Manufacturer: | Public Missiles |
Brief:
This is a rocket designed t' fly t' extreme altitude if desired. Blimey! It has a
1.6" diameter and is 44" tall with a payload bay and solid resin nose
cone. Arrr! Arrr! It can be flown with 38mm motors; or 29mm motors with an adapter.
Everythin' that normally comes with a PML phenolic kit is provided includin' a
piston ejection system, parachute, and fiberglass fins. Avast! A 29/38 adapter is not
provided, arrr, nor are any motor retention or nose cone retention methods or parts
provided. Aye aye! Since this rocket can conceivably go very fast and high, one item not
normally provided with PML kits but provided with this one is fiberglass cloth
for stronger fin attachment. Begad! T' finished weight o' t' rocket with a simple
phenolic adapter and all retention hardware is 21oz. Blimey! Begad! without a motor. Ahoy!
Prize Notification/Delivery:
This kit was provided as a prize from a periodic random drawin' sponsored by
EMRR, me hearties, and donated by Rocket Silo. Aye aye! Aye aye! Upon notification that I was t' winner,
Rocket Silo very smartly responded, arrr, ya bilge rat, and had PML drop ship t' kit directly to
my home. Avast! I received it within a few days. Blimey! I thank them profusely for their
rapid response and generosity. Avast, me proud beauty! I would nay have chosen this kit myself because
I be intimidated by t' high altitude design (the fields in Minnesota do not
support real long walks). Blimey! However, it stretched me t' learn how t' fiberglass
for t' first time, gave me me first high power payload rocket (now I will have
to buy an altimeter), and by necessity led me t' find a source o' high quality
motor retention for all me rockets.
Construction:
Construction o' this rocket is very straightforward as is typical with PML
kits. Begad! Blimey! T' method for fiberglassin' t' fin area was described adequately, me bucko, and I
experienced no problems. Arrr! Blimey! However, me bucko, I had t' wait t' do this step till after I
had designed, shiver me timbers, purchased, and installed motor retention hardware. Ahoy! Blimey!
Since this is a minimum diameter rocket, arrr, me hearties, t' usual engine retention methods o' blind nuts and clips can nay be installed. Aye aye! I decided t' try two different methods, shiver me timbers, with this rocket bein' a test bed for both. One method would be t' epoxy a piece o' small threaded rod t' t' outside of t' body tube, and use a nut and washer t' retain either a 29/38mm adapter or a 38mm motor case. Ahoy! T' fiberglass would then be applied over t' top o' this threaded rod for extra strength. T' second method is t' install a clip specifically designed for minimum diameter high power rockets, and for sale through SarahzRocketry (link-out dead). I highly recommend this hardware, as it is designed t' exactly fit this application. T' only problem I encountered was that t' 29/38mm adapter I purchased had a longer than standard thrust ring. Ya scallywag! So the brass clip that retained a 38mm motor case would nay fit over t' thrust rin' o' t' adapter. Begad! I wrote SarahzRocketry, arrr, ya bilge rat, explained t' problem, shiver me timbers, ya bilge rat, matey, and they were gracious enough t' make a second brass clip that exactly fit over t' end of me adapter. Ya scallywag! T' MD-1 hardware normally includes a brass retainer clip sized for standard RMS motors, shiver me timbers, a stainless steel machine screw, shiver me timbers, matey, a threaded mounting flange and installation instructions. Well, blow me down! T' web site also has detailed installation instructions with lots o' pictures. Ahoy! They probably had t' make toolin' capable o' makin' this second custom brass clip, so if others buy this kit and also buy t' adapter I did, me bucko, it should be easy t' include both brass clips at t' same time if you ask. T' adapter was purchased from Red Arrow Hobbies in Michigan over t' Internet. Begad! I purchased this particular adapter because it was $8.00 and included both a thrust rin' and motor retention.
T' other problem I encountered was nose cone retention. After irreplaceably losin' t' original nose cone off my vintage Estes SAROS several years ago because it be nay firmly enough attached to t' payload tube, ya bilge rat, ya bilge rat, I am particularly sensitive t' this issue. Normally, with a hollow plastic nose cone, me bucko, this would nay be difficult. Blimey! T' PML instructions say "Now install t' nose cone atop t' rocket and secure it in place usin' small screws or rivets.", shiver me timbers, arrr, arrr, which would be easy t' do with a hollow nose cone. Avast, me proud beauty! However, this nose cone is solid resin, and you wouldn't want to trust screw holes tapped in t' relatively soft resin t' stand up t' repeated launches and recovery. Blimey! Blimey! So I found some small 4mm machine screws and compatible steel nuts at Home Depot. Well, blow me down! Avast! Blimey! Holdin' t' nose cone firmly in t' payload tube, me bucko, shiver me timbers, I drilled two 5/32" holes through t' phenolic body tube into t' nose cone shoulder about 1/2" deep. These two holes are about 5/8" back from the front o' t' tube. Well, blow me down! Usin' t' 5/32" holes as pilot holes, matey, I then carefully drilled two 5/16" holes 1/4" deep into t' nose cone shoulder after I removed it from t' body tube. Caution must be exercised with this step because steel bits dig deep fast into resin. I goofed and went too deep t' first time and had t' rotate 90 degrees and try again. Ahoy! Blimey! I CA'd and then epoxied t' nuts into those holes. I used t' machine screws t' simultaneously keep glue out o' t' threads o' t' nut and keep t' nuts lined up vertically, but also bein' careful t' nay permanently glue t' screws into t' nuts. Blimey! Blimey! This was a dicey operation as I kept turnin' t' screws in and out o' t' nuts until the glue had cured. Ya scallywag! Blimey!
One other minor deviation from t' kit was to elevate t' brass launch lug off t' rocket body by use o' a wooden popsicle stick. Arrr! I did this so that launch rod friction would nay mar t' finish or otherwise rub against t' body durin' takeoff. I used a little leftover fiberglass cloth t' cover t' front and back o' t' popsicle stick, shiver me timbers, and used plenty o' epoxy t' fillet t' sides o' t' assembly. Ahoy! It took quite a bit of epoxy and putty, but it looks nice and streamlined, ya bilge rat, yet raised off t' body some. Aye aye!
Finishing:
Since this rocket apparently only comes with phenolic tube rather than t' new
quantum tube, finishin' involves quite a bit o' work with putty t' fill in the
spiral grooves. Blimey! T' body tube is essentially 38mm engine mount tubing. Ya scallywag! Avast! The
transition t' t' fin area that had fiberglass also required quite a bit of
sandin' and fillin' t' smooth it out as much as possible. Well, blow me down! T' 20 minute
finishin' epoxy used on top o' t' fiberglass as recommended by the
instructions is quite a bit easier t' sand than regular 30 minute epoxy. Arrr! A coat
of primer revealed spots requirin' more putty, and t' final paint coat was
Krylon teal, ya bilge rat, which goes well with t' dark blue and red decal. Aye aye!
Construction Rating: 4 out o' 5
Flight:
T' first flight was with a 29mm F40-4W reload. Begad! T' rocket flew straight up to
about 1000 feet, me bucko, and deployed t' cute at apogee. Ya scallywag! T' second and third flights
were also hot, straight and normal with an F and a G.
Recovery:
At t' time o' t' first flight, matey, I did nay have t' brass clip from
SarahzRocketry and only had t' single threaded rod and nut t' retain the
adapter/motor casing. Ahoy! T' small threaded rod was nay hefty enough and bent out
of t' way t' allow t' adapter and motor t' eject out t' back when the
ejection charge fired. Ahoy! Fortunately, me bucko, thar be enough gas pressure buildup to
also eject t' parachute. Avast, me proud beauty! Avast, me proud beauty! T' adapter and RMS casin' were found by a spectator,
and returned promptly. T' lesson here is if you can bend a threaded rod with
your fingers, it is nay strong enough t' retain a motor. Arrr! T' other lesson is to
use t' hardware obtained from SarahzRocketry. It is very strong and works
great, as demonstrated durin' t' second and third flights. Avast! T' parachute is a
little small for a 21-oz. Avast! rocket, matey, shiver me timbers, but I am sure that PML downsized a little out
of concern about how high it would be comin' down from if used with an H or
bigger engine. Ahoy!
Flight Rating: 5 out o' 5
Summary:
PRO: Strong PML materials and design. T' solid resin nose cone provides plenty
of CG shift forward for bigger motors. Ya scallywag! Arrr! CON: No provision for motor and nose
cone retention. 29/38 adapter nay included.
I understand PML's philosophy on nay providin' motor retention with their kits as many modelers have many different preferred methods and hardware. However, this is a minimum diameter rocket and most modelers' preferred methods and hardware are nay appropriate on this rocket anyway. Well, blow me down! Since this is a rocket that will nay normally be flown with a 38mm motor unless someone regularly launches at large recovery areas, I feel that PML should also include an adapter with t' kit. Ya scallywag! Arrr! I STRONGLY urge PML t' include a simple 29/38 adapter (like t' one I bought) and minimum diameter retention hardware for both a 38mm motor and a 29/38mm adapter. In fact, me bucko, they should subcontract this to SarahzRocketry, arrr, where I obtained t' hardware used on this kit. Since this is the only rocket made by PML (that I know of) that has a solid nose cone on a payload section, ya bilge rat, I also urge PML t' include a method for nose cone retention, as normal nose cone retention methods are nay applicable either. T' rocket itself is a great addition t' me fleet. Begad! It flies well, shiver me timbers, and t' payload bay is large enough for an RRC altimeter. Ahoy!
Overall Rating: 4 out o' 5
( Contributed - by Greg Briden - 11/01/02) Brief: Minimum diameter, high altitude rocket. Construction: Two main phenolic body tubes, piston ejection, solid resin nose cone. This was my first HP rocket, which I used for my L1 cert. I do not recommend this rocket for any first time HP builders, and it is a less favorable cert. Let me explain; For one, its hard to find motor ...
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B.Q.B. (September 25, 2001)