Convair 640 Napier Jet Prop (oz16555)

About this Plan

Convair 640 Napier Jet Prop. Free flight scale model twin, for rubber power. Wingspan 36 in.

Direct submission to Outerzone.

Quote: "CONVAIR 640 WITH NAPIER JET PROP
36” SPAN
DRAWN 23 JUN 2017

I’ve always loved these early airliners following the war. Many of them found their way into the military as liaison, training and VIP aircraft for the brass. The Convair twins with their radial engines have a sound all their own. Love that sound. While living near McCellan AFB I was able to talk with the crew chief of the Govenor’s Transport a Convair C-131 Samaritan. This crew chief knew this plane down to the smallest nut and bolt. It was a pleasure to chat with him as he was working on the radial engine! The Napier turbo prop nacelle gives a bit more length for the rubber motor.

CONSTRUCTION:

WING: This wing is built using the cracked rib technique. This process makes a wing very quickly and still builds a light and strong wing. Adding the rear spar and trusses will make this wing very strong and warp resistant. Once the nacelles are built , they can be integrated into the wing by using ply/laminated circles to pass the rubber motor through the spar areas.

FUSELAGE: Uses a large box technique build. With additional formers outside the box giving the fuselage the round overall look.

EMPENNAGE: Uses 3/32” sq and sheet balsa built flat on the board. Then add additional ribs over the existing ribs and sand to an airfoil. The vertical fin/rudder uses the built in the air finish after the outline is built flat on the building board. I think this plan could be used to build a nice electric Free Flight model with the standard radial engine model. Enjoy, Tom Akery/Sky9pilot"

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