G-ERUP (oz9355)

About this Plan

G-ERUP (Gerup). Radio control low-wing STOL model, for .40 - .60 power.

Quote: "...a low wing, scale-looking aircraft with minimal wing loading coupled with high lift and anti-stall devices. To elaborate on the major points:

1. Low wing and scale appearance. The low wing position is chosen simply to give neutral stability to improve aerobatic performance. Scale appearance, obviously because it looks better, but it can involve weight penalty, hence structure is kept to the minimum of material. The undercart is very important on this type of aircraft and is rather long so as to give a high attack angle on take off. It also gets some very rough treatment on slow landings, so great resiliency is required.

2. Low wing loading. Obtained by building lightly and having a large wing area. (Attempts at beefing up should be avoided).

3. High reserve of power. The motor used is a .61 of modest performance, so some of the current 40's would be adequate. This model flies happily on very reduced power and would probably fly on a good .29. However, when taking off with lots of flap and with high power, the slow - nearly vertical - climb is very impressive.

4. High lift devices. This basically is a slotted flap for 50 per cent of the wingspan. It is a one-piece device and hence is continuous where it crosses under the fuselage. This gives, at certain flap and power settings, a 'blown flap' effect, and thus very low flying speeds. To maintain adequate control at these very low air speeds, the control surfaces of the aircraft are very large in area. Because of this large control area, care should be taken to ensure that control hinging and servo linkages have minimum flop or backlash. This is not so important at low flying speeds, but becomes very critical at high speeds..."

Gerup, Radio Modeller, January 1978.

Direct submission to Outerzone.

Supplementary file notes

Article pages, thanks to RFJ.

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