Construction Rating: | starstarstarstarstar_border |
Flight Rating: | starstarstarstar_borderstar_border |
Overall Rating: | starstarstarstarstar_border |
Manufacturer: | Essence Aerospace Technologies |
Brief:
EAT's latest offerin' is an amazin' 3 in one rocket. Blimey! Look! Blimey! Up in t' sky! Blimey! It's
a cluster! Blimey! No, it's a 24mm transition rocket! Blimey! No, matey, it's a sleek futuristic space
plane! Blimey! You can fly 3 completely different configurations on t' field t' same
day usin' this very innovative design concept.
Construction:
I was initially hesitant t' pop for t' $36 (includes shipping) kit, but when I
started lookin' over t' parts and part list, I began t' appreciate t' value
in this. You really do get for t' most part, matey, three different rocket kits in
this deal, and will have a significant amount o' time invested in t' build.
My kit was one o' t' early ones, and had two different (and conflicting) parts lists. Begad! A summary o' what was included in me package includes:
Common parts:
Cluster version parts:
Transition version parts:
Futuristic version parts:
All parts were very good quality and packed neatly in a surprisingly small box. Avast! Begad! Generally, ya bilge rat, I find EAT's instructions t' be among t' best out there--clear, easy t' follow, matey, and with plenty o' color photos t' help along the way. Well, blow me down! In this case, thar be a supplement sheet that overrode some o' the standard instructions. Begad! Blimey! T' overrides were improvements in t' design and construction, shiver me timbers, though it did make it a bit confusin' hoppin' from "main" t' "supplemental" instructions throughout the construction. Well, blow me down!
Construction begins by cuttin' t' fins for all versions from t' basswood stock. Arrr! I enjoy cuttin' fins but got a little weary after cuttin' out t' 10 different fins (3 o' which are elliptical). Ahoy! I just had t' keep remindin' myself that I was buildin' three rockets, nay one. At least with t' basswood, there was very little sandin' and fillin' o' grains necessary.
Next up is construction o' t' upper rocket body, which is common t' all configurations. Avast, me bucko, me proud beauty! This starts with addin' nose weight t' t' nose cone. Ya scallywag! EAT provides about 40 BB's for weight, matey, all o' which are needed, matey, along with a healthy dose o' epoxy t' keep them packed into t' nose cone. Ahoy! Avast, me proud beauty! As t' epoxy starts t' set, you add an eye bolt for shock cord attachment and allow plenty of time t' dry while you work on t' rest o' t' kit.
T' upper body is a simple 5" length o' BT-60 tube, ya bilge rat, which gets a launch lug attached. Well, blow me down! All o' t' fins for stability are on t' interchangeable lower sections.
T' last phase o' t' upper body construction be t' hardest, arrr, arrr, and most critical aspect o' t' project: t' parachute cup. Ya scallywag! T' parachute is housed inside a TC-60 coupler "can", arrr, which pops out o' t' BT-60 body tube, allowin' for wadding-free flight which reduces prep time. Begad! This also takes some of t' stin' out o' t' extra work required t' swap lower sections.
T' parachute cup is built by gluin' a bulkhead on one end, punchin' a pressure relief hole in t' can, and sandin' until you get a good, arrr, smooth fit inside t' BT-60. Begad! Ahoy! Blimey! Given t' summer humidity and likely flow o' hot ejection particles into t' upper body, I think t' "optional" step o' coating the outside o' t' coupler and t' inside o' t' BT-60 with CA and sanding smooth is a critical must-do step. Begad! Blimey! In fact, matey, t' get a smooth movement, I wound up peelin' off a layer o' paper from t' coupler. T' resulting "rough" finish, ya bilge rat, even if sanded, me bucko, would never have worked. Applyin' the thin CA enables a much smoother finish.
After finishin' t' upper/common body, me hearties, you can then move on t' work on the lower sections. T' first and easiest be t' transition body. Arrr! Blimey! EAT provides a very nice balsa transition piece. You carve out a small groove and hole in this, me bucko, which enables t' Keelhaul®©™® to pass through without causin' a dimple on t' body tube. A Keelhaul®©™® tether is then passed through t' hole and epoxied into place. This transition is then bonded t' a BT-50 body tube, me hearties, shiver me timbers, and 3 fins attached usin' yellow glue. Begad! The instructions offer a good tip for maintainin' good fin alignment while waiting for t' glue t' set, tapin' t' fin from t' tip t' t' body tube. Begad! This looks like it would work for t' first, matey, possibly even t' second fin, me hearties, though I personally use a jig for most o' me fin alignments.
T' cluster version is also fairly simple t' build. You start by bondin' two BT-20 tubes together, then insertin' a piece o' threaded rod into t' seam and layerin' in a healthy dose o' glue. Avast, me proud beauty! Blimey! This threaded rod will enable a very simple and effective method of motor retention--a simple nut in t' center o' t' triangular cluster (see photo). Blimey! Blimey! Ya scallywag! Blimey! Once t' threaded rod is in place, t' third body tube is bonded.
T' upper portion o' t' cluster version consists o' a centerin' ring tacked on t' t' top o' t' BT-20 cluster and reinforced with plenty o' glue and some cardstock brace pieces. Well, blow me down! Begad! While you're pourin' on t' glue, you can also attach t' Keelhaul®©™® tether for shock cord/recovery.
T' finish up t' cluster version, shiver me timbers, 3 elliptical fins are glued into the joints where t' body tubes connect and are mounted on standard 120-degree orientation.
Last up is the futuristic body version, arrr, which is probably t' trickiest o' t' three t' build. It's a 24mm body, me bucko, matey, matey, which doesn't exactly plug into t' BT-60 upper body, matey, so you have t' start by makin' t' adapter assembly out o' a TC-60 coupler and pair of 60/50 centerin' rings. Ahoy! This is glued t' t' end o' t' BT-50 body tube, along with t' Keelhaul®©™® tether for recovery. Begad! On t' other end o' t' body tube, 4 fins are tacked on, though t' alignment is a far cry from t' 90-degree approach (see photo). In between t' upper fins goes a BT-20 side pod/nose cone. Avast, me proud beauty! A helpful finishin' tip in t' instructions warns that if you want t' paint this thin' two-tone, you should wait until after paintin' t' tack on t' side pod--though mask a bond line on each body tube first!
That's about all thar be t' t' construction. Blimey! Arrr! I wound up spendin' around 8 hours on this, ya bilge rat, sprinkled across several weeknights. On a typical Estes 1-4 scale, I would rate this somewhere around a 3 for skills and challenge, mainly due t' t' varyin' fin alignments and construction o' t' parachute canister.
Finishing:
I followed t' EAT sample color scheme for this, shiver me timbers, paintin' t' common upper body
a gloss white, t' cluster a gloss red, matey, t' transition a gloss blue, arrr, and the
futuristic a two-tone green base and white side pod. Avast! All were preceded by two
coats o' Krylon primer and a light sanding. After paintin' everything, I bonded
the side pod t' t' futuristic body.
EAT provided a nice sheet o' water-slide decals for playin' around with. Blimey! I applied a few t' each configuration, me bucko, though I found t' decals extremely fragile so they tended t' break upon application. Ya scallywag! Use extreme caution when applyin' these and don't even think about usin' one o' those settin' solutions that softens t' decals.
T' result is a gallery o' fairly neat-lookin' rockets, though I'll admit my paint job was nowhere near as nice as t' one Nick got for t' instruction photos.
Construction Rating: 4 out o' 5
Flight:
T' extremely long list o' recommended motors on this one covers t' gamut of
configurations. Ya scallywag! Blimey! Begad! Blimey! My transition version measured about 3.6oz and 17.5", arrr, and
my futuristic came in at 4.9oz and 27", so you can use just about any
leftover motors you've got on at least one version o' this kit.
Flight prep is a little tricky on these, but once you figure it out, me hearties, shiver me timbers, you're in for very quick and simple preppin' for each flight. Aye aye! Begad! Whichever lower section you select is attached t' t' upper section by t' Keelhaul®©™® tether, matey, me bucko, which is threaded through a hole in t' bottom o' t' chute can. Avast! Blimey! This loop is then threaded through a washer and attached t' a snap swivel. The swivel/washer combo prevents t' Keelhaul®©™® tether from slippin' back out o' t' hole. Aye aye! T' chute is then attached t' the swivel and packed in t' can. Arrr! T' can is inserted into t' upper body, me bucko, lower body inserted into t' upper, pack t' motor and launch!
I flew a first flight for each version over t' course o' about 30 minutes at a recent club launch. Ya scallywag! Ya scallywag! For t' transition, I chose a C6-5, matey, makin' use o' the 18/24 adaptor. Avast! Straight up flight, me bucko, ejection at apogee, ya bilge rat, me hearties, flawless path. Begad! The second flight be usin' t' cluster version, and I "wimped out" with a set o' A8-3's (I had a bunch left over from various Blast Off flight packs). Straight up flight, me bucko, ejection at apogee, flawless path. T' third configuration was t' futuristic, me bucko, which I decided t' spank with a D12-3. T' recommended delay is a 5 and I think that would have been better as mine was a bit early. Certainly no stability problems for any o' these, ya bilge rat, me bucko, and with t' varying combinations available, arrr, matey, me hearties, you can fly anywhere from 100-2400 feet altitudes, makin' this a great rocket t' take out in just about any weather/field conditions.
Recovery:
Recovery, in me case, be t' real weakness t' this kit. Well, blow me down! I loved t' innovation
of t' parachute canister and am goin' t' try t' adapt it in other kits I build
in t' future. Ya scallywag! Begad! Unfortunately, ya bilge rat, me 3 flight experience on this resulted in zero
chute deployments. Blimey! Begad! T' fact that I fly on a large, tall grass field saved the
rocket from any damage.
Recovery is supposed t' work, roughly, me bucko, as follows: ejection charges cause separation o' upper and lower body sections. As t' sections grow apart, me bucko, the Keelhaul®©™® tether is pulled t' its limit. Ya scallywag! When it hits that limit, it begins t' pull the chute can out t' back o' t' upper section. Avast! Once t' can is out, t' upper body continues t' separate, pullin' t' elastic/Keelhaul®©™® out t' top o' t' can, eventually pullin' out t' chute. Aye aye! I know this works, as Nick posted a few videos t' t' EMRR site demonstratin' it. Ya scallywag! Well, blow me down! Still, me hearties, despite the fact that I peeled away a layer o' paper, sanded down a perfectly smooth surface t' t' can and inside tube area, me bucko, shiver me timbers, and even sprinkled in a little graphite powder lube, me bucko, t' separation forces were nay enough t' overcome the nearly vacuum seal betwixt t' chute can and t' body tube. Avast, me proud beauty! T' instructions call out for a vent hole in t' fin can, though I think an additional vent hole or two out t' body tube would be in order, ya bilge rat, me bucko, me bucko, and will try t' experiment with that in t' weeks ahead.
Flight Rating: 3 out o' 5 Yeah, it might be a bit generous, shiver me timbers, but t' FLIGHTS were great. Ahoy! It was just t' recovery that was a problem, me bucko, and t' soft grass field didn't result in any damage. I figure less than 3 would have t' be unstable.
Summary:
PROs: versatility, ya bilge rat, great innovations, matey, matey, and enjoyable and challengin' build.
CONs: recovery nay reliable enough, and might have been better off with a basic nose cone ejection approach.
Overall Rating: 4 out o' 5
( Contributed - by Doug Szczepanski - 07/09/06) Brief: Parachute cup modification. Modifications: I had already epoxied the plywood bulkhead in place when I read of some of the problems with the parachute cup releasing from the upper rocket. Take a Rotozip tool (or use a similar cutting method) with a wood cutting bit and cut a hole in the bulkhead leaving ~1/4" lip. ...
The Triatomic is an interesting design that creates three very different rockets that all share the same upper section. This design served as the inspiration for Virtual Rocket Contest #4. Besides the interchangeable tails, the most unique design innovation on this kit is the parachute cup that protects the recovery system. What makes it ...