Ye Olde Rocket Forum

Go Back   Ye Olde Rocket Forum > The Golden Age of Model Rocketry > Model Rocket History
User Name
Password
Auctions Register FAQ Members List Calendar Today's Posts Search Mark Forums Read


Reply
 
Thread Tools Search this Thread Display Modes
  #21  
Old 02-04-2017, 06:42 PM
Woody's Workshop Woody's Workshop is offline
Craftsman
 
Join Date: Mar 2012
Location: Reed City, Michigan
Posts: 217
Default

So the very first Alpha used a BT-50 9" long?
The only one's I've seen (or built) were BT-20.
I'll have to scratch build one soon of a BT-50 version.
Do you have a part number or a BNC number?
Reply With Quote
  #22  
Old 02-04-2017, 07:03 PM
al_packer al_packer is offline
Old Fogey
 
Join Date: Sep 2005
Posts: 57
Default

Quote:
Originally Posted by Woody's Workshop
So the very first Alpha used a BT-50 9" long?
The only one's I've seen (or built) were BT-20.
I'll have to scratch build one soon of a BT-50 version.
Do you have a part number or a BNC number?


BT-50 was 0.950 I.D., 0.976" O.D., at least up until I departed in 1977. That just happened to be the size of a stock mandrel that Euclid Spiral Paper Tube Company had. The nose cone was a BNC-50K.
Reply With Quote
  #23  
Old 02-04-2017, 08:28 PM
vcp vcp is offline
Intermediate Rocketeer
 
Join Date: Mar 2011
Posts: 31
Default

I have an Alpha, in pristine condition, flown once, that is 47 years old.
Reply With Quote
  #24  
Old 02-04-2017, 08:35 PM
stefanj stefanj is offline
Master Modeler
 
Join Date: Mar 2005
Location: Hillsboro, OR
Posts: 2,494
Default

Quote:
P.S. My favorite science fiction book: "The Stars my Destination" by Alfred Bester. It would make a great movie if someone like Tim Burton took on the project.



"Gully Foyle is my name
Terra is my nation
Deep space is my dwelling place
The stars my destination."

I had the pleasure of meeting Bester, at a SF convention in 1980. I feel very proud to have gotten a laugh out of him.
__________________
NAR #27085 - Oregon Rocketry - SAM
Reply With Quote
  #25  
Old 02-04-2017, 08:42 PM
tbzep's Avatar
tbzep tbzep is offline
Dazed and Confused
 
Join Date: Mar 2005
Location: TN
Posts: 8,449
Default

Quote:
Originally Posted by Woody's Workshop
So the very first Alpha used a BT-50 9" long?
The only one's I've seen (or built) were BT-20.
I'll have to scratch build one soon of a BT-50 version.
Do you have a part number or a BNC number?

All the Alphas, Alpha III's and Alpha IV's are BT-50. You're just getting the numbers mixed up a little. BT-20 is the size for 18mm motor mounts (1/2A - C)
__________________
I love sanding.
Reply With Quote
  #26  
Old 02-04-2017, 08:44 PM
dwmzmm's Avatar
dwmzmm dwmzmm is offline
Master Modeler
 
Join Date: Apr 2005
Location: Katy, TX
Posts: 2,288
Default

I just remembered my dad took a slide picture of my very first model rocket launch, that of the Astron Alpha along with the red Electro Launch pad. This was at the CW Ruckel Jr. High School in Niceville, FL (summer of 1969). Engine used was the 1/2 A6-2; I failed to use enough recovery wadding as the parachute was mostly melted. Before launch, my mom was so scared of the engine "blowing up" that she locked herself in the car.
Attached Thumbnails
Click image for larger version

Name:  img428.jpg
Views: 86
Size:  20.2 KB  
__________________
Dave, NAR # 21853 SR.
Section Advisor
Old Rocketeers # 724
Reply With Quote
  #27  
Old 02-04-2017, 09:52 PM
Woody's Workshop Woody's Workshop is offline
Craftsman
 
Join Date: Mar 2012
Location: Reed City, Michigan
Posts: 217
Default

Quote:
Originally Posted by tbzep
All the Alphas, Alpha III's and Alpha IV's are BT-50. You're just getting the numbers mixed up a little. BT-20 is the size for 18mm motor mounts (1/2A - C)


You are correct.
I must be tired.
Reply With Quote
  #28  
Old 02-04-2017, 10:47 PM
BEC's Avatar
BEC BEC is offline
Master Modeler
 
Join Date: Feb 2009
Location: Auburn, Washington
Posts: 2,237
Default

Quote:
Originally Posted by al_packer
Let's start with (3), because that's where the design started. I free-handed that shape on the nose cone lathe in Vern's garage, probably a year earlier, just making a shape that I liked. Then when the call for a new beginner's model came down, I picked the nose cone up off my kitchen table, grabbed an 18" length of BT50, and (1) cut it in half (shipping considerations for the final kit limited me to 9"). and stuck the nose cont on one end. The fins (2); well, I wanted the CP back fairly far for max stability, so a swept design was the logical choice. Straight tips meant the fin would be easier for the builder to cut from the balsa sheet, and the taper was for appearance and structural considerations. I drew a shape, then changed it to get the look I wanted and poof--I had something Vern would like.


Interesting about the nose cone. The BNC-50K was already in use on the X-Ray, Farside (not X), Cobra and Drifter....or was that the already-in-stock nose cone that was closest to your free-handed one when you started looking at actually producing it?

I've located the instruction sheet from my first Alpha kit....but of course the SP-25 is long gone.
__________________
Bernard Cawley
NAR 89040 L1
SAM 0061
AMA 42160
KG7AIE
Reply With Quote
  #29  
Old 02-04-2017, 10:54 PM
BEC's Avatar
BEC BEC is offline
Master Modeler
 
Join Date: Feb 2009
Location: Auburn, Washington
Posts: 2,237
Default

Quote:
Originally Posted by al_packer
BT-50 was 0.950 I.D., 0.976" O.D., at least up until I departed in 1977. That just happened to be the size of a stock mandrel that Euclid Spiral Paper Tube Company had. The nose cone was a BNC-50K.


So just like the story GHS recounts in a couple of his writings of a stock firework tube setting the diameter of the most common model rocket motor (18mm), a stock mandrel drove the size of the next common size up (24mm) since the Estes "Mighty D" had to fit in BT-50, and I surmise (but don't know) that all the follow one motors (Estes Es and C11s, and 24mm composites) are all that diameter to be compatible.

I love how this stuff all connects together.
__________________
Bernard Cawley
NAR 89040 L1
SAM 0061
AMA 42160
KG7AIE
Reply With Quote
  #30  
Old 02-04-2017, 11:10 PM
Ltvscout's Avatar
Ltvscout Ltvscout is online now
Ye Olde Rocket Shoppe
 
Join Date: Jun 2004
Location: Milwaukee, WI
Posts: 5,359
Default

Quote:
Originally Posted by al_packer
Thanks, guys and/or gals for posting your Alpha memories.

Thanks for stopping by, Bill, and enlightening us with the background of the Alpha.
__________________
Scott D. Hansen
Ye Olde Rocket Shoppe - Your One Stop BAR Shoppe!
Ye Olde Rocket Plans - OOP Rocket Plans From 38 Companies!
Ye Olde Rocket Forum
Ye Olde Rocket Auction
WOOSH NAR Section #558
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 08:56 AM.


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