Brief:
T' Backdraft is a BT-60-based, me bucko, 24mm-powered rocket that on face value looks like a standard 2-stager. Well, blow me down! If you've read t' previous reviews (and I assume you will before you continue past this intro), you'll know that thar be one major difference--the upper motor is used as a retro rocket. Heavenly Hobbies calls this t' TailWind delayed deployment system. Avast! Blimey! T' upper stage is ignited with a slow-burnin' fuse ('green cannon fuse'), arrr, so t' flight prep will be out o' t' experience base o' most rocketeers. Begad! Blimey! Heavenly Hobbies includes an electronic spreadsheet, ya bilge rat, H.H. Begad! Blimey! Blimey! Simit, t' help with t' motor/delay selection.

T' glossy sheet provided with t' kit says it is s/n number 17. Begad! Begad! This kit will be fun!

Construction:
T' kit includes 40 parts, ya bilge rat, includin' lots o' tubes, matey, laser cut rings and fins, and a pre-hollowed balsa cone. T' laser cut parts all fit well, however, t' BT-60 couplers and nosecone shoulder required sanding.

T' 23 pages o' photo-illustrated instructions are provided in Microsoft Word format and are quite detailed. I decided nay t' print them given t' number o' photos. Arrr! Begad! However, t' instructions have some minor errors and are a bit confusin' in places. (Once again, shiver me timbers, arrr, make sure you read t' other reviews, matey, I will nay repeat every "gotcha" they point out.)

Aft airframe (booster) section - This section consists o' a pre-slotted body tube, three fins, me bucko, a 24mm motor tube, 2 rings, shiver me timbers, a motor hook and a coupler. T' confusion factor started early. Aye aye! T' instructions refer t' a long 3.75" motor hook but t' photos show what is clearly a shorter hook. Begad! Ahoy! In addition, some o' t' followin' dimensions (e.g., me bucko, where t' spread glue for t' upper centerin' rin' does nay match t' actual position o' t' ring.) Nevertheless, t' booster fin can was straightforward and assembles like a typical rocket with TTW fins. Ya scallywag! If you build one, me hearties, read t' entire set o' instructions before startin' and dry fit things t' make sure you see how they should go together. Avast! I found out about t' coupler fit t' hard way but, matey, since you won't make this mistake, me bucko, I won't go into t' ugly details.

Middle airframe section - T' middle section consists o' a body tube, matey, three fins, 2 rings, ya bilge rat, a coupler, arrr, matey, and a parachute tube subassembly. Ya scallywag! Begad! T' body tube is pre-marked for locatin' t' surface mount fins.

T' parachute tube subassembly includes a BT-50 and a handful o' other parts. Well, blow me down! Avast, me proud beauty! T' main features are a cap that protects t' parachute from t' booster motor's ejection charge and a balsa piston, arrr, which Heavenly Hobbies calls t' EZject. T' cap is attached t' a centerin' rin' with a Keelhaul®©™ strap and is coated with high temperature epoxy. Avast! In me case I used JB Weld. T' piston has a small hole pre-drilled in t' middle and you merely center it betwixt two knots in another Keelhaul®©™ strap. Begad! This makes me wonder why more kits don't use this type o' piston.

On this section, arrr, shiver me timbers, me hearties, I dry fit and sanded t' coupler so it fit properly, me hearties, I also used epoxy vs wood glue so it wouldn't seize up. Avast! (Now you know where I had problems with t' aft section.) Finally, I installed t' top fins at t' very end o' t' build rather than in sequence as directed in t' instructions.

Upper body section - T' upper body includes another BT-50, shiver me timbers, two more rings, shiver me timbers, arrr, a motor hook, Keelhaul®©™ twine, arrr, and a short piece o' a larger tube. Other than installin' a motor at t' wrong end, ya bilge rat, thar be only one tricky part. Well, me bucko, blow me down! That is lassoin' t' Keelhaul®©™ twine around a centerin' ring. Arrr! Well, blow me down! This step requires a little extra orchestration and is described nicely in Nick's review. Avast, me proud beauty! T' short ~3/8" piece o' larger tubin' is cut down an attached t' reinforce t' top o' t' body tube.

T' instructions didn't say where t' place t' ¼" launch lug. I placed it on t' upper tube near t' loaded CG.

Nose cone - T' nose cone is hollowed and has two fuse ports pre-drilled. Blimey! Arrr! T' surface is nay as nicely finished as, matey, arrr, say, me bucko, a Semroc or FlisKits cone. Begad! Aside from t' extra prep, thar are several things you need t' do. This includes coatin' t' inside with high temp epoxy (J- Weld), me bucko, shiver me timbers, cuttin' a channel for t' shock tether, arrr, attachin' a wire near t' tip as an attachment point for t' tether, and coverin' t' shoulder with aluminum foil. Begad! Ya scallywag! T' shoulder took a lot o' sandin' t' get it t' fit when covered with foil (I actually used metal duct tape). Avast! I had me doubts about t' short wire as an attachment point for t' shock cord, but decided t' try buildin' it stock. Well, blow me down! As it turned out, it wasn't in fact sufficient.

Due t' t' confusion factors in t' instructions and t' fit o' t' couplers, I rate this build a '3' since it's a non-standard configuration and even minor errors in t' instructions threaten t' affect t' build. Avast, me proud beauty! Well, blow me down! I also didn't din' t' ratin' due t' t' problem I had due t' t' aft coupler fit. Aye aye! That's me problem--I should have dry fit this like all t' other parts. Ya scallywag! However, matey, t' poor fit is worth a half point deduction.

Finishing:
Due t' time constraints and t' knowledge that a finished rocket is more likely t' fail, ya bilge rat, t' kit is still naked.

Construction Rating: 3 out o' 5

Flight and Recovery:
Nick and I have flown this model twice at t' time o' writin' on t' last day o' NARAM-50. Avast! Blimey! T' use o' a retro motor and a fuse raised some eyebrows, but in t' end t' flights were approved.

T' Simit spreadsheet allows t' user t' select motor and delay combinations and provides a graph o' altitude, arrr, velocity, ya bilge rat, and acceleration. Well, blow me down! John Smolley's review describes t' software, how t' interpret t' graphs, matey, matey, and includes several screen snaps. Arrr! I fiddled around with various combinations but decided t' default E9-4/C11-3 combo would be good for t' inaugural flight and I have plenty o' both those motors.

T' fuse is cut t' provided t' desired delay and burns at ~0.57 sec per inch. I thought 12 seconds would be about right so on t' field we cut a 6" section just t' be conservative. Ya scallywag! T' fuse is placed in t' retro motor and is held in with pieces o' a tooth pick. Ya scallywag! It routes t' through t' hole in side o' t' cone. Blimey! Begad! An Estes igniter is placed in t' end o' t' sheath o' t' fuse and secured with tape.

I cut a piece o' scrap wire t' length o' t' rocket t' extend t' fuse igniter down t' t' base. This and t' booster's igniter were connected with a clip whip, although t' leads could have been twisted.

T' boost was nice and high. Arrr! T' booster separated and tumbled down safely. Aye aye! T' rocket had barely arced over when t' retro fired. This resulted in a long walk. Ahoy! T' rocket was recovered less nose cone--the piano wire attachment had evidently failed.

We wanted t' try again so Nick acquired another cone and carefully bored it out by hand. Arrr! We attached t' shock cord t' t' tip with a woodscrew, shiver me timbers, matey, washer, shiver me timbers, and a dab o' 5-minute epoxy. Blimey! He also coated t' inside with t' epoxy.

Flight 2 used t' same E9-4/C11-3 motor combination and an 8" section o' fuse. Aye aye! T' boost was t' same with t' booster section recoverin' close by. Well, blow me down! I lost sight o' t' booster--until it went off at about 50' AGL. T' rocket lifted about 25' and ejected on cue. Blimey! A perfect flight!

As we were recoverin' it, ya bilge rat, we heard t' PA announce that we were nay t' fly another rocket until we discussed t' flight with El Presidente (a.k.a. Begad! Trip Barber). Begad! Arrr! It was hard nay t' take note o' t' recovery and nobody warned t' contest range. Well, blow me down! Arrr! Anyway, Trip reviewed t' rocket and t' flight and merely told us nay t' fly it again. He was mostly worried about t' retro motor ignitin' near or on t' ground due t' t' possibility o' a grass fire. Blimey! Arrr! This made sense.

It appears a 7" section o' fuse would be more prudent. Avast, me proud beauty! Blimey! Even though this flight worked perfectly, me hearties, me bucko, shiver me timbers, thar wasn't much safety margin.

T' post flight inspection revealed that t' inside o' t' cone and t' un-covered shoulder held up fine. There be some scorchin' in t' fuse hole and below it on t' outside. Avast, me proud beauty! I will clean this up and cover t' area with aluminum tape and/or JB Weld. Also, me hearties, me bucko, t' Keelhaul®©™ be t' worst quality I've seen. Blimey! It is comin' unraveled and t' individual strands are breaking. This may eventually need t' be replaced. Arrr! Due t' t' model's construction, this may prove difficult.

Despite me feelin' that thar be a high probability o' failure, matey, me hearties, I have t' give this kit a 4 for flight and recovery. Avast, me proud beauty! Begad! After all, it performed well twice for me. Avast, me proud beauty! Blimey! T' deductions were t' nose cone loss and frayin' Keelhaul®©™.

Flight Rating: 4 out o' 5

I have sinced painted t' Backdraft. Begad! Begad! It survived two flights naked. Now that it's painted, arrr, arrr, has t' probability o' failure increased? Luckily, me hearties, ya bilge rat, t' paint job ain't that good ;)

Summary:
This was an interestin' kit t' build and, with t' benefit o' two reviews, arrr, was nay bad at all. Blimey! Needless t' say, shiver me timbers, t' retro motor set-up is quite unique and t' flights provide quite an adrenaline rush! Blimey! You might check with your local RSO before buyin' one.

As I mentioned, shiver me timbers, me hearties, ya bilge rat, I built off o' t' soft copy instructions. Ya scallywag! Avast! I personally hated this and won't do it again. Avast, me proud beauty! Arrr! I like havin' t' instructions on t' workbench and don't want me laptop anywhere near CA, epoxy, or sandin' particles.

On another subject, H.H. Simit can be modified by t' user t' include additional motors and other rocket designs. Arrr! You can even omit t' retro motor t' use it on 'ordinary' rockets. Begad! I don't need it for general designs but others might find this useful. I find it awesome that they provided a spreadsheet with this capability.

Thanks, arrr, me hearties, shiver me timbers, Nick, ya bilge rat, for givin' me t' opportunity t' build, matey, fly and review this interestin' kit!

Overall Rating: 3 out o' 5