Ye Olde Rocket Forum

Go Back   Ye Olde Rocket Forum > Work Bench > Projects
User Name
Password
Auctions Register FAQ Members List Calendar Today's Posts Search Mark Forums Read


Reply
 
Thread Tools Search this Thread Display Modes
  #11  
Old 12-01-2017, 06:28 PM
Royatl's Avatar
Royatl Royatl is offline
SPEV/Orion wrangler
 
Join Date: Mar 2005
Location: Atlanta, GA
Posts: 2,235
Default

Quote:
Originally Posted by Royatl
I just measured the core depth of a 1975 Estes B14 and a 1990 B8 and found them to be within a hundreth of an inch of each other (0.68" from the casing edge, not the nozzle exit, though they appeared to be the same). The throat diameter of the B14 was 0.17" vs the B8's 0.145", so they were already de-tuning the B14 at that time.



I see that the one you tested was a Centuri one from 1973.

That may have been one that was actually manufactured at Centuri. I don't know when they shut down their machines (which had only been running two or three years), but I bet they didn't want to do the post-process drilling that Estes did, and that's what led to the development of the deep-pintle motors that Estes eventually adopted.

By the way. I haven't completely confirmed this, but I think you can usually tell Centuri manufactured motors by their labels. they had crisp printing and the motor designation was in reverse on a dark band. On later Estes manufactured Centuri motors, the motor designation band was just normal printing within a couple of borders, and the general look of the printing was a bit smudgier (is that a word?). The problem I still have with this is that the mini motors were printed the second way, and they were definitely not made on Estes machines (they had the longer casings and the partial graphite clay).
__________________
Roy
nar12605
Reply With Quote
  #12  
Old 12-01-2017, 07:16 PM
Vanel Vanel is offline
Master Modeler
 
Join Date: Jun 2005
Posts: 712
Default

Here's a pic of the Centuri B14-0 I tested...
Attached Thumbnails
Click image for larger version

Name:  IMG_9809.jpg
Views: 30
Size:  298.2 KB  
__________________
Up next:
Under construction:
Under repair:
In finishing: eBay rescue Mark II
In primer: Estes Boy Scout rocket (rebranded Ricochet)
In paint:
Ready for decals:

Bill Cooke
NAR #31312
SAM #0001
Huntsville, AL

My rocket blog
My rocket fleet
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 08:06 AM.


Powered by: vBulletin Version 3.0.7
Copyright ©2000 - 2018, Jelsoft Enterprises Ltd.
Ye Olde Rocket Shoppe 1998-2018