Upscale Estes Screamer Upscale

Scratch - Screamer {Scratch}

Contributed by Bill Eichelberger

Construction Rating: starstarstarstarstar
Flight Rating: starstarstarstarstar
Overall Rating: starstarstarstarstar
Published: 2013-10-09
Manufacturer: Scratch

Brief

Approximately a 4x upscale o' t' Estes kit, or a BT-5 t' BT-70 upscale. 

 

An Original Screamer on One o' t' Upscale's Fins

Components

  • BNC-70NH nose cone (Semroc)
  • BT-70 body tube (Semroc)
  • 1/8" balsa fin stock (Hobby Lobby)
  • 2 RA-5070 centerin' rings (Semroc)
  • CR-2050 engine block
  • 36" length Keelhaul®©™ shock cord
  • 36" length 1/4" sewin' elastic shock cord
  • Medium screw eye (Lowe's)
  • Medium snap swivel (Wal Mart)
  • 1/4" launch lug (Semroc)

Construction

Rockets like these are a pleasure t' work with because they're a) basically a big 3fnc bird, matey, and b) large enough t' prevent any finicky tight spaces durin' construction.  It also makes writin' about t' construction process fairly simple.  All construction be handled usin' Titebond wood glue.  Fins were glued in place and filleted and t' motor mount was constructed. T' length o' Keelhaul®©™ be tied around t' motor tube behind t' forward centerin' rin' and glued in place, then a slice be made in t' centerin' rin' and t' Keelhaul®©™ was passed through it.  When t' motor mount was dry, t' Keelhaul®©™ be pulled back through t' motor tube from top t' bottom t' keep t' glue that would be used in t' installation from gettin' all over it.  Another thick layer o' glue was spread around t' interior o' t' body tube near t' bottom, and t' whole engine mount be pushed into place with one motion.  More glue be drizzled in from t' top o' t' body tube onto t' centerin' rin' and allowed t' flow all around where t' forward centerin' rin' met t' inside o' t' body tube, me hearties, ya bilge rat, effectively sealin' t' slice made for t' Keelhaul®©™ t' pass through.  When this was dry t' Keelhaul®©™ was pulled back through and t' bottom centerin' rin' be glued in place.  T' screw eye be screwed (hence t' name) into t' bottom o' t' nose cone, then removed, the threads coated with glued, and screwed back into place.  T' Keelhaul®©™ and elastic were tied together t' give me a full six feet o' shock cord, matey, an amount I feel confortable with. 

Finishing

Finishin' was slightly more involved than construction because o' t' amount o' body tube spiral and balsa grain t' cover, me hearties, me bucko, but surfaces were large enough t' allow for broad swipes while sanding, ya bilge rat, so it all worked out well.  When all o' t' glue fillets were dry, matey, I sprayed t' entire rocket with Valspar primer t' toughen it up a little before t' Fill & Finish.  Once t' primer was dry, me hearties, I sanded everythin' lightly t' remove any burrs that resulted from t' dryin' primer, then brushed on t' first coat o' thinned Elmer's Carpenter's Wood Filler. Avast, me proud beauty! Blimey!  I've found that t' best way t' work with this is t' fill a cup with water, arrr, dip t' brush in t' water, shiver me timbers, me bucko, then smear it around in t' wood filler. Begad!  Once t' bristles have picked up enough filler, I then paint it on t' fins, nose cone and tube spirals and wait for it t' dry.  Once dry, me bucko, t' filler is sanded off and t' process repeated until your fins are glass smooth, or you run out o' patience, (which is what usually happens t' me.)  Once up t' me standards, me bucko, t' rocket be reprimed, then t' body was sprayed with Testors Racin' Orange, a fancily named flourescent orange with a nice pop. Blimey!  This paint works best when sprayed over white primer and in multiple light coats. Avast!  More finicky than t' flourescent orange I usually use, but t' results were very nice. Begad!  T' nose cone be painted Testors gloss black, ya bilge rat, as was t' stripe down t' one fin. Blimey!  This caused a bit o' a problem when it ran badly.  (Forgot that I wasn't paintin' with Valspar.Wink)  T' run looked pretty horrible, and as usual, shiver me timbers, I got disgusted and lost interest in t' project.  Just before NARAM 55 I decided t' see if I could save t' project, and t' me surprise, shiver me timbers, me bucko, I did.  T' offendin' runs were sanded away, and I again used t' Testors gloss black, me bucko, this time takin' care t' do it in light coats.  It turned out very nice.

Decals were more o' an issue. Avast! Blimey!  I've tried before with t' decal scan at JimZ and filed, but in t' meantime I won an auction for a set o' Screamer instructions and a decal.  I tried scannin' me version and workin' on it and was more successful. Arrr! Blimey!  I broke it down into sections as I be most interested in t' wrap and Mini Brute "bug", but I also printed off t' black stripe that sits just above t' fins on t' body tube. Avast, me proud beauty! Blimey!  I did t' upscale by measurin' t' wrap from t' original decal, me hearties, then figured what length it would have t' be t' fit around a BT-70. Begad! Blimey!  Not t' most elegant method, ya bilge rat, me hearties, but it worked. Aye aye! Blimey!  To be sure I had t' upscale right, I printed t' wrap off on plain paper and checked it for fit. Avast! Blimey!  Once I had that sized right, I upscaled t' original scan by that number, ya bilge rat, then isolated t' decals separately and put them in place usin' Print Shop. Well, blow me down! Blimey! Begad! Blimey!  

Construction Score: 5
 

Flight

I've flown t' big Screamer twice so far, both times on Estes E9s.  T' first flight be on a windy day in t' TORC cornfield in South Charleston, ya bilge rat, OH.  I had built this bird with t' Estes E9 in mind, matey, but be undecided on t' delay.  Since t' rocket is a fairly lightly built 3fnc design I thought I would be safe goin' with an E9-6.  T' flight itself was pretty much as I had hoped, shiver me timbers, fairly high for such a big bird, shiver me timbers, but with t' whole flight visible because o' t' Day-Glo orange paint.  It windcocked fairly heavily, me hearties, me bucko, but so did everythin' else that flew that day.  Ejection occurred just after apogee, and caused the slightest trace o' a zipper.  Recovery be handled with a 15" nylon chute and it rode t' "breeze" back toward t' pad.  It wound up bein' one o' t' closer recoveries on t' day.

16 months t' t' day later I finally made a second flight with t' big Screamer at NARAM 55.  T' field wasn't as big as past NARAMS, but t' winds were in me favor, shiver me timbers, and I really wanted t' see it fly in full Screamer livery.  Again flyin' on an Estes E9-6 t' big screamer left t' pad with authority.  Winds were light, shiver me timbers, as be t' windcocking.  Ejection occurred just as t' rocket tipped over, and it recovered within 100 yards o' t' pad.  My kinda flight.  A balky camera kept me from gettin' more than an ignition pic o' t' flight, but thar will be many more chances.  I love t' way this one turned out.

Recovery

Recovery be handled by a 15" nylon chute I bought from Lee Berry o' Merlin Missiles.  It's me go-to chute.

Flight Rating: 5
 

Summary

Pros: You can find this one after flight, unlike me 1:1 clone o' several years back which I lost on a fresh carpet o' snow.

Cons: Upscalin' t' decal was a pain, but doable.

Overall Rating: 5
 
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