[Paulchee]

What is the best prop size that works well for this engine? I'm using it in a P-51 mustang. Right now I'm using a 19X8 wood prop and only getting 7300rpm tops. The plane was too sluggish.

[Heli_Gal]

FA-220A AAC w/Muffler: AD

Key Features
Legendary Saito 4-stroke superiority!
Highest output single cylinder Saito engine
Packs a full two inches of combustion into a case barely bigger than that of most 1.80-size engines
Swings 19x8 prop at 8100 rpm
Lighter than similar displacement gas engines
Overview
Saito takes power-to-weight superiority to new heights with the FA-220—its biggest single-cylinder ever. Packing a whopping 2.2 cubic inches into slightly larger than a 1.80-size case, the FA-220 will give medium to large-scale aerobats like Hangar 9's 27% Extra 260 out-of-sight unlimited performance. And besides the usual Saito benefits like canted valves for better mixture flow and that oh, so satisfying four-stroke sound, the FA-220 has an optional fuel pump as well as a sleek new head design that improves airflow around the cooling fins.
Specs
Type:4-stroke
Displacement:2.20 cu in (36.30 cc)
Bore:1.49 in (38.00 mm)
Stroke:1.26 in (32.00 mm)
Cylinders:Single - Chrome Plated
Total Weight:1149g (40.5 oz)
Engine (Only) Weight:1049g (37.0 oz)
Muffler Weight:100 g (3.50 oz)
Crankshaft Threads:M8 x 1.25 mm

Benchmark Prop:19x8 @ 8100 rpm

Prop Range:17x12 - 20x8
RPM Range:1900-10,000
Fuel:10%-30% Synthetic
Mounting Dimensions:194 x 75 x 158 mm
Muffler Type:Cast
Cylinder Type:AAC
Carb Type:Barrel, 2 needle valve
Crank Type:Ball Bearing

Needed to Complete
Propeller: 19x8


You should be able to lean it up a bit to 8100RPM... you're 800RPM less.

[luv2flyrc]

Depends on the prop, a 19x8 Menz S is not going to turn same RPM as a 19x8 Mejzlik.

Mike

[Paulchee]

I bought a 18x8 and 18x6w abc that i'm trying tomorrow. Hobby Hobby had no 19x8 or 19x6.

[Heli_Gal]

Have you try AJ hobbies in Vaughan? They have a wide range of props including carbon fibre props.

[Paulchee]

Put a 18X8 APC on today and recorded 8800rpm. The plane flys great with that size. Has lost of pull and climb rate. The style of the prop works good. I think a 20X8 APC brand should work good with this motor......Time will tell.