The home of the worlds best R/C Model Aircraft Designers

UK Manufactured to order: Guaranteed Quality

Login        FAQ

info@sarikhobbies.com   +44 (0)1684 311682

Login        FAQ

30 years Experience

Of Scratch Building & Modelling
The Home of the Model Builder

Made in our Workshop

Laser Cut & Printed to Order
Guaranteed Quality & Detail

FROM EVERYONE AT SARIK HOBBIES

Arup S2 'Heel Lift'
Arup S2 'Heel Lift' - Laser Cut Wood Pack

Arup S2 ‘Heel Lift’ (42″)

(1 customer review)
SKU: GP-MW3399 Categories: , , , Tag:
3 Items Available

A 42” span near scale ‘flying wing’ for .40-size engines and 4-function R/C. Designed by Keith Humber.

Add to Wishlist
Plans printed to order
Wood Packs laser cut to order
Arup S2 'Heel Lift'

Plan & Article for this 42” span near scale ‘flying wing’ for .40-size engines and 4-function R/C. Designed by Keith Humber.

 £20.00Add to basket
Arup S2 'Heel Lift' - Laser Cut Wood Pack

Laser Cut Wood Pack for this 42” span near scale ‘flying wing’ for .40-size engines and 4-function R/C. Designed by Keith Humber.

 £178.00Add to basket
Buy the Short Kit & Save 10%Arup S2 'Heel Lift' - Laser Cut Wood Pack

Short Kit (Set) includes Plan, Article & Laser Cut Wood Pack for this 42” span near scale ‘flying wing’ for .40-size engines and 4-function R/C. Designed by Keith Humber.

 £198£178.00Add to basket

Specification

  • Designer: Keith Humber
  • Wingspan: 42″ / 1067 mm
  • Power Source: IC Propeller
  • Radio Functions: 4
  • Scale: 1:5.42
  • Length: 38″ / 965 mm

Full Description

Keith Humber’s near-scale 42” span design of this 1933 ‘flying wing’ is powered by a 6.5 cc engine and 4-function R/C. Construction is all wood from the detailed 2-sheet plans. Flying characteristics are typical for this type and should be flown by experienced pilots only.

  • Designer: Keith Humber
  • Wingspan: 42″ / 1067 mm
  • Power Source: IC Propeller
  • Radio Functions: 4
  • Scale: 1:5.42
  • Length: 38″ / 965 mm

The Full Size: – Design – The full-size Arup S-2 featured a straight leading edge wing with a trailing edge that tapered to the rear of the aircraft giving it a guitar pick shape when viewed from above. An M6 airfoil was chosen over its predecessor’s sharp-edged, modified Clark-Y airfoil. The large trailing edge control surfaces were mixed for pitch and roll control but were assisted by small, movable, semi-circular wingtips that could provide additional roll control. The conventional landing gear was used, faired with wheel pants. The access to the cockpit was from a belly-mounted hatch. Visibility was enhanced with celluloid panels on the aircraft’s belly. Operational history – The prototype S-2 was test flown by Glen Doolittle. The STOL aircraft could fly at up to 35 degrees angle of attack without stalling. The aircraft was demonstrated across the country at events like the Indianapolis 500 and the 1933 National Air Races. Later it was demonstrated to the Army, NACA and CAA in Washington. D.C. Raoul Hoffman left Arup after the development of the S-2 to create his own design, the Hoffman Flying Wing. Engineer Charles H. Zimmerman viewed the S-2 trials in Washington and later applied the principles to the Vought XF5U program. The S-2 was sold without an engine to a stuntman, F.F. Bowser Frakes, who performed air crashes at fairs. A Szekely radial engine removed from an American Eaglet was installed on the S-2 but did not perform well. A propeller was acquired from Milt Hatfield, who sourced the landing gear for the first S-1. Hatfield demonstrated how to fly the aircraft and it eventually crashed in a show.

Images kindly supplied by Kenny Beggs and model builder Alastair Nicol

Plan MW3399 Laser Cut Wood Pack WP3399 Short Kit SET3399

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.

CLICK HERE for further information & our FAQs

1 review for Arup S2 'Heel Lift' (42")

  1. Jorgen Pedersen –

    A great little model, but not an easy build
    The instructions suggest this is an easy assembly, I would tend to disagree. The instructions suggest building the wing upright (vertically) balancing the wing ribs on the leading edge, with the ribs sticking upwards. This may be possible if you knew the centerline of each rib – but unfortunately that is not provided. An alternative approach would be to supply tabs on the ribs to build it horizontally, but again none are provided. I opted to build it horizontally, by adding my own tabs to the ribs, which worked well. The second issue is the suggestion of bending balsa around really tight curves to form the wing spars, I tried multiple times, ended up distorting the wing profile and snapping he balsa. So I opted to add separate balsa parts and then sand them to the right profile – much simpler and significantly less stress on the wing. The third issue is adding the trailing edges, which again has significant curves, after two attempts I got this done, but have now noticed a warp in one of them so will have to cut off this section and redo. Again this could be done much easier by having a laser cut shaped Trailing edge notched into the wing ribs.
    From the size of the servo’s I suspect this is an older design, it calls for servos to be mounted to 2x snake connectors which go through the wing and poke out underneath the wingtip ailerons. I have opted to add two smaller servos mounted in the wing tips which directly connect with the ailerons.
    The scale machine had full moving wingtip controls, on this model for stability reasons they have been changed to fixed leading edges with trailing edge ailerons. I couldn’t bring myself to deviate from the scale machine so opted to put fully movable ailerons, – which may end up being my nemesis.
    This is not a bad plan, and it does look pretty neat, but it is not a simple build, and probably requires someone who has done this a few times before.

Add a review

You may also like…

Shopping Basket0
Nothing in the basket!
Continue shopping
0