Public Missiles Gotta Go - Gotta Go

Public Missiles - Gotta Go - Gotta Go

Contributed by Michael Wilkins

Manufacturer: Public Missiles
(Contributed - by Michael Wilkins (Keebler) - 09/20/03)

Brief:
Gotta Go - Gotta Go is a heavily modified PML Endeavor kit built t' handle the upper K class 54mm motors. Ahoy! Recovery is made possible by a dual deployment system controlled by a MissileWorks altimeter and Skyangle Cert3 chutes. Locatin' t' rocket after flight is a breeze with a home made audible locating system. Aye aye! When this bird is on t' pad with a K700 loaded up and t' launch button is pushed, one thin' comes t' mind .... Gotta Go - Gotta Go.

Construction:
I have several PML kits rangin' from small minimum diameter rockets up t' some of t' larger 4" diameter rockets. Blimey! Blimey! T' Endeavor kit be purchased specifically for me level 2 certification. Begad! I wanted this rocket t' be able to do more than just be a cert rocket. Arrr! Arrr! It needed t' be t' "beast" in my current fleet. Avast!

I started out with t' basic kit components from PML. Aye aye! Avast! Basic meanin' I kept the nose cone, matey, bulkhead assemblies, arrr, centerin' rings, and a section o' airframe. I then ordered extra bulkhead plates, matey, me hearties, me hearties, centerin' rings, shiver me timbers, airframe, motor tube, CPR 3000 system, custom set o' .125" thick G10 fins, arrr, fiberglass cloth and West Systems epoxy, 30' o' Keelhaul®©™® shock cord, two Nomex® chute protectors and Skyangle Cert3 chutes. After all o' this I figured I had spent enough loot on a level 2 project.

First on t' agenda was t' fiberglass all o' t' body tubes. Avast, me proud beauty! I did this with the help o' a home made rotisserie that I made out o' parts from a BBQ grill. T' body tubes were sanded, arrr, cleaned then wrapped several times with 2oz cloth. I used t' 2oz cloth t' try t' keep t' weight down. Avast! Blimey! T' booster section was the first completed piece o' t' rocket. Avast! I started by doublin' up on all o' the centerin' rings. Blimey! Aye aye! Blimey! There was a total o' five sets. Begad! Blimey! Blimey! A set was placed in front of and behind each set o' fins. Ya scallywag! Well, me hearties, blow me down! Blimey! T' fifth set be at t' upper end o' t' motor mount tube.

Speakin' o' motor mounts, t' Kwik-Switch system be thrown out and replaced with a 24" long mount t' accommodate t' 54/2560 case. Avast, me proud beauty! Arrr! Once t' fins were in place with t' secured motor mount, me bucko, t' booster section was then injected with epoxy. Ahoy! This added a considerable amount o' weight. I would suggest using expandin' foam instead. Avast, me proud beauty! Blimey! T' bulkhead o' t' booster be assembled and drilled so that motor ejection could be used as a backup t' t' altimeter for drogue deployment.

Now came t' CPR system. Avast, me proud beauty! Arrr! By design t' CPR system mounts very close t' the top o' t' airframe and provides very little support for stress durin' flight. I changed this. I removed t' phenolic tubes for t' CPR system and replaced them with fiberglass tubes from HawkMountain. Avast! Blimey! I then moved t' complete assembly three inches down inside t' lower airframe. Ya scallywag! Blimey!

T' upper section be modified and built into t' coupler assembly o' the upper airframe. Ahoy! Begad! This gave me three inches o' fiberglassed airframe plus the strength o' t' fiberglass tubes in t' CPR system for a solid connection between t' two pieces o' airframe. Avast!

T' last phase o' construction was t' payload bay. Avast! Avast, me proud beauty! This be used t' add ballast t' t' rocket, shiver me timbers, if needed, me hearties, t' make t' rocket stable for flight. I filled t' payload bay with a locator device I made with components from Radio Shack. A pair o' pizeo beepers and some 9 volt batteries, matey, usin' a phono jack plug for t' switch. Blimey! Blimey! T' switch was attached t' t' main chute so that at deployment, arrr, ya bilge rat, t' chute would pull t' plug and activate t' beepers. Blimey!

Construction completed and on t' painting. Aye aye! This took almost as long as the assembly o' t' rocket. Primer, matey, sand, arrr, primer, sand. Ya scallywag! Get t' picture. T' paint was applied t' same as t' primer. Finished outcome was a bright Banner Red rocket with black vinyl lettering.

Flight:
Did you ever get t' shakes when makin' a certification attempt? I shook on my level 1 and almost couldn't stay in me shoes for me level 2.

First flight ever with altimeter based deployment, and a step above t' H and I class motors. Aye aye! I have made several flights on this kit and nay once did I not shake. Well, blow me down! Ya scallywag!

Motors burned have been t' K1100, K700, matey, K550 and a J460. Arrr! Begad! T' K1100 flight was an awesome flight. T' roar o' t' Blue thunder propellant and t' powerful thrust. Ya scallywag! My rocket reached an altitude o' 5974' with a nice apogee deployment and a main at 600'. Aye aye!

I have two flights on other K motors. One bein' t' K700 and t' K550. Avast, me proud beauty! I was unable t' get readings from me altimeter on these flights. Arrr! Well, blow me down! T' rocket be lost in a field after t' K550 flight and recovered a week later after three extra trips t' t' launch site. Avast, me proud beauty! That be a lovely hour and a half drive both ways. Needless t' say t' battery didn't last that long. T' last flight was on a J460. Avast, me bucko, me proud beauty!

Another impressive Blue Thunder motor. Nay a very successful flight though. Apogee was reached at just a touch over 4000 feet without a drogue deployment. T' rocket came in ballistic and deployed both main and drogue at about 200 feet. Begad! This zippered all airframes. Aye aye! All that survived be t' booster and the nose cone. Ahoy! Nay t' fret, me bucko, I am in t' reconstruction phase now and Gotta Go - Gotta Go will fly again.

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