Ye Olde Rocket Forum

Go Back   Ye Olde Rocket Forum > The Doctor is In! > Ask the Doctor
User Name
Password
Auctions Register FAQ Members List Calendar Today's Posts Search Mark Forums Read


Reply
 
Thread Tools Search this Thread Display Modes
  #1  
Old 09-20-2014, 09:08 AM
Newbomb Turk's Avatar
Newbomb Turk Newbomb Turk is offline
Consigliere to Bill E.'s BP Mafia
 
Join Date: Oct 2012
Location: Florida
Posts: 581
Default Questions - I got'em!

1) Have I boofed my A-20 Demon clone? In my desire to have room in the body tube for the chute and plenty of shock cord, I wanted to push my Semroc baffle well into the tube. Now I'm thinking it might be too close to the engine mount. Does it damage the baffle or prevent it from functioning properly if it's too close to the engine mount?
2) Midway through a Maxi-Icarus clone build. Is there a common current rocket with a five inch BT-60 PST, like the Loadstar I or II? Or should I just bite the bullet and pay for 600 PSTs in the Estes payload pack?
3) Finally, does anyone have a good scan of the fin pattern for the Sky Raider?

Thanks all!
__________________
Just completed: Estes Cherokee-E, Estes Multi-Roc.

Current project: Painting the roll pattern on my new Ventris build, gifted me by the estimable Dr. Houchin.
Reply With Quote
  #2  
Old 09-20-2014, 09:14 AM
tbzep's Avatar
tbzep tbzep is offline
Dazed and Confused
 
Join Date: Mar 2005
Location: TN
Posts: 11,610
Default

A baffle will burn out a little quicker down close to the motor. If you plan on it being your "go to" bird that flies each and every time you go to the field and you fly often, it will eventually burn it out. If you only fly it a few times a year, you will lose it to a tree or a cato long before you burn it out.

I used fluorescent light bulb safety tubes for my payload section on the Maxi-Icarus.
The number on my tube is 404329, made by Lithonia.
http://www.homedepot.com/p/Lithonia...4-R24/100173390
__________________
I love sanding.
Reply With Quote
  #3  
Old 09-20-2014, 09:16 AM
Newbomb Turk's Avatar
Newbomb Turk Newbomb Turk is offline
Consigliere to Bill E.'s BP Mafia
 
Join Date: Oct 2012
Location: Florida
Posts: 581
Default

Thanks, Zep! Fast and quality answer. I will moderate the number of flights to lengthen the life span.
__________________
Just completed: Estes Cherokee-E, Estes Multi-Roc.

Current project: Painting the roll pattern on my new Ventris build, gifted me by the estimable Dr. Houchin.
Reply With Quote
  #4  
Old 09-20-2014, 09:23 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 Newbomb Turk
Thanks, Zep! Fast and quality answer. I will moderate the number of flights to lengthen the life span.


I edited my post to answer your second question a little better.
__________________
I love sanding.
Reply With Quote
  #5  
Old 09-20-2014, 03:15 PM
Rich Holmes's Avatar
Rich Holmes Rich Holmes is offline
Born Late Rocketeer
 
Join Date: Jul 2013
Location: Syracuse, NY
Posts: 568
Default

Pushing the baffle back also affects the center of gravity in the not so good direction, of course. But probably not catastrophically, and you presumably know enough to check.
__________________
Rich Holmes
Camillus, NY
Secretary / newsletter editor
Syracuse Rocket Club

http://richsrockets.wordpress.com
Reply With Quote
  #6  
Old 09-20-2014, 03:23 PM
Rich Holmes's Avatar
Rich Holmes Rich Holmes is offline
Born Late Rocketeer
 
Join Date: Jul 2013
Location: Syracuse, NY
Posts: 568
Default

Loadstar II does indeed have a 5" BT-60 clear plastic payload section. The RTF Loadstar does not (payload section isn't clear). Then again, Estes sells the Loadstar II for $21 versus $18 for the clear payload section assortment.
__________________
Rich Holmes
Camillus, NY
Secretary / newsletter editor
Syracuse Rocket Club

http://richsrockets.wordpress.com
Reply With Quote
  #7  
Old 09-20-2014, 09:16 PM
tbzep's Avatar
tbzep tbzep is offline
Dazed and Confused
 
Join Date: Mar 2005
Location: TN
Posts: 11,610
Default

Quote:
Originally Posted by Rich Holmes
Loadstar II does indeed have a 5" BT-60 clear plastic payload section. The RTF Loadstar does not (payload section isn't clear). Then again, Estes sells the Loadstar II for $21 versus $18 for the clear payload section assortment.

The 4 ft long clear tube that I noted in post #2 is $3.47.


.
__________________
I love sanding.
Reply With Quote
  #8  
Old 09-20-2014, 09:36 PM
jbuscaglia jbuscaglia is offline
Rusty-eyed Missile Man
 
Join Date: May 2007
Location: Hudson, MA
Posts: 175
Default

I'll second the fluorescent light tube. I use some to convert a damaged Semroc Goliath into a night flier. The Goliath uses ST-16 tube, which is a couple of thousandths of an inch larger than a BT-60, and it only took a bit of masking tape to make a snug friction fit.
__________________
John Buscaglia
NAR 27366
SAM 63
CMASS Member
Reply With Quote
  #9  
Old 09-21-2014, 08:45 AM
astronwolf's Avatar
astronwolf astronwolf is offline
Lost his Drifter
 
Join Date: Mar 2013
Location: Northeast Ohio
Posts: 1,277
Default

Quote:
Originally Posted by Newbomb Turk
3) Finally, does anyone have a good scan of the fin pattern for the Sky Raider?

There are the JimZ archive plans: http://www.spacemodeling.org/jimz/est1290.htm

If you don't like those, I might be able to come up with something better. But IMHO, the patterns on JimZ are good to go.
__________________
-Wolfram v. Kiparski
NAR 28643 - TRA 15520
MTMA Section #606 President
Reply With Quote
  #10  
Old 09-21-2014, 05:51 PM
Newbomb Turk's Avatar
Newbomb Turk Newbomb Turk is offline
Consigliere to Bill E.'s BP Mafia
 
Join Date: Oct 2012
Location: Florida
Posts: 581
Default

Thanks, all! And Wolf, that scans works perfectly. Now.
I had to uncheck "Fit picture to screen" to get the proper scale, but now I'm very happy.

As to the center of gravity, the baffle is BT-55, and the Demon is fairly nose-heavy anyway so I agree that any problems should not be catastrophic.
__________________
Just completed: Estes Cherokee-E, Estes Multi-Roc.

Current project: Painting the roll pattern on my new Ventris build, gifted me by the estimable Dr. Houchin.
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 03:07 PM.


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