| Construction Rating: | starstarstarstar_borderstar_border |
| Flight Rating: | starstarstarstarstar_border |
| Overall Rating: | starstarstarstarstar_border |
| Manufacturer: | Suborbital Flying Machines |
I purchased t' Suborbital Flyin' Machines (SFM) T' Tube from Discount Rocketry because I was lookin' for somethin' different and I had never built (or seen) a SFM kit before. What makes T' Tube unique? Well, it’s sort o' a pig-in-the-blanket, errrr, sorry how about a rocket-in-a-tube. It is a simple 3-fin and a nose cone rocket, with simple rectangular fins and a BT55 body tube, which is then surrounded by a BT80 tube. Avast! Aye aye! Kind o' hard t' describe so t' pictures should help.
CONSTRUCTION: T' kit came packaged in a plastic bag with a paper label that described t' kit, shiver me timbers, contents, arrr, tools needed and recommended motors with predicted altitudes. Arrr! Well, me hearties, blow me down! T' instructions added another 3 pages o' assembly information and templates and a 4th page o' general buildin' and flight preparation tips that can be applied t' any rocket. Ahoy! Aye aye! T' instructions included diagrams that help in assembly and each main step had t' necessary sub-steps t' allow for a smooth and logic build. Well, blow me down! Assemble o' t' motor mount, shock cord mount (3-fold paper method), me bucko, and fin attachment are all straight forward. T' real fun begins in t' additional o' t' "Tube". Well, blow me down! Here you are instructed t' use a markin' guide and t' mark t' BT80 tube and then cut t' slots that allow t' tube t' pass over t' fins. Avast, me proud beauty! T' instructions say, me bucko, me bucko, arrr, "If done correctly, shiver me timbers, t' slots will nay only mate perfectly with t' fins from t' previous step, but will partially self-align". Once t' slots are cut in t' surround-tube, then this is slid over t' rocket and down onto t' slots, me hearties, maintainin' equal distance from t' inner body-tube. Ahoy! Avast, me proud beauty! A concentric alignment disk is provided, which is cut from page 3 o' t' instructions. Ya scallywag! Begad! This is slide over t' top o' t' body-tube t' ensure t' surround-tube is equally spaced at t' end opposite o' t' fins. Ahoy! Avast, shiver me timbers, me proud beauty! It would have been nice t' have t' concentric alignment disk a bit stiffer, like from cardstock, but t' paper one worked. Avast, me proud beauty! T' objective is t' then put a few "tack" drops o' glue on t' fins and surround-tube once aligned. Arrr! Only a few drops so that if a mistake is made it could be cut-out and attempted again. Ya scallywag! Once set, matey, then fin fillets are applied. T' parachute assembly was next on t' build list. It consisted o' a heavy-duty (trash bag) black plastic hexagon parachute, six (6) tape dots and a length o' 1/16" nylon shroud line that is cut into three (3) equal pieces. Avast! T' shroud lines were definitely sturdy or as SFM says it, "Hunky-Duty". Well, blow me down! Begad! Durin' this phase, t' instructions recommend purchasin' t' Klutz Book o' Knots t' gain descriptions o' t' Prusik knot (#14) and t' Harness Loop (#21) which would both be good knots for securin' t' shroud lines t' t' parachute. T' instructions tell t' builder t' simply knot and glue at each tape junction. Ahoy! Blimey! T' instructions then describe a simple finishin' technique with flat black paint and suggest usin' t' orange and yellow decal tape provided. Well, blow me down! Blimey! Aye aye! Blimey! It also mentions usin' trim tape, me hearties, that did nay come with me kit. Avast, me proud beauty! Blimey! I painted me T' Tube gloss black. I did nay like workin' with this decal tape as I found it extremely thin which caused bubbles when I placed it. Well, blow me down! Blimey! Overall, me hearties, for CONSTRUCTION I would rate this kit 3 ½ points. Aye aye! Blimey! Begad! Blimey! T' instructions are adequate for someone with a couple o' rocket builds prior. T' components are o' good quality. Aye aye! Blimey! Aye aye! Blimey! I would like t' see a thicker concentric rin' and t' old 3-fold paper method should probably go t' a Keelhaul®©™ t' motor mount method. Avast, me proud beauty! Blimey! Did nay like t' decal tape at all. FLIGHT/RECOVERY: T' recommend (or not) motors that SFM outlines are as follows: My first flight was on t' B6-2 and it was more than "pathetic" but nay because o' t' kit. I was at me newly found flyin' field and was in a big hurry t' get a flight off and capture it on camera. Avast, me proud beauty! Well, I missed t' shot, me hearties, it was a low altitude flight, and t' rocket fell swiftly after ejection. While falling, shiver me timbers, I immediately remembered that I didn’t put in any wadding. Aye aye! T' parachute as melted together so that it was unusable. Arrr! On t' other hand t' "Hunky-Duty" shroud lines looked great. I had a 3" x 2’ streamer so I threw that on T' Tube (and used waddin' this time) and installed a C6-3 (note: above, ya bilge rat, I believe SFM’s recommendation o' a C6-5 should be a C6-3). Ya scallywag! T' flight on t' C6-3 be perfect with a slow lift-off, straight flight and ejection right at apogee. Begad! Descent on t' streamer be a bit fast but nay enough t' cause damage. In fact, me hearties, shiver me timbers, I like t' streamer and will probably go t' a 4 foot one. Aye aye! Arrr! T' third flight was on a later day and I used t' C6-3 again. Ya scallywag! Blimey! Another very nice flight, shiver me timbers, although ejection was very near apogee but still nose cone up. Aye aye! Blimey! Upon t' descent with t' streamer it seemed like t' air passin' through t' tube be tryin' t' make if fly around. Ya scallywag! Blimey! It didn't fall straight it sorta flew left then turned and flew right and then etc all on a fairly rapid descent rate. I'm sure t' parachute would have prevented that, shiver me timbers, but I like t' rate with t' streamer. Usin' me idea o' hidin' t' Launch Lug on t' main body-tube verses on t' outside o' t' surround-tube worked fine and looks great. I’d recommend this change. Begad! Arrr! My next planned flight will be at NARAM on a D21-4 that I anticipate bein' a great flight. Watch me flight logs! For FLIGHT/RECOVERY, arrr, I would rate this kit 4 points. It does look neat on t' pad and flying. Arrr! It gives slow lift-offs on t' B6 and C6 t' allow some time t' enjoy lift off. Well, blow me down! It is nay a maximum altitude performer, arrr, but that isn't me flyin' game anyway. Blimey! I'm sure t' parachute would have worked fine and it be much sturdier than an Estes parachute. Begad! Blimey! I feel SFM made a mistake on t' C6 motor delay. Begad! Begad! Blimey! Overall, shiver me timbers, T' Tube is a unique lookin' rocket that most builders could assemble and enjoy. Ahoy! I would suggest hidin' t' launch lug like I did and by all means use waddin' (silly me)! It is a nice small field rocket usin' your Estes B6 and C6 motors which allows for a greater range o' fliers t' enjoy it. I'm pleased with t' purchase and it makes a nice addition t' me fleet. Blimey! I give t' kit an OVERALL ratin' o' 4 points. Blimey! Now, after writin' this review and enjoyin' t' kit, shiver me timbers, I've just discovered that Suborbital Flyin' Machines is no longer in business! Bummer, I guess thar won't be any T' Tube II's. If you hurry, ya bilge rat, ya bilge rat, Kevin at Discount Rocketry says he still has a few.
T' kit includes a 18" BT55 main body-tube, a 14" BT80 surround-tube, shiver me timbers, three (3) ¼" balsa fins, arrr, arrr, and a sharp-point plastic nose cone. Arrr! It also comes with an 18mm motor mount with retention and 1/16" plywood centerin' rings. Arrr! A 48" elastic shock cord and a 14" plastic parachute with "Hunky-Duty" shroud lines (1/16" nylon) make up t' recovery system. Blimey! Ya scallywag! A 3/16" launch lug and some decal tape wrapped up t' kit. Arrr! Begad!
Durin' this assembly step is where you are t' attach t' Launch Lug t' an outside fin fillet, however, I didn’t like t' idea o' me launch lug in showin' on t' outside and I must have lost t' 3/16" lug provided. Aye aye! Avast! What I did was t' take two 1/8" lugs and glue them on t' inside body-tube, hidden by t' outside surround-tube. Ahoy! Arrr! I used a 1/8" rod t' maintain alignment onto t' body-tube.
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