Test prop is the best

The relatively flat blades give good performance at those speeds, and excellent take-off performance, but I expected that they would run out of puff at higher speeds compared to the high-helix props like the Bollie and the Kool.  But testing shows this not to be the case, in that at the same manifold pressure settings, the Brolga performed at 86kts, within one knot of both the Warp and the Kool!  The pitch blocks only come in one degree steps.  16º is a bit too fine for cruise, giving WOT 6000rpm, but 17º is over-pitched for best take-off.  Since the Brolga is under-pitched, the rpm for the same manifold pressure setting is higher, but the speed was still the same......  I had expected that this large 4-blade prop would be best at take-off and noticeably slower at such speeds, but it seems not to be the case.......  At WOT it gave 100+ knots, same as all the others, which was really surprising!

A handy tool for this project is the drying rack for the eyes. I made mine from two 4″ pieces of wire coat hanger and a small flat piece of scrap wood. Just drill two appropriately sized holes in the wood, cut two straight pieces of wire coat hanger and insert them in the holes. You will need to make sure that the drill bit is the same diameter as the coat hanger to ensure a tight fit. For the record, I used a thin wire hanger and a 47 gauge (″) drill bit. This will allow you work around the eyes completely without getting your fingers in the paint, and to set them aside to dry on your work surface. 

Test prop is the best

test prop is the best

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