Take a look at the specs on these engines and please give some advise as to what engine is best.

FS-70 II Surpass $219.00

SPECIFICATIONS
Stock Number: OSMG0872
Displacement:0.702 cu in (11.5 cc)
Bore:1.02 in (26 mm)
Stroke:0.87 in (22 mm)
Practical rpm:2,000-12,000
Output: 1.1 hp @ 11,000 rpm
Weight:20.3 oz (580 g)

O.S. .50 SX Ringed $209.00



SPECIFICATIONS
Stock Number: OSMG1951
Displacement: 0.499 cu in (8.17cc)
Bore: 0.866 in (22mm)
Stroke: 0.847 in (21.5mm)
Practical rpm range: 2,000-20,000
Output:1.9 hp @ 17,000 rpm
Weight: 14.3 oz (406g)
Includes: 60LH carburetor, #8 glow plug
Requires: muffler, drive hub

Saito 72 $224.00
16.6 oz,

Saito 82 $254.00
17.6 oz

YS 63 $239.87
RPM Range: 2,000 to 12,000 RPM
weight: 16.23 oz. (460 grams)



0s .50 fx Ringed $159.99
SPECIFICATIONS:
Stock Number: OSMG0550
Displacement: 0.499 cu in (8.17cc)
Bore: 0.866 in (22mm)
Stroke: 0.847 in (21.5mm)
Output: 1.8 hp @ 17,000 rpm
Practical rpm range: 2,000-20,000
Weight: 13.8 oz (390g)
Recommended Props: 10x8, 11x7