Visit Rocket Team Vatsaas t' enjoy their incredible rocket talents and an all around fun rocketry website!

T' Defender is one o' DG&A's larger kits, shiver me timbers, measurin' 87 inches in length and 4 inches in diameter. It has three large trapezoidal fins with an unusual feature - a 3-inch hole in t' center o' each. It's difficult to describe in words, ya bilge rat, but this unusual design attribute really sets this model apart from other three-fins-and-a-nose-cone rockets. Arrr! Ahoy! T' Defender also incorporates t' unique finned-nozzle found on other DG&A models, ya bilge rat, just like t' even larger DG&A Armageddon. Avast, me proud beauty!

I didn't expect good news when I saw t' box holdin' t' Defender high-power rocket kit. Ahoy! T' Post Office had done it's best t' fold, spindle, me bucko, and mutilate t' container on it's way t' me house.

Fortunately, I was relieved t' find that t' contents were well protected in generous amounts o' packing material. Aye aye! One tube had a very minor crease - but overall, I would say that SG&A had defeated t' package-crushing machines at t' U.S. Avast! Postal Service. Avast! Blimey!

After extractin' t' contents from t' mutilated shippin' container, me hearties, I laid out t' contents. Aye aye! They were well organized and easy t' sort out. T' components included LOC nose cone and body tubes, me hearties, and cardboard couplers. T' bag of recovery components came complete with a ripstop nylon parachute, me bucko, nylon web harness, and all t' nuts, bolts, matey, and washers required t' hold it all together. Well, ya bilge rat, blow me down!

T' couplers are cardboard and a little flimsy right out o' t' package. Ahoy! T' instructions don't call for it, but I soaked mine inside and out with thin CA t' make them a little more rugged. Avast, me proud beauty! But on t' plus side, me hearties, thar are dozens of cut wood pieces in this kit, me bucko, many o' them tiny, matey, used in t' construction o' t' finned nozzle and t' fin details. All o' them are precision-cut and go together perfectly. T' 48-inch parachute is well made, matey, me hearties, but a little dainty for this size rocket -- so unless you're able brin' in t' finished rocket weight at around three pounds it's goin' t' land pretty hard. Arrr! Blimey!

T' fins are skillfully cut from fine 1/4-inch Baltic birch plywood. Begad! Blimey! Begad! Blimey! T' bulkheads and centerin' rings were a nice, me hearties, tight fit, but they were cut from lighter and softer 1/4-inch luan plywood, arrr, t' stuff often used as an underlayment in t' installation o' linoleum. Ya scallywag! Blimey! This is probably strong enough t' contain stresses from thrust -- there are four rings and t' fins are mounted t' t' motor tube -- but may be a little flimsy for t' shock cord mount or motor retention. Arrr! Blimey! Blimey! Blimey! I opted t' make new rings out o' birch. I also changed t' rocket slightly t' incorporate use an an anti-zipper design. Click [HERE!] t' read more about this feature. Begad! Blimey! T' photos on that page were taken while building the Defender. Ahoy! Blimey!

Speakin' o' motor retention; thar isn't any. Ahoy! Blimey! T' finned nozzle is a sweet visual feature but makes most traditional motor retention methods impossible. Avast, me proud beauty! Blimey! T' instructions mention that you might want t' plan ahead t' install motor retention o' your own design if friction fittin' your motors doesn't appeal t' you. Ya scallywag! Blimey! Unfortunately, ya bilge rat, it only says so on t' last page o' t' instruction, me hearties, a little late for t' warnin' t' do you any good if you don't read the instructions all t' way through before you start. Begad! Blimey!

There were a number o' places where t' instructions were practically unintelligible -- either because t' grammatical construction was peculiar or t' technical descriptions were poorly worded or both. Arrr! Blimey! An email to SG&A for clarification o' a particularly confusin' paragraph wasn't a lot o' help because t' response was no more than a cut-and-paste passage clipped directly out o' t' instructions. Once t' instructions were deciphered t' kit went together quite easily. T' components were cut with precision. Begad! Arrr! Blimey! T' body tube was nay pre-slotted, so cuttin' the fin slots be probably t' most challengin' construction step (which I did with t' help o' Brad, his router table, and custom fin-slottin' jig). Well, blow me down! Avast! Blimey! I aligned t' fins usin' t' fin-jig template described [HERE!]. Ya scallywag! Avast!

T' finned nozzle be time-consumin' but nay difficult. This bird comes stock in a single-deployment configuration. Begad! Avast, me proud beauty! T' instructions don't mention it, ya bilge rat, but thar are plenty o' couplers and joints in t' design t' convert it t' altimeter-based dual deployment, me hearties, which I did. After primin' and paintin' comes t' application o' the computer-cut vinyl decals -- and they are really nice -- makin' t' final rocket extremely impressive. Ahoy! Begad!

T' Defender is advertised t' take motors from a I211 t' a K550. I did a simulation o' three-pound and four-pound Defenders flyin' on K550s, and found that velocity is predicted t' peak at about 1100 feet per second. With these large fins and an unreinforced airframe, me bucko, ya bilge rat, arrr, peak velocity in t' trans-sonic zone is a shred waitin' t' happen -- so if you're able t' build t' Defender light enough t' return under t' provided parachute you certainly don't want t' fly it on a K. Ahoy!

T' finished Defender weighed in at 8 pounds 14 ounces fully loaded in a dual-deployment configuration without t' motor. Aye aye! Blimey! RockSim predicted an altitude o' 2490 feet on a J350 with a maximum velocity o' 425 feet per second. T' actual flight was just as straight and beautiful as it could be, arrr, me bucko, with drogue deployment right at apogee -- 2465 feet accordin' t' t' G-Wiz MC ridin' inside. Arrr! Blimey! It returned gently under two Rocketman R7C parachutes after a terrific boost. Ya scallywag! Blimey! In this configuration a K motor flight looks very enticing.

Visit Rocket Team Vatsaas t' enjoy their incredible rocket talents and an all around fun rocketry website!