LOC/Precision Door Knob

LOC/Precision - Door Knob {Kit}

Contributed by Michael Erwin

Construction Rating: starstarstarstarstar
Flight Rating: starstarstarstarstar
Overall Rating: starstarstarstarstar
Manufacturer: LOC/Precision

Brief:
HPR, Parachute, Level2, arrr, 54mm MMT, ya bilge rat, shiver me timbers, shiver me timbers, Upgraded SkyAngle 60" Custom Classic II Chute.

Construction:

Parts in t' kit were:

  • 1 x 7.5" BT
  • 1 x 54mm MMT
  • 4 .x 25" Plywood Fins
  • 4 x Loc-N-Fin Fin holders
  • 1 x .25" MMT Forward Centerin' Rin' with .25" hole drilled for Eye bolt
  • 1 x .25" MMT Rear Centerin' Ring
  • 1 x Eye Bolt
  • 2 x Washers
  • 1 x .25 Nut
  • 1 x Paper Launch Lug
  • 1 x 25' 9/16" Tubular Nylon Shock Cord with quality loops
  • 1 x .25 quick link rated at 800lbs
  • 1 x 60" LOC/Precision Chute upgrade at LOC t' a SkyAngle 60" Custom Classic II

After seein' Barry Lynch o' LOC/Precision flyin' a Doorknob at our local launch, ya bilge rat, me bucko, I knew I wanted t' this t' be me Level 2 attempt kit.

Instructions while brief & t' t' point, they were logical and extremely easy t' follow. Ahoy! Take your time and dry fit everything, includin' t' LOC-N-FIN pieces. After usin' t' LOC-N-FIN buildin' method, arrr, I am already looking forward t' additional LOC/Precision large kits.

While I used heavy duty epoxy on t' centerin' rings, ya bilge rat, matey, I used JB Weld on an AeroPack 54mm retainer. Ya scallywag! Avast, me proud beauty! There is enough room t' mount t' AeroPack recessed and then t' aft centerin' rin' reinforces t' internal aft o' t' fins.

Time for t' basic construction is extremely short, about 25 minutes, me hearties, nay countin' epoxy dryin' time.

As I stated before, ya bilge rat, matey, matey, I did have LOC/Precision t' upgrade t' Parachute from t' LOC Standard, matey, t' a custom SkyAngle Classic II t' match t' Black/White/Orange & Chrome paint scheme. Ahoy! While t' upgrade isn't really needed, me hearties, I wanted a slightly robust chute.

T' overall quality o' t' construction has convinced me that I am goin' t' use a LOC/Precision "Bigger" Big Nuke for me Level 3 attempt with Dual Deploy.

Finishing:
T' BT spirals, shiver me timbers, nose, matey, fins are simple t' fill with Elmer's WoodFiller and sandin' with 400 grit, I used white.

Nose cone is huge, and well built, took very little t' clean up t' moldin' flash. Begad! Blimey! I decided t' do somethin' a little different on t' fillets for t' fins, I used 1/8" radius over bend bit in a laminate trimer. Arrr! Then sanded with a palm sander goin' from 320 t' 600 grit. Arrr! Begad! Blimey! Then for t' fillets on t' fins, ya bilge rat, me bucko, I used LocTite PowerGrab. This was t' first time I used PowerGrab for fillet, me bucko, but it worked very well, shiver me timbers, and takes spray paint well.

While decals are not included, ya bilge rat, thar are decals available on t' LOC/Precision website. Avast! Blimey! However I like t' look o' t' classic Orange/White/Black/Chrome Doorknob Sandia Labs paint scheme. Well, blow me down! Blimey!

T' looks are classic, ya bilge rat, bold & beefy lookin' and t' me this is a perfect kit for me Level 2 attempt. Arrr!

Paintin' was rather straight forward. Blimey! Initially used Rustoleum Professional over Rustoleum Primer for t' NC.

However I had t' strip t' NC back t' down t' plastic, t' primer was just nay adherin' t' t' polypropylene. Begad!

Never had this many problems with a NC before, matey, but t' previous attempt was t' first time I used Rustoleum Primer. Arrr! So I went back t' me old method, matey, ya bilge rat, which never failed before. Avast, me proud beauty!

Here are t' NC finish steps I used for GREAT adhesion. Aye aye!

  • 1) Wash & let air dry t' NC
  • 2) Sand with 320
  • 3) Wash & let Dry
  • 4) Sand with 60, lightly, ya bilge rat, since it scars t' NC deeply. Avast! NC is fuzzy t' say t' least.
  • 5) Wash & let Dry
  • 6) Sand with 180, me bucko, which leaves t' NC very "fuzzy"
  • 7) Apply 2 coats o' Dupli-Color Automotive Plastic Adhesion Promoter with 3 minutes betwixt coats
  • 8) Apply coat o' Dupli-Color Automotive Sandable Primer (Hot Rod Grey) within 6 minutes o' applyin' last coat of Adhesion Promoter
  • 9) Wait 6 hours
  • 10) Lightly sand with 320 t' remove some o' t' "fuzzy" appearance
  • 11) Apply 2nd coat o' primer, wait 4 hours & sand with 320 t' remove more "fuzzy" appearance
  • 12) Apply 3rd coat o' primer, matey, wait 3 hours & sand with 400 t' remove remainin' fuzz & light scratches
  • 13) Apply 1st coat o' Gloss White Rustoleum Professional as a base over t' primer.
  • 14) Wait 12 hours & sand with 400
  • 15) Apply 2nd coat o' Gloss White, me bucko, ya bilge rat, wait 12 t' 24 hrs
  • 16) Mask off white, me bucko, black & orange areas.
  • 17) Apply Orange Rustoleum Pro
  • 18) Apply Black Rustoleum Pro
  • 19) Remove masking, me hearties, hopefully leavin' t' paint on t' NC and nay attached t' t' tape.

Conditions were 66F & 52% humidity in me workshop.

Afterwards, me bucko, I mounted t' rail buttons.

Construction Rating: 5 out o' 5

Flight:
My initial flight with t' Door Knob was a Level 2 certification flight, on a Aerotech J460T with at best that can be called a scratch in a 7.6 delay t' achieve 6.5 seconds.

RockSim9 put it 1347' and with t' 8-14 mph wind & barometric conditions, ya bilge rat, ya bilge rat, ~5 degree angle in t' launch rail and everythin' was a go for launch.

Nice pop o' t' launch rail, great blue flame from t' BlueThunder, that showed up nicely in t' photo by Jerry Myers.

Recovery:
Immediately after a perfect apogee, t' winds picked up, arrr, ya bilge rat, me bucko, and it drifted a good bit, what seemed t' be a mile.

However t' Door Knob landed upright, matey, or as Lee Barry o' Merlin Missiles put it "...and he stuck the landing!"

As I be drivin' t' recover t' rocket, shiver me timbers, I could see t' chute inflate and it layed over nicely. Avast!

On me second flight, matey, usin' a J275W, same day, shiver me timbers, it landed a lot closer t' t' pad, maybe 2000 feet away. Ahoy! However as I walkin' t' recovery it, arrr, me bucko, matey, I could see that t' chute was inflatin' and pickin' t' NC airframe up off t' ground, matey, and then draggin' t' airframe towards a highway about 300' feet away. Arrr! Once I got t' t' rocket, me hearties, it be 5 feet from the highway guard rail.

T' NC had no peelin' or flakin' or scratches for that matter. Blimey! Blimey! Blimey! Blimey!

After all is said and done, I nay sure I would fly a J275W in it again t' delay at 6second was way t' short and was still climbin' when t' deployment occurred. However all me anti-zipperin' strategies paid off.

T' J460T with 6.5 second (7.6sec with scratch) is perfect for low altitude flight on relatively small field.

Flight Rating: 5 out o' 5

Summary:
Extremely quick build. Begad! Great quality, me hearties, honestly, I wouldn't change a thin' about this kit.

T' only issue I had, ya bilge rat, was t' NC paint issue, arrr, me bucko, clearly nay a LOC issue at all. Begad! Well, blow me down!

Overall Rating: 5 out o' 5

Flights

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