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Old 03-04-2015, 11:36 PM
luke strawwalker's Avatar
luke strawwalker luke strawwalker is offline
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Default Study Summary: Four Stage Solid Propellant Sounding Rocket

Here's some snips from a study I was going to summarize but there wasn't really that much to summarize... mainly charts-n-graphs and stuff...

Here's some interesting pic snips from the study, however, that might prove useful to someone wanting to build a model of this four stage sounding rocket...

Later! OL JR
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Old 03-07-2015, 06:30 AM
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If it's still there (it was in the cover photo of 1970s-vintage Wallops Flight Center [before it became Wallops Flight Facility] Visitor Center booklets), one of these rockets--or one similar in appearance to it (it might have had an M31 Honest John first stage instead, possibly with Nike second and third stages) is on display there, in a raised position on a "tubular boom" or rail launcher. Also:

The rocket shown above appears to be like the Argo D8 Journeyman, having a Sergeant first stage (with two Recruit boosters), two Lance (or maybe Skat?) stages, and a Recruit fourth stage. (The Journeyman had an X-248 fourth stage, which was also the final stage of the Vanguard, Scout, Shotput, Argo D4 Javelin, and early Thor-Delta vehicles). This vehicle's first stage might possibly have been a Castor, or an Aerojet Junior (this was the Astrobee 1500's first stage), as both of these motors were derived from the Sergeant. Similarly, the 9" diameter fourth stage might have been a Tomahawk motor, but I think--based on the apparent age of the photo (1961, I think)--that this rocket pre-dated the Castor, Aerojet Junior, and Tomahawk motors (at least in *NASA* usage, as the USAF used the Astrobee 1500 in 1961). In addition:

For scale models of rockets like this, which have conical flare-stabilized upper stages (the Aerobee 300 & 300A and the Black Brant IV are other examples--the flare also serves as a high-altitude nozzle extension for improved performance in a vacuum), a simple but little-known ducted rocket technique (which was developed to stabilize finless scale models, even those without conical flares) would give such scale upper stages realistic, wide exhaust plumes (and extra thrust as well, without "toasting" the conical flare). Below is a link to the article: "Finless Rockets Using Engine-Driven Gas-Dynamic Stabilization" by M. Dean Black (Apogee Components Peak of Flight newsletter, Issue #379, December 2, 2014): http://www.apogeerockets.com/educat...wsletter379.pdf . Black's methods, since they mix the motor exhaust with entrained air from the outside, create a cooler, slower-moving exhaust plume of greater mass (not unlike what a turbofan engine does), which also increases the total thrust somewhat.
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Last edited by blackshire : 03-07-2015 at 07:18 AM.
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