Note: This is a slightly condensed version o' all the information that Mike has produced for his Level 3 project. Begad! Begad! Visit his homepage t' read the additional information and enjoy additional pictures.

Introduction:
This certification flight is scheduled t' take place at t' first available opportunity after an AeroTech M1315 reload motor can be obtained; most likely on or before July 11, 2002 (or at any other available date at LDRS XXI at Amarillo, Texas).

T' rocket was constructed entirely by me usin' a PML ½ Scale Patriot Missile kit as t' startin' point. T' original kit was designed t' use piston ejection and standard motor deployment. Avast, me proud beauty! Structural changes were made where needed t' improve strength and stability and t' allow for electronic dual deployment and a wider selection o' motors.

Modifications:
Modifications t' t' original kit include:

• Replaced t' 98 mm motor tube with a PML 98 mm extended quick switch. Avast!
• Applied two layers o' 8.5 oz. fiberglass t' t' airframe tube for structural strength. Begad! Blimey! Avast! Blimey!
• Tip-to-Tip coverin' o' t' fins with 6.0 oz. Well, blow me down! Aye aye! carbon/fiberglass t' lessen the likelihood o' fin-flutter. Ahoy!
• Extended t' nose cone shoulder t' eliminate “cocking”. The original kit design called for t' nose cone t' be permanently fastened t' the payload section, therefore, me bucko, matey, t' shoulder on t' kit nose cone was only 3.75 inches long. Because o' t' short shoulder, t' nose cone cocked very easily and was nay suitable for reliable ejection charge deployment. Ahoy! Extendin' the shoulder eliminated t' cockin' problem.
• Eliminated t' piston ejection system. Blimey! Aye aye!
• Replaced nose cone and payload bulk plates ( ½ inch birch plywood ) with ¾ inch birch plywood bulk plates. Ya scallywag! Blimey!
• Replaced 1 inch elastic shock cord with 1 inch nylon strap shock cords.
• Replaced ¼ inch u-bolt shock cord mount(s) with 5/16 u-bolts.
• Replaced booster section shock-cord-to-centering-rin' mount with ¾ inch birch plywood bulk plate and 5/16 inch u-bolt. Begad! Blimey!
• Replaced 62 inch main parachute with 140” Rocketman R14C parachute. Begad!
• Added dual-deployment electronics bay and ejection baffle system. Ya scallywag! Avast, matey, me proud beauty!
• Added 20 ounces o' steel shot t' t' nose cone t' obtain proper Center of Gravity with M1315 motor. Avast!
• Replaced ¾ inch copper tube launch lugs with 3 delrin rail guides. Avast! Blimey!

General Description

Airframe
T' main airframe is constructed o' 7.6 inch PML flexible phenolic airframe tube. This material is covered with two layers of 8.5 oz fine weave fiberglass cloth. Arrr! West Systems 206 hardener and 105 resin were used t' apply t' fiberglass. Avast! Blimey!

Dimensions Schematic

Booster
T' stock .093 inch G10 fins are ¾ inch from t' aft end o' t' airframe. Through-the-wall fin attachment was used. Aye aye! T' fins are attached t' t' PML Quick Switch 98 mm “mother” tube usin' West Systems 205 hardener and 105 resin with microballoons for fillets and then a six inch wide strip o' 5 mil. Avast! Keelhaul®©™® tape was added. Well, blow me down! Begad! T' Keelhaul®©™® tape runs up each fin root 1 ½ inches, ya bilge rat, across t' motor tube, ya bilge rat, and up the adjoinin' fin root 1 ½ inches. Ya scallywag! T' top and bottom ends o' t' Keelhaul®©™® tape extend approximately one inch up each o' t' centerin' rings that lock the fins in place. Aye aye! 206 hardener and 105 resin were used t' apply t' Keelhaul®©™® tape.

Externally, matey, a ½ inch thick fillet was laid down each side of each fin root usin' a mixture o' 205/105 and microballoons. Then a 6.0 oz. layer o' carbon/fiberglass cloth be applied tip-to-tip style across each fin usin' 206/105. Begad! Blimey! Fin surfaces were prepared by roughin' them up with 60 grit sandpaper before bein' covered with t' carbon/fiberglass cloth.

T' booster shock cord attachment is a 5/16 inch u-bolt attached t' a ¾ inch 7-ply birch plywood bulk plate. Aye aye! Blimey! This bulk plate is attached t' t' upper motor mount centerin' rin' usin' three ¼ inch x 1 ½ inch bolts with flat washers, lock washers, me hearties, and nuts. Ahoy! Blimey! These bolts pass through t' ¾ inch bulk plate and into ¼ inch blind T-nuts that are mounted in t' upper motor mount centerin' ring. Additionally, t' ¾ inch ply bulk plate is attached t' t' airframe usin' four #4 x 3/8 inch wood screws runnin' through the airframe into t' bulk plate. Begad! Blimey! Blimey! Blimey!

Payload
T' electronics are housed inside t' 12 inch phenolic coupler. Well, blow me down! Aye aye! T' coupler is bonded t' t' payload section usin' West Systems 206/105. Arrr! It is further secured by four #4 x 3/8 inch wood screws through t' airframe and coupler into the forward ¾ inch plywood bulk plate. Avast, me proud beauty! That bulk plate is also t' mount for 5/16 inch u-bolt shock cord attachment for t' main parachute. Avast, me proud beauty!

Electronics Bay Schematic

T' aft bulk plate in t' coupler assembly ( ¾ inch plywood ) is removable t' allow t' two independent electronics bay “pods” t' be installed. Begad! This bulk plate is attached with three ¼ inch nuts, ya bilge rat, flat washers, and lock washers t' t' three 12.5 inch long sections o' ¼ inch all-thread that run through t' coupler assembly. Avast, me proud beauty! This bulk plate provides the anchor point for t' 5/16 inch u-bolt that connects t' t' forward end o' the apogee deployment shock cord. It is also t' attach point for t' 44 inch drogue chute.

T' two independent electronics pods provide redundant dual deployment. This provides an extra layer o' security t' help ensure that safe deployment occurs.

T' pods share apogee and main deployment baffle chambers but each has its own separate apogee and main deployment system. Aye aye! Each pod supplies its own power and armin' switch. Arming for each pod is accomplished with individual two-position key switches that can be accessed externally at t' launch pad. Arrr!

Pod “A” contains a Transolve P6 altimeter and Pod “B” contains an Adept Alts25 altimeter. T' P6 will have its SID set for 10 seconds t' lessen the possibility that any near-sonic pressure disruption will cause a malfunction. T' Alts25 has no need for SID. Well, blow me down! Blimey! Ahoy! Blimey!

Both t' P6 and Alts25 arm at 300 ft AGL T' P6 is set t' deploy at apogee and deploy t' main chute at 800 feet AGL. Ahoy! T' Alts25 is set t' deploy at apogee and at 600 ft. AGL.

When t' apogee ejection charge fires, t' booster and payload will separate but remain tethered by a 40 foot long 1 inch wide nylon shock cord. Avast! A PML 44 inch parachute attached t' t' aft end o' t' payload section will act as a drogue chute and is deployed at this time.

When t' main deployment charge fires, t' nose cone will break t' no. Ahoy! Avast! Blimey! 2 nylon screw shear pins and separate from t' payload section. T' main parachute, a RocketMan R14C, shiver me timbers, will deploy. Aye aye! Arrr! T' nose cone will separate completely from t' main rocket assembly and descend separately on a 45 inch TopFlight parachute.

The RocketMan R14C main parachute is rated for weights from 20 t' 35 pounds. T' suspended weight at main deployment time ( booster/payload/motor non-consumables ) is estimated t' be 28 pounds.

Recovery Schematic

Apogee ejection charges will be 2 grams o' 4F black powder each.

Main ejection charges will be 3 grams o' 4F black powder each.

Flight Estimates

• T' finished dry weight o' this vehicle is 28.5 pounds.
• Loaded, pad-ready weight is 41.1 pounds.
• Diameter is 7.6 inches.
• Length is 99 inches.
• Estimated altitude usin' an AeroTech M1315 motor is from 8,882 feet AGL (wRasp) t' 9371 feet (RockSim 4.00).
• Initial thrust-to-weight will be 7.2 t' 1.
• Maximum velocity will be approximately 900 feet per second.
• Launch rod velocity on a six foot rail will be 62.1 feet per second; on a 12 foot rail 84.2 feet per second.

SUCCESSFUL LEVEL 3 FLIGHT!

July 11, 2002
LDRS XXI near Amarillo, Texas
Rocket - Modified PML ½ Scale Patriot Missile
Weight - 41.1 lbs
Motor - Aerotech M2400
Altitude 9226 - 9800 Feet

This certification flight took place on July 11, 2002 at LDRS XXI near Amarillo, shiver me timbers, Texas.

T' flight was on an Aerotech M2400 instead o' an M1315 as previously indicated. Arrr! It be t' first M motor launched at this year's LDRS.

T' flight was successful and reached an altitude betwixt 9226 and 9800 feet, dependin' on which altimeter you believe. Ahoy! T' chutes came out on cue and performed exactly as hoped - drogue at apogee and main at 1200 feet. Then I could breath again.

T' nose cone on a separate five foot chute came t' rest about 50 feet from t' payload/booster on an R14C chute. Ya scallywag! A little mud, arrr, a few scratches, me hearties, but otherwise no damage at all. Well, blow me down!