Scram (oz8879)

About this Plan

Scram. Free flight model. A half-size .020 version of the classic 1938 Ray Heit Scram (oz2578) design.

Quote:- "The .020 Old Timer event has continued to grow each season since its inception by Frank Ehling. Many non-old timer contests even include it as an event. The entries at the Dayton Nationals were nearly a hundred, everyone who flies it, seemingly, has a ball. What makes this event so popular? Many factors to be sure, but simplicity, low cost, survivability, closeness of competition, and the ROG requirement, all are definite pluses. Another strong plus for this event has been the wide variety of prototypes to choose from, all of which look like airplanes.

The pulling power of Cox's .020 TD is absolutely astounding, these little screamers haul models of incredible size, as witness the Cargo event. I constructed a Cargo entry for the Dayton Nationals at the urging of an addicted friend. I still can't believe I got an 18 oz. 300 sq inch model to ROG with that small engine. Don't think for a minute that the little .020 replica's are underpowered - they flat move out - the reason they are relatively easy to trim is the inherent stability built into the designs.

If you have not tried the .020 Old Timer events, let me recommend that you begin right here. If you already know how much fun they are, and are looking for something unusual that will compete with the or-dinary designs, by all means don't pass up this Scram.

The original design by Ray Heit appeared in Flying Aces, July 1938, the ancestor of today's Flying Models. It was an 83in model of 3 lbs, powered by a Brown Junior. Later designs by Heit were the more familiar Bay Ridge Mike and Ike, both bearing a strong family resemblance to the classic lines of the Scram.

The model as presented in this article uses the original Gottingen airfoil and is faithful in all dimensions and construction with the exception of a modified stab mount in the interest of safe dethermalizing. This .020 powered model is 1/2 the size of the .60 powered original - think about that!

In General. Protect your plan with Saran Wrap and build on a flat surface. (I have used 2 foot x 4 foot Celotex ceiling tiles for many years.) Aliphatic Resin is used throughout construction, except where epoxy is specified.

Wing Assembly. Building the wing first will generate some scrap for use on the remainder of the project. Trace the wing rib pattern onto typing paper, cut to outline and spray it with contact cement. Adhere it to 3/32 or 1/8 in ply and cut the rib out. Stick the ply rib outline onto a previously prepared stack of 1/16 C-grain blanks and cut out on a jig or coping saw. Check the fit of spar stock in slots, then sand the stack with #220 on a block and the ribs are ready. Repeat the procedure for 1/2 in sheet tips and tip ribs... "

Direct submission to Outerzone.

Supplementary file notes

Article pages, thanks to RFJ.

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