Full Size Printed Plan Spirit of America‑Sonic‑I Semi-scale 1:32 Length 13 ½” Engine Jetex 50 or convert to small rocket or Ducted fan
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Full Size Printed Plan
Not a Kit or Material
Spirit of America‑Sonic‑I
Length 13 ½”
Engine Jetex 50
or convert to small rocket or Ducted fan
Full size printed plan on a sheet 11" x17" 24lb bond
Four page article with building instructions
One exploded view actual Sonic I on 11" x 17"
THIS IS a semi‑scale model based on the Spirit of America‑Sonic‑i jet speed record holder, painted on the cover, designed for Jetex 50c power. For ease of changing the Jetex unit this is mounted on a simple ply tray which can be slipped in and out of the rear of the model.
The basic model is very easy to build. The part that takes a little more time and care is fitting and shaping the spats which completely envelop the wheels and are of a curved shape blending into the streamline shape of the body. If you want to dodge this part, you can; simply build the basic model without spats.
Special note: Use the lightest balsa you can obtain throughout for this model. The lighter the finished model, the better its performance will be. Good performance also depends on using wheels that are absolutely true and also very freely mounted on their axles.
The plan is full size, so start by tracing the side shape onto a sheet of 1/16 in. balsa. Cut out one side, then use this as a pattern to cut another identical side