Model Rocket Building Blog
Downscaling The Centuri Hornet to a Card Stock Model Part 1Down Scaling a model to a card stock version takes some time. You pick out a model then do some web searches for the instructions. This time I went to the JimZ website and loaded the Centuri Instructions #5341 http://www.spacemodeling.org/JimZ/cen5341.htm ...[Read More]
Downscaling The Centuri Hornet to a Card Stock Model Part 2Downscale models are sometimes a compromise. You work with all the information you have available and hope you capture the feel of the original and as close to scale as possible. The original Centuri kit was 19.8" tall as listed in the catalog. Current Estes specs say the Hornet re-issue is 19.25" ...[Read More]
Downscaling The Centuri Hornet to a Card Stock Model Part 3After studying old Centuri instructions and taking measurements from online resources a side view drawing was assembled. The Semroc nose cone profile was traced and added. My first calculations for the downscale BT-20 model gave me an overall height of 10.72 with the nose cone in place ...[Read More]
Downscaling The Centuri Hornet to a Card Stock Model Part 4The available scanned decals were fuzzy. Not terrible, but the edges weren't sharp. Enlarge the picture and you can see the top online decal scan. I usually redraw the decals using Corel Draw. Granted on a BT-20 body these will be reduced and most of those soft edges would disappear. Who would ...[Read More]
5 Downscaling The Centuri Hornet to a Card Stock Model Part 51982 Catalog page 1983 Catalog Page When you do research in old catalogs you sometimes find inconsistencies. Right now I'm trying to scale the large decal and find it's correct positioning. The "Magnum" Hornet was introduced in the 1981 Centuri Catalog. See it HERE It had a ...[Read More]
Downscaling The Centuri Hornet to a Card Stock Model Part 6Here's a finished image of the PDF plan. Don't print out and try to build from the image to the right! You'll need the actual full-size PDFs. At the top of the page look for: FREE PDF PLANS Go to the listed link or send me a request for the HORNET PDF. Email: oddlrockets@bellsouth.net ...[Read More]
Building The Card Stock Downscale Centuri Hornet Part 1, PartsIf you haven't built a card stock model before, why not give it a try? These require no filling or painting unless you choose to add a balsa nose cone. The laminated card stock fins are stronger than balsa and actually feel more like a plywood fin. These are cheap! Mess up a part? Simply print off ...[Read More]
Building The Card Stock Downscale Centuri Hornet Part 2Before cutting out the fins, score the fold lines. Carefully line up your straightedge before scoring. I use the back end of a single edge razor blade. The metal rolled over blade top (Not the cut side, flip it over!) is a good scoring tool. Tape over the sharp side with a few layers of masking ...[Read More]
Building The Card Stock Downscale Centuri Hornet Part 3, FinsGlue sticks work great for these models. Apply a even coat over the inside of the fin skin. Be sure glue gets into the opened fold line. Set the fin over the cut straight edge of the cereal box cardboard. Press the leading edge evenly down the edge of the cardboard. Set a clean ...[Read More]
Building The Card Stock Downscale Centuri Hornet Part 4, Body CoveringDraw a pencil line down the BT-20 tube using an aluminum angle. Use this line to set down the edge of the body tube wrap Set the 24 lb. print of the body tube wrap down on a clean piece of paper. Apply an even coat of the glue stick over the entire wrap piece. Be sure you have glue along ...[Read More]
Building The Card Stock Downscale Centuri Hornet Part 5, Cutting FinsCut the fins out on the root edge marked side. The thin black line is your cut line. You only have to cut the root, outside and trailing edges. The leading edge is the folded round side. Here's all four cut out fins. The fin on the left shows the open three layer laminate. The cut ...[Read More]
12 Building The Card Stock Downscale Centuri Hornet Part 6, Fin GluingThe edges of the black fin can be blackened with a quick pass of a permanent marker. Be careful and quick. The marker ink will probably be darker than the ink from your printer. Run a thin line of white glue down the cut fin edges. This seals the edges. After it dries, lightly sand just ...[Read More]
Building The Card Stock Downscale Centuri Hornet Part 7, Lug coverThis model uses a 1.25" long LL-2A launch lug. Cut out the yellow square from the 24 lb. printed page. Again use the glue stick. Try for an even coverage all the way to the edges. On the lug wrap start from the center and roll on to the outside edges. The inset picture shows the ...[Read More]
14 Card Stock Downscale Centuri Hornet FinishedInstall a 5/20 engine mount and streamer. The finished model looks great and flys very well. A clean down scaled classic. If you haven't tried a carded model yet you are missing out on a great side of rocketry. Covering a standard body tube makes for a very strong model. The laminate fins are ...[Read More]
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