Ye Olde Rocket Forum

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


Reply
 
Thread Tools Search this Thread Display Modes
  #51  
Old 06-12-2021, 11:39 AM
Ez2cDave's Avatar
Ez2cDave Ez2cDave is offline
Banned
 
Join Date: Mar 2005
Location: Raleigh, NC Area
Posts: 1,743
Default

Quote:
Originally Posted by John Brohm


The "SPIDER" . . . By Josh Tschihart !

Dave F.
Reply With Quote
  #52  
Old 06-12-2021, 12:53 PM
ghrocketman's Avatar
ghrocketman ghrocketman is offline
President, MAYHEM AGITATORS, Inc.
 
Join Date: Jul 2005
Location: Nunya Bizznuss, Michigan
Posts: 13,443
Default

I would be willing to wager that less than ONE PERCENT of launches are performed by someone walking to their launch site unless on ones OWN PROPERTY. Thusly, it is an insignificant MOOT ISSUE discussing use of a car battery and it's weight. Nobody caters to the fringe 1% of their clientele unless it is for extreme luxury goods with giant profit margins per sale (Such as Ferrari automobiles or Patek Philippe watches).

I prefer to do it RIGHT (With a 5Ah+ Wet Cell with 12+V) or not at all.
Li-Po cells offer a lighter yet still high-current alternative. I wouldn't use 4AA cells for anything over a low current ELECTRIC MATCH.
__________________
When in doubt, WHACK the GAS and DITCH the brake !!!

Yes, there is such a thing as NORMAL
, if you have to ask what is "NORMAL" , you probably aren't !

Failure may not be an OPTION, but it is ALWAYS a POSSIBILITY.
ALL systems are GO for MAYHEM, CHAOS, and HAVOC !
Reply With Quote
  #53  
Old 06-12-2021, 03:49 PM
jdbectec jdbectec is offline
the middle-aged rocketeer
 
Join Date: Sep 2006
Location: Urbana, Illinois.....the birthplace of HAL
Posts: 468
Default

Back in my day my brother and I walk to our lunch site which was a few blocks from our house.We had a marvelous invention that we used to carry are ignition battery which I believe was an 8 volt deep cycle battery that came out of a golf cart for something of that nature.That invention was called a wagon and it had wheels and a handle you can pull it behind you with all your lunch equipment and your rockets stored in it I wish they still made those oh wait they do my brother still uses 1 to go out to the field His car when we launch at the Park with the club.
__________________
Jeffrey Deem
NAR16741
CIA section 527
Reply With Quote
  #54  
Old 06-13-2021, 11:30 AM
tbzep's Avatar
tbzep tbzep is offline
Dazed and Confused
 
Join Date: Mar 2005
Location: TN
Posts: 11,610
Default

Quote:
Originally Posted by John Brohm
Perhaps you might be thinking of this article:

http://meatballrocketry.com/pvc-spider/

That's it. I don't know why I was thinking it was the magazine.
__________________
I love sanding.
Reply With Quote
  #55  
Old 06-13-2021, 05:20 PM
Ez2cDave's Avatar
Ez2cDave Ez2cDave is offline
Banned
 
Join Date: Mar 2005
Location: Raleigh, NC Area
Posts: 1,743
Default

Quote:
Originally Posted by tbzep
That's it. I don't know why I was thinking it was the magazine.

That's because it IS in the magazine . . .

Dave F.
Attached Files
File Type: pdf MAGAZINE ARTICLE - COMPRESSED.pdf (1,004.7 KB, 22 views)
Reply With Quote
  #56  
Old 06-14-2021, 08:57 AM
tbzep's Avatar
tbzep tbzep is offline
Dazed and Confused
 
Join Date: Mar 2005
Location: TN
Posts: 11,610
Default

Quote:
Originally Posted by Ez2cDave
That's because it IS in the magazine . . .

Dave F.

So I'm not crazy for thinking I read it in the NAR mag. I'm not saying I'm not crazy...just not crazy for that.
__________________
I love sanding.
Reply With Quote
  #57  
Old 06-14-2021, 10:04 AM
ghrocketman's Avatar
ghrocketman ghrocketman is offline
President, MAYHEM AGITATORS, Inc.
 
Join Date: Jul 2005
Location: Nunya Bizznuss, Michigan
Posts: 13,443
Default

That "Spider" ignition method is interesting.
Seems it must be easier to get good old-fashioned black-powder in my area than there.
My local gun shop stocks FF and FFF.
VERY hard to locate FFFF any longer though.
__________________
When in doubt, WHACK the GAS and DITCH the brake !!!

Yes, there is such a thing as NORMAL
, if you have to ask what is "NORMAL" , you probably aren't !

Failure may not be an OPTION, but it is ALWAYS a POSSIBILITY.
ALL systems are GO for MAYHEM, CHAOS, and HAVOC !
Reply With Quote
  #58  
Old 06-14-2021, 02:27 PM
LeeR's Avatar
LeeR LeeR is offline
Retired with Way Too Many Kits
 
Join Date: Jun 2007
Location: Colorado
Posts: 3,222
Default

Quote:
Originally Posted by TigerHawk
gh, csrocketry.com has 4F in stock I believe.


Yes. Chris has it. I bought it from him at NSL-2018, and he had it recently at NSL-2021. If you have not visited his trailer at a launch, it is pretty amazing. I typically buy motors from him if he is at a launch — especially the single slug F reloads for the 29/40-120 RMS, which require Hazmat if shipped.
__________________
Lee Reep
NAR 55948

Projects: Semroc Saturn 1B, Ken Foss Designs Mini Satellite Interceptor
In the Paint Shop: Nothing! Too cold!
Launch-Ready: Farside-X, Maxi Honest John, Super Scamp
Reply With Quote
  #59  
Old 06-14-2021, 07:31 PM
blackshire's Avatar
blackshire blackshire is offline
Master Modeler
 
Join Date: Jan 2009
Location: Fairbanks, Alaska
Posts: 6,507
Default

Quote:
Originally Posted by tbzep
IIRC, there was a brass tube one used on a Saturn 1 or 1B in a NAR mag article/pictorial. I think it was called a spider in the mag, maybe because of the 8 motors. Those are cool, but you have to build an individual spider for each cluster rocket.

A flash pan is just that. It's a flat surface with powder spread on it. It leaves soot on the back end of the rocket, but it's generic so it will work on two or twenty motor clusters. Big, tall, short, small, it works on 'em all. As for soot, even a clean ignition of several motors will soot up a rocket if you use a perpendicular blast deflector and don't stand the rocket off far enough.
The actual Soyuz uses a "spider pan," and the Russians call it that. The pan is a stylized star-shaped construction of metal tubing (probably made for only a single use due to the temperatures and exhaust plume forces involved, and thus likely made of light metal tubing, perhaps rolled sheet metal). The branching tubes' ends point upward, toward all 32 thrust chambers (twenty V-2 derived main ones, and twelve small, gimbaled ones for steering, on the four parallel-staged conical boosters and the center core sustainer), and the pan is loaded with (electrically-ignited) black powder before launch. Also:

The Russians call the Soyuz--which has another stage atop the R-7 ICBM-derived boosters/sustainer assembly--a three-stage rocket, but it is actually a boosted two-stage launch vehicle, like the old "balloon-tankage Atlas" (with separating booster engines) Atlas-Agena, Atlas-Centaur, Atlas-Burner II, etc. By itself, with no upper stages, the original Atlas--like the Soviet R-7 ICBM, which also had no upper stages--was a "1-1/2 stage" (boosted single-stage) ICBM.
__________________
Black Shire--Draft horse in human form, model rocketeer, occasional mystic, and writer, see:
http://www.lulu.com/content/paperba...an-form/8075185
http://www.lulu.com/product/cd/what...of-2%29/6122050
http://www.lulu.com/product/cd/what...of-2%29/6126511
All of my book proceeds go to the Northcote Heavy Horse Centre www.northcotehorses.com.
NAR #54895 SR
Reply With Quote
  #60  
Old 06-14-2021, 09:03 PM
LeeR's Avatar
LeeR LeeR is offline
Retired with Way Too Many Kits
 
Join Date: Jun 2007
Location: Colorado
Posts: 3,222
Default

Speaking of clusters, here is my 3x29mm UltraViolet III, lifting off the rail at NSL in Alamosa, Colorado. Powered by three F15-6 engines. Ignition from Quest Q2G2 igniters.
Attached Thumbnails
Click image for larger version

Name:  CCDA3EF2-9144-444F-A913-BE74FA1F32A4.jpeg
Views: 21
Size:  1.44 MB  
__________________
Lee Reep
NAR 55948

Projects: Semroc Saturn 1B, Ken Foss Designs Mini Satellite Interceptor
In the Paint Shop: Nothing! Too cold!
Launch-Ready: Farside-X, Maxi Honest John, Super Scamp
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 07:41 AM.


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