Ye Olde Rocket Forum

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


Reply
 
Thread Tools Search this Thread Display Modes
  #111  
Old 04-18-2018, 11:50 PM
BEC's Avatar
BEC BEC is offline
Master Modeler
 
Join Date: Feb 2009
Location: Auburn, Washington
Posts: 2,191
Default

Well, as I say, given the market for "regular" 18mm motors, hopefully they won't have this issue.

I have more than once thought of building another Nova Paylaoder with a stage coupler or two inside above the motor mount to "harden" it a bit against the effects of the D10.

I was also going to add to my previous post that I once flew a BMS School Rocket with a payload section to over 2000 feet on a D10. This was at an Oregon Rocketry launch held at the Tillamook, Oregon airport (!). I would not have found it myself, but others in the group managed to direct me to it, so I did get it back.
__________________
Bernard Cawley
NAR 89040 L1
SAM 0061
AMA 42160
KG7AIE
Reply With Quote
  #112  
Old 04-19-2018, 12:10 AM
blackshire's Avatar
blackshire blackshire is offline
Master Modeler
 
Join Date: Jan 2009
Location: Fairbanks, Alaska
Posts: 5,458
Default

Quote:
Originally Posted by BEC
Well, as I say, given the market for "regular" 18mm motors, hopefully they won't have this issue.

I have more than once thought of building another Nova Paylaoder with a stage coupler or two inside above the motor mount to "harden" it a bit against the effects of the D10.

I was also going to add to my previous post that I once flew a BMS School Rocket with a payload section to over 2000 feet on a D10. This was at an Oregon Rocketry launch held at the Tillamook, Oregon airport (!). I would not have found it myself, but others in the group managed to direct me to it, so I did get it back.
The D10 seems to be a "tortoise motor" rather than a "hare motor" (like the D21), in that instead of reaching top speed immediately and then wasting much of its energy against air friction, the D10-powered BMS school rocket more gradually accelerated to its maximum velocity (slower than it would have gone on a D21, I suspect), gaining a good deal of altitude in the process, then coasted higher overall because it generated less drag. Also:

Be glad it wasn't one of your Super Flea-like, break-away drag recovery models from the Estes plans book (a BT-20 or ST-7 size, 18 mm motor-powered up-scaled Super Flea might be interesting...), or no one might have spotted it! :-) I agree--those "stone-ized" 'fish paper' stage couplers provide good protection from burning ejection charge particles and 'heat soak' (my Astron Mark II's stage coupler/engine block ["thrust ring," in 'Quest-speak'] showed almost no wear even after numerous flights).
__________________
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
  #113  
Old 04-19-2018, 10:56 AM
Gus's Avatar
Gus Gus is online now
7/21/61
 
Join Date: Sep 2005
Location: North of Detroit
Posts: 1,759
Default

Quote:
Originally Posted by ghrocketman
Why would anyone use a D10 or D21 in anything BT-20 or 50 based rocket unless it is a fire-and-forget flight ? Not likely to get it back unless the field is huge.


GH,

A "kid" I know and her dad have both used the D10 to great effect in minimum diameter tubes for altitude record attempts.

But in 18 mm tubes they usually destroy the tube after a single flight. I wouldn't fly them in anything painted.

I DO find the D21 a great motor for the Semroc Mars Lander.

Last edited by Gus : 04-19-2018 at 11:51 AM.
Reply With Quote
  #114  
Old 04-19-2018, 11:08 AM
ghrocketman's Avatar
ghrocketman ghrocketman is offline
President, MAYHEM AGITATORS, Inc.
 
Join Date: Jul 2005
Location: Michigan
Posts: 8,377
Default

Gus-
I can see that D10 being put to great use for that purpose ! I can imagine who the "kid" and parent are....
__________________
When in doubt, WHACK the GAS and NEVER touch the brake !!!
No Harm=NO Foul advocate

No MAYHEM/FIASCO/CHAOS/HAVOC/DANGER =NO FUN !

Yes, there is such a thing as NORMAL
, if you have to ask, you probably aren't
!
Reply With Quote
  #115  
Old 04-19-2018, 11:44 AM
BEC's Avatar
BEC BEC is offline
Master Modeler
 
Join Date: Feb 2009
Location: Auburn, Washington
Posts: 2,191
Default

....I probably can, too....
__________________
Bernard Cawley
NAR 89040 L1
SAM 0061
AMA 42160
KG7AIE
Reply With Quote
  #116  
Old 04-19-2018, 01:06 PM
Jerry Irvine's Avatar
Jerry Irvine Jerry Irvine is offline
Freeform rocketry advocate.
 
Join Date: Jan 2008
Location: Claremont, CA "The intellectual capitol of the world."-WSJ
Posts: 3,362
Default Kits suitable for the new motors

Attached Thumbnails
Click image for larger version

Name:  stripper2.jpg
Views: 10
Size:  6.9 KB  
__________________
Exemptions not regulations. Please support DOT treating slow burning solids as not subject to HMR. 2015 NAR President declines!
U.S. Rockets instaship. http://bit.ly/1aca7mA Please buy some rockets.
The O administration believed in tax, spend, borrow, fine, mandate, monologue. D voters will soon be very happy with the election outcome!
Model rocketry is as safe as safe can be defined in human existence. Bow and pray: GH Stine, Orville, Vern, Lee, Lonnie, Carl, etc. No, really.

Last edited by Jerry Irvine : 04-19-2018 at 01:25 PM.
Reply With Quote
  #117  
Old 04-19-2018, 02:52 PM
Royatl's Avatar
Royatl Royatl is offline
SPEV/Orion wrangler
 
Join Date: Mar 2005
Location: Atlanta, GA
Posts: 2,200
Default

Quote:
Originally Posted by Gus
GH,

A "kid" I know and her dad have both used the D10 to great effect in minimum diameter tubes for altitude record attempts.

But in 18 mm tubes they usually destroy the tube after a single flight. I wouldn't fly them in anything painted.

I DO find the D21 a great motor for the Semroc Mars Lander.


I've flown a Discount Rocketry Tube-Oh with a D21, TWICE and gotten it back. There was a little discoloration on the tube following the second flight.

I've flown one of the Estes E2X rockets on D21, TWICE! and gotten it back (though the first time was a bit dicey... it just managed to find the side of a road in a forest next to the launch site. Just dropped right in between two large stands of trees.). I expected the motor mount to melt a little, but it survived nicely.
__________________
Roy
nar12605
Reply With Quote
  #118  
Old 04-20-2018, 09:22 AM
tbzep's Avatar
tbzep tbzep is offline
Dazed and Confused
 
Join Date: Mar 2005
Location: TN
Posts: 8,377
Default

I've had good luck rolling up a sheet of cardstock and inserting it down the body tube to protect them from charring with some of the little 22mm EX motors we played with. YMMV. Those little 22mm F motors were bullets!

We didn't use coupler tubes because of the recovery systems and they would have been hard to remove after getting roasted too. They wouldn't last but a few flights anyway, so it's not a permanent solution.
__________________
I love sanding.
Reply With Quote
  #119  
Old 04-20-2018, 11:57 AM
BARGeezer BARGeezer is offline
Avid Builder
 
Join Date: Nov 2017
Posts: 53
Default

Hmmm... I'm wondering if Nomex paper would work better than cardstock or coupler tubes:

http://www.erockets.biz/semroc-nome...d-sem-nom-2436/

Possibly a longer lasting solution? Worth further exploration.
Reply With Quote
  #120  
Old 04-20-2018, 02:31 PM
ghrocketman's Avatar
ghrocketman ghrocketman is offline
President, MAYHEM AGITATORS, Inc.
 
Join Date: Jul 2005
Location: Michigan
Posts: 8,377
Default

I doubt thin nomex paper would be better than a thick fish paper stage coupler for burn-thru protection.
__________________
When in doubt, WHACK the GAS and NEVER touch the brake !!!
No Harm=NO Foul advocate

No MAYHEM/FIASCO/CHAOS/HAVOC/DANGER =NO FUN !

Yes, there is such a thing as NORMAL
, if you have to ask, you probably aren't
!
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 11:31 PM.


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