Interesting little gasser, I put this motor in my Black Horse 87" Hurricane and hurls it around the sky effortlessly. Plane weighs 8.5 kg or 18.73 lbs for you folk who are not into metrication. Two niggling issues with this motor: Muffler kept coming loose, any amount of locktite wont hold it in place, problem solved by using longer M4 cap screws with steel disc washers under the heads of the cap screws, the washers sit flat on the outside of the exhaust body, similar to how the OS 33 GT muffler is mounted. This means that the screws have more bite and the pressure is more even using the steel disc washers, which very conveniently had a 4mm hole in the center of them.
Should have been mounted like this ex factory. I also used high temperature silicone on the exhaust header gaskets, this gives them an absolute flat leak free area to sit on. Second issue: Muffler is quite noisy, needs baffles to hush it a little but much quieter than DLE 35 equivalent.
The Evolution 33 is an easy to start motor using an electric starter but is reluctant to re start by hand when hot, but will re start quickly with the electric starter.
Motor easily swings an 18x8 prop, according to other users, and I dare say it would easily handle a slightly larger prop, but no real advantage by doing so. I am still on my break in prop at present which is a 17x8 XOAR. Break in period is quite long and involved but worth the effort.
I like this motor because it has beam and radial mounting, gives you a much broader choice of planes to put it into, if you are replacing an old 1.60 Glow motor with the GX 33.having the beam mounting lugs is a real bonus.
For quietness and smoothness of operation, if I was given the choice of an OS 33GT
Or the Evolution GX 33, I would most likely go for the OS 33, it's just that little bit smoother and quieter and starts by hand first flick every time.
Should have been mounted like this ex factory. I also used high temperature silicone on the exhaust header gaskets, this gives them an absolute flat leak free area to sit on. Second issue: Muffler is quite noisy, needs baffles to hush it a little but much quieter than DLE 35 equivalent.
The Evolution 33 is an easy to start motor using an electric starter but is reluctant to re start by hand when hot, but will re start quickly with the electric starter.
Motor easily swings an 18x8 prop, according to other users, and I dare say it would easily handle a slightly larger prop, but no real advantage by doing so. I am still on my break in prop at present which is a 17x8 XOAR. Break in period is quite long and involved but worth the effort.
I like this motor because it has beam and radial mounting, gives you a much broader choice of planes to put it into, if you are replacing an old 1.60 Glow motor with the GX 33.having the beam mounting lugs is a real bonus.
For quietness and smoothness of operation, if I was given the choice of an OS 33GT
Or the Evolution GX 33, I would most likely go for the OS 33, it's just that little bit smoother and quieter and starts by hand first flick every time.
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