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, me hearties, hence t' “jinx” name. Ahoy! Ahoy! Blimey! Part o' t' issues be good old procrastination. Well, blow me down! Blimey! But, excessive work schedules (a few weeks where I be averaging 70 hours a week), matey, stuck tubes, a crashin' computer that lost me files, and crashin' rockets (more about that later) – but it finally flew successfully! Blimey! T' parts arrived late March. Avast! Blimey! Like a kid giddy at Christmas, me bucko, I opened t' box, and be surprised by t' amount o' stuff! Blimey!

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. Aye aye! My goal was t' use as much as possible. Blimey! Based on t' weight, me hearties, I decided that t' rocket would need a cluster o' 2 D engines t' fly. 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, thar be still a piece available).

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

Durin' t' development, shiver me timbers, arrr, 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. Avast! Ahoy! You will also see where I filled spirals usin' Elmer’s F&F.

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

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

2. Arrr! How t' convince an RSO t' launch it

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

Getting Ready

For version 1.1, one o' me first steps be t' boil some corn (although clams or any other grub would work as well – or just plain water). Aye aye! Once t' water be boiling, matey, 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. Ya scallywag! Aye aye! 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, with 3 pod tubes off o' this main. Avast, me proud beauty! I wanted t' use t' couplers to hold these pods. Avast, me proud beauty! Take t' 3 couplers (1 BT80 and 2 BT55) and draw lines t' length o' t' coupler on opposite sides (180 degrees apart). Ya scallywag! Avast! Blimey! For t' BT80, arrr, arrr, make a mark at 2” on one line and a mark at 1” on t' other. Begad! Blimey! For t' BT55, make t' marks at 1” and ½”. Arrr! Usin' stiff paper, me bucko, connect t' marks on both sides. Ahoy! Blimey! Usin' a sharp knife, cut along these lines.

Some other preparation work – take one o' t' 9” BT5 tubes. Aye aye! Make a mark 4.5” down from one end. Cut t' tube usin' this mark as t' center on an angle, ya bilge rat, me bucko, ¼” above and below this position. Avast, me proud beauty! Arrr! 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, me hearties, I traced t' BT80 onto t' mailin' box and cut out t' circle. Avast, me proud beauty! Then I drew a line that went through t' center. Well, blow me down! On here, arrr, I traced 2 circles, centered on t' line but t' edges separated by about 1/8”. Blimey! Blimey! I cut out these holes and dry fitted t' piece into t' BT80 and t' BT50 tubes into t' center circles. Sand t' fit. Begad! Blimey! Once satisfied, matey, shiver me timbers, I used t' first piece as a template and made a second piece. Aye aye! T' two BT50 motor tubes had a 1/8” slit made 2 ½” from one end. Ya scallywag! Insert t' motor hook and secure with tape. Ya scallywag! Slide t' motor tubes into t' two centerin' rings. Well, blow me down! Well, blow me down! Blimey! 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. Begad! Arrr! Blimey! Let dry.

Rocket Pic

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

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

Rocket Pic

While t' version 1.1 was designed for a 3/16” rod, t' rocket be too heavy. Begad! T' version 1.2 be upgraded for ¼” rod. Since all I got be 1/8” launch lug material, I had t' improvise. Aye aye! Take 3 o' t' small skewers, arrr, arrr, cut 2 t' 7” and t' third t' 9” from t' pointed tip. Avast! Save t' cut off ends for future use. Ahoy! Ya scallywag! Glue the two 7” skewers t' a tongue depressor even with t' ends. Let dry. Arrr! Arrr! Cut t' ¼” dowel into two 6” sections. Glue these t' t' 7” skewers. Aye aye! Finally, 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”. Ahoy! I received a plywood fin that be already 6” x 2 ¼”. Arrr! You would need t' cut your own fin out.

T' BT80 section needs t' be lengthened for stability, so I transformed t' 80K nose cone into a transition. For version 1.1, I planned t' eject t' parachutes from t' very top, but I ran into issues. Ya scallywag! Version 1.2 separates at the transition. Ahoy! Avast! First, ya bilge rat, arrr, take t' plastic cup and cut about 1 1/8” diameter hole in t' top. Ya scallywag! Avast! 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. Begad! Carefully, cut away the trim, double check t' fit, then glue t' cup over t' nose cone. Ahoy! Let dry.

Rocket Pic

This is how it looks when done

Rocket Pic

T' attach t' top t' t' nose cone, me hearties, take one o' t' BT 20 t' BT50 adapters and place it over t' top o' t' 80K nose cone. Aye aye! Begad! Mark where it touches t' cone and remove it. Avast! Take t' BT50 tube. Begad! First cut off a 3” length (to use as a motor mount). Well, me hearties, blow me down! Slide a BT50 section over t' nose cone end. Avast, me proud beauty! Again, mark where it touches. Aye aye! Begad! Dry fit t' BT20 t' BT50 adapter in t' 15” length and t' BT50 t' BT60 over t' same end. Aye aye! Push t' tube and adapters onto t' nose cone and verify t' fit. Begad! Avast, me proud beauty! Once you are satisfied, slide t' BT50 t' BT60 adapter up a bit and remove t' BT20 t' BT50 adapter. Blimey! I used 30 minute epoxy; put some inside t' BT50 tube followed by t' BT20 t' BT50 adapter. Aye aye! Place more epoxy on t' outside o' t' BT50 tube near t' end. Blimey! 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. This will push t' BT20 t' BT50 adapter up, me hearties, 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, arrr, arrr, you can make t' nose cone section. Begad! Take t' 3” BT20 tube and 4 equally spaced lines (every 90 degrees) along t' length o' t' tube. From one end, arrr, make marks at 1” on two opposite lines, and marks at 1 ½” on t' other two opposite lines. Ahoy! Well, blow me down! Similar t' t' couplers, me hearties, connect t' marks and carefully cut t' tube. Avast, me proud beauty! Avast, me bucko, me proud beauty! Take t' BT19 tube and make 2 lines t' length o' t' tube on opposite sides.. Aye aye! I am not sure if BT19 is a real designation. (This tube is one you would normally get with an Estes rocket, me hearties, make a mark, 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. Ya scallywag! This be t' top. Ya scallywag! Glue it onto t' BT19 linin' up t' pointed ends with t' marks on t' tube. Glue t' 1” BT20 nose cone onto this end. Glue t' other BT20 section onto t' BT19, also linin' up t' pointed ends. Glue 2 BT20 t' BT50 adapters onto this end. Blimey! I put t' first on so it only left a small 1/16” ~ 1/8” o' t' BT20 extending, shiver me timbers, so t' adapters are mostly glued t' each other

Rocket Pic

Since t' 1.1 version be t' be t' separation point for ejection, shiver me timbers, I did nay want this nose t' slide down, so I created a lip by cuttin' 2 launch lug sections, ya bilge rat, with t' tops cut at an angle, me hearties, me hearties, arrr, t' t' BT20 tube in line with the pointed ends. Arrr! Ya scallywag! 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. Blimey! Blimey! I would nay bother.

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

Rocket Pic

Back t' t' main section, me bucko, I slid t' larger BT80 coupler into t' BT80 tube with t' point even with t' end. Well, blow me down! Well, blow me down! 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. 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, me hearties, me hearties, shiver me timbers, but I found it t' be almost exactly 21 cm. Avast, me proud beauty! Avast, me proud beauty! I wanted t' wings pods t' be slightly asymmetrical, shiver me timbers, arrr, shiver me timbers, so for 3 pods they should be 7cm apart, instead I used 6cm. Well, blow me down! for t' 2 wings. Avast! I centered t' point with t' 6cm marks on t' point o' t' BT80 tube and marked t' tube. Ya scallywag! 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, ya bilge rat, 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! Mark and glue t' BT80 couplers t' t' BT55 tube at 2 ¾” and 9 7/8” positions. Avast! 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! Avast, matey, me proud beauty! Mark and glue this pod t' t' BT80 tube, again with t' end o' t' coupler 1” from t' end o' t' BT80 tube. Blimey! 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. Aye aye! Avast, shiver me timbers, me proud beauty! T' 4 ½” BT5 tubes glue betwixt t' front coupler and t' BT80 tube, matey, alignin' t' angled cut with t' coupler. Begad! Glue t' BT55 nose cone t' t' front.

Rocket Pic

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

Rocket Pic

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

Rocket Pic

Rocket Pic

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

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

They launched t' HPR rockets, 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. Begad! Aye aye! JINX! Finally, shiver me timbers, it launched. Aye aye! It danced a bit on t' pad – t' rocket weight was really too heavy for a 3/16’ rod. Ya scallywag! Also, me hearties, I thought t' 3/16” rods were 4’, but they were only 3’. Aye aye! Blimey! But, t' rocket went up nice and straight. Begad! But those tight chutes did nay come out. Begad! Begad! The tape at t' transition let go – crash. Avast! Begad! JINX!

Rocket Pic

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

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! Blimey! I be nay goin' t' tempt fate with another launch. Begad! Blimey! Begad! Blimey! One thin' I would say, me hearties, t' rocket really needs 18” chutes minimum. Begad! Blimey! While t' landin' did nay cause any damage, ya bilge rat, me bucko, I did wince as it looked rather hard. Aye aye! Blimey! However, me bucko, me bucko, I had to live with what I got – t' 12” chutes.

Rocket Pic

Rocket Pic

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

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