.91 glow vs. 20 cc gas
09-29-2017, 03:48 AM
#2
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They are not that similar. The DLE 20 is a good bit bigger and heavier, making more power and swinging a bigger prop. They really aren't in the same class with each other. An OS or RCGF 15cc gas engine would be more of an equivalent to the .90. In that case, you have more torque and less RPM and a bit less overall power, very much like going to a .90 4 stroke.
10-08-2017, 11:15 AM
#4
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I would say power wise they are very close assuming you are talking about a .91 two stroke. They are substantially different in weight and physical size. I have a 65" span Hellcat which I flew for about 5 years with a OS .91FX before changing over to an Evolution 20cc gasser. The performance is similar enough between the two that I can't tell any difference in the way the airplane performs from one to the other. I've got a DLE20 on another Hellcat and it flies about the same although it may not have quite as much power as the Evolution. But not significantly less. The weight difference was no issue for me since I had dead weight in the airplane for balance anyway and the total overall weight was the same with either engine. That may not be the case with your model. My .02 cents.
10-09-2017, 12:37 PM
#6
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Beware of putting a heavier engine on the Epsilon. I have flown one for almost 10 years. With the OS .91, the CG was spot on. The plane was designed around that engine. I eventually upgraded to the OS 1.20AX, not much heavier than the .91, but I had to move the battery to the tail to balance. Anything heavier on the nose and you'll be adding lead to the tail.
Great airplane. The .91 is really a nice power plant for most flying on this plane. The 1.20 does give that extra oomph on vertical maneuvers. Can power out of vertical snaps and continue climbing all day. But going to the 1.20 (2 stroke), I do have a tendency to tip the 15" props on landing regularly, so be careful of needing any prop larger than that.
Dave
Great airplane. The .91 is really a nice power plant for most flying on this plane. The 1.20 does give that extra oomph on vertical maneuvers. Can power out of vertical snaps and continue climbing all day. But going to the 1.20 (2 stroke), I do have a tendency to tip the 15" props on landing regularly, so be careful of needing any prop larger than that.
Dave
