008 (http://www.oldrocketforum.com/showthread.php?t=2163)

snaquin 11-05-2007 10:54 PM

Quote:
Originally Posted by CPMcGraw
Obviously, there are some important exceptions to such a rule. Can anyone remember if the Apogee Newsletter ever covered this topic?


I don't remember it being covered in the Apogee Newsletter and I usually do read the articles that deal specifically with RockSim. I may have overlooked it though. I may email Tim and see if he can shed some light on this feature. I had an entry for an EMRR virtual rocket contest that had a transition and reverse transition close to the nose cone and remember not being able to figure out why the calculations were so far off. I wasn't aware of this feature at the time so I trashed the design and went another direction.

.

snaquin 11-05-2007 10:57 PM

1 Attachment(s)
Quote:
Originally Posted by CPMcGraw
Nice going, Steve! Those coupons do come in handy for "special" purchases...

Translation: She can use 'em, too... :D

Now I can run the sim over again and get a more accurate profile...

The altitude came to 1138' with a slightly reduced Dv, down to 24 FPS, when burning the D12-5.

Interesting outcome with the C11-5. I get 565' with a Dv of 8 FPS. That's a really nice, clean flight with low velocity over the top.

Both motors seem to need a 48" x 3/16" rod with this bird, as they take at least 33" of guide length to reach flight V. An extra 12" wouldn't hurt.

What I really want is a "D" bird that Dv's below 10 FPS, and still gets off easily on a 36" rod. This one comes close, but I want the next one to be a little quicker on the launch.


Craig,

I did get a little progress on the 24mm AV Booster tonight. Engine mount is finished and mounted with kevlar shock cord anchor and fins are cut and covered with label paper and edges sealed with CA. I would normally use a Semroc ST-13 baffle but I'm trying to get it built to paint this weekend since our next launch is on Nov. 17 and I want to fly it at least a few times.

.

CPMcGraw 11-06-2007 12:31 PM

New Plan -- 24mm AstroVision Booster #2
 
3 Attachment(s)
Here's the second design for a 24mm "D" power booster for the AstroVision package. My goals were to create something that could get off the pad on a 36" rod, and pop-the-top with a moderate Dv. I think this design meets those goals. If it looks vaguely familiar, then understand that some designs just can't be improved upon, just adapted...

Length: 18.30"
Diameter: 1.375" (AV base diameter)
Fin Span: 3.34"
Weight: 2.27 oz

D12-7......1350'......Dv 18 FPS......36" x 3/16" launch rod (only needs 30")

The flight from GL to deployment is 8.2 seconds.

CPMcGraw 11-13-2007 09:11 PM

New Plan -- Snark
 
3 Attachment(s)
This one is a "Schoolyard Sounder".

Snark is a simple "Tau-styled" model with incredible performance on 13mm A3-4 motors. This is very likely going to be my next prototype!

Length: 18.27"
Diameter: 1.04" (BC-760)
Fin Span: 2.42"
Weight: 0.93 oz

A3-4T......460'......Dv 5.5 FPS......36" standard rod

Enjoy!

Tau Zero 11-14-2007 10:52 PM

"*Dude!* That's TAU Snarky!"
 
Craig,

This one definitely looks very "Snarky!" :cool: (No Apogee Components reference intended! :eek: )


Quote:
Originally Posted by CPMcGraw
Snark is a simple "Tau-styled" model with incredible performance on 13mm A3-4 motors. This is very likely going to be my next prototype!
(BEAVIS AND BUTT-HEAD VOICES) "Heh heh, heh heh. He said, 'Tau-styled.' --That was *cool.*"

(DUDE, WHERE'S MY CAR? VOICES) "*Dude.* -- *Sweet.*"


Cheers,

--Jay

James Pierson 01-05-2008 11:06 PM

New Design: Cap Ship
 
4 Attachment(s)
Now that is it 2008 look like we need to bring this thread back on top. Lately I have added all of the Semroc Classic tubes and balsa transitions to my database and my parts options have doubled. Still have yet to get around to the Centering Rings files. I also need to update alot of early designs using the Maximum Frontal Diameter and other necessary changes in the next year.

The bad news is that Tranquility 1 will need a slight redesign. Only found this out after it was built. There is a problem with the lower retaining cup that hold the pods. I use a 1/2 inch piece of ST-16 and the pods fit just fine, however there is no room for a streamer once they are wraped around the pods. The fix will be to change the ST-16 to an ST-18 and replace all the lower fins :( . This give enough room for the streamer and a little extra for easy deployment. This is called learning the hard way :rolleyes: .

Here is a ring fin design that I call the Cap Ship. It was inspired by a vintage cap toy that I saw on ebay. It uses 1 inch section of ST3030 which are about 3.6 iches in diameter.

Enjoy and Thanks Again, JP

Cap Ship (18mm)
Launch guide length: 36.0000 In

MOTOR.................MAX. ALTITUDE...........DEP. VELOCITY
A8-3..................152.30348 Ft.............14.5008 ft/s
B4-4..................382.48360 Ft..............5.1734 ft/s
B6-4..................389.86549 Ft..............3.6389 ft/s
C6-5..................867.97244 Ft..............1.8969 ft/s

James Pierson
NAR# 77907

CPMcGraw 01-06-2008 08:30 AM

Design Count
 
As I continue working on the website update, I am watching the number of designs gradually inching upward as I 'discover' some additional designs posted on the forum that were somehow overlooked. So, I thought I'd share these numbers with you for encouragement...

In the PROVENS category, we have 413 designs, the most recent being James Pierson's Cap Ship.

In the CONCEPTS category (designs that have either not been sufficiently debugged, or cannot be simulated with RockSim) we have 41 entries.

This brings us up to 454 designs at the start of 2008. Can we make this number cross 500 before the end of the year? I think it's possible!

Also remember, now that we're into the new year, the "Scrounged...2007" thread is closed for new posts. All new submissions need to be posted here in the Designers Studio.

I'm looking forward to seeing what develops here!

Tau Zero 01-13-2008 02:28 AM

Laser Wolf -- Another mutated design
 
6 Attachment(s)
I did this one back in August, and sent it to Craig (so it may already count as a 2007 BARCLONE design) , but I unearthed it again this week. I sent propaganda to JP and BillE, but apparently I didn't share it with the rest of the forum until now. :o

From the Can't Leave Well Enough Alone Department, this is,

"A collision between Wolverine #0861 and Laser Torpedo #1311 -- Upscaled to 1.68X."


Any comments or suggestions (aside from, "So, tell us about these voices you hear in your head" :eek: ) are welcome.


Cheers,

CPMcGraw 01-13-2008 07:22 PM

Quote:
Originally Posted by CenturiGuy
I did this one back in August, and sent it to Craig (so it may already count as a 2007 BARCLONE design) , but I unearthed it again this week. I sent propaganda to JP and BillE, but apparently I didn't share it with the rest of the forum until now. :o

From the Can't Leave Well Enough Alone Department, this is,

"A collision between Wolverine #0861 and Laser Torpedo #1311 -- Upscaled to 1.68X."


Any comments or suggestions (aside from, "So, tell us about these voices you hear in your head" :eek: ) are welcome.


Cheers,


AKA "Laserene"...:p

Be sure to look at those "launch guide lengths" in the sim sheets. Both the C11 and the D12 require 48" x 3/16" rods. The E9 takes 47 out of 48, so you need a 60" rod or tower.

I still like the design. "She jus' needs more power, Capt'n..." :o

...And as for those voices, you might try a few generous doses of " PF Dark Side" and "AP Valid Path". (Now there's a combination of music: A Valid Path to the Dark Side...)

James Pierson 01-13-2008 08:37 PM

Laser Wolf on Diet
 
Looks great Jay, however after a closer look the Laser Wolf is a bit heavy as Craig has suggested. Its also way overstable. Both heavy and overstable are to blame for the take off speeds and launch rod length required.
Might concider the following:
Change from Nylon to plastic chute (Nylon Heavy)
Upper fins to 1/16" thickness
Other fin to 3/32" thickness
Reduce large lower fins size by 25% or so
Reduce length of upper BT-60

Hope this is helpful, and don't worry, I have to do the design diet thing all the time with my freaky design. ;) .

James Pierson
NAR# 77907


All times are GMT -5. The time now is 04:25 AM.

Powered by: vBulletin Version 3.0.7
Copyright ©2000 - 2021, Jelsoft Enterprises Ltd.