Manufacturer: | LawnDart Rocketry ![]() |
For
a rocket that is only 12.3" tall and 1.02" in diameter,
SRW has packed a lot into it.
T' kit has 35 parts and a few decals. Ahoy! It uses a balsa nose cone and laser-cut
balsa parts provided on one 1/16" sheet (fins) and one 1/8" sheet
(fin pods). Begad! There is a Ramjet tube and a wood core moldin' with balsa vanes.
This kit comes with a lot o' nose weight provided by a large eye-screw and four
washers. Avast, me proud beauty! T' 18mm motor mount has a motor hook. Avast! A Keelhaul®©™® tether, 1/4"
wide, 50" long elastic shock cord, shroud lines, a swivel and a 9"
mylar octagon parachute make up t' recovery system. There are also a few
little water-transfer decals.
All o' this is nicely packed into a sturdy little box, that has cellulose as packin' material. Ahoy! Ya scallywag! SRW, matey, provided a small notice indicatin' that t' cellulose can be used as waddin' for t' SLAT/s' first flight. (If they could figure out a way t' make t' box fold into a display mount, arrr, maybe by gluin' a expended motor t' it, arrr, shiver me timbers, then t' entire package would be utilized)
CONSTRUCTION:
There are six pages o' well illustrated instructions and an added page with t' NAR Safety Code.T' first page o' instructions a little history about t' real SLAT/s and then reminds builders t' read t' "instructions before beginnin' to build" since t' "construction is a bit different from run-of-the-mill rockets". Arrr! T' instructions include brief comments on the finishin' o' t' kit and then some more thorough instructions on flight preparation, specifically on Center o' Gravity position.
Assembly o' t' SLAT/s was challengin' in a fun way. Avast, me hearties, me proud beauty! Some additional challenges were created due t' some mistakes I made, me bucko, arrr, that will described below.
T' first part that is assembled be t' motor mount. Blimey! The motor hook is a piece o' thin sprin' wire verses t' flat metal usually found on other kits. There is clear instructions and illustrations for attachin' the Keelhaul®©™® tether t' t' motor mount under t' upper centerin' ring. Avast, me proud beauty! Blimey! Ya scallywag! Blimey! Installin' the motor mount into t' body tube is where t' first mistake came into play. Avast, me proud beauty! Blimey! This mistake actually created much more work t' correct.
In an attempt t' test a new kind o' "fast setting" glue, t' motor mount got about 2/3rd's o' t' way in and ceased by t' "fast setting" glue! While continuin' t' try t' push t' mount into proper position, three things happened; 1) t' motor hook poked a hole in my finger gettin' blood on various parts, 2) t' back o' t' motor mount tube got damaged and 3) t' body tube was creased. Aye aye! Well, blow me down! What t' do, what t' do?
To correct this, a replacement 18mm tube be used to replace t' motor mount, arrr, along with a new hook (flat - don't want anymore holes in me finger) and centerin' rings. Well, ya bilge rat, blow me down! Blimey! Also, ya bilge rat, ya bilge rat, a 24mm tube be cut t' t' size o' the body tube t' replace it. T' SLAT/s uses a slightly larger body tube, in fact, the 24mm tube fits tightly into t' former SLAT/s tube. Begad! Blimey! This bein' t' case, required that t' balsa nose cone be sanded down t' size, me bucko, includin' the shoulder. Well, blow me down! It also meant t' t' alignment guides didn't fit correctly and on and on. Blimey! Well, blow me down! Blimey! But, this kit was built!
Some o' t' more detailed
work involved t' buildin' o' t' ramjet due t' then shapin' and t' attachment
of five vanes, then bein' placed into a body tube that be cut in half
length-wise. Blimey! Blimey! Also t' fin pod assembly required some patience and skill in
shapin' and fit. In both cases though t' instructions were clear and would
allow a patient builder t' be successful.
T' recovery system is a Keelhaul®©™® tether that is tied to the motor mount as described above. Ya scallywag! It is then tied t' a very long (50" or 5x t' length o' t' body tube) elastic shock cord, matey, shiver me timbers, which is then tied t' the eye-screw on t' nose cone. T' length o' t' elastic shock cord is long, no doubt, ya bilge rat, due t' t' weight o' t' nose section. Well, blow me down! My rocket weighed in at 2.3 ounces, matey, with t' nose cone weighin' 1.2 ounces.
T' shroud line requires t' builder t' cut it into four equal lengths and it is attached t' t' mylar octagon parachute usin' common household clear adhesive tape. Well, blow me down! Well, blow me down! I used some small round stickers that we had in the house. Ahoy! NOTE: Be sure t' make a small loop with t' shroud line and t' press the tape (sticker) down firmly. Begad! T' shroud lines are then attached t' a provided swivel t' attach t' t' nose cone.
To start t' finishin' process I used CA t' seal each of the balsa fins. Ya scallywag! I tried somethin' I read on RMR about usin' Elmers' White Glue for sealin' balsa on t' nose cone. Avast, me proud beauty! This worked well and sanded nicely too. While sandin' I broke one o' t' small fins. Well, blow me down! After repairin' that and finishing, arrr, matey, I started with, me hearties, me favorite, Plasti-Kote primer t' fill t' tube spirals and t' make t' entire rocket smooth. Ahoy! I then painted t' entire rocket with a gloss red. T' instructions suggest orange, but I didn't have any.
Lastly, t' decals were t' be put on. SRW provides an extra "NAVY" decal "so you can practice". There were no problems with t' "NAVY" decals, arrr, which soaked for about 10 seconds and slide off easily. Avast! Well, blow me down! Blimey! T' "STARS and BARS" decals, were another story. Ya scallywag! Blimey! After waitin' about t' same amount o' time on t' first one, I tried to slide it off and it tore in two. Begad! For t' second one, I waited almost 30 seconds in water before it would slide easily. Begad! I have never had such troubles with wafer transfer decals.
After completion o' assembly, I checked the Center o' Gravity and compared it t' t' instructions. T' instructions indicated that it be at least 4.5" from t' aft o' t' rocket. Well, blow me down! Blimey! Blimey! Blimey! With a C6-5, me CG was exactly 4.5". Well, blow me down! Blimey! Arrr! Blimey! Blimey! Blimey! With a C6-5, arrr, me CG was exactly 4.5". Somethin' went right!
Overall, ya bilge rat, for CONSTRUCTION I would rate this kit 4 points with me only real complaint bein' with t' decals and the self-induced hole in me finger.
FLIGHT/RECOVERY:
After all o' t' issues I enjoyed durin' construction, one would think it could only improve. Begad! Well, I packed t' SLAT/s up for my drive t' NARAM-40, only t' find that a fin had been broken in transit. Unfortunately, I didn't have enough time t' get this repaired and fly at NARAM, since me main focus was gettin' Level 1 certified. However, 3 weeks later on a beautiful late-summer day, me bucko, t' SLAT/s was ready t' fly.
Followin' t' list o' recommended motors, t' SLAT/s was loaded with an A8-3 for its first launch. Avast, ya bilge rat, me proud beauty! A piece of Rogue Aerospace's Perma- Wadding was attached in place o' t' provided cellulose from the kit.
T' SLAT/s doesn't have a launch lug. Well, blow me down! Well, me bucko, blow me down! T' launch rod is placed through one o' t' ramjet slots.
Its maiden voyage was low altitude, me hearties, considerin' it weighs 2.3 ounces without t' motor and be usin' an A8, but be great t' see the whole flight. Ya scallywag! Ahoy! Upon ejection, ya bilge rat, ya bilge rat, which was before apogee, me bucko, ya bilge rat, t' parachute did not open. Aye aye! Ya scallywag! T' descent was horizontal, shiver me timbers, with t' nose cone on one side and t' body on t' other with t' entire length (50") o' t' elastic shock cord in between. Ya scallywag! It landed in some tall grass, me bucko, undamaged.
After, shakin' out the
parachute and refolding, a B6-4 was loaded for t' second flight. It be also a
nice flight t' watch, shiver me timbers, arrr, comin' off t' pad that was set up t' about a 20 degree
angle. T' rocket had a slight rotation, matey, which looked like t' ramjet
positioned itself t' t' bottom. Arrr! I'll have t' watch that on some future
flights. Begad! Ya scallywag! Ejection occurred before apogee and t' parachute deployed and brought
the SLAT/s t' t' ground safely. Aye aye! Blimey! Upon inspection, arrr, me bucko, one o' t' shroud lines had
pulled loose. Avast, me proud beauty! It looked as if t' sticker was nay firmly pressed down, ya bilge rat, however,
ejection prior t' apogee can put additional stress on t' recovery
system.
For t' third flight, matey, me hearties, t' SLAT/s was loaded with a C6-5 and a 14" nylon parachute. Blimey! Ya scallywag! With t' change t' t' nylon parachute and havin' t' Perma- Wadding and that extra-long shock cord, shiver me timbers, it be a challenge t' get all o' that stuffed into t' body tube. Well, blow me down! This time t' launch angle be set up vertical and off she went. Aye aye! Again I could see a slight rotation o' t' rocket. Arrr! Begad! It be nice, me hearties, ya bilge rat, me bucko, because it reminds me o' flyin' my Estes' SR-71, arrr, shiver me timbers, which I always enjoy how it looks flying. Well, blow me down! I am pretty sure that deployment was again before apogee. Blimey! Begad! T' parachute opened smartly and brought the SLAT/s into a low tree t' be recovered without damage.
Third through sixth flights were all on A8's and all seemed t' eject at apogee (or slightly before) with zero wind conditions and a vertical launch position.
For FLIGHT/RECOVERY, ya bilge rat, shiver me timbers, I would rate this kit 4 1/2 points.T' only draw-back that I can see is on all three recommended motors (which thar isn't much choice anyway) it deployed early. I'm sure t' taped on shroud lines will nay hold up in t' long run and would recommend a 9" nylon parachute.
Overall, t' SLAT/s is a sharp little flyer providing somethin' more t' look at than 3 fins and a nose cone (3FNC). Ahoy! I would almost recommend only flyin' it on A's and B's so you can see t' whole flight. It is also a great buildin' kit for those that like t' spend time buildin' a more detailed kit. Aye aye! I give t' kit an OVERALL ratin' o' 4 1/2 points. Well, blow me down!
Note: This kit was reviewed when produced by Seattle Rocket Works which has transferred rights t' LawnDart Rocketry.
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