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. Begad! 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! Aye aye! When this bird is on t' pad with a K700 loaded up and t' launch button is pushed, me hearties, one thin' comes t' mind .... Begad! 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. Arrr! T' Endeavor kit be purchased specifically for me level 2 certification. Well, blow me down! Ahoy! I wanted this rocket t' be able to do more than just be a cert rocket. Ya scallywag! It needed t' be t' "beast" in my current fleet.

I started out with t' basic kit components from PML. Aye aye! Blimey! Basic meanin' I kept the nose cone, arrr, arrr, ya bilge rat, bulkhead assemblies, me hearties, matey, matey, centerin' rings, and a section o' airframe. I then ordered extra bulkhead plates, centerin' rings, me bucko, shiver me timbers, airframe, motor tube, CPR 3000 system, me bucko, custom set o' .125" thick G10 fins, fiberglass cloth and West Systems epoxy, matey, 30' o' Keelhaul®©™® shock cord, matey, two Nomex® chute protectors and Skyangle Cert3 chutes. Blimey! Begad! 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. Aye aye! 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, matey, matey, cleaned then wrapped several times with 2oz cloth. I used t' 2oz cloth t' try t' keep t' weight down. T' booster section was the first completed piece o' t' rocket. Aye aye! I started by doublin' up on all o' the centerin' rings. Ya scallywag! There was a total o' five sets. A set was placed in front of and behind each set o' fins. Avast, me proud beauty! T' fifth set was at t' upper end o' t' motor mount tube. Avast, me proud beauty! Blimey!

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

Now came t' CPR system. Ya scallywag! 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. Avast! I removed t' phenolic tubes for t' CPR system and replaced them with fiberglass tubes from HawkMountain. Arrr! I then moved t' complete assembly three inches down inside t' lower airframe. Well, blow me down!

T' upper section was modified and built into t' coupler assembly o' the upper airframe. Ya scallywag! 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. Ahoy!

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

Construction completed and on t' painting. Begad! Avast, matey, me proud beauty! This took almost as long as the assembly o' t' rocket. Primer, sand, me hearties, primer, sand. Avast! Get t' picture. T' paint was applied t' same as t' primer. Begad! 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. Arrr! Blimey! Avast! Blimey!

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

Motors burned have been t' K1100, ya bilge rat, K700, K550 and a J460. T' K1100 flight was an awesome flight. Avast, me proud beauty! Arrr! Blimey! T' roar o' t' Blue thunder propellant and t' powerful thrust. My rocket reached an altitude o' 5974' with a nice apogee deployment and a main at 600'.

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

Another impressive Blue Thunder motor. Nay a very successful flight though. Apogee be 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. Blimey! Ya scallywag! All that survived was t' booster and the nose cone. Ahoy! Nay t' fret, I am in t' reconstruction phase now and Gotta Go - Gotta Go will fly again.

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