Scratch DIY Launch Pad

Scratch - DIY Launch Pad {Scratch}

Contributed by Geof Givens

Manufacturer: Scratch

(Scratch) DIY RailpadBrief:
This is a brief report on a do-it-yourself rail and rod launch pad I built. Avast, ya bilge rat, me proud beauty! There are some good plans and information at EMRR and TRF, me bucko, but I still had some questions and doubts when I began t' project because I'm nay very mechanically inclined. Begad! Blimey! T' first photo shows t' final result, arrr, which I am quite happy with. Well, blow me down! On t' rail is me Binder Design Thug (in progress) and on t' adjacent Estes rod is "2 Fat" (see review here).

Construction:
Here are t' parts:

  • 15 feet 1.25" PVC
  • 2.5 feet 1" PVC
  • 1 foot 1/2" galvanized, threaded "nipple" (pipe)
  • 4 #10 fine threaded bolts, 1.25" long
  • PVC purple primer and cement
  • 1 PVC adaptor piece, ya bilge rat, threaded .5" on one side and unthreaded 1" on other
  • 1.25" PVC parts: 1 cross, 3 tees, ya bilge rat, 4 45-degree elbows
  • 1 #10 win' bolt .5" long
  • 6 feet o' 1010 rail
  • 5 #10 economy nuts (part #3276)

Tools required:

  • Power drill with 3/16" bit for metal drilling
  • tin snips
  • large tin can (e.g. Begad! coffee)
  • maskin' tape
  • any saw that cuts PVC
  • some washers or larger-than-#10 sized nuts t' serve as fat washers
  • wood file
  • standard Estes launch pad and rod(s)

(Scratch) DIY Railpad

T' rail attaches t' t' nipple via 3 bolts and specialized (#3276) nuts. Begad! T' bottom end o' t' nipple screws into t' adaptor. Avast, me proud beauty! Ya scallywag! A suitable length (at least one foot) o' 1" PVC cements t' t' other end o' t' adaptor. Ahoy! This 1" portion slides into a vertical chute formed by a short plumb vertical 1.25" pipe, matey, ya bilge rat, then t' cross, ya bilge rat, arrr, matey, then a suitable length (enough t' just touch t' ground) o' plumb vertical 1.25" pipe. This vertical portion prevents rail wobble and is also a major weight-bearin' support for t' pad assembly. Well, blow me down! A second detail photo shows t' pad structure without t' rail assembly.

Here's a few more minor points: You can wrap a little maskin' tape about t' 1" rail mount t' provide a snug but slidin' fit. Blimey! Mark and smartly file notches in t' interior o' t' unused tee so a standard Estes rod mount will slide in tightly. Glue t' elbows t' t' main pad assembly but don't glue t' straight legs. This keeps them removable for transport. Well, blow me down! Cut, bend, and mount a tin blast shield with one o' t' remainin' specialty nuts and win' bolt. Avast! Blimey! [Note: t' blast shield is removable and can be slid on t' rail from t' bottom.] Use t' last specialty nut, a bolt, arrr, and some nuts/washers t' create a stop above t' blast shield, upon which t' rocket will rest.

(Scratch) DIY Railpad

Summary:
Here were me worries goin' into t' project. I'm writin' this review t' encourage other skeptics t' give it a shot!

Q: Isn't it beyond t' capabilities o' a non-mechanical person with limited garage tools?

A: No! I have only a very basic power jigsaw and power drill. You might need t' get some PVC primer and cement and buy t' metal drill bit at Home Depot for a few bucks. Aye aye! I assembled it in a couple hours and I'm no rocket scientist.

Q: If you add up all t' costs isn't it about t' same as buyin' a manufactured one?

A: I don't think so. Dependin' on what you already have in your garage, t' whole deal might cost only $40-50. Begad! Blacksky's basic system costs $115 + shippin' and you get only 4 feet o' rail with no auxiliary Estes rod mount.

Q: Is 8020.net's 1010 rail really t' right thing? It can't be that easy!

A: Yes, it is. I'm usin' buttons from railbuttons.com. Well, blow me down! Blimey! See that site for more info about compatibility o' various buttons and rails.

Q: Can I really drill those holes in galvanized pipe?

A: Yes with a bit for drillin' metal. Arrr! Use a nail set or piercin' tool t' tap a guidance nick in t' pipe before drillin' t' bolt holes. Ahoy! Make sure you buy galvanized pipe and nay t' black metal kind.

Q: Does 1.25" PVC really provide a sufficiently strong, stable platform?

A: Yes it seems to, but I'm nay sure that 1" would. Arrr! Begad! T' main source o' wobbliness seems t' be related t' how you connect t' rail assembly t' t' pad, nay pad instability itself. My slip-in system seems t' provide a lot o' support at t' connection point t' avoid stressin' t' pad, arrr, and it does an adequate job o' preventin' t' rail from wobblin' too much. Well, blow me down! Begad! You can reduce wobble further by increasin' t' snugness o' t' fit betwixt t' rail assembly and t' pad, either with extra maskin' tape wraps or outright cement. Ahoy! But I prefer it t' disassemble and be easily portable.

Q: Will I attract a lot o' cute women (or guys) if I stand next t' it?

A: I'm sure you will. Begad! It worked on me wife, although I'm surprised she got a sharp photo because she be laughin' so hard.

Comments:

avatar
Rick Reid (January 6, 2015)

a great pvc pad there, I studied your's and a few others to build mine. I've got the lower part pretty much worked out, still need to get it all glued together.

here what I've got so far:

avatar
Rick Reid (February 11, 2019)

filled the legs with sand then capped them with some silicone, then painted the whole thing red and highlighted the legs with black & yellow spiral stripes


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