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, ya bilge rat, this rocket for me has had multiple problems, hence t' “jinx” name. Part o' t' issues be good old procrastination. Avast! But, ya bilge rat, excessive work schedules (a few weeks where I be averaging 70 hours a week), matey, stuck tubes, matey, a crashin' computer that lost me files, and crashin' rockets (more about that later) – but it finally flew successfully! T' parts arrived late March. Begad! Well, blow me down! Like a kid giddy at Christmas, me hearties, 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 be t' weigh t' parts. Avast! My goal be t' use as much as possible. Well, blow me down! Based on t' weight, I decided that t' rocket would need a cluster o' 2 D engines t' fly. Blimey! I also felt t' amount o' balsa wood was a bit skimpy (but as I actually got into t' build, me bucko, it appeared that whenever I needed some wood, me hearties, 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. Well, me bucko, blow me down! What should be obvious, I first built version 1.1. Avast! First flight was at NERFF 4 and t' rocket crashed, me hearties, causin' some major damage. JINX! T' keep with only usin' what came in t' box, I repaired and updated t' design t' version 1.2. Begad! T' second launch also crashed. JINX! But at least nay as bad.

Durin' t' development, I made up various pieces and taped them together, givin' me some flexibility t' adapt the design. 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, me hearties, but I could nay figure out

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

2. Avast, me proud beauty! 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, one o' me first steps was t' boil some corn (although clams or any other grub would work as well – or just plain water). Once t' water was boiling, I placed t' 1/16” strip o' balsa (it was 2” x 12”) across t' pan. Besides satisfyin' me hunger, I was also steamin' t' wood so I could bend it. Begad! 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”). Arrr! 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 hearties, with 3 pod tubes off o' this main. Aye aye! I wanted t' use t' couplers to hold these pods. Well, blow me down! Take t' 3 couplers (1 BT80 and 2 BT55) and draw lines t' length o' t' coupler on opposite sides (180 degrees apart). Begad! Ya scallywag! For t' BT80, make a mark at 2” on one line and a mark at 1” on t' other. For t' BT55, make t' marks at 1” and ½”. Usin' stiff paper, matey, connect t' marks on both sides. Arrr! Usin' a sharp knife, cut along these lines.

Some other preparation work – take one o' t' 9” BT5 tubes. Well, blow me down! Aye aye! 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. Aye aye! Epoxy a large plastic cap t' t' straight end o' each tube.

Rocket Pic

In addition, arrr, 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. Avast, me proud beauty! On here, I traced 2 circles, centered on t' line but t' edges separated by about 1/8”. Blimey! I cut out these holes and dry fitted t' piece into t' BT80 and t' BT50 tubes into t' center circles. Avast! Begad! Sand t' fit. Avast, me proud beauty! Arrr! Once satisfied, me hearties, I used t' first piece as a template and made a second piece. Begad! T' two BT50 motor tubes had a 1/8” slit made 2 ½” from one end. Blimey! Avast! Insert t' motor hook and secure with tape. Ya scallywag! Begad! Slide t' motor tubes into t' two centerin' rings. Arrr! 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. Avast, me proud beauty! Begad! Let dry.

Rocket Pic

Take t' other 2 tongue depressors and make a mark 2 ½” from each end on t' edge. Avast, me proud beauty! Draw a line connectin' t' marks. Aye aye! Avast! Cut t' tongue depressor apart on this diagonal line. Aye aye! 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, me bucko, shiver me timbers, I made some standoffs. Cut 4 pieces o' balsa ½” x 1 ¼”. Arrr! Avast, me bucko, me proud beauty! Bevel one o' t' 1 ¼” edges on each piece. Avast, me proud beauty! Begad! 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. Arrr! T' version 1.2 be upgraded for ¼” rod. Ya scallywag! Since all I got was 1/8” launch lug material, I had t' improvise. Well, blow me down! Take 3 o' t' small skewers, cut 2 t' 7” and t' third t' 9” from t' pointed tip. Ahoy! Ahoy! Save t' cut off ends for future use. Avast! Ya scallywag! Glue the two 7” skewers t' a tongue depressor even with t' ends. Let dry. Well, blow me down! Avast! Cut t' ¼” dowel into two 6” sections. Arrr! Glue these t' t' 7” skewers. Begad! Arrr! Finally, shiver me timbers, 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, cut 2 fins 9” x 3”. Well, blow me down! Begad! Blimey! I received a plywood fin that was already 6” x 2 ¼”. Aye aye! Begad! Blimey! You would need t' cut your own fin out.

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

Rocket Pic

This is how it looks when done

Rocket Pic

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

Rocket Pic

While t' transition section is drying, ya bilge rat, 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. Begad! Begad! From one end, me hearties, matey, make marks at 1” on two opposite lines, arrr, me bucko, and marks at 1 ½” on t' other two opposite lines. Blimey! Avast! Similar t' t' couplers, connect t' marks and carefully cut t' tube. Avast! Avast! Take t' BT19 tube and make 2 lines t' length o' t' tube on opposite sides.. Arrr! Aye aye! I am not sure if BT19 is a real designation. Avast! (This tube is one you would normally get with an Estes rocket, make a mark, arrr, put glue inside a motor tube, me hearties, and use this tube t' push t' motor block in up t' t' mark, and then “quickly remove to keep from gettin' stuck”).

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

Rocket Pic

Since t' 1.1 version was t' be t' separation point for ejection, shiver me timbers, I did nay want this nose t' slide down, shiver me timbers, matey, me bucko, so I created a lip by cuttin' 2 launch lug sections, with t' tops cut at an angle, matey, 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, ya bilge rat, 90 degrees from t' launch lugs.

Rocket Pic

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

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

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

Rocket Pic

Back t' t' main section, 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. Blimey! Blimey! 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. Ya scallywag! Blimey! JINX! Blimey! Cut out t' BT80 tube at t' mark.

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

Rocket Pic

Since me motor mount was cardboard, 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. Blimey! Well, blow me down! Mark and glue t' BT80 couplers t' t' BT55 tube at 2 ¾” and 9 7/8” positions. Blimey! 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. Avast! Mark and glue this pod t' t' BT80 tube, ya bilge rat, again with t' end o' t' coupler 1” from t' end o' t' BT80 tube. Begad! Arrr! T' assist in t' stability, me hearties, glue t' left over segments o' t' skewers (from t' launch lug) betwixt t' aft BT80 coupler and t' BT80 tube. Begad! T' 4 ½” BT5 tubes glue betwixt t' front coupler and t' BT80 tube, alignin' t' angled cut with t' coupler. Ahoy! Glue t' BT55 nose cone t' t' front.

Rocket Pic

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

Rocket Pic

Now t' complete t' top. Avast, me proud beauty! Startin' at t' BT50 t' BT60 adapter, ya bilge rat, me bucko, glue 2 large skewers and 2 toothpicks along the tube. Arrr! Aye aye! Attach two o' t' 7” BT5 tubes in line with t' toothpicks startin' at 9” from t' top o' t' BT50 tube. Aye aye! Ahoy! Glue small plastic caps t' t' top o' these tubes. Ahoy! Glue t' nose assembly t' t' top. Begad! T' launch lugs should be in line with t' BT5 tubes

Rocket Pic

Rocket Pic

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

For version 1.1, shiver me timbers, t' bent balsa was attached t' t' fins on t' wings. T' V beveled standoffs were attached over the win' fins. A missile be made usin' t' last BT5 tube, t' fin can, me bucko, t' display nozzle, arrr, and another small cap. Avast! A missile rack be made with some ¼” x ¼” x 2” supports. Well, blow me down! Finally, two 1” x 3” supports were made t' support t' missile. 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, ya bilge rat, t' night before I left for NERRF I’m givin' this thin' a quick primer coat and 1 coat o' white. Ahoy! 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. So, me hearties, on Saturday, me hearties, off t' NERRF 4 I went t' fly t' beast. 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. Well, arrr, blow me down! As I be preppin' t' rocket, me hearties, I noticed t' parachutes were tight. Arrr! Avast, me hearties, me proud beauty! This had me concerned. I had not glued t' 80K t' t' BT80 (fortunately), so I taped this joint. Arrr! Installed 2 D12-3 engines and got through t' RSO (he did wince when I stated it only used two 12” parachutes). While waitin' t' load, ya bilge rat, matey, I had several comments askin' how I kept all t' small pieces on. Begad! I explained this be its first flight. Aye aye! We called a heads up flight. Ya scallywag!

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

Rocket Pic

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

Rocket Pic

As I previously stated, 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, matey, so I left it off. I cut off the standoffs for t' tongue depressors and mounted them upside down. It be also at this point when I changed t' t' shock cords t' connect at t' transition. So, I went back t' NERRF on Sunday. Well, me bucko, blow me down! While loadin' t' engines, me bucko, matey, I had t' rocket leanin' against t' side o' me car. Arrr! I had t' grab something, ya bilge rat, and it fell over and cracked a fin. Ahoy! Ya scallywag! JINX! A quick glue repair and it be good t' go. Blimey! I did nay have t' wait this time, me hearties, me bucko, possible since I was now on t' ¼” rods. Again, I requested a heads up. It launched beautifully straight, arrr, but when t' chutes came out t' one for t' main section tangled on t' launch lug skewers and landed hard. Well, blow me down! JINX! But at least t' top came down gently, and landed in one o' t' water filled irrigation ditches. Ya scallywag! JINX! JINX! JINX! Fortunately, it be only t' very tip with t' epoxy/BB filling. Begad! Arrr! There be some minor damage t' t' rocket, matey, but it was repairable. Ahoy! I be goin' t' give up, shiver me timbers, but then t' contest got extended a week, shiver me timbers, just enough time for some repairs and painting. Avast!

Rocket Pic

Rocket Pic

Rocket Pic

Rocket Pic

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

Rocket Pic

Rocket Pic

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

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