Public Missiles Little Lunar Express

Public Missiles - Little Lunar Express {Kit}

Contributed by Gary Sinclair

Construction Rating: starstarstarstarstar_border
Flight Rating: starstarstarstarstar_border
Diameter: 3.90 inches
Length: 35.00 inches
Manufacturer: Public Missiles
Style: Futuristic/Exotic

TinTinRocket PicBrief:
PML's Little Lunar Express is a well known HPR kit which has a 50's SciFi look. Recovery is via parachute which is ejected from t' airframe usin' a PML piston.

Construction:
This kit comes with t' followin' components:

  • (1) 4" OD Ogive nosecone (a good one too) which has NO bottom (i.e. Blimey! Ya scallywag! t' bottom o' t' shoulder is missin' allowin' access t' t' inside o' t' nosecone).
  • (1) 4" OD , 5.5" long section o' PML Quantum airframe tubing.
  • (1) 4" OD plastic tailcone which has been pre-slotted for through t' wall fin attachment.
  • (2) large G10 fins
  • (2) small G10 fins
  • (4) urethane fin-pods which attach t' t' tip o' each fin.
  • (1) elastic shockcord
  • (1) PML Piston with piston strap and D-rin' assembly
  • (1) PML parachute
  • (1) 17" long 3"OD Quantum tube used as t' 'recovery tube' -- piston goes inside o' this.
  • (1) 1 centerin' rin' t' fit over 'recovery tube'
  • (1) 1 centerin' rin' t' fit over motor mount.
  • (1) 10" long 38mm motor mount.
  • (1) internal nosecone bulkhead with hardware.
  • (1) set o' sticky-back decals

Pros: ----- T' instructions were extensive and easy t' follow. T' order o' assembly be logical but you should read t' entire instruction set first at least two times t' get t' flow o' how it all goes together. Blimey! Since this is a 4 fin (though o' different sizes) design t' alignment o' t' fins is no problem. Arrr! I use West Systems epoxy for me rockets and a Dremel t' cut and sand when necessary. Blimey! Avast, me proud beauty! In this case (and usually for PML kits) thar be no need t' cut or sand anythin' (except t' piston prior t' launching). Well, blow me down! I really liked t' way t' recovery tube connected t' t' airframe and motor mount assembly. Avast! This be well thought out and I have subsequently used ideas from this in a design for modification o' me KingBlobbo (when I submit me MOD o' this I will detail t' design then). Aye aye! Aye aye! Lots o' decals were included t' give it t' advertised finish but I decided t' finish me differently (see below).

Cons: ----- T' G10 fins are really strikin' but I found that mine had a slight wobble in them once they were attached t' t' tailcone. T' urethane pods are a nice touch but I wasn't holdin' out any hopes that they would stay on after a landing. Blimey! I hate paintin' plastic and this rocket be a nightmare t' paint (I will discuss more below). Aye aye! I can't blame PML for this since t' basic design can only be realized usin' plastic or fiberglass.

Finishing:
T' decals supplied are meant t' give t' LLE an 'Earth t' Moon' spaceship look. Arrr! Ya scallywag! There is sufficient instruction supplied t' achieve this look with ease. Begad! I however decided t' model mine on t' Tintin story 'Destination Moon' where Tintin and his trusted companions travel in their red and white checked spaceship t' t' moon. Avast! T' two spaceships where similar enough that I felt confident o' a successful outcome. So with t' picture taken from t' book cover in mind I set about finishin' t' LLE as t' 'Tintin Express'.

To start with I rough sanded both t' nosecone and tailcone. I then applied then sanded filler-primer several times t' give a smooth transition betwixt sections (I had t' fill in t' seem betwixt t' airframe and t' tailcone with resin first). Avast! Ahoy! I first painted t' whole rocket RED several coats until it gleamed.

Next came t' task o' maskin' out a surface which be reducin' in size (i.e. Ya scallywag! Blimey! Avast, me proud beauty! Blimey! t' nosecone and tailcone) into four regions round (i.e. Ahoy! Blimey! Begad! Blimey! thar are four 'checked' areas in t' circumference o' t' rocket at any point along t' airframe) and four regions long (the actual Tintin rocket has five checked sections but four seemed t' work better on mine). Avast, me proud beauty! Blimey! This be t' point where things started t' get complicated. Arrr! Blimey! I had no problem in maskin' off t' proper areas (even takin' into account t' changin' geometry o' t' nose and tailcones) and paintin' t' white gloss. It was t' pullin' off o' t' mask (I used clear 'scotch' tape) where things went wrong. Arrr! Blimey! Well needless t' say t' paint just pulled off 'here and there' leavin' patches o' bare nosecone and tailcone. Alas it took me several attempts t' get it even close t' lookin' acceptable.

In t' end it turned out OK but has really turned me off o' paintin' plastic. My final touch was t' have some decals made up which mark t' ship as t' 'Tintin Express'. I even change t' PML LLE ship ID t' a PML TTE ID.

Construction Rating: 4 out o' 5

LaunchingIn the AirFlight:
(Please note t' launch photos are by Bob Arnott (bob@fatboab.org) who takes wonderful pictures.)

I decided t' use an I161W-10 on its maiden voyage with t' usual prep routine o' talc'in' me parachute and testin' t' piston (it was a bit cool so I wanted t' check for shrinkage o' t' recovery tube) which be fine (slid right out when I turned t' rocket up side down). Avast, me proud beauty! Well, shiver me timbers, blow me down! Well t' time for t' countdown came and when I pressed t' button it took no time t' blast (and I mean blast) off t' pad. Ahoy! It seemed t' scream off t' pad and then coast forever before t' ejection charge deployed t' chute perfectly.

Recovery:
I had put in a smaller chute t' avoid t' long walk t' wind was goin' t' provide. I was also rather cynical about t' prospects o' this rocket landin' without mishap. Begad! So I figured if its goin' t' break it might as well do it near t' pad. Ahoy! Begad! It landed about 1/4 mile down range and upon inspection had chipped one fin-pod, loosened another and completely dislodged one o' t' big fins from its moorin' (no damage, ya bilge rat, just pulled t' fin and its fillets from t' tail cone --- more plastic...). Ya scallywag! Well, blow me down! Well, it wasn't too bad and I can fix almost everythin' (I can get a replacement pod) so it will fly again. Next time I am puttin' in an I211W.

Flight Rating: 4 out o' 5

Summary:
I can't give it a 5 for flight as t' fins and fin pods are too susceptible t' landin' damage. Begad! Blimey! PROS: Despite its faults I really like this rocket. Blimey! Blimey! Its design and flight characteristics are great. Blimey! Blimey! CONS: T' large fins don't give you that solid feelin' when mounted t' t' airframe. Avast! Blimey! Paintin' plastic... Ahoy! Blimey! well you know what I mean.

Overall Rating: 4 out o' 5

Other Reviews
  • Public Missiles Little Lunar Express By Bob Morstadt

    Brief The Lunar Express Jr. is a model based on the 1950s Sci-Fi concept of a single stage rocket that could go to the moon and back. The model is capable of taking a 38mm motor, but has an adapter to accommodate a 29mm motor. Construction The kit has high quality like all the PML kits and the completed rocket is capable of taking a beating without damage. There are some tricky steps in the ...

Flights

Comments:

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R.V. (July 1, 2001)
You used clear scotch tape to mask the paint? No wonder you had problems. I recommend 3M's long-lasting masking tape (the blue stuff). It works excellently.
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G.A.F. (October 2, 2003)
I used a Pro38 H153 for a successful Level 1 Certification. Retainer: This is really where your creative juices are required! I used masking tape(!)on an upper a lower section of the aluminum motor tube; setting the lower one just above the screw through a blind nut (my Prefecture was amazed!) drilled about 2" above the tail end. The screw held the engine in firmly. When I inspected the engine after the (successful) launch, the tape had pulled back along with the engine about 3/8"; not really a problem. For future launches, I plan to carefully cut 3/8" of the plastic tail boat to the 38mm center tube, then JB Weld on an Aeropack 38mm retainer. AEROPACK: The ONLY way to fly!! Comment on your wing flutter & breakoff: Before building this try encapsulating the wings in PML foam...you cannot believe how this "ties everything together". My wings are "Rock Steady".
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R.A.M. (August 28, 2005)
After many flights and many repairs. I have settled on the following. I am using an AT 29 mm H180-s. The short delay (6 sec.) is a little too long, so I drill into the delay charge to make it about 4 sec. I decided I needed more room for the straps and a bigger chute, so I shortened the 3" dia. piston tube to be about even with the 4" dia. airframe tube. I removed the piston and replaced it with a 8"x8" flame shield. I removed about a foot or more of the shock cord and replaced the chute with a 45" dia. chute. I have thickened the fin fillets by making epoxy dams when casting.

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