Abraxxas

Here is a little comparison chart I put together for some of the most popular four strokes being used and considered for the current abundance of .40 sized 3D aircraft. I got all the info from the manufacturers websites. I mainly wanted to compare the weights from one size to the next and from one manufacturer to the next on like sized engines.

Make & Size Weight Output RPM range
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SAITO .56 14.46oz .9hp 2000-12000rpm
SAITO .65 19.40oz .95hp 2000-11500rpm
SAITO .72 16.58oz 1.2hp 2000-12000rpm
SAITO .80 19.05oz 1.3hp 2000-11500rpm
SAITO .91 18.34oz 1.6hp 2000-11500rpm
SAITO .100 20.80oz 1.8hp 2100- 9300rpm

OS .52S 14.19oz .9hp 2300-13000rpm
OS .70 Ultimate 18.60oz 1.2hp 2000-13000rpm
OS .70 S 20.10oz 1.0hp 2000-12000rpm
OS .70 II 20.30oz 1.1hp 2000-12000rpm
OS .91 SII 22.90oz 1.6hp 2000-12000rpm

YS .63FZ 17.90oz N/A 2000-12000rpm

daveopam

My Feedback: (9)

More than 2 oz difference between the Saito .91 and 1.00. Wow! That hard to believe. I was thinking of going from a .72 to a 1.00 for my Funtana. I think I'll look a little harder at the .91.
later David

Abraxxas

Yeah, my .72 does great on my Funtana, but watching Zaks videos of his I wish mine had the vertical speed to do bigger maneuvers while carring enough speed that they dont drag out so much. I was thinking 100 but after comparing??? Was thinking the same as you... This chart shines some light on the subject

Sprink

If you want to update you list, I read somewhere that the YS 63 has 1.5 hp

Ed_Moorman

My Feedback: (1)

You guys have got to quit looking at advertised horsepower. It is just that, advertising.

For weights, I can tell you a few that I have personally weighed on my Sunbeam Postal scale. All are with muffler, ready to bolt on and fly.
Saito .91 20.5 ounces
Saito .72 18.1
TT .46Pro 17.1 (for comparison)

You can see the Saito .72 & TT .46Pro are within 1 oz of being the same. The .91 is only 2 1/2 ounces more than the .72.

I had the .72 in my TopCap ARF. It was adequate, but fairly tail heavy. I needed down elevator to land. I replaced it with a Saito .91/APC 15-4W moved to the back of the motor mounts. Landings are nice, now, but the vertical is like a rocket. Much nicer plane to fly.

I put a second Saito .91 in my new Extreme 330, which I read here on RCU comes out tail heavy. Again, I moved the engine to the rear of the mount so as to not be too nose heavy. Great combination.

I like the .91 in 40 sized planes for a couple of reasons. First, it adds a bunch of power over a .46. Next, it doesn't add that much weight and since a lot of planes come out tail heavy with a .46, it works out great, in my opinion. Third, for cost, it is $40 less than the Saito 100. For larger planes, the 100 may be the cat's meow, and I know everyone raves about it, but for the 40 size, I think the .91 is the best buy.

Note I have KrazyLegs gear on both planes.