Yeah I know one is not to mess with motors but is it possible to twist
out a plug in an E9-P to make an E9-0 booster? A D12-0 and C6-7 combo
doesn't stick my Quest Zenith II out of sight long enough. (I made my
own first stage to use an E but found out later only a D is available.)
Works fine with a spacer. Get over 2300 feet and use a streamer for
recovery. Just did a flight this morning.
here a suggestion: do this at your own risk of course:
I would take another E9-P motor and split it down it length so that I could
see approx., how long the clay plug is ... I assume that estes has some
degree of quality control so the clay plugs should be more or less about the
same length from one motor to another .
I would then use a hand drill and slowly drill a hole down the middle of
this clay cap until I reached the BP charge....Now knowing the actual length
of the clay plug for this specific motor, I would then use a dremel to
grind out the remainder of the clay plug....
as far as NAR rules and all that: NAR rules only apply when you are on
NAR-Time...if you off by yourself, you are on "Kurt-Time"... On Kurt-Time,
Kurt can do whatever Kurt wants to .... now of course there is the nagging
question of whether or not you live in a NFPA state, blah,blah,blah....but
unless you run down and inform on yourself to the state fire marshall that
you are altering model rocket motors, I doubt he/they will ever know... much
less cite you for it....
so much for self-regulation..... don't ask and don't tell...
Splitting down the length!??? Dremeling the plug??? aargh, no way!!!
At most if I wanted to see how deep the clay is, I'd peel the casing off the
The clay is relatively soft. Just use a sharpened wood dowel to break up the
clay. A dremel is overkill, and is a potential spark/heat source.
I'd like to see a video of the "splitting it down the length and dremeling
the plug", but why does it seem the video camera might be damaged sometime
during the process? I sure wouldn't be anywhere in the area when the
splitting/dremeliing was occurring!
Yeah I know against the rules and all that. I actually was
considering using a twist drill and turning it slowing with my hand to
scrape out the clay. I didn't know it was a clay plug. No way in heck
do I feel invincible and would never split a motor in two. Again just
curious and wonder if anyone knew how thick the plug was.
Don't know why that stopped making the E9-0.
There's a very good explanation.... The E9 thrust profile is VERY gentle,
great for lightweight and/or long stable rockets, but it's lousy for use
as a booster stage, when the object is to get the stack up to speed
quickly (for stability reasons). If your first stage is slow off the pad,
it's likely to arc over to a substantial degree; by time the second stage
ignites your rocket may be well off a vertical flight profile.
Thanks. My Quest Zenith II is pretty lightweight actually and that
is probably why I get some cool out of sight flights with the D12/C6 combo.
I did a second flight yesterday and a month ago, when I flew it, I
didn't appreciate the staging. Yesterday I thought I had a staging
failure but wham, the sustainer lite off.
The certified it, but never actually released or sold them. For some reason
it just didn't work. Don't know if it was the too low initial thrust
problem, or they didn't stage, or they behaved like the old E15s :-)
Bob Kaplow NAR # 18L >>> To reply, there's no internet on Mars (yet)! <<<
Kaplow Klips & Baffle: http://nira-rocketry.org/Document/MayJun00.pdf
Did they ever say "they just didn't work"? Or did they just decide not
to sell them since the average American consumer would stupidly attempt
to use them as a booster motor for a model that weighed too much for an
E9-0 to lift safely?
There *were* reports that folks could not get the C11-0 to ignite upper
stages. I have had 100% success with them. Of course, I tape my
multi-stage motors end to end using cellophane tape.
-Fred Shecter NAR 20117
Geez, guys, grab a sharp pocket knife and carve away at the plug. This isn't
a big freaken deal. NAR no-no for sanctioned events but hey, this is no
more dangerous that assembling your own AT reload. Be gentle, and you won't
have aq problem. No power tools though.
The clay plug is usually no thicker than 3/16" and can easily be
scraped out with a dowel, pick, screwdriver or knife. The propellant
grain itself is as hard as concrete, and you will know when you've
reached it. It is not easily damaged (unless you really whack at it).
Don't even think of using power tools. The friction produced will heat
up the grain.
That said, you should just go buy some real E9-0's and save yourself
the trouble and possible danger.
I dont know about, "unplugging" the motor, but be careful where you fly it.
modifying a motor is against NAR Rules and no RSO worth his salt would let
you use it. However at a non sanctioned launch it doesnt matter;)
Why not just CHAD-stage a D12-0 to the first stage's D12-0?
Safe, reliable, no violations of any safety codes, fully approved
of by all major religious denominations, and wholesome as
p.s. ignore shockie, anyone who would recommend using
a dremel on a live motor to grind out a clay plug (which is
crumbly and can be picked out easily with a wood dowel
anyway) doesn't have all his marbles.
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