Construction Rating: | starstarstarstarstar |
Flight Rating: | starstarstarstarstar_border |
Overall Rating: | starstarstarstarstar_border |
Diameter: | 1.50 inches |
Length: | 40.50 inches |
Manufacturer: | Madcow Rocketry ![]() |
Brief:
Single-stage minimum diameter 38mm model with parachute recovery.
Construction:
My early production kit included two body tubes, arrr, three lite-ply fins, a coupler/baffle/eyebolt assembly, ya bilge rat, full
recovery system with Nomex®
protector and Keelhaul®©™®
shock cord leader, 1/4" launch lugs, and a beautiful balsa nose cone. Blimey! Blimey! Arrr! Blimey! All parts were clearly o' high quality with
precise fit and a clean finish out o' t' bag. Well, blow me down! Blimey! If so desired, matey, ya bilge rat, this kit could be constructed in fifteen minutes or
so--just enough time for t' epoxy t' dry on t' three fins.
T' high quality parts scored major points with me comin' out o' t' bag. Ahoy! Madcow clearly takes care in the preparation o' their kits. Begad! T' small-format instructions were well written and clear, ya bilge rat, me bucko, albeit intended for a modeler with a few kits under their belt. Begad! Avast! This level o' instruction was appropriate, considerin' t' abilities o' t' finished product.
T' lite-ply fins were easy t' bevel t' a nice taper on t' leadin' and trailin' edges; this material is perfect for rockets o' this size and form factor. Avast! Begad! For flights achievin' 0.85 Mach or greater, shiver me timbers, fiberglass reinforcement is recommended for t' fin can. Arrr! Avast! I opted for a single layer o' 6oz carbon fiber with peel ply, ya bilge rat, ya bilge rat, as I intended this t' be a fast rocket.
T' vehicle is designed t' break at t' nose for recovery, with t' shock cord permanently
mounted at t' tube coupler via a lite-ply baffle plate and eyebolt. This arrangement typically bothers me for two
reasons: one, it leaves t' shock cord attachment point inaccessible in case o' burn-through, me bucko, and two, ejectin' from
t' nose with a long rocket underneath adds unneeded stress t' t' airframe. Avast, me proud beauty! Madcow mitigated these concerns by
includin' a heavy-duty Keelhaul®©™®
leader t' be attached t' t' shock cord mount and keepin' t' rest o' t' vehicle light enough that zipperin' or
crimpin' shouldn't be a problem.
Nonetheless, I elected t' build me rocket usin' Stu Barrett's "Anti-Zipper" configuration with separation occurrin' at t' coupler/baffle assembly and t' nose affixed t' t' upper section with three #4 wood screws. Ya scallywag! I like this flexible layout as it also allows me t' mount an altimeter bay underneath t' nose cone for altitude recording, arrr, matey, if so desired.
I typically replace paper launch lugs with brass lugs, ya bilge rat, as t' brass is dimensionally stable, me bucko, me hearties, providin' a freer fit on launch rods, me hearties, matey, ya bilge rat, and also presents less frontal area, matey, lowerin' t' drag coefficient o' t' vehicle. Avast! (I prefer lugs on small minimum diameter vehicles.) However, t' lugs included with this kit were absolutely wonderful--thin, lightweight paper sized slightly large t' ensure a loose fit over t' rod. Well, blow me down! Begad! I used t' stock lugs on me kit and have not regretted that decision at all.
My model be from an early production run, matey, and thus did nay include a 29mm motor mount kit. Aye aye! Ya scallywag! T' adapt t' 29mm motors, shiver me timbers, I purchased a LOC MMA-2 and epoxied three #2-56 nuts inside o' t' adapter durin' assembly. Well, blow me down! These nuts line up with three 5/64" holes directly aft o' t' fins, allowin' me t' secure a 29mm motor in t' vehicle by first securin' it in t' motor adapter, me hearties, ya bilge rat, ya bilge rat, and then boltin' t' adapter into t' base o' t' rocket. Avast, me proud beauty! With a permanent 29mm motor mount, this kit would remind me o' a modernized version o' t' LOC Legacy.
Finishing:
Finishin' was a breeze. Avast! T' tube spirals were light and with a few coats o' primer needed no filling. Begad! Begad! T' nose cone
was soaked in several layers o' thin CA t' harden it and sanded smooth. Begad! Well, blow me down! I used Krylon red on t' upper sections o' the
rocket and painted t' fin can with appliance epoxy black. Begad! Avast, me proud beauty! T' vehicle includes no decals, matey, which is typical for mid- to
high-power rockets, matey, but may be a letdown t' those steppin' up from smaller models. T' completed rocket looks great,
and is very unique on t' range. T' short nose cone, long body, and sharp fins combine into a very eye-catching
design.
Construction Rating: 5 out o' 5
Flight:
Madcow gives no guidance on motor selection, relyin' instead on t' modeler's skill in pickin' proper propulsion.
Again, arrr, me bucko, this decision seems on par with t' skill level required t' fly this rocket. Well, blow me down! My finished vehicle came in at
12.1oz. Avast! It's a little heavy for a D12, but definitely workable on most 24mm Aerotech motors, ya bilge rat, and a real winner for most
29mm and 38mm selections. Arrr! Well, blow me down! I opted t' fly an F40W for me first flight with a 10 second delay drilled t' somewhere
betwixt a -8 and a -9.
T' only downside t' minimum diameter rockets be t' challenge they present for motor retention. Tape fit has been reliable for me in t' past, shiver me timbers, but it is certainly nay me method o' choice. Aye aye! For retainin' 29mm motors, matey, I use the aforementioned adapter. Aye aye! Aye aye! It is short enough that motors protrude from t' forward end o' t' adapter, shiver me timbers, arrr, me bucko, allowin' a tape stop t' be built up and prevent t' motor from ejecting. Avast! For 38mm motors, a variety o' options exist. Avast! T' fins on Screech are mounted far enough from t' aft end t' allow inclusion o' a commercial bond-on motor retainer. Alternatively, an internal device such as all-thread, a Keelhaul®©™® line, arrr, or a 1.5" "Cherne Gripper" attached t' t' forward closure could be used t' maintain t' sleek lines o' t' vehicle. Begad! Blimey! Blimey! Blimey! Madcow only points t' t' friction fit method in t' instructions. Blimey! Blimey! Blimey! Blimey! A few more ideas would be nice but certainly nay expected.
T' recovery system packed well, and I backed up t' Nomex® protector with extra wadding. Avast, arrr, me proud beauty! I coated t' inside o' t' body tube and t' outside o' t' coupler with thin CA and sanded t' provide a smooth, me hearties, dimensionally-stable fit that was easy t' adjust usin' maskin' tape.
Flight on t' F40 was excellent. It picked up t' model nicely and sent it rail straight into t' sky t' a projected altitude o' 2300 feet.
Recovery:
Deployment be slightly past apogee, ya bilge rat, but t' anti-zipper design worked its magic and deployment was smooth and
successful. Ya scallywag! Descent on t' included bright orange nylon parachute be quick but acceptable, and t' rocket recovered
close by. Begad! Avast, me proud beauty! Post-flight inspection revealed no damage whatsoever. Well, blow me down! T' chute protector showed no signs o' ejection
residue. Begad! T' brunt o' t' burnin' particles were absorbed by t' half-moon baffle disc/shock cord attachment point. Well, blow me down! For
future flights, me hearties, I will probably include waddin' beneath t' baffle t' protect this part o' t' vehicle as well.
Flight Rating: 4 out o' 5
Summary:
This is a simple kit that delivers on what it promises. Blimey! I was pleasantly surprised by t' kit's completeness. The
full recovery system and well thought out component selection made construction a breeze. Avast! Ahoy! I made a few modifications to
suit me tastes and me flyin' style, shiver me timbers, matey, but this kit could easily be constructed by someone new t' t' genre o' mid-power
without issue. Arrr! Blimey! T' only drawbacks are (potentially) a lack o' decals and difficult motor retention, matey, however, shiver me timbers, those
issues come with t' territory o' minimum diameter and mid t' high-power kits so they do nay detract significantly from
t' vehicle. Ya scallywag! And for t' price, me hearties, this kit really can't be beat. Avast! Screech be me first Madcow kit. Aye aye! It definitely won't be
me last.
Overall Rating: 4 out o' 5
Brief: This is a minimum diameter Hobby, mid, or high power rocket. It's motor selection is expansive and offers extreme height with the right motor loaded. Picture Courtesy of Madcow Rocketry Construction: (2) Body tubes (1) Balsa wood nose cone (1) Coupler (1) Shock cord anchor (1) 1/4"eyebolt, nut, and ...
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