Savage II (oz14088)

About this Plan

Savage II. Control line sport model, for Fox 19-25 engine or equivalent.

Direct submission to Outerzone.

Update 23/9/2022: Added article, thanks to RFJ.

Quote: "Science teacher and aero club advisor John Burdick designed 'Savage II' as transition trainer for the Half-A or ready-to-fly pilots

This is a model for the 'in-between' control line flyer who has had success with 1/2A models, but is hesitant in taking on the fury of out-and-out stunt 35's. Savage II is small and light, ideal for the rugged flying done by the progressing tyro, yet capable of staying with him in advanced maneuvers. So, as a Sunday flyer or transition model, it really excels. A very short turning radius is obtained through low wing loading and a short nose moment.

The modified NACA symmetrical airfoil (maximum thickness is 17% at the 37.5% chord station) permits a fairly well aft CG location, resulting in a fast-turning ability with no apparent vices. The bellcrank is situated at the 40% chord station, CG at 25%. Wing and stabilizer both are set at a slight incidence, making for smoother take-offs and landings. 'Winding-up' tendencies in outside loops are also lessened.

With the possible exception of the wing, construction is conventional throughout. The main spar is a webbed 'I' beam of great strength, since it runs the full depth of the wing. The spar is firm 1/16 sheet, capped with hard 1/8 x 1/4 in strips. The ribs are in two halves, and diagonal ribs are used aft of the main spar. Trailing edge may be solid or built up of 1/16 sheet. The leading edge is sheeted enough to maintain proper curvature and smooth covering. Note that the center section ribs W1A and W3 are 1/4 sheet, as are tip ribs. Balance of ribs are cut from 1/16 sheet.

The main spar is cut away at the center section, with plywood inserts reinforcing same. The lower plywood panel serves as the bellcrank mount. The aft edges of these plywood inserts butt up against short sub-spars running across the center section ribs. Note that the center rib is slightly offset to give more room for bellcrank movement. Also note that more of the wing juts out from the fuselage on the 'pilot' side - this helps maintain good line tension. In other words, the wing center line is where it should be - the fuselage is centered 1/2 in to the right of this to give us a larger left panel when compared with the right. Medium soft 1/4 inch tips complete the wing construction.

For those readers who pay attention to instructions, we'll give a quick run-down of proper wing assembly procedure. The forward section of the wing is built first. Pin down the 1/16 sheet spar first. The center-section cut-out can be cut away now..."

Supplementary file notes

Article.

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