[roc-chat] Re: Sounding Rockets and ROCstock Nikes
- From: R Dierking <applerocketry@xxxxxxxxxxx>
- To: "roc-chat@xxxxxxxxxxxxx" <roc-chat@xxxxxxxxxxxxx>
- Date: Wed, 29 Jan 2014 11:09:35 -0800
Absolutely Chris. And, of course there's lighting the sustainer at higher
altitude which could be a real challenge.
I wonder what attitude the Stratolaunch launch vehicle will be when it deploys
the rocket. I imagine two connected 747's in a very steep climb. Wow, and
how to recover after deployment? What a ride that's going to be!
This contrasts with launching a small orbital launch vehicle with a F-15 in a
steep climb. The F-15 was designed to maneuver like that and take the loads.
Anyway, I'm probably getting off topic here. :-)
To: roc-chat@xxxxxxxxxxxxx
Subject: [roc-chat] Re: Sounding Rockets and ROCstock Nikes
From: Chris.J.Kobel@xxxxxxxx
Date: Wed, 29 Jan 2014 10:58:43 -0800
Great information, Richard. I sure
appreciate learning about this stuff on the chat.
You should ask Kurt how easy it is to
program in an ignition delay for a multi-stage vehicle. Sure, it
offers great performance in the simulation, but I think it's tougher to
do in reality.
Chris
From:
R Dierking <applerocketry@xxxxxxxxxxx>
To:
"roc-chat@xxxxxxxxxxxxx"
<roc-chat@xxxxxxxxxxxxx>,
Date:
01/29/2014 10:46 AM
Subject:
[roc-chat] Re:
Sounding Rockets and ROCstock Nikes
Sent by:
roc-chat-bounce@xxxxxxxxxxxxx
Thank you Eric. Sounding rockets
are not only interesting from a historical perspective but there's some
really useful information for amateur rocketeers.
I've attached a couple graphs in a pdf taken from the Nike-Apache Performance
Handbook, December 1966. Like the Nike-Cajun, the Nike-Apache was
a two stage sounding rocket.
Graph 1 shows changes in apogee with varying Apache ignition time. In
the range 16 to 22 seconds, there's really not of difference in the apogee.
Yes, it's a curve so the difference would be more dramatic on both
ends out of this range. But, it's interesting that within this range,
you wouldn't have to fret too much about ignition delay.
But, take a look at Graph 2 that shows changes in apogee with launch altitude.
Just launching at 4,000' ASL vs. at sea level gains 100,000'. Wow!
No wonder companies such as Stratolaunch will have a significant
advantage over surface launch vehicles.
So, I wonder why we don't see more 2 stage rockets at Lucerne (and other
launches as well), that have a large booster, then small sustainer after
an appropriate coast period. Like a K to a H impulse. Sure,
it looks cool lighting the 2nd stage right after boost, but a properly
stabilized 2 stage rocket that was designed to light the sustainer after
coast to less dense atmosphere could reach the top of the high-alt waiver
at Lucerne.
From: ENHolmberg@xxxxxxx
Date: Wed, 29 Jan 2014 02:41:21 -0500
Subject: [roc-chat] Re: Sounding Rockets and ROCstock Nikes
To: roc-chat@xxxxxxxxxxxxx
nice report!
In a message dated 1/28/2014 5:19:02 P.M.
Pacific Standard Time, applerocketry@xxxxxxxxxxx writes:
First, a little reminder about the Nike
Smoke T-shirts available at http://www.customink.com/signup/590yiiv2
I'm looking forward to seeing lots of Nike Smokes and other rockets based
on the Nike booster at ROCstock.
I've been doing some reading about sounding rockets including some reports
written in the 1950's. Currently, I'm reading a report written in
July 1957 that has some interesting details about developing the Nike-Cajun
two stage sounding rocket and its capabilities. Kind of funny, but
the authors in the report noted that the Nike-Cajun without the engines
and research payload wasn't cheap at $3150. ;-)
The report gives many flight profiles based on different payload masses.
Anyway, here's a brief description of a typical flight:
Nike booster burnout occurs at 3.3 seconds and 6450' altitude. Seems
low to me, but it's hauling. The Cajun ignites at 12.3 seconds and
29,300'. OK, yeah, it coasted for awhile. The Cajun burnout
is at 15.3 seconds (a three second burn) and 41,100' moving at Mach 6.34.
Dang, and this was 1957! Here's where it gets wild. The
rocket coasts and at 198,000' the nose is ejected and it continues to coast
to 425,000' 172 seconds after launch. Wow. And, because launch
was at 85 degrees launch angle, the rocket is 94 miles downrange.
Sounding rockets are cool, and they are still being used frequently. We
don't hear a lot about them, but they're accomplishing a lot of science.
=[attachment "Graphs.pdf" deleted
by Chris J Kobel/West/Aerospace/US]
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