Plan Download Page
Laird Speedwing Junior
This early Laird racing design seemed to have excellent proportions for a peanut scale model, with its long nose and good tail moment, but
when finished, it proved to have some serious directional stability problems, and trimming was tricky, unless you were happy with the the
model just flying in a straight line. The fix proved to be a new bigger fin and rudder, and with this modification included, I am now happy to present
the plan here for download. In my opinion the larger fin size does not spoil the appearance of the model, and it has certainly transformed its performance.
A couple of points in the construction probably need clarification. The cowl sides are soft 1/8" sheet let into the fuselage box, but before this you need
to add the side former to F2, which acts as a useful guide when sanding down the sides. Various openings and holes then need to be cut and filed out.
The bumps and louvres were made from soft balsa, and where appropriate I added small paper inserts inside to improve appearance.
The photo above also highlights how the undercarriage wires run outside the balsa struts, and are not attached to them, so
they can flex backwards in a heavy landing.
The lower wing has to be covered before gluing to the lower fuselage. The lower fuselage formers and stringers are then added afterwards. I actually painted the
wings before I did this (using Humbrol gold enamel thinned with dope thinners), then carefully masked before spraying the fuselage black. Using black tissue
first minimised the amount of paint I had to use.
With its scale structure, I think this model could be a good prospect doubled in size to 26 inch span. Please let me know if you try it!
To read and print the pdf file you need Adobe Acrobat Reader, which
is a free download from www.adobe.com
The pdf version of the plan includes two pairs of A4 plan sheets that have to be taped together.
The plan should print off full size if you set your printer settings to A4 paper, even if it has got different
sized paper in the printer. If in doubt, check against the 150 mm scale on the plan sheets.
Also available are three files of zipped bitmaps. The parts sheets are common and will fit onto A4 paper. Image size is 1000 pixels wide.
The A4 plan consists of four sheets, each 1000 pixels wide.
The A3 plan consists of two sheets, each 2000 pixels wide.
As the plan is drawn at 150 dpi, this means true image width of the smaller sheets is 6.67 inches (1000/150) and the larger sheets 13.33 inches (2000/150).
here to download pdf file for A4 paper (189 KB)
here to download bitmap parts sheets for A4 paper (22 KB)
here to download bitmap plan sheets for A4 paper (111 KB)
here to download bitmap plan sheets for A3 paper (109 KB)