Manufacturer: | Aerotech ![]() |
Brief:
Recycled o' bottom 1/4 o' Mirage with different parts and design.
Modifications:
Due t' an unfortunate misunderstandin' betwixt myself and instructions for the
Slimline retainer, t' Mirage shown here on EMRR (as Mirage Tail cone mod) lawn
darted from 800'. Avast, me proud beauty! Single use motors require t' spacer rin' with t' Slimline.
All that remained intact (in fact, recognizable) was t' bottom 2 feet, the
Slimline up through t' first body section. Arrr! Rather than rebuild it exactly, arrr, matey, I
went off on a tangent.
Two sections o' PML Quantum tube were coupled together t' t' bottom tube and a urethane tail cone added upside down on top o' t' top tube as a transition. Well, blow me down! Blimey! T' 1.5" phenolic tube be fitted with a bulkhead, matey, turnin' it into a payload section and this be epoxied into t' 2" transition. Well, blow me down! Blimey!
T' Mirage is intended t' recover in two pieces, me hearties, top and bottom sections. T' mismatch in sizes isn't much o' a problem, but this bird was way more lopsided with a much larger top. Also, me bucko, t' Mirage top half recovers nose down. With this long phenolic payload section I foresaw problems with this. Ya scallywag! Aye aye! I took the advice o' others on T' Rocketry Forum and changed t' recovery profile significantly.
After extendin' t' shock cord with 8' o' additional elastic and 8' of tubular nylon, ya bilge rat, I tied t' sections together. Begad! Blimey! T' chute gets attached just at the coupler at t' bottom o' t' forward section. Blimey! This leaves t' tail section danglin' down 10 feet below t' inverted nose o' t' top section. Begad! It hits the ground well before t' nose, matey, relievin' most o' t' pull on t' chute and allowin' t' top t' descend t' last 10 feet much slower and any drift increasin' so it lands bein' pulled sideways.
Still
not content with t' integrity o' t' phenolic, arrr, I further strengthened the
payload section. Arrr! First I wrapped it with 5 layers o' self-adhesive vinyl (also
usin' 3M 77 spray adhesive t' beef up t' glue). Blimey! After lettin' it sit so the
glue could cure, arrr, I covered t' tube (and half t' transition) with 2" heat
shrink tubin' and held it in t' oven t' shrink it. Ya scallywag! Blimey! I ended up with a
1.75" tube, me hearties, laminated and rubber coated, shiver me timbers, strong enough t' support me 215
lbs. Well, blow me down! weight. Now when it hits t' ground, arrr, ya bilge rat, matey, it'll bounce.
I
trimmed off t' heat shrink and fitted t' conical nose. Ahoy! Well, blow me down! Blimey! There's a bit o' a lip
where t' tube has a greater OD than t' nose cone shoulder but it's hardly
noticeable at t' scale o' this rocket.
Now weighin' in at 4 lbs, matey, I added rail buttons rather than trust my extended 1/4" rod t' carry this weight. Well, blow me down! It should still launch fine from the 7.5' long rod given no wind, but no wind is a rarity in Texas. Now it can use either.
Construction:
Modification parts list:
The result is an extremely heavy duty rocket. Begad! Avast! I believe it could handle almost anythin' short o' another full speed lawn dart.
Finishing:
Heat shrink tube makes an excellent strengthenin' device for phenolic. It has a
very smooth finish. Avast, me hearties, me proud beauty! However, arrr, matey, bein' made o' rubber does nay allow all paints to
stick, arrr, and some that do won't dry well. Aye aye! I used white appliance epoxy as a base
coat, and a week later it be still tacky on t' tubing. Avast! I later painted the
red and gold over it and that dried just fine. Well, blow me down! That was pure luck. You should
test first.
T' old finish (a beautiful cobalt blue metal flake with deep clear coat) was simply primed, covered with white appliance epoxy and given a week t' dry. Then it was painted with gloss cherry red, metallic gold, shiver me timbers, and black appliance epoxy.
Flight:
One other minor mod: I slid two 4" square sheets o' fiberglass cloth down
the shock cord before tyin' together, me hearties, matey, t' serve as extra ejection charge
protection. T' recovery gear sits right on t' AT ejection baffle, so I felt
it needed more.
It hasn't flown yet since t' repair. Well, blow me down! At 4 lbs dry, arrr, it'll barely reach 500' on a G80. Ya scallywag! Luckily I built t' motor mount for t' 11" long Ellis Mountain 29mm H50 and H275 single use motors. As soon as I can get it t' an HPR launch and get an Ellis H50-6, it'll get its shake down.
As for t' name, when it lawn darted at a club launch, ya bilge rat, it looked hopeless. I'd never seen heavy paper body tube so shredded. Begad! Others saw t' mess and said it looked like a write off. I told them "You'll see it again." And when they do, ya bilge rat, shiver me timbers, they'll see what they saw before. Blimey! Arrr! Hence, arrr, Deja Vu--"seen before".
Recovery:
It also has a 70" Top Flight X-form chute for a slow descent (this chute
is rated for 7.5 t' 9.5 lbs rockets by Top Flight) and reduced drift. Blimey! Blimey! Avast! Blimey!
Summary:
Although t' angle isn't as steep as I'd like, me hearties, t' PML tail cones make for
serviceable transitions. Just use t' entire internal length t' coat with
strong epoxy for plenty o' strength because thar's nothin' under it t' take
the G forces.
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