well Link me a picture of your 3DHS NITRO model then ?



Specifications:
Stock Number: DLEG0020
Displacement: 20 cc (1.22 cu in)
Bore: 1.3 in (32 mm)
Stroke: 1.0 in (25 mm)
Weight: 28.9 oz (820 g)
RPM Range: 1,750-9,000
Output: 2.5 hp @ 9,000 rpm
Requires: unleaded gasoline, 2-cycle oil, ignition battery & propeller
Includes: electronic ignition, muffler, spark plug, gasket, bolts, throttle arm extension & manual
Suggested Propellers: 14x10, 15x8, 16x6, 16x8, 17x6
Suggested Break-in Prop: n/a


YS qoute from the net...
" you should be able to run a APC 16x6 prop and get around 9000 rpm's...give or take a little "