Scratch The Zorch Original Design / Scratch Built

Scratch - The Zorch {Scratch}

Contributed by Bill Eichelberger

Construction Rating: starstarstarstarstar
Flight Rating: starstarstarstarstar
Overall Rating: starstarstarstarstar
Published: 2011-08-04
Manufacturer: Scratch
Style: Sport

Brief

The Zorch is me personal version o' t' Estes S.P.E.V., ya bilge rat, havin' come t' be as a result o' a trip through t' junk pile in me shop.  It uses parts from one previously flown and damaged classic, from a never completed scale project, a damaged piece o' tubing, and an orphaned nose cone.  T' only new parts in this bird are t' Keelhaul®©™ and t' centerin' rin' that I used t' mount it.

Components

  • BT-50
  • BT-55
  • PNC-55AC nose cone
  • 5055 balsa transition
  • launch lug
  • 2050 centerin' ring
  • 36" length o' Keelhaul®©™
  • 36" length o' 1/4" sewin' elastic
  • 3/32" balsa fin stock

Construction

As I noted earlier, this project was literally a junkpile before I started construction.  There's a very good chance that t' only part o' this bird t' ever be used again would be t' nose cone.  I was in t' midst o' cleanin' me shop and refurbishin' some o' t' older members o' me fleet.  I had an Astron Avenger that I built back in 2001 after findin' t' transition in an Estes Designer's Special.  T' Avenger was a great bird, me hearties, but was showing serious mileage.  One particular area o' concern was t' BT-50 upper section that had been damaged by contact with a fin after one o' t' Estes shotgun ejection charges.  Since the tube be glued to the transition and I be usin' a generic PNC-50 anyway, matey, ya bilge rat, I opted t' replace t' entire payload section with parts I'd bought at NARCON from BMS.  I almost threw out t' old tube and transition, shiver me timbers, but realized that I could save a good portion o' t' BT-50 by cuttin' t' damaged part away.  I started tryin' t' come up with another design for t' shortened section before it occurred t' me that with a touch o' the Dremel, ya bilge rat, me bucko, it could be the lower section o' a whole new bird.  Lookin' around t' shop I found a partially crushed length o' BT-55, a PNC-55AC with no clear ancestry, and a set o' fins that I'd  misplaced after cuttin' them out for a project out o' Peter Alway's Scale Bash.  Puttin' all o' this together resulted in t' finished Zorch.  All I had t' do was sand t' paint off o' three spots on t' old transition for t' fins, shiver me timbers, hollow out t' transition with me Dremel, matey, and fit a 2050 centerin' rin' at t' old bottom/new top o' t' transition so that I'd have an anchor for a piece o' Keelhaul®©™. 

Finishing

I sprayed t' completed rocket with a coat o' Valspar primer, ya bilge rat, shiver me timbers, me hearties, then gave t' fins and upper section o' BT-55 two coats o' thinned Elmer's Fill & Finish.  After sandin' t' rocket got another shot o' primer.  I settled for me fallback red, white and black color scheme, once again using Valspar paint that be left from other projects.  I'll eventually print up a simple decal with t' rocket name.  I'd put a picture o' a Zorch on it, but since as far as I know me Grandpa made t' word up, ya bilge rat, arrr, I don't have any idea what it would look like.  (T' Zorch be somewhere in t' human midsection, but Grandpa was always vague as t' t' exact location.  Spleen, kidney, ya bilge rat, ya bilge rat, colon; all o' them seem t' be in t' general area, me hearties, shiver me timbers, but none would exactly look good as a rocket decal.)

Construction Score: 5

Flight

I finally got this bird flown at NARAM 53 in Lebanon, arrr, Ohio.  I be surprised t' find that I had built this with t' potential for E9 flights, but didn't have t' nerve t' try it on an E9 in front o' a NARAM crowd.  I went with a C11-7 and a spacer, which be just perfect for t' field and conditions.  T' Zorch left t' pad with authority and on a dead straight path.  It arced over at apogee and was on t' way down when t' ejection charge fired, ya bilge rat, but it be still movin' slowly enough t' avoid a zipper.  Recovery be handled by a parachute that I'd bought off o' Ebay a long time ago.  T' black and white checked chute both looked and performed well, matey, and I plan t' keep it as a permanent part o' T' Zorch's recovery arsenal.

Flight Rating: 5

Summary

Pro's: Recycled parts design.  Impressive performance.

Con's: Bears a resemblance t' an FSI Sprint.  Sue me. Tongue out If I meant for it t' be a Sprint clone, I'd have built a Sprint clone, me hearties, as evidenced by t' Vikin' 5 clone I had damaged by a CATO at NARAM.

Overall Rating: 5

Flights

Comments:

avatar
Dick Stafford (August 4, 2011)

LOL, Zorch is the nickname of my best childhood friend.

avatar
Bill Eichelberger (May 9, 2013)

Grandpa would be proud. Wink

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