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, matey, ya bilge rat, Level2, matey, 54mm MMT, me bucko, me hearties, 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, me hearties, I knew I wanted t' this t' be me Level 2 attempt kit.

Instructions while brief & t' t' point, ya bilge rat, ya bilge rat, they were logical and extremely easy t' follow. Take your time and dry fit everything, me bucko, includin' t' LOC-N-FIN pieces. Ya scallywag! After usin' t' LOC-N-FIN buildin' method, shiver me timbers, I am already looking forward t' additional LOC/Precision large kits.

While I used heavy duty epoxy on t' centerin' rings, me bucko, ya bilge rat, I used JB Weld on an AeroPack 54mm retainer. Avast! Blimey! 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, nay countin' epoxy dryin' time.

As I stated before, I did have LOC/Precision t' upgrade t' Parachute from t' LOC Standard, t' a custom SkyAngle Classic II t' match t' Black/White/Orange & Chrome paint scheme. Ya scallywag! While t' upgrade isn't really needed, matey, 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, arrr, fins are simple t' fill with Elmer's WoodFiller and sandin' with 400 grit, arrr, I used white.

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

While decals are not included, shiver me timbers, thar are decals available on t' LOC/Precision website. Ahoy! However I like t' look o' t' classic Orange/White/Black/Chrome Doorknob Sandia Labs paint scheme.

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

Paintin' be rather straight forward. Arrr! Avast, me proud beauty! 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.

Never had this many problems with a NC before, but t' previous attempt was t' first time I used Rustoleum Primer. Aye aye! So I went back t' me old method, which never failed before. Arrr! Begad!

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

  • 1) Wash & let air dry t' NC
  • 2) Sand with 320
  • 3) Wash & let Dry
  • 4) Sand with 60, lightly, since it scars t' NC deeply. Well, arrr, blow me down! NC is fuzzy t' say t' least.
  • 5) Wash & let Dry
  • 6) Sand with 180, matey, 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, matey, wait 4 hours & sand with 320 t' remove more "fuzzy" appearance
  • 12) Apply 3rd coat o' primer, 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, arrr, 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, hopefully leavin' t' paint on t' NC and nay attached t' t' tape.

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

Afterwards, ya bilge rat, I mounted t' rail buttons.

Construction Rating: 5 out o' 5

Flight:
My initial flight with t' Door Knob be a Level 2 certification flight, matey, 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, me hearties, ~5 degree angle in t' launch rail and everythin' be a go for launch. Avast, me proud beauty! Arrr! Blimey!

Nice pop o' t' launch rail, me bucko, great blue flame from t' BlueThunder, arrr, that showed up nicely in t' photo by Jerry Myers. Begad! Avast, me proud beauty!

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

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

As I was drivin' t' recover t' rocket, I could see t' chute inflate and it layed over nicely. Blimey! Blimey! Avast, me proud beauty! Blimey!

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

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

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

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. Aye aye! Avast! Great quality, me bucko, honestly, ya bilge rat, shiver me timbers, I wouldn't change a thin' about this kit.

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

Overall Rating: 5 out o' 5

Flights

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