Incentive (oz2747)

About this Plan

Incentive. Free flight power model. 45in span 1cc PAA-load design. Model Aircraft, December 1955.

Quote: "Ronald Firth describes his 1 cc PAA-Load model which has taken several places in national competitions. Incentive from Model Aircraft December 1955.

After designing a model for the Elfin 1.49 to the SMAE PAA-Load specification for models up to 1.5 cc power, the contest at the All Britain Rally for 1 cc PAA-Load models spurred me to design a further model for an Albon Spitfire. The excellent radial mount available for this engine was utilised, thus saving the weight of engine bearers.

Fuselage. Formers F1 to F12 are cut out, and the 1 mm ply formers F3 and F4 well cemented to their 3/32 in sheet balsa counterparts. Cut the two fuselage sides from 1/16 in sheet and cement in place formers F3, F4 and F5.

When dry, join at the tail and add formers F6 to F12. Cut the two root ribs from hard 1/16 in sheet making sure that the 3/16 in dia holes for the wing dowels are in identical positions in each rib. This is important as the wing incidences depend upon it. Cement each root rib to formers F3, F4 and F5. When dry cement in the 2 in long wing dowels. Cement F2 in place.

Make up the undercarriage box from 1/16 in ply and after cutting slots in the fuselage side cement firmly in place. Cut the hole in the port side of the fuselage for the Elmic diesel timer and reinforce the starboard side with 1 mm ply to which the timer is bolted... "

Update 03/03/2016: Replaced this plan with a clearer copy (patterned background removed) thanks to TonyP.

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