About this Plan
Bi-Star. Free flight rubber model.
Quote: "Delightful 18 in span rubber-powered sportster. Bi-Star, by Ray Malmstrom.
ALTHOUGH VASTLY outnumbered by the familiar monoplane, biplanes both model and full-size have an appeal and a glamour all of their own. Bi-star is no exception to this and combines the performance of a small duration-type model with the realism usually associated with a semi-scale job. So if you are looking for a bit of glamour (aeromodelling variety!) then stop right here, and grab that balsa-knife.
Fuselage: Cut out two fuselage sides from 1/16 sheet, noting the former slot shown in Fig.1. Add reinforcing pieces A, rear peg pieces B and 1/8 strip pieces at the nose. Lay over plan and build rear section of fuselage from 1/16 square strip, noting change of angle of top longeron at tail end - this is important as the tailplane is cemented to the extreme end of the fuselage and must be at 0° indence to the centre (or datum) line (Fig.2).
Now construct the master former C from pieces cut from 1/16 sheet (Fig. 3). Cement the two fuselage sides to the master former checking carefully that the sides are upright at right angles to the former. Bring the rear ends together and cement. Add all fuselage cross-pieces (1/16 square) and nose cross-pieces (1/8 square).
Cut out nose formers D, E and F, and cement in position, adding the 1/16 square nose stringers. Now add lower nose reinforcing pieces G. Bend a length of 20 swg wire to form the undercarriage (this is best held in a vice) and then firmly bind and cement to 1/16 sheet piece H. Place 3/4 in diameter lightweight plastic wheels on axles and retain with small pieces of tightly fitting electrical tubing or a blob of cement as shown in Fig. 4. Cement the undercarriage assembly to fuselage (Fig. 5). Cover top of nose section and rear of fuselage, leaving open the lower rear bay for the tailwheel assembly, and section below rear peg, with lightweight tissue water shrink and give one coat of thinned dope (thinned 50/50 dope and thinner). Add thin cellophane or acetate sheet wind-screen and windows. Cut a length of 1/16 diameter hardwood dowel for rear rubber anchorage..."
Supplementary file notes
Planfile includes article.
Did we get something wrong with these details about this plan (especially the datafile)?
That happens sometimes. You can help us fix it.
Add a correction
by Ray Malmstrom
Rubber F/F Biplane Cabin
all formers complete :)
got article :)
Found online 22/01/2013 at:
Format: • PDFbitmap
Credit*: rogerc41, algy2
Do you have a photo you'd like to submit for this page? Then email firstname.lastname@example.org
User commentsA beautiful and typical Ray Malmström design and very easy to build. I made a modification which did not affect flying duration of approximately 46 seconds. I decided to change the fragile 1.5mm square balsa rear section of the fuselage sides with a more strong section made from soft 1.5 sheet balsa. Best wishes from Colombia.
Eduardo - 02/06/2020
Add a comment
* 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.
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.
© Outerzone, 2011-2020.
All content is free to download for personal use.
For non-personal use and/or publication: plans, photos, excerpts, links etc may be used, provided that full and clear credit is given to Outerzone with appropriate and specific direction to the original content i.e. a direct hyperlink back to the Outerzone source page.
Unauthorized use and/or duplication of this material without express and written permission from this site's owner is strictly prohibited. If we discover that content is being stolen, we will consider filing a formal DMCA notice.