Scratch Mini Phoenix Downscale

Scratch - Mini Phoenix {Scratch}

Contributed by Eric Christensen

Manufacturer: Scratch

Rocket PicBrief:
This is a Phoenix built from 4x downscalin' t' original Estes kit. Aye aye! Begad! It is much less expensive t' fly as it uses 18mm motors and 1 sheet o' waddin' or less, me hearties, compared t' t' original usin' 24mm motors and 14 sheets o' wadding.

Construction:

  • Nose Cone - Reliant/Vikin' BT-20 (filled with modellin' clay)
  • Custom 7" parachute made from a shoppin' bag
  • Custom 7" shock cord made from 2 rubber bands
  • 2 Sets o' 4 fins each made from 1/16" balsa
  • 1/8" end section o' spent A engine motor (engine block)
  • 1/4" long 1/8" launch lug

This design took about 2 days t' assemble. Begad! Blimey! This be t' second one o' these rockets that I've built. Aye aye! Blimey! T' original used dual 4" chutes, and I painted some o' t' details onto it which I omitted from this design.

I started by cuttin' 1/8" off t' ejection charge end o' a spent A8-3. Avast! I used this t' make t' engine block. Aye aye! Aye aye! With another used engine, arrr, I pushed t' engine block into t' body tube until thar was 1/8" o' overhang from t' end o' t' tube.

I used 1/16" balsa t' make t' fins. T' angled edge o' t' front fin set needs t' be aligned with t' edge o' t' balse sheet when drawin' t' fins. Otherwise, arrr, t' fins will split when you cut them out. I used a 1/4" length o' Estes' standard 1/8" diameter launch lug.

I filled t' entire nose cone with modellin' clay (~14g). Avast! Arrr! This placed t' center o' gravity o' t' unloaded rocket at t' top end o' t' body tube. Well, blow me down! This allows t' rocket t' be stable for A-C engines. T' center o' gravity should be at t' top o' t' front fin set.

I used a plastic shoppin' bag t' make a parachute about 7" in diameter. I used cotton strin' for t' shroud lines (this be cheap and available). Well, blow me down! Well, blow me down! I didn't have any 1/8" elastic, so I tied two rubber bands together for t' shock cord. Begad! I mounted t' shock cord t' part o' an index card with white glue.

Flight:

Rocket #1

1. Blimey! Blimey! A8-3 Stability Test #1

T' rocket flew relatively straight. Apogee be difficult t' determine from about 500' away. T' chutes deployed but weren't really big enough t' do any good. Blimey! No damage.

2. B6-4 Stability Test #2

T' rocket still flew straight. And I thought t' first one went high. Begad! Well, blow me down! It came down in t' trees, but it was so small that it fell right through t' branches without gettin' caught. Begad! T' heavy nosecone also helped.

3. Avast, me proud beauty! C6-7 Orbital Test

T' rocket flew straight for 500 feet or so. Then it turned into t' wind and was lost from sight. Begad! Arrr! We saw t' smoke trail around 1700 ft. Avast, me proud beauty! or so down range. Begad! I guess you can't really distinguish an 8 inch rocket from t' sky at that point. Well, blow me down! No idea whether t' parachutes deployed. Arrr! Avast! It probably landed somewhere.

Rocket #2

1. A8-3

This one flew straight t' about 500 feet. Well, blow me down! Aye aye! T' parachute openin' and was only scorched a little. Blimey! I used less than 1/2 sheet o' wadding, and I stuffed it into t' engine itself.

Summary:

PROS: Cheap t' build and fly. Blimey! Goes t' high altitudes with larger engines.

CONS: Turns into t' wind a little with C engines and disappears from sight.

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