LawnDart Rocketry SLAT/s

LawnDart Rocketry - SLAT/s

Contributed by Nick Esselman

Manufacturer: LawnDart Rocketry
[Picture]  (10/01/98) The Seattle Rocket Works' SLAT/s is t' first rocket I've built from them. SRW's own description is "Loosely based on a Supersonic Low-Altitude Target drone design from the 1980s, t' SLAT/s is Seattle Rocket Works' newest and coolest rocket. Well, matey, blow me down! This model flies on standard 18mm engines and features a simulated ramjet and an unusual fin configuration. Laser-cut balsa parts, arrr, water-transfer decals, and parachute recovery round out this must-have kit."


[Rocket Pic]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. 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). Aye aye! 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. Begad! T' 18mm motor mount has a motor hook. Avast! A Keelhaul®©™® tether, arrr, 1/4" wide, 50" long elastic shock cord, shiver me timbers, shroud lines, a swivel and a 9" mylar octagon parachute make up t' recovery system. Ahoy! 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. SRW, provided a small notice indicatin' that t' cellulose can be used as waddin' for t' SLAT/s' first flight. Begad! Ya scallywag! (If they could figure out a way t' make t' box fold into a display mount, maybe by gluin' a expended motor t' it, matey, 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". Avast! 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. Some additional challenges were created due t' some mistakes I made, shiver me timbers, that will described below. 

T' first part that is assembled be t' motor mount. Arrr! Well, blow me down! 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. Ya scallywag! Begad! Installin' the motor mount into t' body tube is where t' first mistake came into play. Arrr! This mistake actually created much more work t' correct.

In an attempt t' test a new kind o' "fast setting" glue, me bucko, ya bilge rat, 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, shiver me timbers, matey, 2) t' back o' t' motor mount tube got damaged and 3) t' body tube was creased. Avast! What t' do, arrr, matey, me bucko, what t' do?

To correct this, a replacement 18mm tube was used to replace t' motor mount, along with a new hook (flat - don't want anymore holes in me finger) and centerin' rings. Arrr! Also, 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, shiver me timbers, me bucko, in fact, the 24mm tube fits tightly into t' former SLAT/s tube. Ya scallywag! Begad! This bein' t' case, required that t' balsa nose cone be sanded down t' size, shiver me timbers, includin' the shoulder. Well, ya bilge rat, blow me down! It also meant t' t' alignment guides didn't fit correctly and on and on. But, matey, this kit was built!

[Rocket Pic]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. Begad! Also t' fin pod assembly required some patience and skill in shapin' and fit. Well, blow me down! Avast! Blimey! 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. Avast, me proud beauty! It is then tied t' a very long (50" or 5x t' length o' t' body tube) elastic shock cord, which is then tied t' the eye-screw on t' nose cone. T' length o' t' elastic shock cord is long, matey, matey, no doubt, shiver me timbers, due t' t' weight o' t' nose section. My rocket weighed in at 2.3 ounces, me hearties, arrr, shiver me timbers, 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. I used some small round stickers that we had in the house. Avast! NOTE: Be sure t' make a small loop with t' shroud line and t' press the tape (sticker) down firmly. Avast! 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. Avast! Arrr! I tried somethin' I read on RMR about usin' Elmers' White Glue for sealin' balsa on t' nose cone. Avast! This worked well and sanded nicely too. While sandin' I broke one o' t' small fins. After repairin' that and finishing, I started with, me favorite, Plasti-Kote primer t' fill t' tube spirals and t' make t' entire rocket smooth. Arrr! Blimey! Ahoy! Blimey! I then painted t' entire rocket with a gloss red. Ahoy! Blimey! T' instructions suggest orange, me bucko, but I didn't have any.

Lastly, arrr, t' decals were t' be put on. Ya scallywag! SRW provides an extra "NAVY" decal "so you can practice". Begad! Begad! There were no problems with t' "NAVY" decals, which soaked for about 10 seconds and slide off easily. T' "STARS and BARS" decals, shiver me timbers, me hearties, were another story. After waitin' about t' same amount o' time on t' first one, arrr, I tried to slide it off and it tore in two. Begad! For t' second one, shiver me timbers, me bucko, me hearties, I waited almost 30 seconds in water before it would slide easily. Well, blow me down! Ya scallywag! 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. Begad! Aye aye! T' instructions indicated that it be at least 4.5" from t' aft o' t' rocket. With a C6-5, ya bilge rat, me CG be exactly 4.5". Blimey! With a C6-5, me CG was exactly 4.5". Somethin' went right!

Overall, 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. Arrr! Well, me bucko, I packed t' SLAT/s up for my drive t' NARAM-40, only t' find that a fin had been broken in transit. Unfortunately, matey, I didn't have enough time t' get this repaired and fly at NARAM, since me main focus be gettin' Level 1 certified. Blimey! However, me bucko, matey, 3 weeks later on a beautiful late-summer day, t' SLAT/s be ready t' fly.

Followin' t' list o' recommended motors, matey, t' SLAT/s was loaded with an A8-3 for its first launch. A piece of Rogue Aerospace's Perma- Wadding be attached in place o' t' provided cellulose from the kit.

T' SLAT/s doesn't have a launch lug. Blimey! Blimey! Blimey! Blimey! T' launch rod is placed through one o' t' ramjet slots.

Its maiden voyage was low altitude, considerin' it weighs 2.3 ounces without t' motor and was usin' an A8, but was great t' see the whole flight. Aye aye! Upon ejection, which be before apogee, me bucko, t' parachute did not open. T' descent was horizontal, 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. Blimey! It landed in some tall grass, undamaged.

[Rocket Pic]After, ya bilge rat, shakin' out the parachute and refolding, a B6-4 was loaded for t' second flight. It was also a nice flight t' watch, me hearties, comin' off t' pad that was set up t' about a 20 degree angle. Blimey! Blimey! T' rocket had a slight rotation, which looked like t' ramjet positioned itself t' t' bottom. I'll have t' watch that on some future flights. Blimey! Ejection occurred before apogee and t' parachute deployed and brought the SLAT/s t' t' ground safely. Upon inspection, me bucko, one o' t' shroud lines had pulled loose. Blimey! It looked as if t' sticker was nay firmly pressed down, matey, however, ejection prior t' apogee can put additional stress on t' recovery system.

For t' third flight, shiver me timbers, t' SLAT/s was loaded with a C6-5 and a 14" nylon parachute. Avast, me proud beauty! With t' change t' t' nylon parachute and havin' t' Perma- Wadding and that extra-long shock cord, it was a challenge t' get all o' that stuffed into t' body tube. Begad! Begad! This time t' launch angle be set up vertical and off she went. Begad! Aye aye! Again I could see a slight rotation o' t' rocket. It was nice, arrr, because it reminds me o' flyin' my Estes' SR-71, which I always enjoy how it looks flying. Avast! Well, matey, blow me down! I am pretty sure that deployment be again before apogee. 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, 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, matey, t' SLAT/s is a sharp little flyer providing somethin' more t' look at than 3 fins and a nose cone (3FNC). Arrr! Blimey! I would almost recommend only flyin' it on A's and B's so you can see t' whole flight. Aye aye! Blimey! Blimey! Blimey! It is also a great buildin' kit for those that like t' spend time buildin' a more detailed kit. Well, blow me down! Blimey! Begad! Blimey! I give t' kit an OVERALL ratin' o' 4 1/2 points.

Note: This kit be reviewed when produced by Seattle Rocket Works which has transferred rights t' LawnDart Rocketry.

Flights

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