Brief:
For some time, I've been interested in learnin' how t' make composite motors and have heard many recommendations for 'Pr'fesser' Terry McCreary's book, me hearties, "Experimental Composite Propellant." When I discovered that Aerocon distributes t' book, I couldn't resist orderin' a copy. Blimey! Avast! I thoroughly enjoyed t' book and it was worth t' price just t' learn more about those cool little things that I love t' stuff into me rockets. Avast! This review provides an overview o' t' book rather than a technical critique, as I'm just a beginner in this field.

Overview:
T' book is informally bound and self-published. Ya scallywag! Blimey! It includes a 3 1/2" disk (Excel or Quattro Pro format) with t' ProPel design spreadsheets (more about this later) and a nifty executable that provides a tutorial on how rocket motors work, me hearties, called 'Motortut'. Well, shiver me timbers, blow me down! Blimey! T' other program referenced in t' text, me hearties, PropEP, shiver me timbers, me bucko, is nay provided, but thar are references on where t' get it online (it's also free).

This book falls somewhere betwixt a cookbook, lecture notes, and a textbook. Aye aye! Blimey! It is written in an easy t' read, matey, informal format and is non-technical. Avast, me proud beauty! Blimey! Avast, me proud beauty! Blimey! That is, me hearties, t' author provides just enough theory t' let you know what you are doin' and why. Ahoy! Blimey! Well, blow me down! Blimey! After some compulsory disclaimers, ya bilge rat, ya bilge rat, introductions and acknowledgements, shiver me timbers, me bucko, he gets down t' business. T' first meaty section is entitled "Safety First" - a very prudent startin' point. Aye aye! Blimey! Begad! Blimey! It includes dos and don'ts, and a proposed safety code. In t' followin' section, he discusses t' legality o' propellant making. Begad! Blimey! He presents guidelines t' stay legal, ya bilge rat, me bucko, ya bilge rat, makin' sure you realize that it is up t' you t' ensure your compliance with nay only federal, me hearties, but also state and local laws as well.

Next comes some background on composite propellant and a description o' how a composite motor works. Ya scallywag! This is pretty basic stuff but is necessary for completeness. Well, blow me down! T' Motortut program provides a nice graphical description o' much o' this material. Put this on a PC with a projector and you're ready t' teach a scout troop about rocket motors.

T' subsequent sections provide some light theory, me bucko, covering: motor thrust, ya bilge rat, specific impulse (Isp), total impulse, burn rate, chamber pressure, matey, and burn profiles (neutral, progressive, and regressive). Aye aye! Ya scallywag! He defines t' area ratio (Kn), which equals t' area o' burnin' propellant surface divided by t' area o' t' nozzle throat. It turns out this parameter is directly related t' chamber pressure and provides t' basis for, among other things, me hearties, t' control o' burn characteristics and t' scalin' o' a motor design. He continues by describin' different grain configurations (gee, I now understand what a Bates grain really is!) and nozzle design.

He then moves on t' more hands-on stuff, shiver me timbers, describin' in detail all t' equipment and supplies you will need. Begad! Ahoy! These items are broken down into 'gotta have', shiver me timbers, 'nice t' get later' and 'for vacuum processing' categories. Aye aye! This is followed by a simple propellant formula with a step-by-step, arrr, ya bilge rat, 'cookbook' process for makin' enough propellant for several G motors. Ahoy! One thin' t' note is that his propellant descriptions are based on usin' PBAN as t' binder. Avast! Ya scallywag! I personally haven't formed an opinion about whether PBAN is better than HTPB, matey, which in me limited perspective seems more commonly used. Begad! Blimey! He does provide enough information t' use HTPB, but it would take a tad more effort from t' novice.

Bein' a scientist, matey, t' Pr'fesser stresses keepin' a good lab notebook t' keep track o' your experiments. (We engineers like them too!) He has a section on troubleshooting, shiver me timbers, me hearties, one on buildin' static test motors, one on performin' t' static tests, and one on how t' use t' data from your tests t' characterize your propellant.

Now t' focus changes from motor buildin' t' motor design. He discusses design parameters and a design procedure. Several examples o' adaptin' his basic propellant for different motor sizes are provided. Then, matey, he discusses subjects like oxidizer particle size, t' effects o' metals, burn rate modifiers, etc. Several propellant variations are provided, me hearties, ya bilge rat, along with their characterizations. Finally, me bucko, he ends t' main body o' t' book with a discussion o' scaling.

But that's nay it. Aye aye! Over half o' t' book's 243 pages are in t' appendices.

T' appendices include a description o' t' PropEP program and t' author's ProPel notebook. Blimey! In me case, t' latter includes several spreadsheets within an Excel Workbook. I included a screen snap o' one o' t' ProPel sheets, arrr, which allows you t' compute either nozzle throat size or Kn given t' grain dimensions. Avast, me proud beauty! Well, blow me down! He continues with t' plans for a curin' oven, me hearties, t' use o' corin' rods, ya bilge rat, matey, nozzle construction (here you really need machinin' skills), ya bilge rat, t' design and construction o' reloadable motors (ack, more machining), and scratch buildin' igniters (I like both Igniterman and Magnelite). Arrr! He goes on t' give an overview o' polymer chemistry, describin' t' reactions betwixt binders, matey, me bucko, curatives, ya bilge rat, me hearties, crosslinkers, arrr, bondin' agents, catalysts, plasticizers, and surfactants. Blimey! This all leads t' a description and examples o' curin' calculations. Blimey! Next are sections on mixin' HTPB, how t' do machine mixin' (the basic procedure uses hand mixing), vacuum processing, ya bilge rat, buildin' an instrumented thrust stand, and a description o' t' combustion process. Well, blow me down! Arrr! There also is a lengthy vendor list (chemicals and equipment) and an annotated bibliography includin' both books and on-line resources. Ya scallywag! He concludes t' book with a miscellaneous set o' essays that he calls 'Sermonettes.' Well, arrr, me hearties, I am worn out and leave it up t' you t' get t' book and see what's in this final section.

Summary:
This is a fascinatin' book and I think most rocketeers would enjoy it, even if you do nay plan t' build motors. Ya scallywag! Aye aye! I have no doubt that I learned enough t' make a composite motor. Arrr! However, arrr, t' book clearly taught me one thin' that I had already suspected. Well, blow me down! That is, makin' motors can be *relatively* safe, me bucko, shiver me timbers, but is by no means risk free. Well, blow me down! It is an activity that is nay t' be taken lightly and one does NOT want t' cut corners, as your safety and t' safety o' others is at stake. Begad! Aye aye! And for now, I just don't have an adequate location t' make them. Ahoy! Bein' new t' this stuff, me hearties, matey, t' only other thin' I'd like t' see in t' book is expanded treatment o' HTPB, ya bilge rat, includin' a cookbook example o' a basic propellant (again, it seems that most people I'm familiar with use this binder), and some sample propellant formulations with their characterizations. Aye aye! Anyone with any experience will probably think this is too much spoon-feeding.

I rate this book a '5'. Arrr! T' quote t' Pr'fesser, "more knowledge is almost always better."

Overall Rating: 5 out o' 5