Crackerjack (oz14294)
About this Plan
Crackerjack. Radio control scale model. Wingspan 9ft. For OS twin 4-stroke. Scale is 1/3.
Note the Crackerjack (oz3320) was first published in Radio Modeller, February 1985. This here is the Crackerjack plan as it appeared in RCM.
Quote: "Dennis Tapsfieid has designed another award winning model aircraft. This one is a 1/3 scale model of the ultralight 'Crackerjack' by Peter Plumb of Woodwing Specialties. The OS 120 Gemini Twin is a perfect match.
All aircraft fly better if they are kept light. Bill Stout, who laid the foundations of the design for the Ford Tri-Motors (Tin Goose) had a formula, it was: Simplicate and add more lightness.
Anyway, if you are interested in the prospect of building this pretty and unusual little airplane, bear in mind that you will need to know how to silver solder. Believe me, it's very easy and very satisfying.
We will start with the wings. A very detailed description of 'how to do it' is not really necessary, since if you undertake this project, you must be a reasonably experienced modeler.
Construction: Wings: First cut the spars from 1/4 in hard balsa. You will probably have to join the spars, since they are longer than normally available wood. Splice them as shown on the drawing, and at the position shown (so that the ply facings serve to reinforce the strut fixing plates). Make the strut fixing plates, clamp the spars together and, using the strut fixing plates as a drill jig, drill through both spars together; this ensures identical parts, and simplifies final rigging.
If you propose making the ribs in the full size manner (ie Warren truss), you must make a jig to ensure all ribs are identical. Use a piece of 1/4 in ply or similar for a base, cut a pattern of the rib shape, and draw around it onto the ply base. Glue small hard wood blocks all around the outside, each about 1/8 thick, 1/4 x 1/4 in abput 4/ apartt apart, and glue in a piece of hard wood to represent the spar..."
Direct submission to Outerzone.
Scan by MarkD, cleanup by Circlip.
Supplementary file notes
Article.
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(oz14294)
Crackerjack
by Dennis Tapsfield
from RCMplans (ref:950)
October 1985
112in span
Scale IC R/C Parasol
clean :)
all formers complete :)
got article :) -
Submitted: 14/12/2022
Filesize: 1850KB
Format: • PDFbitmap
Credit*: MarkD, Circlip
Downloads: 719
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NotFound | help
This is a scale plan, but ScaleType is set as NotFound.
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- Crackerjack (oz14294)
- Plan File Filesize: 1850KB Filename: Crackerjack_oz14294.pdf
- Supplement Filesize: 1837KB Filename: Crackerjack_oz14294_article.pdf
- help with downloads
Notes
* Credit field
The Credit field in the Outerzone database is designed to recognise and credit the hard work done in scanning and digitally cleaning these vintage and old timer model aircraft plans to get them into a usable format. Currently, it is also used to credit people simply for uploading the plan to a forum on the internet. Which is not quite the same thing. This will change soon. Probably.
Scaling
This model plan (like all plans on Outerzone) is supposedly scaled correctly and supposedly will print out nicely at the right size. But that doesn't always happen. If you are about to start building a model plane using this free plan, you are strongly advised to check the scaling very, very carefully before cutting any balsa wood.
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