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My L1 Certification

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Roger Coppock

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Jun 14, 2009, 12:14:10 AM6/14/09
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I earned my L1 certification at ROCstock XXIX today. My 29 mm
diameter Blue Tube™ rocket rocketed skyward on an H128 at
about 10:20 AM on pad 19 at the ROC's Lake Lucerne launch site.
For about a minute I thought the Rocket Gods had taken it. Then,
someone found it quickly drifting away on its 18-inch yellow
parachute in the 15+ mph winds. In about a minute, it disappeared
again from sight. Fortunately, some ATV drivers recovered it about
a mile away from the pad. (Saved by a pair of bright orange return
labels!) John Wahlquist of ROC witnessed and signed. He deserves
extra credit for his patience with me.

I wonder how high I can make a "L" impulse minimum diameter go?
(I've really got to work on dual deployment and radio location.)

-.-. --.- Roger Coppock

Joe Pfeiffer

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Jun 14, 2009, 2:15:16 AM6/14/09
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Roger Coppock <rcop...@adnc.com> writes:

> I earned my L1 certification at ROCstock XXIX today.

Outstanding!

Captain

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Jun 15, 2009, 2:31:19 PM6/15/09
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On Jun 14, 12:14 am, Roger Coppock <rcopp...@adnc.com> wrote:
> I earned my L1 certification at ROCstock XXIX today.  My 29 mm
> diameter Blue Tube™ rocket rocketed skyward on an H128 at
> about 10:20 AM on pad 19 at the ROC's Lake Lucerne launch site.

Congratulations Roger!

OK, please forgive my naivety regarding HPR, having never built or
flown, but ...

BT-5 is min. dia. for 13mm; BT-20 is min. dia. for 18mm; BT-50 is min.
dia. for 24mm. What the heck is min. dia. for 29mm? From the specs,
BT-55/56 seems too big.

Joe Pfeiffer

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Jun 15, 2009, 3:17:33 PM6/15/09
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Captain <bruc...@gmail.com> writes:

You wouldn't want to use Estes tube for a high power rocket! Going to
somebody like Public Missiles Limited, it turns out they've got phenolic
airframe tubing with a 1.145" inside diameter:

https://blastzone.com/pml/

Damian Burrin

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Jun 15, 2009, 3:34:21 PM6/15/09
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>>You wouldn't want to use Estes tube for a high power >rocket! Going to
>somebody like Public Missiles Limited, it turns out >they've got phenolic
>airframe tubing with a 1.145" inside diameter:

LOC Precision do some cardboard tube thats ok for lower end L1 stuff. You
can use drain pipe. (sorry Quantum Tube) but glassed phenolic for anything
the more extreme. There is also the new Blue Tube thats become available
(http://www.rebelrocketry.com/shop/index.php?cat=c281_Blue-Tubes.html) -
It's just getting to the UK now.

Damian

Damian Burrin
UKRA 1159 Level 2 RSO

http://www.ukrocketry.com
http://www.larf-rocketry.co.uk

LARF - Putting the amateur back in rocketry!!


Dale Martin

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Jun 14, 2009, 9:25:08 PM6/14/09
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"Roger Coppock" <rcop...@adnc.com> wrote in message
news:1922693c-abe6-45dd...@k2g2000yql.googlegroups.com...

-.-. --.- Roger Coppock

Congrats and welcome aboard!


Message has been deleted

Roger Coppock

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Jun 16, 2009, 12:49:09 AM6/16/09
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On Jun 15, 11:31 am, Captain <brucew...@gmail.com> wrote:
[ . . . ]

> BT-5 is min. dia. for 13mm; BT-20 is min. dia. for 18mm; BT-50 is min.
> dia. for 24mm.  What the heck is min. dia. for 29mm?  From the specs,
> BT-55/56 seems too big.

29mm works out to BT-52 in Estes' scheme.
Yes, I have used BT-52 in a high power rocket.
There are, however, many other products better
than plain old kraft paper for high power model
rocket body tubes. They are usually made with
fiberglass and/or epoxy. Sometimes, exotic
materials, like carbon fiber, are used.

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