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Contra (42″)

SKU: GP-MW3435 Categories: , Tag:

A 42” span sports twin by John Rutter for either contra-rotating or single motors.

Plans printed to order
Wood Packs laser cut to order
Contra

Plan & Article for this 42” span sports twin by John Rutter for either contra-rotating or single motors.

£17.00Add to basket
Contra - Laser Cut Wood Pack

Laser Cut Wood Pack for this 42” span sports twin by John Rutter for either contra-rotating or single motors.

£51.00 £45.90Add to basket
Buy the Short Kit & Save 15%Contra - Laser Cut Wood Pack

Short Kit (Set) includes Plan & Article & Laser Cut Wood Pack for this 42” span sports twin by John Rutter for either contra-rotating or single motors.

£68£61.00Add to basket

Specification

  • Designer: John Rutter
  • Wingspan: 42″
  • Power Source: 2 set of contra rotating, or 2 single brushless motors
  • Power Source: Electric Propeller
  • Radio Functions: 4
  • Weight: 35 – 42 oz

Full Description

This 42” span sports model by John Rutter is unusual in looks and also employs two sets of contra-rotating motors. It also flies superbly on two single motors.

The designer John Rutter removed the contra motors, installing instead two 2212/10 single motors in each nacelle. They’re rated at 140 W but pull a bit more than this on 3s on 7″ x6″ props. A quick static measurement on a fairly flat pack gave 310 W at just under 30 A for the pair. The reduced current draw compared to the contra motors allows a smaller 2250 pack to be used and, with other savings – motors, props, and ESCs, weight reduces to around 35 oz from 42 oz. At 140 W/Ib, there is still plenty of oomph!

The model climbs vertically, feels lighter and is quieter. So don’t fret if you like the design but don’t like the complexities of the contra system. Q&EFI

Plan MW3435 Laser Cut Wood Pack WP3435 Short Kit SET3435

What’s in a Laser or CNC Cut Wood Pack?

A CNC or Laser Cut Wood Pack contains most, if not all, of the intricately shaped parts shown on the plan, which would be difficult or time-consuming to cut out by hand. It does not contain any sheet or strip wood, which you will need to buy separately. Alternatively, you can purchase an Additional Wood Pack, if available. Our Laser or CNC Cut Wood Packs only contain balsa, ply & lite ply and do not include other materials that may be required to complete the model, such as hardwoods, metals & GRP sheets.

What’s in a Short Kit?

A short kit usually contains, where available, the plan, the laser/CNC cut wood pack, additional wood pack, canopy, cowl or any other available Glass Fibre or plastic moulded items.

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