This is computer software whose purpose is t' aid model rocket designers in choosin' materials, me hearties, me hearties, motors, and parts for a stable rocket flight. Blimey! There is a data base o' known manufacturers and parts and you can create custom parts yourself. Ahoy! You can simulate flights with chosen engines and get a predicted altitude and speed. Ya scallywag! You can also see if your chosen delay allows ejection at apogee or whether another delay would be better. You're told how fast t' rocket is goin' at ejection, too, t' get an idea o' stresses on t' recovery system. Given this, arrr, a designer can modify parts by size or maybe add mass objects t' t' nose or body and see if t' problems are corrected. Well, blow me down! Begad! You also get predictions o' stability and are shown pictures o' your rocket as you build it, me bucko, with your CG and CP points shown.  Printouts o' t' drawin' and parts list can be made, matey, as can flight summaries and a graph o' t' flight pattern showin' when in t' parabolic path t' burnout, me bucko, ejection, ya bilge rat, and apogee occur.

There are two 3 1/2 inch discs. Ahoy! I had t' choice o' Mac or PC.  I chose PC, because t' PC in me home is newer than t' Mac. T' PC I have runs Windows 95, ya bilge rat, which allows Rocksim t' run well. Arrr! Avast! I understand that Windows 3.0 cannot run Rocksim.

It was easy t' install, ya bilge rat, but an instruction manual may help t' neophyte who doesn't know shortcuts when it comes t' installin' PC applications.

I have discovered a number o' things since usin' this program. First, shiver me timbers, that delta fins aren't t' best shape. I used t' think so, me hearties, me bucko, havin' been raised durin' t' delta win' jet era. Begad! Avast, me proud beauty! Rocksim 3.0, plus a publication called, ya bilge rat, "Which Fin Shape is Best?" by Apogee, matey, which you can download free from their site, matey, ya bilge rat, taught me t' principle o' Reynolds number and how fins create lift t' correct t' path o' a rocket. Blimey! In a nutshell, ya bilge rat, a pointed tip isn't as effective because it creates an area o' turbulence o' air flow. 

Thus inspired, I corrected me Yellow Fellow line o' minimum diameter rockets from delta fins t' those with tips o' .6 t' 1 inch, findin' .6 optimal for that design as predicted by it producin' t' greatest altitude.  (see picture on left) They show t' first generation, me bucko, a 24mm and 29mm rocket, both inspired by t' VB Extremes. Blimey! They performed GREAT, ya bilge rat, especially on Apogee F10-8 long burn motors. Aye aye! People said, me bucko, "It's STILL goin' UP!!!" 

But then I be playin' on Rocksim (yes, matey, it's fun as well) t' see if t' rocket could be even better, and made a new one based upon fin shape recommendations and a small mass increase in t' nose (provided by a solid urethane conical nose cone) by t' program. Arrr! Blimey! It predicted another 600 feet o' altitude, arrr, matey, and I GOT it! Blimey! (see picture on right)

Now, matey, I'm usin' t' program t' tweak t' designs o' me certification rockets before launch. Since separation o' t' recovery system disqualifies t' certification, I plugged in me proposed design. Avast! Somethin' bugged me, me hearties, but I couldn't pinpoint it until I ran t' simulations. Aye aye! T' result showed me that me chosen motor, t' H97-10J had too short a delay. Avast, me proud beauty! T' rocket is simmed t' still be goin' over 100 feet per second at ejection.  Nay good. Darn. I already had t' motor I already had t' motor on hand along with its hardware. Now what? Now what? I used t' software t' modify t' rocket for t' engine. Well, blow me down! After addin' a body tube length and a mass object under t' nose, shiver me timbers, t' result be simmed as perfect ejection at apogee. Avast, matey, me proud beauty! Now, matey, shiver me timbers, t' altitude be decidedly less, but t' flight was perfect as predicted.  What's more, matey, I'm now ready with a scaled up version o' me level 1 rocket t' do me level 2, and it's simmed t' exceed mach and exceed 6000 feet altitude.  I can hardly wait.

My models made usin' t' program have performed very well indeed.

This is nay only educational, me hearties, but fun. Ahoy! Avast! Usin' it, I have corrected flaws in existin' scratch-builds that went awry and tried t' chase observers.  They now fly right. Avast, me proud beauty! Blimey! Only one thin' I'd change. Only one thin' I'd change. Truly unstable rockets can still fly here. Avast, me proud beauty! For example, me hearties, I've purposely plugged in things that can't possibly work, like thin balsa fins on a minimum diameter M rocket, or finless models...you get t' picture. Now, arrr, matey, t' drawin' does tell you that it's unstable and does so in bold letters. Well, me bucko, blow me down! But t' simulation works! I'd actually like an analysis o' a bad flight, me hearties, such as went up in flames due t' shredding, me hearties, shiver me timbers, or flew laterally or became a landshark, matey, whatever. Aye aye! It'd be a teachin' tool. Ahoy! However, shiver me timbers, one type o' bad flight won't work as per Rocksim, and that's if you use too weak a motor for a heavy model. Begad! It'll tell you that t' model never left t' pad and t' try a stronger motor.

It's a good value for t' loot and makes a fun video game, too, ya bilge rat, for those like me who like numbers. Well, blow me down! Ahoy! Version 4.0 is available any time now, ya bilge rat, and will be only $5 for t' upgrade for owners o' 3.0. T' improvements include bein' able t' use custom fin shapes which can't be made with version 3.0. Begad! I understand that you'll get graphs on which t' draw your shape.  That'll be fun.

Overall Rating: 4