West Coast Rocketry Screamer II

West Coast Rocketry - Screamer II {Kit}

Contributed by John Lee

Construction Rating: starstarstarstar_borderstar_border
Flight Rating: starstarstarstarstar
Overall Rating: starstarstarstarstar_border
Manufacturer: West Coast Rocketry
(OOP) West Coast Rocketry Screemer 2

Brief:
This is a 4FNC rocket designed t' fly on 29mm E-H power and has parachute recovery and payload bay.

On eBay, I found a group o' rockets from t' defunct West Coast Rocketry. Ya scallywag! I put a bid in on all o' them and "won" only t' mid power ones. Avast, me proud beauty! This be t' first one I have gotten around t' tryin' t' build.

Construction:
There is much about this kit that is minimalist. Arrr! Blimey! That includes t' packaging. Begad! Avast, me proud beauty! All o' t' components were in a clear plastic bag stapled at one end. Well, ya bilge rat, blow me down! They appeared t' be in good shape and consisted of:

  • Motor tube
  • 2 centerin' rings
  • plywood bulhead
  • 4 plywood fins
  • 1/4" launch lug
  • 2 18" body tubes
  • a payload bay
  • a turned balsa nosecone
  • 2 couplers
  • an eye screw
  • a parachute kit
  • an instruction sheet that brings new meanin' t' "minimalist"

(OOP) West Coast Rocketry Screemer 2(OOP) West Coast Rocketry Screemer 2
(OOP) West Coast Rocketry Screemer 2(OOP) West Coast Rocketry Screemer 2

T' first step in t' instructions was t' epoxy t' centerin' rings 1/8" from either end o' t' motor tube. T' rings fit perfectly and needed no sanding. T' gluin' be done with 5 minute epoxy. Arrr! When it had set up, matey, arrr, I epoxied the other side and put in a good fillet.

(OOP) West Coast Rocketry Screemer 2 T' next specified step was t' mark the body tube for fins and then install t' motor tube in t' aft end. Aye aye! Aye aye! I wanted t' epoxy t' have a better chance to harden so I skipped t' t' next step which was t' join t' two body tubes with a coupler. Arrr! Again, epoxy was specified. Aye aye! Ya scallywag! I swabbed in t' epoxy t' one end o' a BT and then inserted a coupler t' t' halfway point.

T' centerin' rings that fit so well around t' motor mount needed some work t' fit into t' body tube. Begad! Sanding the perimeter eventually got a smooth fit. Well, blow me down! Before installin' t' motor mount, me bucko, though, me hearties, I decided t' fashion a Keelhaul®©™® recovery system around t' mount.

Presumably, this be nay t' intent o' West Coast Rocketry, matey, although I really have no idea what kind o' recovery system they envisioned. Ya scallywag! Begad! Blimey! T' kit comes with a fairly generous piece o' 1/4" sewin' elastic but t' instructions are silent on t' issue. Ya scallywag! T' only mention is several steps down where it says, "install your recovery system". Ya scallywag! Avast, me proud beauty! Blimey! As I said, shiver me timbers, t' directions are minimal.

I tied a piece o' Keelhaul®©™® long enough t' run through both BTs around t' motor mount near t' forward end. Ya scallywag! I then cut a notch on t' outside of the rin' in order t' pass t' Keelhaul®©™® through. Aye aye! Before installin' t' mount though, ya bilge rat, I pushed t' Keelhaul®©™® down around t' ring, shiver me timbers, shiver me timbers, got t' standin' end lined up with t' notch and filleted it in place around t' rin' with yellow glue.

While t' glue was settin' up, I took a closer look at t' fins. They were o' good quality plywood and I decided to round off their leading, ya bilge rat, trailin' and outside edges. Avast, me proud beauty! I did this by t' expedient method o' settin' each fin in a vise and then usin' a strip o' 150 grit sandpaper t' take t' edges off, matey, workin' them back and forth like a shoe shine rag. Well, blow me down! I found that I got better results if I did nay pull down but on one side at a time. Aye aye! Avast, me hearties, me proud beauty! I held t' other end perpendicular t' t' plane o' t' fins. Arrr! Arrr! After doin' a dozen or so strokes, I would make t' other side "down". This did nay result in a perfect job but it was good enough for me.

T' fins took a while so t' glue on t' Keelhaul®©™® was dry enough t' work with when I got back t' t' motor mount. Blimey! I placed t' Keelhaul®©™® in t' notch and tied a ballpoint pen t' t' far end o' it. Begad! I then used t' weight o' t' pen t' pass t' Keelhaul®©™® through t' first BT. When that was done, I mixed up another batch o' 5 minute epoxy and used a long swab t' place a rin' around t' interior o' t' BT about 6" in. Arrr! Blimey! I placed me foot on t' far end o' t' Keelhaul®©™® and made sure t' other end was in t' notch o' t' first centerin' ring. Avast, me proud beauty! Then usin' me foot t' keep t' Keelhaul®©™® under tension I slid t' mount in about half way. Well, me hearties, blow me down! Blimey! Another rin' o' epoxy was then placed right inside t' aft end o' the BT and always maintained tension. Avast! Blimey! I slid t' motor tube t' rest o' t' way in until t' aft end o' t' motor tube was flush with t' aft end o' t' BT. Avast! Blimey! I then turned t' assembly upright t' cure. Avast! Blimey! After about 10 minutes, I turned it over and applied an epoxy fillet t' t' joint betwixt t' BT and t' centerin' rings.

Next up was t' joinin' o' t' two body tubes. Begad! I fed t' Keelhaul®©™® down t' upper tube and then laid t' two side by side. I mixed up some 5 minute epoxy and swabbed t' interior o' the upper tube and t' aft end. Avast, me proud beauty! Then, ya bilge rat, keepin' tension on t' Keelhaul®©™®, I slid t' two pieces together and ensured they were straight.

T' instructions give no markin' guide o' any type for t' fins and say only t' locate them 120 degrees apart. Since this rocket is too heavy for me Art Rose jig and did nay seem t' correspond t' any o' t' BTs on me Estes alighment jig, shiver me timbers, I decided t' make me own wraparound usin' VCT. Ya scallywag! This be t' first time I have actually used that software. Avast! Ahoy!

T' input needed for t' software was t' BT diameter, matey, shiver me timbers, t' length o' t' fins, ya bilge rat, t' number o' fins, ya bilge rat, me hearties, t' spacing (equidistant) o' t' fins and t' thickness o' t' fins. T' result was a wraparound template that fit perfectly and which gave nay only t' centerlines o' t' fins but t' outside edges as well. Begad! Since this kit required t' cuttin' of slots for t' fins, it be very helpful.

T' instructions did nay indicate how far forward t' fins were supposed t' be located. Avast, me proud beauty! Blimey! Since thar was no picture o' t' completed rocket, I just had t' guess. I assumed they were nay t' be flush with t' aft end since the slots had t' be cut and that would interfere with t' aft centerin' ring. Well, blow me down! Blimey! For some reason, ya bilge rat, I did nay even think of interference with t' forward centerin' ring. Aye aye! Blimey! T' me eye, t' extra paper on t' aft end o' t' fin guide looked just about right so I decided t' go with that distance. As I was t' learn, that meant I just barely cleared t' forward centerin' ring.

This be t' first time I had ever had t' cut fin slots in a rocket. Avast! Well, arrr, blow me down! T' instruction provided no guidelines so I made up t' procedure as I went along. Blimey! I had t' guide taped where I wanted it and then started t' lightly draw a razor knife over t' fin edge marks on t' guide. Begad! With each pass I cut a bit deeper into t' BT and finally, shiver me timbers, I had t' slot cut out. Ya scallywag! It wasn't pretty but it would have t' do. Arrr! Well, blow me down! I evened up t' edges just a bit by runnin' a sandin' stick through the slots. This removed t' major bumps. Avast! Blimey! T' process was repeated for t' remainin' 2 fins.

In order t' let me nerves recover some what from t' process o' cuttin' t' slots, ya bilge rat, I did nay immediately mount the fins. Ahoy! Blimey! Instead, ya bilge rat, I got t' work on t' payload bay.

A pre-drilled plywood bulkhead is supplied which is supposed t' be mounted in t' remainin' tube coupler. Unlike the centerin' rings, ya bilge rat, this was not a good fit. Ya scallywag! It slipped into t' coupler and when centered did nay quite touch the tube anywhere. Aye aye! Groaning, matey, I screwed t' eye screw into t' bulkhead and then made up another batch o' 5 minute epoxy. Blimey! I liberally coated t' entrance t' one end o' t' tube and used t' eye screw t' push t' bulkhead in. Ahoy! I then held it in place until t' epoxy had set up enough t' hold it. Well, blow me down! It was still a tenuous connection. Aye aye! I mixed another cup of epoxy and poured t' whole thin' into t' aft end o' t' tube. I used a stick t' smooth it out and when cured, arrr, ya bilge rat, now have no worries about t' bulkhead holding. A bit more epoxy saw t' coupler into t' payload bay.

Gettin' back t' t' fins, I was in a quandary. Well, blow me down! I did nay believe t' fins were t' be affixed t' t' motor mount; their shape be wrong for that. T' fact was, I did nay no how deep t' set t' fins. Arrr! Blimey! I finally decided that t' slot was t' provide a shearin' surface and that t' fins were just t' be inserted t' thickness o' t' BT. Ahoy! Blimey! I made up another batch o' epoxy and slathered it into t' slot and then set t' fin in place. Begad! I had t' work it a little t' get it t' an even depth which was probably a good thing. Arrr! That meant that t' epoxy was startin' t' stiffen when I was ready t' let go. I used me deadlights t' get t' alignment right and then let it set for a while before progressin' t' t' next fin.

T' fillet t' fins, ya bilge rat, I used 12 minute epoxy. I tried usin' maskin' tape t' form "dams" and poured the epoxy into t' grooves and used a popsicle stick t' smooth it out. Blimey! Just as it would start t' set up stiff, shiver me timbers, I peeled the tape away. T' results are nay as perfect as I would like but they are definitely better than me first method.

PROs: Easy design

CONs: Inadequate instructions

Finishing:
After completin' t' assembly, this rocket sat around for a few days as I dealt with "real life". Ya scallywag! Ya scallywag! It came to t' forefront again when I learned that I had a rare launch window for bigger stuff in a week's time and I rushed over t' me build facility thinkin' I wanted t' have this one ready.

(OOP) West Coast Rocketry Screemer 2 I set t' rocket up in me booth without botherin' t' look at it closely and started sprayin' with Kilz. Begad! Then I took a closer look at t' nosecone and realized that I had nay sealed it or t' fins. Begad! I figured t' fins are plywood and t' Kilz will seal that alright. Avast! I'll have t' see what happens with t' NC.

As it happens, t' Kilz did an adequate job o' fillin' t' grain on t' balsa nose cone. After sanding, shiver me timbers, arrr, I gave it a second coat o' Kilz and let that dry. Ahoy! I sanded again and found that t' finish, while nay perfect is good enough especially in light o' some o' t' other cosmetic defects present on this rocket as a result on me sloppily applied epoxy.

I pondered for a while what kind o' paint scheme I was goin' t' use. Ya scallywag! Blimey! I looked through me rattle cans and saw two that had nay been used before. Begad! Blimey! Begad! Blimey! One was John Deere green and t' other was John Deere Yellow. Aye aye! Blimey! That gave me an idea. Avast, matey, me proud beauty! Blimey! I have a WCR Screamer I still sittin' in t' package. Begad! Blimey! I decided t' give this one a John Deere paint job, ya bilge rat, green with yellow trim and call it "John Deer". T' other one will get t' reverse paint job, yellow with green trim, and be called "Jane Doe".

I painted t' yellow first, shiver me timbers, shiver me timbers, nay payin' attention t' maskin' since all else would be covered by t' green. Begad! I painted t' nosecone, payload bay and fins yellow.

After t' yellow had dried. Ahoy! Avast! I masked off t' fins and t' BT from t' payload bay on up and hit it with the green. Arrr! When t' tape came off, me hearties, it does look like somethin' that belongs out at t' ranch.

After t' paint had dried, I used a razor t' scrape away a line o' paint coincidin' with t' tube couplers. Ahoy! I then used some sandpaper t' rough up t' bare patch. Aye aye! I mixed a small bit o' 5 minute epoxy and applied it t' t' back of a Public Missiles linear rail lug. Arrr! T' lug was then pressed into place. Ahoy! As t' epoxy was settin' up, I further secured t' lug with a pair o' #6-1/2" flathead screws. Aye aye! Begad! Blimey! I then considered t' rocket t' be ready for action.

Construction Rating: 3 out o' 5

(OOP) West Coast Rocketry Screemer 2

Flight:
T' maiden flight o' t' Screamer II, shiver me timbers, matey, AKA John Deere, arrr, was at t' August 2008 Freedom Launch hosted by t' Amateur Rocketeers o' Texas. Avast, me proud beauty! Since I was pretty much on me own as far as determinin' a suitable motor, I looked t' see what I had. Blimey! I came up with a Roadrunner F45-5.

I loaded t' rocket up on t' rail, me hearties, gave t' warning, ya bilge rat, counted down and pushed t' button. Aye aye! It immediately started up and then halted for just a moment before screamin' skyward. Blimey! Begad! I though that, perhaps, t' launch rail had a kink in it but it be me that was kinked.

Although t' rocket flew fine and high, arrr, a post-mortem revealed that I had messed up big time. Avast, me proud beauty! In an effort to keep t' igniter from slippin' out, I often use a piece o' tape. Arrr! I did t' same thin' this time but with a difference. Without thinking, me hearties, shiver me timbers, I taped an S-curve into t' igniter and taped it firmly. Aye aye! Ya scallywag! When t' rocket took off, it be tryin' to take t' control wires along with it.

Still, ya bilge rat, t' flight itself was a good one. Ahoy! Ahoy! It be straight and t' rocket landed a reasonable distance away.

(OOP) West Coast Rocketry Screemer 2 T' second flight be on a Roadrunner G80-7. It was hooked up t' same way but with much less tape t' hold t' igniter in place and put on t' rail. Avast! Aye aye! When the button was pushed, as far as I could tell t' rocket simply ceased t' be there. Others were trackin' it however, shiver me timbers, arrr, and began t' express some concern that it would pass out o' sight, shiver me timbers, me hearties, even though it went straight up and t' rocket is close to 5 feet long. Avast, me proud beauty! I got kind o' miffed that I could nay spot me own rocket and actually had time t' start and complete a few jokes before somebody said, matey, "There it is!"

I did manage t' catch sight o' it before it touched down. Ya scallywag! Blimey! Avast, me proud beauty! Blimey! I was a long way away, me bucko, almost out o' bounds...on a G motor in a field that handles Js.

I didn't feel like so much exercise again that day so I put it away.

PROs: flies very well

CONs: none

Recovery:
T' rocket came with a 24" ripstop nylon parachute. Begad! Blimey! It was attached via 6' o' elastic and 4' o' Keelhaul®©™® to t' motor mount. Avast! I used a Nomex® shield in place o' waddin' and t' system worked well. Blimey! Blimey!

Flight Rating: 5 out o' 5

(OOP) West Coast Rocketry Screemer 2

Summary:
I think this is actually a pretty good rocket but I would nay recommend it t' anyone who has nay built in this size range before because o' t' inadequacy o' t' instructions. Ya scallywag! I think a reasonably competent person could figure it out but it would be safer t' do t' learnin' with a smaller rocket or one with better instructions. Well, blow me down! Still, arrr, its a great flier and I'm glad t' have it.

Overall Rating: 4 out o' 5

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