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
  #11  
Old 01-02-2007, 08:05 PM
CQBArms's Avatar
CQBArms CQBArms is offline
Intermediate Rocketeer
 
Join Date: Oct 2006
Location: Western MA
Posts: 45
Send a message via AIM to CQBArms Send a message via MSN to CQBArms Send a message via Yahoo to CQBArms
Default

Now this is a huge step up for contemporary BP engines!
Reply With Quote
  #12  
Old 01-02-2007, 08:49 PM
CPMcGraw's Avatar
CPMcGraw CPMcGraw is offline
BARCLONE Rocketry
 
Join Date: Mar 2005
Location: Mobile, Alabama
Posts: 5,355
Default

Quote:
Originally Posted by Carl@Semroc
...Here is a preliminary lineup...


What body tubes are available for the 15mm and 10mm motors? These look like they could generate some interesting models.

Something I thought about as a possible sideline item -- Pre-packaged deployment charges (not delay chains) for use with electronic triggers, each with specific amounts of pyro, and with two firing ports (one at each end) for redundancy triggering. Not exactly what we'd be using with our smaller models, but possibly for some of those upper-end 29mm birds...

I see the DECAPs used for the 13mm and 10mm motors, but can this be adapted for the 18mm as well? Or does the pressure generated in the 18mm package exceed the limits for whatever adhesive/mechanical fixatives will be used?
__________________
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
Reply With Quote
  #13  
Old 01-02-2007, 09:03 PM
Carl@Semroc's Avatar
Carl@Semroc Carl@Semroc is offline
Junior ??? Rocketeer
 
Join Date: Mar 2005
Location: Knightdale, NC
Posts: 1,470
Default

Quote:
Originally Posted by CPMcGraw
What body tubes are available for the 15mm and 10mm motors? These look like they could generate some interesting models.
None yet. The 10mm is the minimum allowed in FAI competition. The 15mm is a mid-size for B motors. Just a suggestion of possibility.
Quote:
Something I thought about as a possible sideline item -- Pre-packaged deployment charges (not delay chains) for use with electronic triggers, each with specific amounts of pyro, and with two firing ports (one at each end) for redundancy triggering. Not exactly what we'd be using with our smaller models, but possibly for some of those upper-end 29mm birds...
The Ejection-only DECAP is a pre-packaged deployment charge.

Quote:
I see the DECAPs used for the 13mm and 10mm motors, but can this be adapted for the 18mm as well? Or does the pressure generated in the 18mm package exceed the limits for whatever adhesive/mechanical fixatives will be used?
The 13mm DECAP glues inside an 18mm engine. The 10mm DECAP glues inside a 13mm engine. Probably a potential source of confusion.

The 13mm DECAP (for 18mm standard engines) will probably be the one we do. If it is popular, we might add the 10mm. One of the primary advantages of the DECAP is precision times. The accuracy of a standard engine is only as accurate as how much of the propellant "runs" up around the ram. The DECAP eliminates this variable. Another advantage is the ability to pick in-between times for models that don't fit the 2 second spread.
__________________
Carl McLawhorn
NAR#4717 L2
semroc.com
Reply With Quote
  #14  
Old 01-02-2007, 09:08 PM
CPMcGraw's Avatar
CPMcGraw CPMcGraw is offline
BARCLONE Rocketry
 
Join Date: Mar 2005
Location: Mobile, Alabama
Posts: 5,355
Default

Quote:
Originally Posted by Carl@Semroc
...The Ejection-only DECAP is a pre-packaged deployment charge...

...The 13mm DECAP glues inside an 18mm engine. The 10mm DECAP glues inside a 13mm engine. Probably a potential source of confusion...


Now I understand. Thanks.

One presumes the "ejection-only DECAP" can be fired with an igniter, not just as part of a motor assembly?
__________________
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
Reply With Quote
  #15  
Old 01-02-2007, 09:12 PM
A Fish Named Wallyum's Avatar
A Fish Named Wallyum A Fish Named Wallyum is offline
BP Mafia
 
Join Date: Mar 2005
Location: Ft. Thomas, KY
Posts: 7,023
Default

Quote:
Originally Posted by CPMcGraw
What body tubes are available for the 15mm and 10mm motors? These look like they could generate some interesting models.

Something I thought about as a possible sideline item -- Pre-packaged deployment charges (not delay chains) for use with electronic triggers, each with specific amounts of pyro, and with two firing ports (one at each end) for redundancy triggering. Not exactly what we'd be using with our smaller models, but possibly for some of those upper-end 29mm birds...

I see the DECAPs used for the 13mm and 10mm motors, but can this be adapted for the 18mm as well? Or does the pressure generated in the 18mm package exceed the limits for whatever adhesive/mechanical fixatives will be used?


One of the first things I did when stumbling back into the hobby in 2001 was buy a bunch of Apogee cones, rings and tubes. Somewhere in my shop I've got a mess of 10mm tubing that was part of the deal. I was all excited when I got the tubes, but he almost immediately ditched the 10mm motor line, so my excitement was short-lived. Guess I have to dig again.
__________________
Bill Eichelberger
NAR 79563

http://wallyum.blogspot.com/

I miss being SAM 0058

On the build floor: Estes - ESAM-58, Semroc Squire

In paint: RDC V-Max, Centuri Stellar Hercules

Looking for the decal: Estes Goblin

Ready to fly: Estes Astron Farside X, Estes Astron Apogee, FRW Star Jart, Semroc Cherokee D, Semroc SLS Scorpion
Reply With Quote
  #16  
Old 01-02-2007, 09:12 PM
Carl@Semroc's Avatar
Carl@Semroc Carl@Semroc is offline
Junior ??? Rocketeer
 
Join Date: Mar 2005
Location: Knightdale, NC
Posts: 1,470
Default

Quote:
Originally Posted by CPMcGraw
One presumes the "ejection-only DECAP" can be fired with an igniter, not just as part of a motor assembly?
That is correct. Since BP can not be used loosely in model rockets without a LEUP, there is a demand for a pre-packaged ejection charge in several "sizes" of BP loads.
__________________
Carl McLawhorn
NAR#4717 L2
semroc.com
Reply With Quote
  #17  
Old 01-02-2007, 09:23 PM
CPMcGraw's Avatar
CPMcGraw CPMcGraw is offline
BARCLONE Rocketry
 
Join Date: Mar 2005
Location: Mobile, Alabama
Posts: 5,355
Default

Quote:
Originally Posted by A Fish Named Wallyum
One of the first things I did when stumbling back into the hobby in 2001 was buy a bunch of Apogee cones, rings and tubes. Somewhere in my shop I've got a mess of 10mm tubing that was part of the deal. I was all excited when I got the tubes, but he almost immediately ditched the 10mm motor line, so my excitement was short-lived. Guess I have to dig again.


Is that what those tubes were? I've got a bunch myself, from the same source. I think I bought at least two bags of tubes a few years ago, before I knew about SEMROC or even BMS. I may have to look at these tubes again for future BARCLONE projects. They might be useful in some smaller "Schoolyard Sounders"...

For Carl: Those Apogee bags were likely filled with Euclid's tubes, so they may still have the mandrels for making them. The last time I checked the Apogee site, like Bill said, I think those tubes had been dropped from the packs (TVM has dropped them; I just looked), but they've been replaced with 29mm tubes.
__________________
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
Reply With Quote
  #18  
Old 01-02-2007, 09:39 PM
CPMcGraw's Avatar
CPMcGraw CPMcGraw is offline
BARCLONE Rocketry
 
Join Date: Mar 2005
Location: Mobile, Alabama
Posts: 5,355
Default

Quote:
Originally Posted by Carl@Semroc
...Another advantage is the ability to pick in-between times for models that don't fit the 2 second spread...


What will be the minimum delay tick? 1 Second or 1/2 Second intervals?
__________________
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
Reply With Quote
  #19  
Old 01-02-2007, 09:41 PM
Carl@Semroc's Avatar
Carl@Semroc Carl@Semroc is offline
Junior ??? Rocketeer
 
Join Date: Mar 2005
Location: Knightdale, NC
Posts: 1,470
Default

Planned is 1 second to keep inventory down.
__________________
Carl McLawhorn
NAR#4717 L2
semroc.com
Reply With Quote
  #20  
Old 01-02-2007, 09:42 PM
Carl@Semroc's Avatar
Carl@Semroc Carl@Semroc is offline
Junior ??? Rocketeer
 
Join Date: Mar 2005
Location: Knightdale, NC
Posts: 1,470
Default

We will probably get a slightly smaller BT-4 (.410"ID/.436"OD).

Tim's micros were 10.5mm. We wanted ours to be as small as possible within FAI limits.
__________________
Carl McLawhorn
NAR#4717 L2
semroc.com
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 04:42 PM.


Powered by: vBulletin Version 3.0.7
Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.
Ye Olde Rocket Shoppe 1998-2019