Schiffermuller (oz15881)

About this Plan

Schiffermuller. Radio control sport model. Wingspan 72 in, for 40-45 four stroke or 30-40 two stroke engines.

The free flight Schiffermuller (oz5683) design first appeared in Aeromodeller Annual, 1947. This here is a later version enlarged and adapted for RC.

Quote: "Based on a 27 in free-flight design featured in 1947 Aeromodeller Annual."

Quote: "My interest in Schiffermuller's design started two weeks before the 1983 Old Warden Vintage Day, when thumbing through a 1948 Aeromodeller Annual my eye was taken by his perky little 29in. span low wing free fighter which fitted my idea of something different for the big day. The original model was powered by Dart diesel in my first Schiffermuller, which has given me hours of exciting flying fun (ROGs at different engine speeds are magic).

Eventually I decided to produce an enlarged R/C version (2.5 times) which followed the shape, used the same wing construction (Gottingen 436) and general construction of my small version. Mr Schiffermuller's original design was monocoque fuselage with fixed wing, but I opted for slab sides with turtle decking and a split, removable wing.

The resulting model has proved to be easy to build and is easy to transport.

Before starting construction study the plan then decide where and how you will site engine, fuel tank (plan shows a PAW. 35 and a smallish plastic tank, a larger capacity custom made one makes better use of space) throttle linkage and radio gear, etc.

After studying the plans you will notice that there is a lot of aeroplane behind the CG, that's why I chose the PAW 35 arrangement because I was able to cram all the engine gubbins including fuel tank into the engine bay, which meant I could have the flight batteries up to F1 well in front of the CG.

Fuselage Construction: The fuselage is a simple box construction with added formers and stringers, the whole covered by sheet balsa. A description of the building sequence may help, so off we go.

Don't forget to wax or cover the plan with a clear film. Cut out all formers, etc, gussetts, stern posts, pushrod exit panel (1 off) then cut to length uprights and cross pieces (I mark and tape each pair together).

To build the two side panels pin 1/4 x 1/4 in space longerons to plan, glue into place the various components (I used PVA glue). Build second side over first (separate by using a sheet of cling film over first side) then leave to set well.

Remove sides from plan, glue into place R23 and servo rails then shape the stern ends to the taper as showy on plan. Next pin the inverted sides to plan view, after applying glue to stern post areas and add cross pieces, taking great care to keep structure vertically square. Bottom formers, underfin, stringers undercarriage blocks, and 1/4 in sheet bottom can be added.

Remove from plan when set and epoxy into place F1 and F3 make up engine plate and screw to bearers before fitting them to formers (use epoxy) using a square to ensure accuracy.

The wing platform is fitted now between bottom longerons and resting on F23. Now the six 1/4 in sheet gussetts can be epoxied into place against F1.

F2 and F9 to F14. can go into place followed by spines and stringers, etc. The radio hatch cover is built in situ using a double layer of cling film to prevent sticking, followed by 1/16 planking of complete top front end. Next stage is 1/16 sheet covering as per plan..."

Direct submission to Outerzone.

Supplementary file notes

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