Loopstick (oz3912)

 

Loopstick (oz3912) by P Lovegrove from Model Aircraft 1960 - plan thumbnail

About this Plan

Loopstick. A 49 inch span radio control sport model. From Model Aircraft, July 1960.

Quote: "In which CP Lovegrove describes the design and construction of his GG model - LOOPSTICK.

I HAVE definite ideas on model design and these have been justified in practice. The layout which I have always favoured is shown in Fig. 1, and the model Loopstick, published this month, incorporates these ideas.

The span of around 48 in is ideal in that one can have an all up weight of 3 to 4 lb and power up to 4 cc (and possibly 5 cc), yet the servo motor can still move adequate control areas against the slipstream.

In general, the restricted power of the servo places a limitation on the size of model in which the GG can be employed. If the rudder and elevator surfaces are too large, then the pulse rates must be lowered overall and the model will waggle excessively in flight or, in extreme cases, full up elevator may be unobtainable.

I find that an Ever-Ready TG 18 motor will swing an elevator 19 x 1-1/8 in and a rudder 5-1/2 x 1-3/4 in at plenty of speed. No aerodynamic balancing is necessary or desirable. A long moment arm should be used since it gives these advantages:

(i) One can see the model diverging from a horizontal path in time to correct it.
(ii) The deflecting and correcting effort from the control surfaces is large due to the leverage available.
(iii) The control surfaces are small enough to be moved properly by the servo motor.

Loopstick, its predecessors and successors, have been designed for rapid construction. (My fastest time of building was the spare time of four week-days, and I did get to bed!)

You are bound to write off models occasionally, but I got tired of shattering Mighty Midgets in every minor crash, so changed to Ever-Ready TG 18B motors which can easily be fitted with MM gears as shown in Fig. 2. These motors may, on occasion, break from their bases through bad cementing but a spot of polystyrene rectifies this easily enough, and the motor itself will survive a crash that nearly obliterates the model. Another advantage is that this motor can be bolted straight on to a ply plate built into the plane.

Constructing Loopstick. Wings: cut out the ribs, spar webs and dihedral braces using aluminium templates to ensure accuracy. Pin one lower mainspar to the plan and also pin down the 1/4 in sq rear spar over scraps of 1/16 in sheet. Cement the mainspar dihedral brace in position and fit the first rib up against its end, then cement the spar webs and ribs in place. Add the top mainspar and the LE and leave to harden..."

Update 20/08/2020: Replaced this plan with a clearer copy (patterned background removed) thanks to TonyP.

Direct submission to Outerzone.

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Loopstick (oz3912) by P Lovegrove from Model Aircraft 1960 - model pic

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Loopstick (oz3912) by P Lovegrove from Model Aircraft 1960 - pic 003.jpg
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