Ye Olde Rocket Forum

Go Back   Ye Olde Rocket Forum > Semroc > SVDT - Semroc Virtual Design Team
User Name
Password
Auctions Register FAQ Members List Calendar Today's Posts Search Mark Forums Read


Reply
 
Thread Tools Search this Thread Display Modes
  #231  
Old 02-23-2009, 09:28 PM
Pyro Pro's Avatar
Pyro Pro Pyro Pro is offline
Rocket Scientist
 
Join Date: Apr 2006
Location: University of Michigan
Posts: 224
Default

Well, turns out the problem was that all the tiny "fins" I had on the outside of the pods to simulate the strap-on holding mechanisms was really messing with the drag coefficient, which was up around 300

Cd override was set to 0.80, and the results look much more respectable!

Flights look fairly nice on black powder, especially the (2x) B6-2 and E9-4 (though an E9-5 would give a bit better Dv's, 4.5 would be even better) flight, which clears a 36" rod, stages at about 80-100 feet, and stays under 1000. This ought to really fly even nicer with high-thrust A's or B's in the pods for demo flights.

[2] B6-2 -> E9-4 ..... 992' ..... Dv 18.7 ft/s ..... 3/16" x 36"
[2] C6-3 -> E9-5 ..... 1196' ..... Dv 2.4 ft/s ..... 3/16" x 36"
[2] D10-3 -> F12-5 ..... 1735' ..... Dv 9.1 ft/s ..... 3/16" x 36"

Now I need to find time to build it! I've always liked parallel-staged designs, but I've never built one before, just read reviews of kits and diagrams of how they work.

(It turns out those strange ring things in the base view were artifacts of the centering rings inside the pods. I removed the rings for now, since they hardly add any weight, and aren't hard to add back in [rear ring is a double-layered piece of fiber, 0.1" thick, forward ring is standard 0.05"].)
Attached Files
File Type: rkt Straponski.rkt (197.6 KB, 12 views)
__________________
David Hash
NAR#77967
http://www.Semroc.com
Reply With Quote
  #232  
Old 03-05-2009, 09:51 PM
Pyro Pro's Avatar
Pyro Pro Pyro Pro is offline
Rocket Scientist
 
Join Date: Apr 2006
Location: University of Michigan
Posts: 224
Default

Parts are here! Now to build...
Attached Thumbnails
Click image for larger version

Name:  PICT9964.JPG
Views: 19
Size:  120.9 KB  Click image for larger version

Name:  PICT9965.JPG
Views: 18
Size:  143.7 KB  Click image for larger version

Name:  PICT9968.JPG
Views: 15
Size:  68.5 KB  Click image for larger version

Name:  PICT9969.JPG
Views: 14
Size:  58.8 KB  Click image for larger version

Name:  PICT9971.JPG
Views: 14
Size:  86.2 KB  Click image for larger version

Name:  PICT9972.JPG
Views: 13
Size:  56.7 KB  Click image for larger version

Name:  PICT9975.JPG
Views: 17
Size:  104.9 KB  Click image for larger version

Name:  PICT9977.JPG
Views: 16
Size:  85.4 KB  
__________________
David Hash
NAR#77967
http://www.Semroc.com
Reply With Quote
  #233  
Old 03-05-2009, 10:03 PM
snaquin snaquin is offline
The_Ripper
 
Join Date: Jun 2005
Location: Louisiana
Posts: 1,941
Default

Looking forward to this build David ..... looks challenging!

.
__________________
Steve Naquin
TRA# 677 L2
NAR# 85518 L2
SAM# 0052

🚀 In Construction: Der Blue Maxx/Minie-Magg 5.5” & Vander-Burn MDRM Clone w/Stickershock23 Custom Decals
🚀 In Paint & Detail: USR Banshee
🚀 In Build Queue: Estes Doorknob w/Vander-Burn Rocketry Upgrade Kit [Sport Decor], Semroc Centurion-F, Semroc Egg Crate
🚀 In Repair: SLS Lil’ Hustler, SLS Aero-Dart 1969 Trim
🚀 Stay Tuned For Fall 2021 Launch Dates
Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump



All times are GMT -5. The time now is 09:12 AM.


Powered by: vBulletin Version 3.0.7
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Ye Olde Rocket Shoppe © 1998-2024