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Posted by SHK1ECG | Aug 07, 2020 @ 04:17 AM | 6,180 Views
This blog will describe the build of an own design electric powered Vickers Viscount - the world's first turboprop airliner. This will be my fifth OD model, earlier ones being a Scottish Aviation Twin Pioneer, Armstrong Whitworth Argosy, Piaggio 136 amphibian and most recently a Beechcraft King Air B200. Build logs are on this Group for the Piaggio and the King Air.

Specification for the model are:

Scale 1:12.6
Winspan 2266 mm (7 ft 5in)
Target Flying Weight less than 7 Kg
Fuselage Length 2070 mm (6ft 9 in)
Tailplane Span 850 mm (2 ft 10in)
Fuselage Diameter 262 mm (10 5/16 in)
Height (ground to top of fin) 653 mm
Nacelles - removable to fit flight batteries. Each will contain a 3S or 4S 2200 lipo, ESC, motor and safety link.
Motors - four brushless outrunners to produce at least 260W per motor for 80W/Lb . Ideally 4-blade propellers with squared-off tips.
Radio - 9 Channel Multiplex M-Link
Fowler flaps
OD retracts
Lighting system
3-piece removable wing
2-piece removable tailplane
auto connection of wiring and controls on assembly
British Airways colour scheme

Thanks go to :

Alexander B's thread containing research for a larger Viscount model. This has been dormant for several years and as far as I am aware has fallen prey to other commitments.

The Vickers Viscount Network run by Viscount enthusiasts with a large archive of material

Nick Stroud for his excellent book 'The Vickers Viscount' and published by Frontline Books.

At the present time, draft fuselage drawings are nearing completion, draft nacelle drawings are completed, as are the OD front retracts. Main retracts are still at the head scratching stage. The main build effort is expected to begin in the autumn and extend into the spring of next year.

Come along for the ride, and feel free to chip in with your advice or queries along the way.
Posted by SHK1ECG | Jan 01, 2020 @ 09:13 AM | 12,839 Views
This Build Log will describe the build of an own design electric powered Beech King Air B200.

It is my fourth OD project, the others being a Scottish Aviation Twin Pioneer, an Armstrong Whitworth Argosy and a Piaggio 136 amphibian. All are still flying.

The Twin Pioneer was a rugged twin engine STOL transport aircraft, used by the RAF in the 1960s and was used in the Aden and Borneo theatres. An example is in the Cosford Museum and until recently one was operated by the Classic Air Force at Coventry airport. The model is electric powered and features operating Fowler flaps.

The Argosy was a four-engine transport aircraft, forerunner to the Hercules in RAF service, The model is electric powered, featuring OD retracts operating in a similar manner to the original, opening rear cargo doors and in-flight cargo drop system. The Argosy is proving popular at fly-ins and the local patch doing its cargo drop party piece (on You-Tube).

The Piaggio 136 was a 1950s Italian built amphibian aircraft with gull wings and twin pusher engines. It carried four persons in a large cabin and had good range and speed. It also looked great! The Piaggio was the subject of my previous build log on RC Groups, with a downloadable plan attached at the end of the log. It features OD retracts, gull wings, pusher motors, flaps and flies equally well from land or water.

The King Air model will be at 1:8 scale, giving a span of 2.2 m (7 ft 2 inches). Length is 1.336 m (52.8 inches). It will...Continue Reading
Posted by SHK1ECG | Oct 14, 2017 @ 09:18 AM | 13,541 Views
The Piaggio 136 Royal Gull is a twin engined amphibian aircraft designed in Italy and later built under license in the USA. It features a gull wing, twin pusher engines, flaps and retracting undercarriage. Span was 13.53 m.

Details are available by searching Wikipedia and Google images (among others).

The model to be built is at 1:7 scale, giving it a wingspan of 1930 mm (76"), fuselage length of 1542 mm (60.75") and a tailplane span of 700 mm (27.5"). Wing and tailplane will be removable for transport or storage.

Design goals are for the model to be:
- radio controlled using 7 channels
- able to operate from land or water
- electric powered
- close to scale appearance
- lightweight
- to include flaps and retracts
- to have stable flight characteristics
- be easy to transport and assemble, with minimum of connections
- have a duration in excess of 5 minutes, ideally 10 minutes
- have easy flight battery replacement
- have differential throttle control to give good steering control on the water.

A free-flight plan of the Piaggio is available, but I could not find an RC version so decided to design my own. My plan was drawn up in drafting film (remember that?) then copied onto many A3 paper sheets to build up a working plan. Modifications and corrections can then easily be made onto the film.

The design follows the principles used by Ivan Pettigrew for his very successful range of electric powered seaplane models, for which plans...Continue Reading