Model Forum / General / Rockets / April 2005

Grimly determined to figure out how to use a short-burning BP motor to
initiate
secondary deployment of a 5.5x upscale Estes Streak I was wondering whether
any data are available (google failed, alas) which correlates the volume of

Am just looken for a little bit of help with a few calculations, a formula
would be helpful.
Rocket type: Alpha
Rocket mass w/out engine: 27.30g

Building my 5.5x Estes Streak upscale for a Level-1 certification attempt
this summer has caused a curious phenomon...I find myself frequently say to
SWMBO "Its less than forty dollars".
Carbon/nomex honeycomb fin stock..."Its less than forty dollars"

Guys if you know a address here in the USA is there anyway to get it
translated online into GPS coordinates. I need the GPS coordinates to put on
a FAA waiver as the launch site is within 5 miles of a very active medium
size airport...

Has anyone seen the gas/peroxide motor in flight???
9 sec burn motor @ 5K altitude....
Any concerns in regards to launching one at YOUR launch site??
Any specific launch concerns for the RSO/LCO?

New Sky Ripper Hybrids Certified
March 29, 2005
Web posted at: 12:46 PM EST
(ROL Newswire) --  Sky Ripper Systems is pleased to announce the

Trying to achieve as much accuracy in the RockSim simulation of my 5.5x
Streak upscale as I can
could some kind soul post the thickness of the thrust ring on the Pro38
H143SS or H153 ?  Based on

This goes out to anybody who has experience with the PML Co-pilot altimeter.
I am using the co-pilot with the CPR 3000 system. I have been doing some
ground testing with the deployment and I am having a little "blow-by" from
the ejection charge around the fore & aft o-rings. Is ...

Yes, yes, yes.
Let's get it out of the way right at the beginning.  I realize that
you're supposed to use masking tape to make a 'thrust ring' at the rear
of the single-use composite motors in order to secure them into the

Last week a new "10-year Anniversary"  edition of the Ron Howard film
"Apollo 13" was released: a 2-disk set with 'digital remastering', new
features, and including the complete IMAX version.
What a rip.

Before going any farther, I'd like to personally thank Mike Jerauld of
DART for going above and beyond the call of duty in assisting me with my
Level 2 Certification flight today.  I'd also like to thank his son, who
had to postpone going off to another area while his dad was ...

I'm scratch-building my L1 certification rocket, to be launched on a
SkyRipper H155. In reading up on hybrid motors in general, it seems that
boil-off from the motor tank is a problem that affects both fill time and
(potentially) performance.

  Made a batck of simple igniters with a firestar kit just for some
Estes motors.  Used some of the Ted Pella nichrome wire and was using
some of the leftover colored Estes igniter retainers.  I actually gobbed
the pyrogen on thickly.  It makes for an impressive igniter test but

For the Apogee Medalist motors, which do folks use 'most', or what is
the ratio of S/M/L delay engines that you use/purchase?
For example, would you use 2 short delay, 3 medium delay, and 1 long
delay motor in your normal 'launching ratios'?

I have tested twice with placing a charge in the rocket, at the top of the
fin can, below the PML piston. The first test the charge was small and it
push the payload/nose cone off without moving the piston. The second test,
I used a bigger charge. The payload/nose cone went flying ...