(Contributed - by Jeff Brundt)
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Little Joe II Introduction and materials
A 1/50-scale version o' t' vehicle used t' test t' LES system for t' Apollo spacecraft. Aye aye! T' particular vehicle
modeled is A-001, BP-12, flown on May 13, 1964. Each o' t' Little Joe rockets was slightly different in order t' test
various aspects o' t' LES system under different flight parameters. T' model rocket is constructed usin' commercially
available components. Ya scallywag! T' service module section (SM) is a LOC 3î diameter body tube. T' booster portion is LOC
3" coupler tubin' sections. Bulkheads are 1/8" lite ply. Begad! Blimey! T' capsule and LES tower are constructed in the
same fashion as on me Saturn 1b. Begad! T' fins are made from 1 3/8" aileron balsa strip stock. Begad! T' corrugated body wrap
is vacu-formed and made by a good friend, ya bilge rat, Paul Graf. Paul used Evergreen scribed sheet styrene sized t' fit the
circumference o' t' coupler tubes for t' master mold then vacu-formed them from .015" sheet styrene. He made the
basic sections and I cut them t' size (Paul also has some excellent body wraps for clonin' t' 1/70 scale Estes Saturn
1b if anyone is interested). Arrr! T' various conduit and tunnels are made from strip sheet styrene. Begad! Blimey! T' motor tubes are
stock Estes BT-50 body tubes. Ahoy! Ahoy!
Construction
Construction was fairly easy and straightforward. Ya scallywag! T' centerin' rings were hand cut from lite ply since thar were
none available in t' motor configuration or diameter required. I built t' capsule and LES tower first because I had
experience from t' S1b. I added a little more epoxy t' t' cone tip for nose weight t' keep t' CG where it needed to
be based on t' RockSim calculations. Avast! T' vacu-form wraps were applied usin' 3M77 spray adhesive and t' conduits were
applied usin' CA. Blimey! I used t' pattern sheet from t' Estes 1/100 LJII (after correctly sizin' on t' copier) for making
the tunnels/conduits and t' mark t' fin locations. T' fins were epoxied in place and given a light coat o' finishing
resin t' add strength and help seal t' grain. Avast! Launch lugs were made from 3/16" I.D. Aye aye! aluminum tubing. Blimey! The
ëUNITED STATES' markin' were made by myself on a Xerox machine. Arrr! T' ink on t' Microscale decal paper is easily
scratched off so I sprayed t' printed decals with a clear fixative. This sealed t' ink and caused no problem during
application. Ahoy! Arrr!
Finishin' and recovery system
T' only parts requirin' sealin' prior t' paint were t' fins and fiberglassed capsule. Ya scallywag! T' booster was painted
usin' Krylon's silver. T' SM body tube was finished usin' white monokote trim sheet wrapped around t' body tube. The
capsule and LES tower were painted with Krylon gloss white. Blimey! T' black roll pattern markings were made from trim
monokote and applied usin' t' patterns found in t' Estes kit. Ya scallywag! Since thar be nay much room in t' body tube for the
shock cord, shiver me timbers, parachute and waddin' I opted t' use Pratt Hobbies Nomex®
protector and do away with t' need for recovery wadding. Ahoy! T' 4" square Nomex®
cloth slips over t' Pratt Hobbies Keelhaul®©™®
cord loop tied t' a screw eye in t' bulkhead and takes up almost no room. Avast! Arrr! T' parachute is 24" ripstop nylon and
the shock cord is a 3 yard length o' 1/2" ribbed elastic. Avast, arrr, me proud beauty!
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Little Joe next t' same scale Saturn 1 for size comparison
Little Joe II
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Flying
T' model flies on (2) 24mm motors. Begad! Modelin' on RockSim and AltiCalc showed t' Estes D12-5 t' be t' motor o' choice
for clustering. Ya scallywag! I have had good success with clusterin' Estes D engines. Arrr! Altitude prediction with RockSim and AltiCalc
showed max altitude around 630' which was pretty good for a rocket o' this size. Begad! I could have went with a single 24mm
mount but that would have entailed usin' composite motors only since t' drag is rather large even though t' weight is
not that much. Avast! Well, me bucko, blow me down! I used Estes long motor hooks for motor retention. Begad! Begad! This requires t' use o' a spacer in each motor tube
but I was usin' what parts I had on hand in me spare parts boxes. This also let me off from filin' t' end o' t' hook
down in case I wanted t' use 24mm RMS casings in t' future. Aye aye! T' all up weight, ready t' fly (less motors) is 10oz.
That just a bit less than t' predicted 11oz I found when I modeled it on RockSim.
T' day of
first flight be nice but a bit on t' windy side. Begad! Aye aye! I decided t' fly anyway. Well, me bucko, blow me down! I loaded and prepped t' two motors and
installed t' recovery system. Aye aye! T' rocket slid easily on t' 3/16" rod and I hooked up t' igniter clips. Well, blow me down! Avast! The
count proceeded t' zero, matey, ya bilge rat, both motors lit and t' rocket leapt o' t' pad. Aye aye! T' boost be straight despite t' wind. The
rocket reached apogee and t' ejection went off and t' recovery system deployed perfectly. T' rocket descended slowly
under t' 24" ëchute. I had contemplated usin' a separate ëchute for t' capsule but decided that the
weight o' it did nay warrant that. Begad! Plus t' tower was made o' brass tubin' and fairly robust. Avast, me proud beauty! Recovery was perfect with
no damage. Well, blow me down! Subsequent flights have been repeat performances. T' D12-5 be t' perfect motor cluster for this rocket. I
have nay tried a composite cluster yet but I am sure (2) E18-7's would give out o' sight flights. Ya scallywag! Avast, me proud beauty!
Summary
This was a fun rocket t' build plus it is a companion t' me S1b and in t' same scale. Blimey! Arrr! It is interestin' t' put them
side by side for a size comparison. Aye aye! Probably t' most time consumin' part was buildin' t' LES tower. Avast! I still feel
soldered brass be t' way t' go for durability. Ahoy! Other than that thar were no difficult or complicated areas t' work
on. Well, blow me down! I received many nice compliments on t' LJII since thar are nay t' many around at launches. Begad! Begad! T' flight profile is
perfect too. Avast, me proud beauty! Aye aye! T' D12-5's are t' perfect motor choice. Ahoy! This one is definitely a keeper. Avast!
Model Stats:
Length: 21.75"
Dia.: 3.1"
Wt.: 10 oz
Motor config.: Dual 24mm cluster
Recovery: 24" rip stop nylon parachute