My take on gas engines:
First off all of this is all IMO.
As far as 30CC goes. I will more than likely never have another 30CC gasser. I had a DLE-30. It was ok. I had it running good, but it never ran perfect. Though to mention DLE's ignitions were pure junk, and after awhile mine went bad, causing my plane to crash and have radio issues. Now I fly electric 30CC and could not be happier. I personally feel that the planes in this size fly better on electric setups and allow for the best 3D ability.
If I ever feel the need for a gas 30ccer I will use an OS 33 or maybe an EME35 or DA 35. Never again will I touch a DLE-30 again.
While DLE engines work, I think that they are hit and miss to weather your getting a true quality product. Though for a budget build they are not bad.
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As far as 50cc engines go:
I had a DLE-55 and it ran great. It put out good power and was very reliable. Never quit on me once. Only problem I had was that I had to adjust the timing of the engine a bit after it backfired. The ignition that came with it held up to my surprise. I though I would for sure have to replace it.
Though the DA-60 is 2 times the engine the DLE-55 was. It put out much more power and really made a difference in performance. More power, and a bigger prop made my 89 into an animal. It was harder to tune than the 55, but once tuned it ran better and put out the power overall.
Though the DLE-55 is a good option, I would buy another if I didn't already have a DA-60.
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100CC and above:
I have never owned a DLE-111 but have flown some and they have run good. I have never heard of any real issues with them.
Though on planes like the 104" Slick which I have flown on a DLE-111 and DA 120, the 120 kicks its butt. Gotta love the power and reliably it gives.
Both engines flew the plane well, so it really is a matter of budget, but the extra performance of the 120 is awesome.
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Not to mention how I can send in an engine and get it repaired by DA for a decent price! I sent in my DA-60 and DA-120 and they were fixed and good as new. That is pretty sweet if you ask me.
Now when it comes to gas vs electric:
Anything below 30cc is a sure bet I will run electric. 6s for most of my setups as I do not have a bunch of 4s 4000 packs.
50CC: I plan to try out a 50CC electric soon. Two batteries is doable(12s 5000), but the flight times will suffer. I will use a Motrofly when that finally arrives
. I really hope to compare it to a gas setup and see how I like it.
100CC isn't doable for me for two reasons.
1)
The Da-120 makes amazing power with better flight time, and is lighter.
2)
And I want better flight times than 4 minutes. Not to mention, that there are not many choices for motors currently.
Hope this helps anyone looking into power there airplanes.