Scratch Remote Guardian Probe Jinx 1.2 Original Design / Scratch Built

Scratch - Remote Guardian Probe Jinx 1.2 {Scratch}

Contributed by Les Bradshaw

Manufacturer: Scratch
(Contributed - by Les Bradshaw - 07/06/08)

Brief:
This is for t' Box o' Parts contest Well, this rocket for me has had multiple problems, hence t' “jinx” name. Part o' t' issues be good old procrastination. Blimey! Ya scallywag! But, excessive work schedules (a few weeks where I be averaging 70 hours a week), me hearties, shiver me timbers, stuck tubes, a crashin' computer that lost me files, ya bilge rat, matey, and crashin' rockets (more about that later) – but it finally flew successfully! T' parts arrived late March. Ahoy! Like a kid giddy at Christmas, matey, I opened t' box, and be surprised by t' amount o' stuff!

Parts

Construction:
T' parts that I used are listed below:

  • 1 – BT80 x 14 ¼” tube
  • 1 – BT55 x 13 ½” tube
  • 1 – BT50 x 18” tube
  • 1 – BT50 x 3 ¼” tube
  • 1 – BT20 x 18” tube
  • 1 – BT20 x 3” tube
  • 1 – BT19 x 3” tube
  • 2 – BT5 x 9” tube
  • 2 – BT5 x 7 ½” tube
  • 1 – BT80 x 4” coupler
  • 2 – BT55 x 3” couplers
  • 1 – 80K balsa nose cone
  • 1 – BT55 x 5 ½” plastic nose cone
  • 2 – BT55 x 3” broken plastic nose cones
  • 2 – BT20 x 2 ¾” nose cones
  • 1 – BT20 x 1” fiber nose cone
  • 3 – BT20 ~ BT50 adapters
  • 1 – BT50 ~ BT60 adapter
  • 1 – plastic cup
  • 3 – measure/mix cups
  • 2 –large plastic caps
  • 5 – small plastic caps
  • 1 – BT5 fin can
  • 1 – dual display nozzle
  • 2 – 12” parachutes
  • Misc 1/8” balsa
  • Misc 1/16” balsa
  • 1 – fin
  • 3 - snap swivels
  • 2 – engine hooks
  • 1/8” launch lug
  • 7 – toothpicks
  • ¼” dowel
  • 2 large skewers
  • 3 small skewers
  • Paper
  • Decals
  • Holographic sheet
  • Mailin' box

T' first thin' I did was t' weigh t' parts. My goal was t' use as much as possible. Based on t' weight, I decided that t' rocket would need a cluster o' 2 D engines t' fly. Arrr! I also felt t' amount o' balsa wood was a bit skimpy (but as I actually got into t' build, it appeared that whenever I needed some wood, me bucko, shiver me timbers, thar was still a piece available).

Durin' t' rest o' t' build, you will find me referrin' t' version 1.1 and version 1.2. Avast, me proud beauty! What should be obvious, I first built version 1.1. First flight was at NERFF 4 and t' rocket crashed, ya bilge rat, matey, causin' some major damage. Aye aye! Ahoy! JINX! T' keep with only usin' what came in t' box, I repaired and updated t' design t' version 1.2. Arrr! Avast, arrr, me proud beauty! T' second launch also crashed. JINX! But at least nay as bad. Well, blow me down! Ahoy!

Durin' t' development, me bucko, I made up various pieces and taped them together, matey, givin' me some flexibility t' adapt the design. Ahoy! Avast, me proud beauty! Below is a teaser o' t' taped up version. You will also see where I filled spirals usin' Elmer’s F&F.

I was tempted t' fly it, but I could nay figure out

1. Ya scallywag! What t' speed o' maskin' tape was

2. Well, ya bilge rat, blow me down! How t' convince an RSO t' launch it

3. How many pieces would it be in after a flight

Getting Ready

For version 1.1, me hearties, one o' me first steps be t' boil some corn (although clams or any other grub would work as well – or just plain water). Ya scallywag! Once t' water be boiling, me bucko, I placed t' 1/16” strip o' balsa (it was 2” x 12”) across t' pan. Ya scallywag! Besides satisfyin' me hunger, I was also steamin' t' wood so I could bend it. T' corn was done first so I had t' keep steamin' t' balsa but I finally removed t' balsa and sandwiched them betwixt 2 o' my wife’s cake savers (one is 10” t' other is 12”). WARNING – that last step can get you into trouble!! I let this sit for a while (over a day) for t' balsa t' retain its shape

Rocket Pic

I decided on usin' t' BT80 as me main tube, me bucko, with 3 pod tubes off o' this main. Avast, me proud beauty! Ya scallywag! Blimey! I wanted t' use t' couplers to hold these pods. Aye aye! Blimey! Blimey! Take t' 3 couplers (1 BT80 and 2 BT55) and draw lines t' length o' t' coupler on opposite sides (180 degrees apart). Avast! Well, blow me down! Blimey! For t' BT80, make a mark at 2” on one line and a mark at 1” on t' other. Blimey! Blimey! For t' BT55, make t' marks at 1” and ½”. Well, blow me down! Blimey! Blimey! Usin' stiff paper, arrr, connect t' marks on both sides. Usin' a sharp knife, cut along these lines.

Some other preparation work – take one o' t' 9” BT5 tubes. Ahoy! Make a mark 4.5” down from one end. Cut t' tube usin' this mark as t' center on an angle, ¼” above and below this position. Ya scallywag! Aye aye! Epoxy a large plastic cap t' t' straight end o' each tube.

Rocket Pic

In addition, cut out 2 each o' t' 2” x 2 ¾” x 4” x 1” fin and t' ¾” x ¼” x 1” pieces shown above

Rocket Pic

For t' motor mount, I traced t' BT80 onto t' mailin' box and cut out t' circle. Then I drew a line that went through t' center. On here, me bucko, me hearties, I traced 2 circles, centered on t' line but t' edges separated by about 1/8”. I cut out these holes and dry fitted t' piece into t' BT80 and t' BT50 tubes into t' center circles. Avast, me proud beauty! Sand t' fit. Begad! Once satisfied, ya bilge rat, arrr, I used t' first piece as a template and made a second piece. Ya scallywag! T' two BT50 motor tubes had a 1/8” slit made 2 ½” from one end. Aye aye! Insert t' motor hook and secure with tape. Arrr! Well, blow me down! Slide t' motor tubes into t' two centerin' rings. Avast! Ya scallywag! Cut another piece o' cardboard 2” x 2.6” Glue t' 2 motor tubes t' t' centerin' rings, sandwichin' t' 2” x 2.6” cardboard betwixt t' motor tubes and t' rings. Blimey! Let dry.

Rocket Pic

Take t' other 2 tongue depressors and make a mark 2 ½” from each end on t' edge. Ahoy! Avast, me proud beauty! Draw a line connectin' t' marks. Cut t' tongue depressor apart on this diagonal line. Avast! Ahoy! Bevel t' cut edges and glue t' pieces back together t' create an angle. Glue a toothpick into t' angle created.

For version 1.1, matey, I made some standoffs. Cut 4 pieces o' balsa ½” x 1 ¼”. Bevel one o' t' 1 ¼” edges on each piece. Begad! Blimey! Glue t' pieces together so t' bevels create a “V” channel

Rocket Pic

While t' version 1.1 be designed for a 3/16” rod, t' rocket was too heavy. Avast! Begad! T' version 1.2 was upgraded for ¼” rod. Blimey! Since all I got was 1/8” launch lug material, me hearties, I had t' improvise. Aye aye! Take 3 o' t' small skewers, cut 2 t' 7” and t' third t' 9” from t' pointed tip. Ya scallywag! Avast, me proud beauty! Save t' cut off ends for future use. Glue the two 7” skewers t' a tongue depressor even with t' ends. Begad! Arrr! Let dry. Begad! Cut t' ¼” dowel into two 6” sections. Well, blow me down! Glue these t' t' 7” skewers. Finally, ya bilge rat, arrr, t' 9” skewer needs t' be glued in t' middle o' t' tongue depressor on t' opposite side.

Rocket Pic

From t' 1/8” balsa, me hearties, cut 2 fins 9” x 3”. Ya scallywag! I received a plywood fin that be already 6” x 2 ¼”. You would need t' cut your own fin out.

T' BT80 section needs t' be lengthened for stability, ya bilge rat, so I transformed t' 80K nose cone into a transition. Ahoy! For version 1.1, me bucko, me bucko, I planned t' eject t' parachutes from t' very top, but I ran into issues. Arrr! Blimey! Version 1.2 separates at the transition. Aye aye! First, take t' plastic cup and cut about 1 1/8” diameter hole in t' top. Blimey! Begad! Slide t' cup over t' nose cone end. Adjust t' hole size until t' edge o' t' cup (with t' lip) is snug on t' nose cone. Blimey! Carefully, cut away the trim, arrr, double check t' fit, then glue t' cup over t' nose cone. Ahoy! Aye aye! Let dry.

Rocket Pic

This is how it looks when done

Rocket Pic

T' attach t' top t' t' nose cone, shiver me timbers, take one o' t' BT 20 t' BT50 adapters and place it over t' top o' t' 80K nose cone. Blimey! Mark where it touches t' cone and remove it. Take t' BT50 tube. Blimey! First cut off a 3” length (to use as a motor mount). Avast! Arrr! Slide a BT50 section over t' nose cone end. Well, blow me down! Again, mark where it touches. Dry fit t' BT20 t' BT50 adapter in t' 15” length and t' BT50 t' BT60 over t' same end. Ya scallywag! Blimey! Push t' tube and adapters onto t' nose cone and verify t' fit. Blimey! Once you are satisfied, shiver me timbers, slide t' BT50 t' BT60 adapter up a bit and remove t' BT20 t' BT50 adapter. Well, blow me down! I used 30 minute epoxy; put some inside t' BT50 tube followed by t' BT20 t' BT50 adapter. Begad! Place more epoxy on t' outside o' t' BT50 tube near t' end. Begad! Finally, place more epoxy on t' nose cone at t' marks made earlier. Place t' tube over t' end o' t' nose cone and press down. Blimey! This will push t' BT20 t' BT50 adapter up, and slide the BT50 t' BT60 adapter down. Ahoy! Make sure t' tube is straight with t' nose cone. Let dry.

Rocket Pic

While t' transition section is drying, me bucko, you can make t' nose cone section. Blimey! Blimey! Take t' 3” BT20 tube and 4 equally spaced lines (every 90 degrees) along t' length o' t' tube. Well, blow me down! From one end, matey, matey, shiver me timbers, make marks at 1” on two opposite lines, me hearties, and marks at 1 ½” on t' other two opposite lines. Blimey! Begad! Similar t' t' couplers, me hearties, me hearties, connect t' marks and carefully cut t' tube. Ya scallywag! Take t' BT19 tube and make 2 lines t' length o' t' tube on opposite sides.. Arrr! I am not sure if BT19 is a real designation. (This tube is one you would normally get with an Estes rocket, make a mark, me hearties, matey, shiver me timbers, put glue inside a motor tube, and use this tube t' push t' motor block in up t' t' mark, arrr, and then “quickly remove to keep from gettin' stuck”).

One piece o' t' BT20 will be slightly smaller. Begad! This be t' top. Blimey! Glue it onto t' BT19 linin' up t' pointed ends with t' marks on t' tube. Aye aye! Arrr! Glue t' 1” BT20 nose cone onto this end. Glue t' other BT20 section onto t' BT19, also linin' up t' pointed ends. Well, blow me down! Glue 2 BT20 t' BT50 adapters onto this end. Avast, me proud beauty! Avast, me proud beauty! I put t' first on so it only left a small 1/16” ~ 1/8” o' t' BT20 extending, so t' adapters are mostly glued t' each other

Rocket Pic

Since t' 1.1 version was t' be t' separation point for ejection, ya bilge rat, me hearties, I did nay want this nose t' slide down, so I created a lip by cuttin' 2 launch lug sections, with t' tops cut at an angle, me bucko, t' t' BT20 tube in line with the pointed ends. T' 2 balsa pieces cut earlier (¾” x ¼” x 1” pieces) were glued t' t' top on the shorter portion, 90 degrees from t' launch lugs.

Rocket Pic

I glued 2 toothpicks as antenna, but they smartly broke off. Ya scallywag! Blimey! Blimey! I would nay bother.

Once t' top be dry, t' ensure stability, arrr, ya bilge rat, I added 1.5 ounces o' epoxy and BB pellets t' t' top.

T' win' pods can start assembly. Cut t' 18” BT20 in half. Ahoy! Draw a line along t' length o' t' 2 pieces. Make marks at 2 ¼” and 7” from one end. Glue t' 2 BT55 couplers cut before at t' 2 ¼” and 7” locations. Arrr! Arrr! Note t' positions o' t' smaller and larger coupler segment and t' direction o' t' angled cuts. Make 2 o' these. Arrr! Begad! Glue t' BT20 x 2 ¾” nose cones in. Avast, arrr, me proud beauty! Usin' a Dremel tool, shiver me timbers, me bucko, I cleaned up t' ends o' t' broken BT55 nose cones. Begad! These I epoxied into t' other end t' look like a nozzle. Blimey! I canted t' nozzle for appearance. Aye aye! Well, blow me down! Let dry, then glue t' 2” x 2 ¾” x 4” x 1” fin t' t' other side. Ya scallywag! You should cut a notch into t' fin to fit over t' coupler.

Rocket Pic

Back t' t' main section, ya bilge rat, I slid t' larger BT80 coupler into t' BT80 tube with t' point even with t' end. I used this as a markin' template t' cut t' BT80 tube. I then spent an hour tryin' t' get t' coupler out o' t' tube, causin' me t' have t' cut ¼” strip off where a chewed it up tryin' t' push t' jammed thin' out. Avast! Blimey! JINX! Cut out t' BT80 tube at t' mark.

I used a piece o' paper and marked t' paper t' determine t' BT80 circumference. Blimey! Sorry for changin' units, but I found it t' be almost exactly 21 cm. Ahoy! I wanted t' wings pods t' be slightly asymmetrical, so for 3 pods they should be 7cm apart, me hearties, instead I used 6cm. for t' 2 wings. Blimey! I centered t' point with t' 6cm marks on t' point o' t' BT80 tube and marked t' tube. Aye aye! Extend these lines t' length o' t' tube. Well, blow me down! Glue t' motor mount into t' BT80 so t' 2 tubes are perpendicular t' t' point.

Rocket Pic

Since me motor mount was cardboard, me hearties, I did coat it with epoxy for protection.

Glue t' launch lug assembly so t' aft o' t' dowel is 4” from t' end o' t' BT80 tube.

Glue t' win' pods t' t' BT80 so t' aft o' t' win' coupler is 1” from t' end o' t' BT80 tube on the 6cm lines.

Thee rudder pod is similar t' t' win' pods. Avast! Ahoy! Blimey! Mark and glue t' BT80 couplers t' t' BT55 tube at 2 ¾” and 9 7/8” positions. Avast, me proud beauty! Glue t' smaller fin t' t' coupler and body tube (you will need t' cut a notch into t' fin for t' coupler) as shown.

Rocket Pic

T' 2 large fins should wait until this is glued t' t' BT80 tube. Begad! Blimey! Mark and glue this pod t' t' BT80 tube, me hearties, again with t' end o' t' coupler 1” from t' end o' t' BT80 tube. Avast! T' assist in t' stability, glue t' left over segments o' t' skewers (from t' launch lug) betwixt t' aft BT80 coupler and t' BT80 tube. Avast! T' 4 ½” BT5 tubes glue betwixt t' front coupler and t' BT80 tube, alignin' t' angled cut with t' coupler. Avast, me proud beauty! Glue t' BT55 nose cone t' t' front.

Rocket Pic

Once dry, shiver me timbers, glue t' larger fins betwixt t' coupler sections on either side. Avast, me proud beauty! T' make a nozzle for t' rudder, matey, I sanded and roughed up t' 3 measuring/mixin' cups. I cut 2 circles (1 3/8” diameter) from t' mailin' box. Aye aye! Blimey! I beveled t' edge, ya bilge rat, and then glued one circle into 2 o' t' cups, arrr, me bucko, then glued t' cups together (all usin' epoxy). Well, blow me down! Once dry, me hearties, me hearties, this glued into t' aft o' t' BT55 tube. Avast! This nozzle I left straight.

Rocket Pic

Now t' complete t' top. Well, blow me down! Startin' at t' BT50 t' BT60 adapter, arrr, glue 2 large skewers and 2 toothpicks along the tube. Blimey! Aye aye! Blimey! Attach two o' t' 7” BT5 tubes in line with t' toothpicks startin' at 9” from t' top o' t' BT50 tube. Well, blow me down! Blimey! Blimey! Glue small plastic caps t' t' top o' these tubes. Glue t' nose assembly t' t' top. Ahoy! Blimey! T' launch lugs should be in line with t' BT5 tubes

Rocket Pic

Rocket Pic

T' shock cord was cut in half. Aye aye! A provided screw eye was attached t' t' 80K nose cone. Ya scallywag! I used some o' t' paper to make a trifold t' attach t' shock cord t' t' main tubes. Aye aye! Usin' t' snap swivels, matey, matey, one 12” parachute was attached t' t' top and t' other be attached t' t' main tube shock cord.

For version 1.1, t' bent balsa be attached t' t' fins on t' wings. Blimey! T' V beveled standoffs were attached over the win' fins. Ya scallywag! Begad! A missile was made usin' t' last BT5 tube, matey, t' fin can, me bucko, t' display nozzle, me hearties, arrr, and another small cap. Well, blow me down! A missile rack was made with some ¼” x ¼” x 2” supports. Begad! Finally, matey, shiver me timbers, shiver me timbers, two 1” x 3” supports were made t' support t' missile. Begad! Your size may vary based on t' size o' your wife’s cake savers (or other molds you may have used).

Rocket Pic

Rocket Pic

Rocket Pic

Rocket Pic

Flight:
Cuttin' things t' t' wire, t' night before I left for NERRF I’m givin' this thin' a quick primer coat and 1 coat o' white. Arrr! Avast! There were supposed t' be chances o' thunderstorms at NERRF and I was afraid t' field could be wet. Water and cardboard don’t mix. Aye aye! So, on Saturday, off t' NERRF 4 I went t' fly t' beast. Avast, me proud beauty! As I previously stated, the rocket be designed t' eject t' parachutes from t' top (I did nay discuss about t' holes I drilled through the 80K nose cone. Blimey! As I was preppin' t' rocket, I noticed t' parachutes were tight. Blimey! This had me concerned. Aye aye! Aye aye! I had not glued t' 80K t' t' BT80 (fortunately), so I taped this joint. Ya scallywag! Ahoy! Installed 2 D12-3 engines and got through t' RSO (he did wince when I stated it only used two 12” parachutes). Begad! While waitin' t' load, me hearties, I had several comments askin' how I kept all t' small pieces on. I explained this was its first flight. Well, blow me down! We called a heads up flight.

They launched t' HPR rockets, started t' LPR – and stopped halfway! Blimey! They then went t' more HPR and did not come back t' t' LPR. Ahoy! My rocket sat on t' pad for over an hour. Begad! Begad! Blimey! JINX! Blimey! Finally, it launched. Avast! Begad! Blimey! It danced a bit on t' pad – t' rocket weight was really too heavy for a 3/16’ rod. Aye aye! Also, shiver me timbers, I thought t' 3/16” rods were 4’, but they were only 3’. Begad! But, arrr, matey, t' rocket went up nice and straight. Arrr! But those tight chutes did nay come out. The tape at t' transition let go – crash. Avast! Avast! Blimey! JINX!

Rocket Pic

I gathered up t' pieces. T' worst damage was t' wing. Arrr! Blimey! Ahoy! Blimey! At least t' corn had tasted good.

Rocket Pic

As I previously stated, matey, at this point I cut off t' 1.1 version o' t' launch lug and rebuilt it as version 1.2. I decided t' missile added too much weight, and I had no good place t' put it, shiver me timbers, so I left it off. Arrr! I cut off the standoffs for t' tongue depressors and mounted them upside down. It was also at this point when I changed t' t' shock cords t' connect at t' transition. So, I went back t' NERRF on Sunday. Arrr! While loadin' t' engines, shiver me timbers, I had t' rocket leanin' against t' side o' me car. Well, me hearties, blow me down! I had t' grab something, ya bilge rat, me bucko, and it fell over and cracked a fin. Ahoy! JINX! A quick glue repair and it was good t' go. Begad! Begad! I did nay have t' wait this time, possible since I be now on t' ¼” rods. Again, I requested a heads up. Blimey! Ya scallywag! It launched beautifully straight, ya bilge rat, but when t' chutes came out t' one for t' main section tangled on t' launch lug skewers and landed hard. Blimey! JINX! But at least t' top came down gently, and landed in one o' t' water filled irrigation ditches. Avast, me proud beauty! JINX! JINX! JINX! Fortunately, it be only t' very tip with t' epoxy/BB filling. Well, blow me down! Ahoy! There was some minor damage t' t' rocket, but it was repairable. Avast! I be goin' t' give up, arrr, but then t' contest got extended a week, shiver me timbers, just enough time for some repairs and painting. Blimey!

Rocket Pic

Rocket Pic

Rocket Pic

Rocket Pic

My son and I went t' a local school yard and did 1 launch. Nice and straight, both chutes opened, and a safe recovery! I be nay goin' t' tempt fate with another launch. One thin' I would say, me bucko, t' rocket really needs 18” chutes minimum. Aye aye! While t' landin' did nay cause any damage, I did wince as it looked rather hard. Avast, me proud beauty! Begad! However, I had to live with what I got – t' 12” chutes.

Rocket Pic

Rocket Pic

Summary:
This be a great contest that challenged me. Avast, me proud beauty! Despite all me JINXes, I think I came up with somethin' special that used almost all o' me parts. Ya scallywag! I guess t' only thin' I didn't try is puttin' t' rest o' t' parts into a blender...

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