Black Magic (oz6)

 

Black Magic - plan thumbnail image

About this Plan

The New Black Magic. Free flight power model. Fred Hempsall's 1947 plan for a 60 in sport model here is redesigned for RC flying, in Aug 1956 Aeromodeller.

Quote: "BLACK MAGIC was first published in the September 1947 Aeromodeller, and has been a firm favourite of thousands of sport fliers ever since. Good looks, clean lines and snappy reliable performance have accounted for its success.

Reader R Garman, searching for a suitable radio control design for his ED 2.46 decided Black Magic had definite possibilities and wrote to the Editor regarding structural modifications. It was decided to strengthen the mainplane anchorage, the fuselage cabin structure and the wing tips. The fin area was increased and the original knock-off plate type engine mount replaced with an adaptable ply plate on bearers, which will accommodate varying sizes of motor. Mr Garman still favours the old type mounting, however, and says it has saved his crankcase on several occasions, so we leave this particular design feature to the choice of the individual builder.

The new drawing shows installation for the normal battery sizes, e.g., B122 or B123 for H/T and U12 for L/T, etc. Mr Garman, however, uses a set with fairly heavy current consumption and therefore employs heavier batteries.

Those people who have flown radio models extensively will appreciate another suggestion by Mr Garman. Instead of leaving the rear undercarriage legs as one complete length of wire he cuts it through the centre, taps the two ends 4 BA and joins them by means of a 4 BA sleeve. This
enables the undercarriage to be replaced when necessary without disturbing the structure. Those people without taps and dies could easily solder a copper sleeve over the two ends, which would do the job just as usefully.

Another scheme would be to insert a hardwood block between formers F2 and F3 at the bottom of the fuselage and attach by means of bolts inserted in the block, a 14-gauge strip dural one-piece undercarriage. This provides an easily removable unit which can be replaced when necessary and is a popular method in America particularly with radio control kit models such as the Trixter Beam (oz2864) and Live Wire (oz5554) series."

Update 29/06/2016: article page, text & pics added, thanks to RFJ.

Supplementary file notes

Article page, text & pics.

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Black Magic - completed model photo

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