Upstairs Maid (oz10001)

About this Plan

Upstairs Maid. Rubber lightweight by RJ North.

Quote: "We do not present this model as one which has achieved extremely long flights, or one which will return fantastic average durations, in calm air; nevertheless, it may be said to be one of the best models that never won a competition. It was flown on full turns only sixteen times and the average flight worked out; it was best at Gravesend in the Inter-Area Contest.

Building Instructions. Wing and Tail. It is as well to cut about 25 per cent more ribs than you expect to need, to allow for breakages; do not use wood for the ribs weighing less than about 12-15 lb/cu ft.

Put the spar in last of all, and I strongly recommend that you use the method of jointing at the breaks for dihedral which is shown. It is essential to use the 1/32 in sheet alongside the ribs at the dihedral joints, otherwise you'll find that the covering increases the undercamber locally.

Try to find some reasonably hard wood for the leading and trailing edges. The airfoils for wing and tail have the maximum ordinates at about 40 percent chord, because we have found that arrangement to give consistently good results, whereas having the maximum ordinates farther forward seemed to make matters worse on occasion. The NACA 6409 was the starting point; recent experi- ments in moving the maximum ordinates even farther back produced no startling results.

Fuselage. Endeavour to get four medium hard lengths for the fuselage longerons, because it certainly pays if you manage to keep the model any length of time. The fuselage is wide enough at the rear peg position for your assistant to insert one or two fingers to hold the peg when you are winding.

The wing mount wire (22 gauge) may seem a little weak, but in a crack-up it will bend rather than rip out the fixings..."

Scan from DBHL, cleanup by theshadow.

ref DBHL-6252.

Direct submission to Outerzone.

Supplementary file notes

Article, thanks to RFJ.

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