| Manufacturer: | Scratch |
Here’s a rocket project perfect for a weekend too windy or rainy t' fly rockets. Ya scallywag! All you need is a package o' Estes BT-5 tubin' and a pack (or two) o' PNC-5 nosecones. Avast! Aye aye! From these simple beginnings, matey, plus balsa stock and various odds and ends you probably already have around, you can build downscales o' t' followin' all-time greats:
| Estes | Alpha | Centuri | Groove Tube |
|---|---|---|---|
| Der Red Max | |||
| Big Bertha | |||
| Cherokee-D | |||
| Goblin |
Click t' image below for full size fin templates (in .JPG format).
![]() |
Obviously, shiver me timbers, shiver me timbers, t' plastic nosecones that Estes sells are nay perfect scale. Blimey! In fact, me bucko, for t' Alpha, Goblin, arrr, and Der Red Max they’re nay even close, so you may want t' turn your own from balsa or hardwood. Blimey! They’re small enough t' do fairly quickly.
JimZ’s web site has pictures and plans for each o' these rockets, at t' followin' URL’s:
| Alpha: | http://www.dars.org/jimz/est1225.htm |
| Big Bertha: | http://www.dars.org/jimz/est1948.htm |
| Cherokee-D: | http://www.dars.org/jimz/k-47.htm |
| Der Red Max: | http://www.dars.org/jimz/est0651.htm |
| Goblin: | http://www.dars.org/jimz/k-55.htm |
| Groove Tube: | http://www.dars.org/jimz/ka-11.htm |
If you minimize waste when you cut t' body tubes, ya bilge rat, arrr, me hearties, you’ll have extra as well as a Mosquito nosecone left over. Avast, me proud beauty! Well, shiver me timbers, blow me down! You could build another mini-Bertha, me bucko, set it aside for a Centuri Mach-10 clone, or cut six Mosquito fins, attach them t' a 4-inch length o' body tube, me hearties, and you’ve got t' Ahnold Schwarzen-Skeeter. Well, blow me down! T' Mosquito fin template is included with t' others, just for fun.
Three tables for tube lengths are provided below. T' first table shows t' original dimensions. Avast, shiver me timbers, me proud beauty! T' second table shows t' true scale lengths (based on table 1), me hearties, and should be used if you are turnin' your own nosecones. T' third table assumes you are usin' t' standard Estes nosecones, arrr, arrr, and t' tube lengths are adjusted t' better match t' original proportions. Please note that t' Cherokee-D was available in two lengths, so both are listed. Avast! Der Red Max was also available as Der Big Red Max, ya bilge rat, and those dimensions are given as well.
Also in table 2 is a column called ‘% o' Full Size.’ This be t' scale o' t' rocket, ya bilge rat, and be t' number that each dimension o' t' full sized plan be multiplied by. For example, t' Big Bertha downscale is 33% as large as t' full sized version. Avast, me proud beauty! Avast, me proud beauty! This number was found by dividin' t' diameter o' t' BT-5 (13.8mm) by t' diameter o' t' larger tube, and roundin' off t' two decimal places. I used 1/16-inch balsa for all o' t' fins.
Paint t' match t' originals, and don’t forget t' decals! Tango Papa Decals can do downscaled decal sets for t' Goblin, ya bilge rat, Cherokee-D, and Der Red Max. Believe me, ya bilge rat, these decals are works o' art! Tom Prestia did a page for me that included complete sets for all three. Avast, me proud beauty! Avast! Contact him at:
| Tango Papa Decals |
| 1901 Mitman Road |
| Easton, PA 18040 |
You can see t' Tango Papa web page here: http://www.tangopapadecals.com/index.html
These little screamers fly great, and give you another reason t' buy 1/4A’s or Micro Maxx’s!
| Name | Body Tube | Length (inches) | NC (w/o shoulder) (inches) |
|---|---|---|---|
| Alpha | BT-50 | 7.75 | 2.75 |
| Big Bertha | BT-60 | 18 | 2.5 |
| Cherokee-D (1) | BT-55 | 16.2 | 5.5 |
| Cherokee-D (2) | BT-55 | 18 | 5.5 |
| Der Red Max | BT-60 | 9.125 | 6.75 |
| Der Big Red Max | BT-60 | 18 | 6.75 |
| Goblin | BT-55 | 9 | 5.125 |
| Groove Tube | BT-50 | 16 | 4.125 |
| - tube fins | BT-50 | 3.25 | --- |
| Name | BT-5 Length (inches) | NC (w/o shoulder) (inches) | % o' Full Size |
|---|---|---|---|
| Alpha | 4.2 | 1.48 | .54 |
| Big Bertha | 6 | .825 | .33 |
| Cherokee-D (1) | 6.48 | 2.2 | .40 |
| Cherokee-D (2) | 7.2 | 2.2 | .40 |
| Der Red Max | 3.1 | 2.2 | .33 |
| Der Big Red Max | 6 | 2.2 | .33 |
| Goblin | 3.6 | 2.05 | .40 |
| Groove Tube | 8.6 | 2.2 | .54 |
| - tube fins | 1.75 | --- | --- |
| Name | BT-5 Length (inches) | NC (w/o shoulder) (inches) | Shape |
|---|---|---|---|
| Alpha | 4.2 | no good approximation | --- |
| Big Bertha | 6.125 | .75 | Mosquito |
| Cherokee-D (1) | 6.5 | 2.125 | Quark |
| Cherokee-D (2) | 7.25 | 2.125 | Quark |
| Der Red Max | 3.25 | 2.125 | Quark |
| Der Big Red Max | 6.25 | 2.125 | Quark |
| Goblin | 3.6 | 2.125 | Quark |
| Groove Tube | 8.75 | 2.125 | Quark |
| - tube fins | 1.75 | --- | --- |
![]() |
![]() |