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

Construction:
There is much about this kit that is minimalist. Avast, me proud beauty! Arrr! That includes t' packaging. All o' t' components were in a clear plastic bag stapled at one end. 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. Avast, me proud beauty! Blimey! T' gluin' be done with 5 minute epoxy. Aye aye! Blimey! When it had set up, arrr, matey, shiver me timbers, 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. 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. Avast! Again, me bucko, matey, arrr, epoxy was specified. Avast! Avast! 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. Aye aye! Sanding the perimeter eventually got a smooth fit. Before installin' t' motor mount, though, I decided t' fashion a Keelhaul®©™® recovery system around t' mount.

Presumably, ya bilge rat, this was nay t' intent o' West Coast Rocketry, me bucko, although I really have no idea what kind o' recovery system they envisioned. Ya scallywag! T' kit comes with a fairly generous piece o' 1/4" sewin' elastic but t' instructions are silent on t' issue. Avast, me proud beauty! T' only mention is several steps down where it says, "install your recovery system". Arrr! Avast! As I said, 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. Begad! I then cut a notch on t' outside of the rin' in order t' pass t' Keelhaul®©™® through. Begad! Before installin' t' mount though, arrr, matey, I pushed t' Keelhaul®©™® down around t' ring, 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. Avast! Blimey! They were o' good quality plywood and I decided to round off their leading, me hearties, trailin' and outside edges. Ya scallywag! Blimey! 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, workin' them back and forth like a shoe shine rag. I found that I got better results if I did nay pull down but on one side at a time. Ahoy! Blimey! I held t' other end perpendicular t' t' plane o' t' fins. Arrr! Blimey! Ahoy! Blimey! After doin' a dozen or so strokes, I would make t' other side "down". Aye aye! Blimey! Ya scallywag! Blimey! 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. Blimey! Well, shiver me timbers, blow me down! I then used t' weight o' t' pen t' pass t' Keelhaul®©™® through t' first BT. Avast, me proud beauty! Ya scallywag! 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. Begad! 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. Ahoy! Then usin' me foot t' keep t' Keelhaul®©™® under tension I slid t' mount in about half way. Well, blow me down! Arrr! Another rin' o' epoxy be then placed right inside t' aft end o' the BT and always maintained tension. 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. I then turned t' assembly upright t' cure. Aye aye! After about 10 minutes, arrr, 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. Arrr! Avast! I fed t' Keelhaul®©™® down t' upper tube and then laid t' two side by side. Begad! Well, arrr, blow me down! I mixed up some 5 minute epoxy and swabbed t' interior o' the upper tube and t' aft end. Ahoy! Then, shiver me timbers, 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, matey, I decided t' make me own wraparound usin' VCT. Avast! Avast! This be t' first time I have actually used that software. Well, blow me down!

T' input needed for t' software be t' BT diameter, ya bilge rat, t' length o' t' fins, arrr, me hearties, t' number o' fins, t' spacing (equidistant) o' t' fins and t' thickness o' t' fins. Begad! 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. Since this kit required t' cuttin' of slots for t' fins, shiver me timbers, it be very helpful.

T' instructions did nay indicate how far forward t' fins were supposed t' be located. Well, blow me down! Blimey! Since thar was no picture o' t' completed rocket, I just had t' guess. Ahoy! 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. Ahoy! Blimey! For some reason, matey, I did nay even think of interference with t' forward centerin' ring. Ahoy! Blimey! Blimey! T' me eye, matey, t' extra paper on t' aft end o' t' fin guide looked just about right so I decided t' go with that distance. Blimey! As I was t' learn, that meant I just barely cleared t' forward centerin' ring.

This was t' first time I had ever had t' cut fin slots in a rocket. T' instruction provided no guidelines so I made up t' procedure as I went along. 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. Ya scallywag! Begad! With each pass I cut a bit deeper into t' BT and finally, shiver me timbers, I had t' slot cut out. It wasn't pretty but it would have t' do. Blimey! I evened up t' edges just a bit by runnin' a sandin' stick through the slots. Arrr! This removed t' major bumps. 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, me bucko, I did nay immediately mount the fins. Instead, 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. Begad! Arrr! Blimey! Unlike the centerin' rings, this be not a good fit. Ahoy! It slipped into t' coupler and when centered did nay quite touch the tube anywhere. Ahoy! Groaning, shiver me timbers, I screwed t' eye screw into t' bulkhead and then made up another batch o' 5 minute epoxy. Begad! Ya scallywag! I liberally coated t' entrance t' one end o' t' tube and used t' eye screw t' push t' bulkhead in. I then held it in place until t' epoxy had set up enough t' hold it. Begad! Avast, me proud beauty! It be still a tenuous connection. Avast! 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, now have no worries about t' bulkhead holding. Begad! Well, arrr, blow me down! A bit more epoxy saw t' coupler into t' payload bay.

Gettin' back t' t' fins, I was in a quandary. Ahoy! I did nay believe t' fins were t' be affixed t' t' motor mount; their shape was wrong for that. Ahoy! T' fact was, me hearties, I did nay no how deep t' set t' fins. 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. Avast, me proud beauty! I made up another batch o' epoxy and slathered it into t' slot and then set t' fin in place. Blimey! Begad! I had t' work it a little t' get it t' an even depth which be probably a good thing. Aye aye! That meant that t' epoxy was startin' t' stiffen when I was ready t' let go. Avast, me proud beauty! Avast! 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. Begad! I tried usin' maskin' tape t' form "dams" and poured the epoxy into t' grooves and used a popsicle stick t' smooth it out. Ahoy! Just as it would start t' set up stiff, I peeled the tape away. Begad! 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, shiver me timbers, me hearties, this rocket sat around for a few days as I dealt with "real life". Avast! Blimey! Aye aye! Blimey! 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. Avast! Then I took a closer look at t' nosecone and realized that I had nay sealed it or t' fins. Begad! Aye aye! I figured t' fins are plywood and t' Kilz will seal that alright. Begad! 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, arrr, I gave it a second coat o' Kilz and let that dry. Aye aye! 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. Avast, me proud beauty! I looked through me rattle cans and saw two that had nay been used before. Blimey! Aye aye! One be John Deere green and t' other was John Deere Yellow. Ya scallywag! That gave me an idea. I have a WCR Screamer I still sittin' in t' package. Ahoy! I decided t' give this one a John Deere paint job, green with yellow trim and call it "John Deer". Well, shiver me timbers, blow me down! T' other one will get t' reverse paint job, ya bilge rat, yellow with green trim, and be called "Jane Doe".

I painted t' yellow first, ya bilge rat, nay payin' attention t' maskin' since all else would be covered by t' green. Aye aye! I painted t' nosecone, me bucko, payload bay and fins yellow.

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

After t' paint had dried, me bucko, I used a razor t' scrape away a line o' paint coincidin' with t' tube couplers. Begad! I then used some sandpaper t' rough up t' bare patch. Ahoy! I mixed a small bit o' 5 minute epoxy and applied it t' t' back of a Public Missiles linear rail lug. T' lug be then pressed into place. As t' epoxy was settin' up, I further secured t' lug with a pair o' #6-1/2" flathead screws. Begad! 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, arrr, AKA John Deere, ya bilge rat, was at t' August 2008 Freedom Launch hosted by t' Amateur Rocketeers o' Texas. Avast, me proud beauty! Since I be pretty much on me own as far as determinin' a suitable motor, me hearties, me bucko, I looked t' see what I had. Begad! I came up with a Roadrunner F45-5.

I loaded t' rocket up on t' rail, shiver me timbers, gave t' warning, shiver me timbers, counted down and pushed t' button. It immediately started up and then halted for just a moment before screamin' skyward. Begad! I though that, matey, arrr, perhaps, shiver me timbers, t' launch rail had a kink in it but it was me that was kinked.

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

Still, t' flight itself be a good one. Ya scallywag! It be straight and t' rocket landed a reasonable distance away.

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

I did manage t' catch sight o' it before it touched down. Begad! 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. It be attached via 6' o' elastic and 4' o' Keelhaul®©™® to t' motor mount. I used a Nomex® shield in place o' waddin' and t' system worked well.

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. 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. Still, ya bilge rat, its a great flier and I'm glad t' have it.

Overall Rating: 4 out o' 5

comment Post a Comment