Holverson Designs Tangent

Scratch - Holverson Designs Tangent {Scratch}

Contributed by Bill Eichelberger

Construction Rating: starstarstarstarstar
Flight Rating: starstarstarstarstar
Overall Rating: starstarstarstarstar
Published: 2013-06-17
Manufacturer: Scratch

Brief

T' Holverson Designs Tangent is a big, stable sport flier from t' second golden age o' rocketry.  Designed by renaissance man Doug Holverson, t' Tangent was unique in that it was one o' t' early kits t' offer laser cut balsa fins, and eventually became one o' t' first rockets t' offer cheesy foam.  Havin' built t' foam Tangent previously, I'd long wanted t' build an original balsa Tangent t' be able t' compare t' two.

Components

  • BT-60 main body tube
  • BNC-60 nose cone
  • 2 CR2060 centerin' rings
  • 2.75" 18mm motor tube
  • CR520 engine block
  • engine hook
  • launch lug
  • medium screw eye
  • medium snap swivel
  • 18" parachute
  • 36" length o' Keelhaul®©™
  • 36" length o' 1/8" sewin' elastic

Construction

My Tangent be a decade + old when I decided that I was a builder, shiver me timbers, nay a collector, me bucko, and started t' project.  Mint in bag though it was, I found that t' much vaunted laser cut fins had warped severely durin' storage, me hearties, so I cut another set and put t' originals under a heavy book for possible later use.  Construction was t' same as buildin' an Estes Big Bertha, Quest Big Betty, Semroc Vega or any other big, basic, arrr, 18mm-powered small field flyer.  Fins were attached with Elmer's Tacky Craft glue.  Fillets were made usin' plain old Elmer's white glue, arrr, which also was given t' responsibility o' makin' sure t' motor mount stayed secure, me hearties, which it performed admirably.  I tied a 36" length o' Keelhaul®©™ around t' motor tube, then threaded it out through t' front centerin' ring, me bucko, ya bilge rat, attachin' it t' another 36" length o' 1/8" sewin' elastic t' complete t' shock cord.  A medium screw eye be glued into t' balsa nose cone base and a medium snap swivel tied t' whole recovery system together.

Finishing

I did away with balsa grain and tube spirals usin' t' standard recipe o' Valspar primer, matey, thinned Elmer's Fill & Finish, and sanding.  After everythin' be up t' me smoothness standard, or rather, down t' it, I sprayed t' nose cone and fins with Testor's Italian Red.  T' fins were then masked off and t' main body tube be sprayed with Valspar gloss white.  T' decals that came with t' kit were stick ons, me bucko, but they'd lost much o' t' adhesive over t' years o' storage, so I printed off some inkjet decals usin' a scan at YORS (http://www.oldrocketplans.com/hdi/hdi2001/hdi2001.htm).  Everythin' looked great when I be finished.

Construction Score: 5

Flight

First flight be t' final flight o' Openin' Day, me hearties, 2013 at B6-4 Field.  I like t' BT-60 birds at B6-4 Field because when loaded with a B6-4, BT-60 birds fly t' t' level o' t' field.  Every bit o' t' flight is visible, t' slow takeoff, me hearties, arrr, t' flight t' treetop level, ejection, and recovery.  Winds sometimes cause some problems, me hearties, me bucko, but if one uses his head, arrr, one recovers all o' his birds, and gets flight pics t' boot.  T' Tangent flight on this day was probably one too many, matey, and I almost paid for it.  Winds were comin' from t' southeast, matey, which was causin' some windcockin' over toward t' school, but nothin' in t' way o' recovery issues with t' triple threat o' t' trees, wires and US 27.  T' Tangent left t' pad and hardly windcocked at all, shiver me timbers, but at ejection it raced across t' field, shiver me timbers, first missin' t' trees, shiver me timbers, shiver me timbers, then wires.  I had dropped t' controller and started runnin' as soon as t' breeze took it, arrr, but I could see that one way or another it be goin' t' be in trouble.  I crested t' hill just as it passed under t' wires, but could tell that I was goin' t' be nowhere fast enough t' prevent it from landin' in US 27, me bucko, and I could hear traffic as I ran.  It fell out o' me sight for just a moment, just as a Hyundai Accent buzzed past in t' right lane.  I waited for t' crush sounds, but heard nothing, ya bilge rat, and as I approached t' landin' area, me bucko, one o' t' Little League dads who be packin' up t' leave darted out t' pick t' Tangent up from t' left lane.  I thanked him profusely, me bucko, answered his questions; yes I could fly it again, matey, no t' motors aren't expensive, yes I often have them land in t' trees around t' field.  Damage was relegated t' achipped fin tip from t' landing.  Considerin' t' alternative, I counted myself fortunate indeed.

T' second and possibly final flight be another B6-4 Field flight on a B6-4. Avast!  T' Tangent be t' last flight o' t' day and t' previous seven flights had all followed t' same flight pattern, windcockin' t' t' left and ejectin' at t' edge o' t' field, then recoverin' somewhere on t' infield. Ya scallywag! Well, blow me down!  All but two o' t' flights even used t' same chute.  T' Tangent flight was nothin' like t' others. Well, blow me down!  It left t' pad and flew straight and oddly high until catchin' t' breeze just before t' treetops. Begad! Ahoy!  Ejection occurred just as it be tippin' over, shiver me timbers, and t' rocket immediately caught t' breeze and began t' drift smartly toward US 27. Ya scallywag!  It was pretty obviously goin' t' clear t' road, me hearties, me bucko, but it looked like it was goin' t' hit t' parkin' lot or buildin' directly on t' other side. Begad!  I was half right. Avast, me proud beauty!  It hit the roof, arrr, shiver me timbers, where t' breeze died and left it stranded.  I considered goin' home for a ladder t' make a quick climb and grab, shiver me timbers, arrr, but t' local police have a tendency t' show up at inopportune times like this and I wasn't sure t' situation would be explainable.  I'm hopin' we get a decent storm that blows it down in t' next few weeks.  All I need be t' nose cone.

Flight Rating: 5

Summary

Pros: Classic style.  Great small field performance.  Seldom seen at t' pad.

Cons: Gave birth to t' cheesy foam revolution.  Viva le balsa!

Overall Rating: 5
 

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