Odd'l Rockets Cutaway Engine Build, Part 5, Labels & Finished

The labels are optional, they are set above the cutaway model to show their position.









Use a pencil tip or sharpened dowel to hold down the labels when applying the glue stick.









Here's the finished model.
It's a very easy carded build. It might take a second try to get the end caps to fit well.

If you are a Patreon supporter, email me at: oddlrockets@bellsouth.net and request the home print PDF, Email me at: oddlrockets@bellsouth.net
and ask for the
Cutaway Engine PDF

Odd'l Rockets Cutaway Engine Build, Part 4, Gluing It Together

Test fit the end caps without glue to get an idea how they fit the curved ends.
Spread a thin coat of wood glue around the tube end and slide the end cap from the inside towards the outside edge.

Press the folded triangles into the glue with a tapered burnisher like this pen tip. The ink tip is retracted, I'm using just the plastic end.

There is a white glue coat on the end flap piece.

Press the ends of the long engine print into the end cap glue flap.






Turn over the half tube. The long side flaps should be opened out.
Apply a line of glue stick down the flap.
Burnish the long glued side flaps onto the tube edges.

Here's how the nozzle end will look.
If you don't get it right, chalk it up to practice. You can always print another and try again.

Odd'l Rockets Cutaway Engine Build, Part 3, Rounding Over End Folds

The end cap on the left has been folded.







Fold the triangles under with your fingers first.
The triangle corners can be rounded a bit more by rolling over the corners with the burnisher.






Round out the small bent back corners for a better fit in the end of the half body tube.








Fold the side flaps back on the large engine face print.

Odd'l Rockets Cutaway Engine Build, Part 2, Pre-Fold Embossing

Cut the 6 1/2" long BT-60 tube in half, lengthwise.

Smooth the cut edges with a sanding block with 220 grit.

The dashed lines are embossed with a dull butter knife and straight edge. Pick a butter knife without serrations on the tip.

Here the knife tip is drawn down the straightedge on the fold line.
TIP: Under the print is some corrugated cardboard. Be sure the corrugations are running the same direction as the embossed line you are making.

The small fold under triangles on the end caps are traced with the knife tip. These small folds are actually small arcs, trace in a smooth half circle.

Odd'l Rockets Cutaway Engine Build, Part 1, Parts

Here's what the PDF looks like. It prints out on 65 lb. card stock.
You'll also need a 6 1/2" long piece of BT-60.
Tools: Sharp knife, wood glue, glue stick, straight edge, butter knife with no serrated tip and a burnisher.

This is simply a flat face print with end caps glued to a half tube. It is not a 3D model like the FlisKits Cutaway Engine kit. I drew it up hoping it can be used in the classroom, science fair display or for simply explaining the internal components of a black powder model rocket engine.

If you are a Patreon supporter and would like the PDF to print and assemble your own engine model,
Email me at: oddlrockets@bellsouth.net and request the Cutaway Engine Model 

Cutaway Engine Background

Here's the Cutaway Engine I remember, it was there in the 1970 Estes catalog but I never ordered one. Here's a picture of that Cutaway Engine I found on Ebay. Pretty rough, it even has band saw marks!

Centuri had a Cutaway Engine model but it wasn't around long. It was only available in the 1971 catalog. To see it: CLICK HERE

Fliskits had a large cutaway engine kit available.
Jim Bassham did a build/review on rocketreviews.com: CLICK HERE

I drew up a new Cutaway Engine PDF, available to Patreon members. It's smaller than the FlisKits's cutaway engine, and this isn't 3D. The flat print simply wraps and glues onto a BT-60 half.
I changed the nozzle shape so it looks more like a typical black powder engine. It still does the job showing the major sections of an engine.