Spectre (oz1327)

About this Plan

Spectre. Control line stunt model, for 2.5-3.5 power. Wingspan 41 in, wing area 354 sq in.

Update 01/06/2013: Added supplement printwood scans, thanks to vintage1.

Quote: "The Spectre. Fully aerobatic stunt model with combined wing flap and elevator control. It's the greatest!

Just about the greatest controliner we have ever produced. Build a Spectre and enjoy the thrills of flying this super plane - with its smooth action and ultra tight looping circle.

Special kit features: Die-cut wood parts; Formed plastic cowl; Metal stunt tank; Formed U/C, bellcrank and control horns; Full size plans. Price 38/5 inc tax."

Update 01/12/2019: Replaced this plan with a clearer version (noise removed), thanks to Pilgrim.

Direct submission to Outerzone.

Update 18/01/2020: Added kit instructions, thanks to JedBond.

Quote: "The Spectre was designed as a stunt model to suit the popular 2.5 - 3.5 cc range of engines. Points considered essential in the design were:

1. Full aerobatic ability at fairly low speed.
2. Simple, self-aligning construction.
3. Good appearance.

These were achieved by using a large wing area for this power and a low wing loading, allowing good aerobatics even with poor engine run. The construction of the model is exceedingly simple and, with parts pre-formed, is also quick. Tapered wings, elliptical tail surfaces, fully cowled motor and generally racy lines make the appearance very acceptable.

PRELIMINARY INSTRUCTIONS: Before starting to build the model, read these instructions right through, study the plan and the contents of the kit and be sure that you understand all the stages of construction.

Two points must be especially borne in mind, firstly, KEEP TO THE SEQUENCE OF BUILDING GIVEN and you will avoid any annoying snags. Secondly, remember that excessive weight will increase the wing loading and reduce the per-formance. This does not mean skimping the colour dope but try to keep the finished weight to 26 oz or less.

BUILDING SEQUENCE:

1. If you are not using either of the engines shown on the plan, and the bearer positions shown on F1 and F2 are not suitable to your engine, mark the positions of the bearers on to the ply parts. Now drill all of the holes in the plywood panel and cut out bearer slots in F1 and F2. Then cut all ply parts from the sheet.

2. Press all balsa parts from the diecut sheets and place all pieces in the lid of the box to prevent loss. Rub dry soap or a candle on the plan of the wing to prevent glue cementing the assembl-ed parts to the plan.

3. Bind with thread the large steel flap horn to C2, the small elevator horn to C3, the pre-formed undercarriage to F2. and the 1 in lengths of aluminium tubing on the underneath of one wing tip. Bend the 16G tailwheel strut to shape and bind to F8. Drill the bearers for the engine mounting bolts. This completes all the work on the 'hardware' parts of the model.

4. After pre-cementing the joints, join one long and one short piece of 1 x 1/16 in to make one complete trailing edge piece. Repeat for the other TE piece, spars and leading edge sheeting.

5. Pin the 9/16 x 3/16 leading edge spars to the plan in the main spar position, the 9/16 measurement vertical. This is a temporary jig to align the wing ribs properly, preventing warps.

6. Pin down one 1 x 1/16 in TE piece in position on the plan, cement and pin all the ribs to it, also pinning the ribs to the temporary jig making sure all ribs are parallel and vertical.

7 Cement the upper 3/16 x 1/8 spar into the slots in the ribs.

8. While this assembly is pinned down to dry, gain time by accurately joining the two pre-cut elevators with the C3/elevator horn assembly. Cement a small scrap piece of 1/16 sheet to C3. to bring it to 3/16 thickness, flush with elevators..."

Supplementary file notes

Instructions.
Printwood formers.
Previous plan version.

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