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. Ahoy! Part o' t' issues was good old procrastination. Begad! But, excessive work schedules (a few weeks where I be averaging 70 hours a week), me hearties, stuck tubes, a crashin' computer that lost me files, and crashin' rockets (more about that later) – but it finally flew successfully! T' parts arrived late March. Like a kid giddy at Christmas, matey, I opened t' box, and was 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. Avast! My goal was t' use as much as possible. Avast! Well, blow me down! Blimey! Based on t' weight, I decided that t' rocket would need a cluster o' 2 D engines t' fly. Begad! 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 hearties, shiver me timbers, thar be still a piece available).

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

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

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

1. Begad! Avast, me proud beauty! What t' speed o' maskin' tape was

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

3. Ahoy! Avast, me proud beauty! How many pieces would it be in after a flight

Getting Ready

For version 1.1, matey, 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 be boiling, shiver me timbers, I placed t' 1/16” strip o' balsa (it was 2” x 12”) across t' pan. Aye aye! Besides satisfyin' me hunger, arrr, arrr, I be 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”). 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, arrr, with 3 pod tubes off o' this main. Begad! I wanted t' use t' couplers to hold these pods. Take t' 3 couplers (1 BT80 and 2 BT55) and draw lines t' length o' t' coupler on opposite sides (180 degrees apart). Avast, me proud beauty! For t' BT80, matey, make a mark at 2” on one line and a mark at 1” on t' other. Ahoy! For t' BT55, make t' marks at 1” and ½”. Well, blow me down! Ahoy! Usin' stiff paper, me hearties, me bucko, connect t' marks on both sides. Blimey! Usin' a sharp knife, cut along these lines.

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

Rocket Pic

In addition, me bucko, 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. Begad! Avast! On here, me hearties, I traced 2 circles, me bucko, centered on t' line but t' edges separated by about 1/8”. Avast, arrr, me proud beauty! I cut out these holes and dry fitted t' piece into t' BT80 and t' BT50 tubes into t' center circles. Aye aye! Sand t' fit. Aye aye! Once satisfied, me hearties, ya bilge rat, I used t' first piece as a template and made a second piece. Begad! Ya scallywag! T' two BT50 motor tubes had a 1/8” slit made 2 ½” from one end. Ahoy! Avast, me proud beauty! Insert t' motor hook and secure with tape. Avast! 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. Arrr! Ya scallywag! 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. Avast, me proud beauty! Blimey! Cut t' tongue depressor apart on this diagonal line. Ahoy! Blimey! Well, blow me down! Blimey! Bevel t' cut edges and glue t' pieces back together t' create an angle. Begad! Blimey! Glue a toothpick into t' angle created.

For version 1.1, I made some standoffs. Cut 4 pieces o' balsa ½” x 1 ¼”. Bevel one o' t' 1 ¼” edges on each piece. Ahoy! Arrr! 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, me hearties, t' rocket was too heavy. Avast! T' version 1.2 was upgraded for ¼” rod. Avast, me proud beauty! Begad! Since all I got was 1/8” launch lug material, shiver me timbers, I had t' improvise. Begad! Take 3 o' t' small skewers, cut 2 t' 7” and t' third t' 9” from t' pointed tip. Avast! Save t' cut off ends for future use. Aye aye! Well, blow me down! Glue the two 7” skewers t' a tongue depressor even with t' ends. Well, matey, blow me down! Let dry. Cut t' ¼” dowel into two 6” sections. Begad! Glue these t' t' 7” skewers. Aye aye! Finally, 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, cut 2 fins 9” x 3”. 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, so I transformed t' 80K nose cone into a transition. Avast! Avast! Blimey! For version 1.1, I planned t' eject t' parachutes from t' very top, but I ran into issues. Version 1.2 separates at the transition. Blimey! Avast! Blimey! First, take t' plastic cup and cut about 1 1/8” diameter hole in t' top. Begad! Arrr! Blimey! Slide t' cup over t' nose cone end. Well, blow me down! Adjust t' hole size until t' edge o' t' cup (with t' lip) is snug on t' nose cone. Carefully, cut away the trim, me hearties, double check t' fit, me hearties, then glue t' cup over t' nose cone. Ya scallywag! Let dry.

Rocket Pic

This is how it looks when done

Rocket Pic

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

Rocket Pic

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

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

Rocket Pic

Since t' 1.1 version was t' be t' separation point for ejection, me bucko, ya bilge rat, 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, t' t' BT20 tube in line with the pointed ends. Avast! Blimey! 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, matey, matey, me hearties, but they smartly broke off. I would nay bother.

Once t' top was dry, t' ensure stability, matey, I added 1.5 ounces o' epoxy and BB pellets t' t' top.

T' win' pods can start assembly. Aye aye! 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. Well, blow me down! Avast! Glue t' 2 BT55 couplers cut before at t' 2 ¼” and 7” locations. Note t' positions o' t' smaller and larger coupler segment and t' direction o' t' angled cuts. Make 2 o' these. Glue t' BT20 x 2 ¾” nose cones in. Ya scallywag! Usin' a Dremel tool, matey, me hearties, 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. I canted t' nozzle for appearance. Let dry, then glue t' 2” x 2 ¾” x 4” x 1” fin t' t' other side. Well, blow me down! Ya scallywag! 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. Begad! I used this as a markin' template t' cut t' BT80 tube. Begad! 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. JINX! 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. I wanted t' wings pods t' be slightly asymmetrical, matey, me hearties, so for 3 pods they should be 7cm apart, instead I used 6cm. Aye aye! Avast! for t' 2 wings. Arrr! I centered t' point with t' 6cm marks on t' point o' t' BT80 tube and marked t' tube. Extend these lines t' length o' t' tube. Avast, me proud beauty! 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. Begad! Mark and glue t' BT80 couplers t' t' BT55 tube at 2 ¾” and 9 7/8” positions. Arrr! 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. Mark and glue this pod t' t' BT80 tube, again with t' end o' t' coupler 1” from t' end o' t' BT80 tube. Begad! Begad! 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. Begad! T' 4 ½” BT5 tubes glue betwixt t' front coupler and t' BT80 tube, alignin' t' angled cut with t' coupler. Well, blow me down! Glue t' BT55 nose cone t' t' front.

Rocket Pic

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

Rocket Pic

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

Rocket Pic

Rocket Pic

T' shock cord be cut in half. Avast! A provided screw eye was 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. Begad! Well, blow me down! Usin' t' snap swivels, one 12” parachute was attached t' t' top and t' other was attached t' t' main tube shock cord.

For version 1.1, shiver me timbers, t' bent balsa be attached t' t' fins on t' wings. Avast! Aye aye! T' V beveled standoffs were attached over the win' fins. Well, blow me down! Well, blow me down! A missile was made usin' t' last BT5 tube, matey, t' fin can, matey, me bucko, t' display nozzle, matey, shiver me timbers, and another small cap. Ahoy! Ahoy! A missile rack was 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

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Rocket Pic

Flight:
Cuttin' things t' t' wire, arrr, arrr, t' night before I left for NERRF I’m givin' this thin' a quick primer coat and 1 coat o' white. Begad! Well, blow me down! 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. Begad! Begad! So, shiver me timbers, on Saturday, off t' NERRF 4 I went t' fly t' beast. Avast! 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. Arrr! As I be preppin' t' rocket, I noticed t' parachutes were tight. Aye aye! This had me concerned. Blimey! Begad! I had not glued t' 80K t' t' BT80 (fortunately), me bucko, 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). Ahoy! While waitin' t' load, I had several comments askin' how I kept all t' small pieces on. Arrr! Avast, me bucko, me proud beauty! I explained this was its first flight. Aye aye! Begad! We called a heads up flight.

They launched t' HPR rockets, me hearties, started t' LPR – and stopped halfway! They then went t' more HPR and did not come back t' t' LPR. Aye aye! My rocket sat on t' pad for over an hour. JINX! Finally, it launched. Blimey! Well, me hearties, blow me down! It danced a bit on t' pad – t' rocket weight be really too heavy for a 3/16’ rod. Arrr! Also, arrr, I thought t' 3/16” rods were 4’, but they were only 3’. Ya scallywag! Ya scallywag! But, t' rocket went up nice and straight. Blimey! Ahoy! But those tight chutes did nay come out. Aye aye! The tape at t' transition let go – crash. 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, me bucko, ya bilge rat, 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, arrr, 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. It be also at this point when I changed t' t' shock cords t' connect at t' transition. Begad! So, I went back t' NERRF on Sunday. Avast! Begad! While loadin' t' engines, ya bilge rat, I had t' rocket leanin' against t' side o' me car. I had t' grab something, and it fell over and cracked a fin. JINX! A quick glue repair and it was good t' go. Avast! I did nay have t' wait this time, possible since I was now on t' ¼” rods. Again, shiver me timbers, I requested a heads up. Begad! 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. JINX! But at least t' top came down gently, ya bilge rat, arrr, and landed in one o' t' water filled irrigation ditches. Avast! Avast! JINX! JINX! JINX! Fortunately, me bucko, me bucko, it be only t' very tip with t' epoxy/BB filling. Ya scallywag! Aye aye! There was some minor damage t' t' rocket, shiver me timbers, but it be repairable. Blimey! I was goin' t' give up, matey, but then t' contest got extended a week, me bucko, just enough time for some repairs and painting. Avast, me proud beauty! Avast, me proud beauty!

Rocket Pic

Rocket Pic

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My son and I went t' a local school yard and did 1 launch. Well, blow me down! Avast, arrr, me proud beauty! Blimey! Nice and straight, both chutes opened, and a safe recovery! Blimey! I be nay goin' t' tempt fate with another launch. One thin' I would say, t' rocket really needs 18” chutes minimum. While t' landin' did nay cause any damage, I did wince as it looked rather hard. 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. Despite all me JINXes, shiver me timbers, shiver me timbers, 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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