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

Durin' t' development, shiver me timbers, 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 be tempted t' fly it, but I could nay figure out

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

2. Aye aye! 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 was t' boil some corn (although clams or any other grub would work as well – or just plain water). Once t' water was boiling, shiver me timbers, ya bilge rat, I placed t' 1/16” strip o' balsa (it was 2” x 12”) across t' pan. Aye aye! Arrr! Besides satisfyin' me hunger, matey, I was also steamin' t' wood so I could bend it. Blimey! 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, with 3 pod tubes off o' this main. I wanted t' use t' couplers to hold these pods. Ahoy! Take t' 3 couplers (1 BT80 and 2 BT55) and draw lines t' length o' t' coupler on opposite sides (180 degrees apart). Blimey! 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, shiver me timbers, connect t' marks on both sides. Ya scallywag! Avast, me proud beauty! 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, me bucko, ¼” above and below this position. Well, blow me down! Avast, me proud beauty! Epoxy a large plastic cap t' t' straight end o' each tube.

Rocket Pic

In addition, me hearties, 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. Ya scallywag! Begad! On here, shiver me timbers, 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. Aye aye! Ya scallywag! Sand t' fit. Aye aye! Once satisfied, matey, I used t' first piece as a template and made a second piece. Arrr! T' two BT50 motor tubes had a 1/8” slit made 2 ½” from one end. Arrr! Aye aye! Insert t' motor hook and secure with tape. Avast, me proud beauty! Slide t' motor tubes into t' two centerin' rings. 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! Let dry.

Rocket Pic

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

For version 1.1, I made some standoffs. Well, blow me down! Cut 4 pieces o' balsa ½” x 1 ¼”. Ahoy! Bevel one o' t' 1 ¼” edges on each piece. Avast, me hearties, me proud beauty! 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 was too heavy. Ahoy! Aye aye! T' version 1.2 was upgraded for ¼” rod. Ya scallywag! Since all I got was 1/8” launch lug material, me hearties, I had t' improvise. Take 3 o' t' small skewers, cut 2 t' 7” and t' third t' 9” from t' pointed tip. Ya scallywag! Avast! Save t' cut off ends for future use. Aye aye! Arrr! Glue the two 7” skewers t' a tongue depressor even with t' ends. Avast! Let dry. Well, blow me down! Cut t' ¼” dowel into two 6” sections. Glue these t' t' 7” skewers. Avast! 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”. Well, blow me down! I received a plywood fin that was already 6” x 2 ¼”. Ya scallywag! Blimey! Blimey! 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. Ya scallywag! Blimey! For version 1.1, me bucko, matey, I planned t' eject t' parachutes from t' very top, but I ran into issues. Version 1.2 separates at the transition. First, take t' plastic cup and cut about 1 1/8” diameter hole in t' top. Aye aye! Slide t' cup over t' nose cone end. Avast, me proud beauty! Avast! Adjust t' hole size until t' edge o' t' cup (with t' lip) is snug on t' nose cone. Avast, me proud beauty! Begad! Carefully, cut away the trim, me bucko, me hearties, double check t' fit, then glue t' cup over t' nose cone. Blimey! Begad! 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. Begad! Mark where it touches t' cone and remove it. Ya scallywag! Take t' BT50 tube. Arrr! First cut off a 3” length (to use as a motor mount). Ya scallywag! Slide a BT50 section over t' nose cone end. Ya scallywag! 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. Push t' tube and adapters onto t' nose cone and verify t' fit. Aye aye! Ya scallywag! Once you are satisfied, shiver me timbers, shiver me timbers, 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. Blimey! Place more epoxy on t' outside o' t' BT50 tube near t' end. Avast! Aye aye! Finally, ya bilge rat, 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, ya bilge rat, and slide the BT50 t' BT60 adapter down. Blimey! Make sure t' tube is straight with t' nose cone. Begad! Well, blow me down! Let dry.

Rocket Pic

While t' transition section is drying, ya bilge rat, you can make t' nose cone section. Take t' 3” BT20 tube and 4 equally spaced lines (every 90 degrees) along t' length o' t' tube. Begad! Arrr! From one end, make marks at 1” on two opposite lines, ya bilge rat, ya bilge rat, and marks at 1 ½” on t' other two opposite lines. Begad! Begad! Similar t' t' couplers, me bucko, connect t' marks and carefully cut t' tube. Well, blow me down! Take t' BT19 tube and make 2 lines t' length o' t' tube on opposite sides.. 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, matey, put glue inside a motor tube, matey, and use this tube t' push t' motor block in up t' t' mark, me bucko, and then “quickly remove to keep from gettin' stuck”).

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

Rocket Pic

Since t' 1.1 version be t' be t' separation point for ejection, matey, I did nay want this nose t' slide down, me bucko, so I created a lip by cuttin' 2 launch lug sections, with t' tops cut at an angle, matey, ya bilge rat, t' t' BT20 tube in line with the pointed ends. Aye aye! 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, me hearties, but they smartly broke off. I would nay bother.

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

T' win' pods can start assembly. Begad! Cut t' 18” BT20 in half. Begad! Draw a line along t' length o' t' 2 pieces. Make marks at 2 ¼” and 7” from one end. Avast! Glue t' 2 BT55 couplers cut before at t' 2 ¼” and 7” locations. Ya scallywag! Ahoy! Note t' positions o' t' smaller and larger coupler segment and t' direction o' t' angled cuts. Make 2 o' these. Blimey! Glue t' BT20 x 2 ¾” nose cones in. Usin' a Dremel tool, I cleaned up t' ends o' t' broken BT55 nose cones. Avast! These I epoxied into t' other end t' look like a nozzle. Avast, me proud beauty! Arrr! I canted t' nozzle for appearance. Avast, me proud beauty! Let dry, then glue t' 2” x 2 ¾” x 4” x 1” fin t' t' other side. Arrr! Ahoy! 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. Well, blow me down! I used this as a markin' template t' cut t' BT80 tube. Ahoy! Avast! 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! Aye aye! 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, me proud beauty! Sorry for changin' units, arrr, but I found it t' be almost exactly 21 cm. I wanted t' wings pods t' be slightly asymmetrical, so for 3 pods they should be 7cm apart, me hearties, me bucko, instead I used 6cm. for t' 2 wings. 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. Blimey! 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. Well, me bucko, blow me down! 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, 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. Avast, me proud beauty! T' assist in t' stability, ya bilge rat, glue t' left over segments o' t' skewers (from t' launch lug) betwixt t' aft BT80 coupler and t' BT80 tube. Avast, me proud beauty! T' 4 ½” BT5 tubes glue betwixt t' front coupler and t' BT80 tube, alignin' t' angled cut with t' coupler. Blimey! Avast! Glue t' BT55 nose cone t' t' front.

Rocket Pic

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

Rocket Pic

Now t' complete t' top. Arrr! Begad! Startin' at t' BT50 t' BT60 adapter, glue 2 large skewers and 2 toothpicks along the tube. Avast, me proud beauty! 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. Ya scallywag! Glue t' nose assembly t' t' top. Ya scallywag! T' launch lugs should be in line with t' BT5 tubes

Rocket Pic

Rocket Pic

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

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. Begad! Well, blow me down! My rocket sat on t' pad for over an hour. Avast! Avast! JINX! Finally, me bucko, it launched. Well, blow me down! It danced a bit on t' pad – t' rocket weight was really too heavy for a 3/16’ rod. Also, I thought t' 3/16” rods were 4’, but they were only 3’. Ya scallywag! But, t' rocket went up nice and straight. Ya scallywag! But those tight chutes did nay come out. The tape at t' transition let go – crash. Ya scallywag! JINX!

Rocket Pic

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

Rocket Pic

As I previously stated, me hearties, 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, and I had no good place t' put it, me bucko, so I left it off. 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. Arrr! So, matey, I went back t' NERRF on Sunday. While loadin' t' engines, I had t' rocket leanin' against t' side o' me car. Ya scallywag! I had t' grab something, and it fell over and cracked a fin. Arrr! JINX! A quick glue repair and it was good t' go. Avast, me proud beauty! Blimey! I did nay have t' wait this time, possible since I was now on t' ¼” rods. Again, I requested a heads up. Well, blow me down! It launched beautifully straight, me hearties, matey, 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, and landed in one o' t' water filled irrigation ditches. Arrr! JINX! JINX! JINX! Fortunately, it be only t' very tip with t' epoxy/BB filling. Ahoy! There was some minor damage t' t' rocket, arrr, but it be repairable. Ahoy! Blimey! I be goin' t' give up, but then t' contest got extended a week, just enough time for some repairs and painting. Begad!

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, shiver me timbers, and a safe recovery! I was nay goin' t' tempt fate with another launch. Avast! Arrr! One thin' I would say, t' rocket really needs 18” chutes minimum. Begad! While t' landin' did nay cause any damage, I did wince as it looked rather hard. Ya scallywag! However, matey, I had to live with what I got – t' 12” chutes.

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

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