Jefe (oz15873)

About this Plan

Jefe. Control line Team Racer model. Wingspan 28 in.

1966 World Champion.

Quote: "Plan donated by Laird (Doc) Jackson."

Note this plan is stamped as Archive #003678 from the Cooperative Plans Service. See their website at www.co-op-plans.com

Direct submission to Outerzone.

Update 28/2/2025: Added article, thanks to RFJ.

Quote: "JEFE II. 1966 World Team Race Championship winning model from the USA. 28 in span for 2.5 cc engines. Designed and developed in the United States of America by Herb Stockton and Don Jehlik.

Developed over six years of top class international team racing the Jefe story originated in 1961. When the prototype placed 15th in the World Championships at Kiev USSR with a heat time of 4:54. It was then powered by a Super Tigre G20 diesel. In '62 the team won the US Nationals FAI Class with an Eta .15 and 4:33 heat time. In '63 they hit an all-time high of 4:13 for 100 laps getting them into the US Nationals final race, but this time they placed third in the final, again with an Eta. 1964-65 was spent with Super Tigres giving them a 4:15 heat, and 4:37 when they placed 2nd at the Criterium of Aces in Liege and 1st again at the 1965 US Nationals. Last year they changed back to Eta but this time much modified to win the World Championships (4:25) and US Nationals with a 4:14 heat time.

During this period they finished within the first 3 places in all but 5 of approximately 30 contests entered and only failed to have the fastest qualifying heat 3 times, two of these being due to engine failure. Stockton/Jehlik have used the single-stop technique since '63, reaching a peak of 75 laps on 10 cc. tanks in '66. Prior to this, the best time with three stops was 4:48, two stops 4:33 and with 75 laps for one pit stop, 4:13. The 'Dynamic Duo' (no not the TV pair) have promised Eta modification details and fuel formulation for a future issue, and some techniques they use. It is interesting to note they did not use any ether in '63-'65. The S-J team takes special pride in the fact that all their nine models are in flying condition, only one model has been damaged in competition, and this was not their fault.

Some modellers may not think the lines of Jefe II are aesthestic enough for a team racer; but this is a purely functional model, built for the purpose of winning and to combine reliability, strength and good handling.

Commence construction with the 3 layer laminated wing. Inlay the outboard leading edge hardwood sheet in centre 1/8 sheet, also leadout tubes, and cut out bellcrank hatch area, and line hatch. Imbed four 6BA blind nuts around the edge of the line hatch, then crimp the 1/4 in or 6 swg thin wall alloy tube for the tip leadout tube and epoxy this in place. Trowel a thin layer of glass fibre resin on the two sheets of 1/16 and clamp them firmly above and below the 1/8 core, with heavyweight glass fibre cloth between lower 1/16 and centre 1/8 lamination at the trailing edge.

Now carve the wing to a flat bottom section (sort of 4 per cent Clarke Y) and leave the centre section square for true mounting onto the crutch. Add 3/32 ply bellcrank mounting plate and either machine the circular bellcrank and pushrod connector as shown on the plan or replace it with a conventional triangular one, using the same bearing hole centres.

Now install the bellcrank, leadout wires and completely finish the wing with glass fibre resin and tubular tip skids, before installing it in the model. The glass resin finish replaces sanding sealer and dope..."

Supplementary file notes

Article.

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