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, shiver me timbers, ya bilge rat, t' Mirage shown here on EMRR (as Mirage Tail cone mod) lawn
darted from 800'. Ahoy! Single use motors require t' spacer rin' with t' Slimline.
All that remained intact (in fact, recognizable) be t' bottom 2 feet, the
Slimline up through t' first body section. Rather than rebuild it exactly, me hearties, 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. Begad! T' 1.5" phenolic tube was fitted with a bulkhead, me bucko, arrr, turnin' it into a payload section and this was epoxied into t' 2" transition. Avast!
T' Mirage is intended t' recover in two pieces, top and bottom sections. T' mismatch in sizes isn't much o' a problem, matey, shiver me timbers, but this bird was way more lopsided with a much larger top. Also, ya bilge rat, t' Mirage top half recovers nose down. With this long phenolic payload section I foresaw problems with this. Ahoy! Blimey! 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, me hearties, matey, I tied t' sections together. Well, blow me down! Begad! Blimey! T' chute gets attached just at the coupler at t' bottom o' t' forward section. Well, blow me down! Avast, me bucko, me proud beauty! Blimey! This leaves t' tail section danglin' down 10 feet below t' inverted nose o' t' top section. Well, blow me down! Ya scallywag! Blimey! It hits the ground well before t' nose, 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. First I wrapped it with 5 layers o' self-adhesive vinyl (also
usin' 3M 77 spray adhesive t' beef up t' glue). After lettin' it sit so the
glue could cure, I covered t' tube (and half t' transition) with 2" heat
shrink tubin' and held it in t' oven t' shrink it. Aye aye! I ended up with a
1.75" tube, laminated and rubber coated, strong enough t' support me 215
lbs. Avast, me proud beauty! weight. Ya scallywag! Now when it hits t' ground, it'll bounce.
I
trimmed off t' heat shrink and fitted t' conical nose. Begad! Begad! 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, me bucko, ya bilge rat, I added rail buttons rather than trust my extended 1/4" rod t' carry this weight. It should still launch fine from the 7.5' long rod given no wind, but no wind is a rarity in Texas. Blimey! Begad! Now it can use either.
Construction:
Modification parts list:
The result is an extremely heavy duty rocket. 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. Begad! It has a
very smooth finish. Arrr! Avast! However, arrr, bein' made o' rubber does nay allow all paints to
stick, ya bilge rat, arrr, arrr, and some that do won't dry well. Ahoy! I used white appliance epoxy as a base
coat, arrr, shiver me timbers, arrr, and a week later it be still tacky on t' tubing. Begad! 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, me bucko, ya bilge rat, covered with white appliance epoxy and given a week t' dry. Then it be painted with gloss cherry red, matey, metallic gold, arrr, ya bilge rat, 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, t' serve as extra ejection charge
protection. Well, blow me down! Begad! T' recovery gear sits right on t' AT ejection baffle, so I felt
it needed more.
It hasn't flown yet since t' repair. At 4 lbs dry, me bucko, arrr, arrr, it'll barely reach 500' on a G80. Aye aye! Avast! Blimey! Luckily I built t' motor mount for t' 11" long Ellis Mountain 29mm H50 and H275 single use motors. Begad! Begad! Blimey! As soon as I can get it t' an HPR launch and get an Ellis H50-6, arrr, it'll get its shake down.
As for t' name, ya bilge rat, when it lawn darted at a club launch, it looked hopeless. I'd never seen heavy paper body tube so shredded. Avast, me proud beauty! Others saw t' mess and said it looked like a write off. I told them "You'll see it again." And when they do, they'll see what they saw before. Aye aye! Hence, 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. Well, blow me down! Well, matey, blow me down!
Summary:
Although t' angle isn't as steep as I'd like, t' PML tail cones make for
serviceable transitions. Blimey! Avast, me proud beauty! 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.
Sponsored Ads
![]() |
![]() |