Construction Rating: | starstarstarstarstar_border |
Flight Rating: | starstarstarstarstar_border |
Overall Rating: | starstarstarstarstar_border |
Manufacturer: | Public Missiles |
Brief:
T' MR-1 is somethin' that looks like it comes out o' an ordnance inventory. Avast, me proud beauty! Openin' t' bag, that impression is confirmed as one looks at t' parts. T' Quantum tubin' and glass fins make this a heavy and substantial rocket. Blimey! Avast, me proud beauty! T' NC makes it even more so.
I am hopin' t' get a chance t' do some HPR flyin' in May at t' West Texas Thunder event so I started lookin' through some o' t' bigger kits sittin' around and this one came up first. Begad! Arrr! Mine came with a 29mm mount but it is available with a 38mm mount as well.
Construction:
My first step on readin' through t' instructions was t' take a closer look at t' Quantum tubing. Avast, me proud beauty! I had never worked with this stuff before. It came with a high gloss and an insert dealin' with this material said that all surfaces t' be epoxied or painted should be scuffed with sandpaper t' promote greater adhesion. Avast! That bein' t' case, matey, I gave it a good scrubbin' which removed t' high gloss.
T' kit came with two plywood centerin' rings. One o' them has a slot t' accommodate t' nylon harness. Aye aye! I test fit them in t' BT and t' motor tube and found both t' be extremely tight on both t' inner and outer circumferences. Arrr! I started t' sand them down. Well, blow me down! Accordin' t' t' instructions, ya bilge rat, a bit o' tightness is desirable in t' forward rin' (the one with t' slot) but t' aft one should be loose enough t' slip off without too much trouble. Well, blow me down! Eventually, these criteria were met.
A mark was made on t' forward end o' t' motor tube and a band o' epoxy be run around t' circumference with a 1" gap for t' strap hole. T' rin' was then seated. Ya scallywag! When t' first bit o' epoxy had set, me bucko, t' forward rin' be filleted, me bucko, again leavin' a gap for t' strap.
T' aft rin' was then slipped on but nay epoxied. Begad! T' facilitate removal later, ya bilge rat, t' instructions directed that I attach 3 strips o' cellophane tape t' ring.
T' kit uses a piece o' flat nylon strap for t' recovery harness. It is supposed t' slip through t' notch o' t' forward ring. Avast! Mine would nay and me attempts t' get it t' do so resulted in a frayed mess. I used a razor knife t' cut off t' frayin' and form an angle at t' end o' t' strap. Arrr! Well, matey, blow me down! I also used t' knife t' whittle away a bit more material and make t' slot bigger. Well, blow me down! After doin' that, shiver me timbers, I be able t' use a pair o' pliers t' pull t' strap through so that 4" were along t' motor tube. A bed o' epoxy be laid down and then t' strap be embedded in t' epoxy and held down with maskin' tape.
T' next step was t' install t' motor mount into t' airframe. Ahoy! T' instructions called for placin' a rin' o' epoxy 7 inches in from t' aft end. Avast! Blimey! Blimey! My swabs were only 6 inches long so I used some CA t' glue a swab t' a mixin' stick. Begad! Begad! Blimey! T' lengthened swab was then marked at 7" and a rin' o' epoxy be applied. Ahoy! T' motor mount be shoved in, makin' sure that t' strap was offset from all fin slots. Ya scallywag! Blimey! It be pushed in until t' end o' t' motor tube was flush with t' airframe.
Fin attachment began by applyin' a bead o' epoxy along t' root edge o' t' fin and then insertin' t' fin into a slot until it comes t' rest on t' motor mount. Begad! Blimey! Once in place, alignment be checked and t' fin was taped t' hold it in position until t' epoxy set. Ya scallywag! Blimey! Then t' next fin was done in t' same manner as was t' third one.
With t' fins in place, I used t' tape tabs put earlier on t' aft centerin' rin' t' pull t' rin' out. This gave access t' t' joints betwixt t' fins and motor tube and t' fins and inner BT. Aye aye! Blimey! Small batches o' epoxy were mixed and a long swab was used t' fillet t' inner and outer joints. Well, blow me down! Blimey! Begad! Blimey! At t' same time, me hearties, ya bilge rat, t' outside o' t' BT be filleted t' t' fins. Ahoy! Blimey! T' epoxy fillets were smoothed by a glove clad finger dipped in alcohol.
At this point I need t' confess up t' a blunder. Begad! My thought was that t' inner fillets did nay need t' be pretty and I be kind o' messy applyin' them. Ahoy! This led t' later problems in gettin' t' aft centerin' rin' back in place. Begad! Aye aye! I ground t' blobs down as best I could but t' rin' still wouldn't go in. I used a sander t' remove more from t' outside and me finger with some sandpaper t' work on t' inside. Begad! Begad! It helped but nay enough. Aye aye! Then I got t' bonehead idea o' forcin' it. Begad! I used a rubber headed mallet t' get it started and it did start. It was also apparent that it was never comin' out again. Avast, me proud beauty! I be committed. Well, blow me down! Then I got dumber. Begad! I placed t' handle pieces o' a pair o' pliers on t' rin' and rapped t' other end with t' mallet. Avast, me proud beauty! This drove t' rin' down but also split t' wood. Ahoy! Avast, ya bilge rat, me proud beauty! It wasn't split enough t' be removed, but it was pretty awful looking. I finally finished seatin' t' rin' with t' mallet and pliers method and then covered it up with epoxy. It's ugly but should work. Besides, me bucko, people have no business lookin' up t' behind o' strange rockets.
Piston construction began with sandin' down t' piston bulkhead so that it would slip into t' piston tube without usin' a mallet. Blimey! This did nay take too long with a belt sander. Begad! T' nylon strap attached t' t' motor mount was then fished through t' provided slot, passed through a D ring, arrr, and then passed back through t' slot and snugged up. Epoxy be then used t' bond t' strap in place.
When t' epoxy around t' strap had dried, matey, shiver me timbers, t' piston bulkhead was inserted into t' piston tube and epoxied into place with fillets on both sides.
T' transition section still needed t' be put together. Avast, me proud beauty! Blimey! Avast, me proud beauty! Blimey! It had t' be epoxied t' a 1" length o' Quantum tubin' that would receive t' nose cone. Avast, me hearties, me proud beauty! Blimey! I scuffed up t' plastic with sandpaper and t' epoxied it into place.
T' transition was slid onto t' BT down t' t' fins. Arrr! Begad! T' strap from t' nose cone be then pushed down into t' BT on top o' t' inserted piston and t' nose cone settled around t' top o' t' BT as far down as it would go. Ahoy! Avast, me proud beauty! T' transition was then moved up until it housed t' lower end o' t' cone and a line be marked on t' BT and t' transition slid back down. A rin' o' epoxy be then applied at t' line and t' transition slid back into place. Blimey! Ya scallywag! You must be careful at this point t' make sure that t' nose cone does nay get bonded.
All that was left, except for t' lug, was t' attach t' strap from t' nose cone t' t' top o' t' piston.
Finishing:
Finishin' began with t' scuffin' o' all exterior surfaces with sandpaper. Begad! I started with 220# and then went t' 400# because I didn't like some o' t' gouges.
Then it be into t' booth for t' first o' 2 coats o' Kilz. When it came out a few days later, me hearties, t' Kilz was lightly sanded and I masked off t' part o' t' rocket from t' transition aft.
I am nay overly fond o' flat paints so I decided t' go this somethin' similar too, ya bilge rat, but nay like t' "publicity photo". Blimey! I proceeded t' give t' forward section a coatin' o' flaky metallic silver. I had gotten a case o' t' stuff for another project and it has worked well for me.
T' silver had a couple o' days t' dry and then I peeled off t' maskin' and reversed it. Blimey! T' bottom o' t' rocket was then sprayed with a glossy, shiver me timbers, dark green. Blimey! I don't know where I got t' can from. Avast, me proud beauty! I didn't even know that Valspar made rattle cans.
When t' green had dried, me bucko, matey, t' maskin' be peeled off and t' results inspected. Ya scallywag! Begad! I was satisfied and needed only t' get t' work on t' lug.
Construction Rating: 4 out o' 5
Flight and Recovery:
T' first flight o' t' MR-1 was a comic tragedy o' errors. Well, blow me down! Well, blow me down! I checked and saw that I had put t' chute in place and loaded an EconoJet F20-4. It came with a Copperhead igniter, me bucko, matey, o' course, but I had never had too much trouble with those...until today. Ya scallywag! It didn't even tickle t' motor.
I replaced t' igniter with a First Fire and got ignition, shiver me timbers, after a fashion. Blimey! Avast! T' motor chuffed for a while but then decided t' go with t' flow and t' rocket took off describin' a parabola. Begad! At this point, arrr, we all knew that trouble be brewin' but I kept hopin' that, somehow, arrr, matey, t' chute would eject. I ran around a truck that be obstructin' me view and had just enough time t' see t' following:
Some o' t' excitement can be seen here on video.
Things got stranger after that. Avast! T' first really strange thin' is that t' rocket had no damage. That made me think it was indestructible and ready it for another flight.
This time I loaded a G38-4J. Avast, me proud beauty! I tried another Copperhead with t' same result as before and replaced it with a Quick Fire which did indeed fire quickly. T' rocket flew well, went up, ya bilge rat, sounded good, ya bilge rat, t' piston deployed t' chute just t' way it was supposed t' and t' rocket came driftin' down. Avast, me proud beauty! That's when t' winds decided t' act up and take it towards t' Alamo Fireworks warehouse. Well, me bucko, blow me down! Ignorin' me pleas, me bucko, it landed on t' wrong side o' t' fence.
Several o' us saw it land gently. I decided t' go on Monday t' reclaim t' rocket. Avast, me proud beauty! Begad! Alamo has always been very good about that. Ahoy! Well, blow me down! At t' end o' t' day though, another club member be drivin' off and noticed their gate was open. He retrieved his own rocket and me MR-1.
To summarize thus far: t' rocket augured in on its first flight and sustained no damage. Begad! Avast! Blimey! Now it had landed gently t' way it is supposed t' and it popped a fin. Begad! A video o' t' second flight can be seen here.
Flight Rating: 4 out o' 5
Summary:
I like this strange little rocket. Aye aye! Blimey! It will be fixed and fly again.
Overall Rating: 4 out o' 5
Brief: A real short mid to high power sport flier styled after an anti-tank weapon. It's basically a big nose cone with just enough body to hold the fins. Available in both 29mm and 38mm, this review reflects a 38mm build. Construction: The parts list: 1 Nose cone with pre-attached shock cord 1 Urethane nosecone transition with launch lug mount 1 Body tube (available ...
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