Killerwatt (oz13085)

 

Killerwatt (oz13085) by Colin Usher 2010 - plan thumbnail

About this Plan

Killerwatt. Radio control sport aerobatic model. Wingspan 1485 mm, for .40 engines.

Note this is a clone of the Chris Foss Acro Wot design.

Note this plan was previously available as a free download, from the now-defunct Colin Usher website. We found this file in 2021 using the Wayback machine, see datafile link.

Quote: "The Killerwatt (Kilowatt) is a perfect follow on model from a Watt Four. It is a low wing design, slightly bigger at 1485 mm and uses a modified shape of tailplane & fin similar to a Watt Four. In fact the wing is so similar a friend uses an old Watt Four wing on his Killerwatt. Apart from the added 50mm it is more or less identical, even using the same airfoil.

As with the Watt Four a plan for the ACROWOT was never issued, so if you crash, need a spare or just like building you have a problem. Again the Killerwatt is not, for copyright reasons, identical to any other design.

I am reliably informed that this model will fly very well on a good 25 but a 40 is probably better. The prototype was fitted with an OS 46 MAX FX. The constructional details are my own and the outline shapes vary slightly, as does the airfoil. This is an NACA 63 0 18 at the root & 63 0 15 at the tip.

Electric Version hence the Killerwatt (Kilowatt): The plan as drawn is for an OS 46 MAX FX, but a version is flying with an AXI 4120/14 660 kv Brushless motor, a JETI 70w Advanced SB ESP, together with a Winforce 5 cell Li-Po pack running a 12 x 8 prop. Cheaper alternatives are a KSM 4120/06 660kv with a Wasp 70W Opto ESP from BRC. A 4 cell Li-Po also works but without the extra power of a 5 cell. You will need to put a hatch in the fuselage in front of the canopy for battery access.

Flying: The model has now flown more or less straight off the building board. A small amount of up trim was required but otherwise perfect. No signs of a tip stall, even on tight slow turns, ** nice flat even stall with no wing drop and a very flat glide on tickover. Very stable with an almost vertical climb. Needs plenty of aileron for Rolls, Loops and Stall turns no problem. A nice docile model all round.

** The original Acro Wot had a tendency to tip stall I am told but the slight dihedral, and most importantly the 2° washout seems to have cured this often fatal problem.

Supplementary file notes

Ribs drawing.

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