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Post by coyote on Sept 26, 2014 14:14:41 GMT -4
OK - Feedback requested
What are the most affordable and working gas engines for
50 size? 90 size? 120 size?
I'm told Evolution engines (15GX) are good for 90 size
All I have are four strokes, and while they sound cool, they suck nitro like a baby goes through milk.
Therefore I've been looking at gas engines in a new light (remember I'm old so I'm just catching up to the mini skirt era)
Anyone have any suggestion sor tips for gas engines?
Tks in advance.
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daver
Members
Posts: 2,268
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Post by daver on Sept 26, 2014 15:26:16 GMT -4
The 10 cc Evolution, from the experience I've had, is it's amazing. Sets up, runs, breaks in, and pretty much sounds, just like a 2 stroke nitro. Great way to get started in gas. It's a great swap for the .46 50 sized 2 stroke. Also, it burns way less fuel. Mod your original tank to gas, you'll get twice the flying time, or more, or put in a smaller tank, less aircraft weight. Also, you can put the tank virtually anywhere, no issues, even move it back a ways. That's why I keep thinking about them for my DC-3, with the fuel tanks in the centre of the wing.
90 -120 sized, tons of options. AMR sells the RCGF engines, very affordable, they run great. 20 CC RCGF in my Corsair, tons of power, way more than enough, and the plane needs the extra weight in the nose anyways. In the Sukhoi, it's stellar. For a bigger bird, like my Super Decathelon, that's a 26 CC, again, RCGF is great, but DLE is a great choice as well. I've got a DLE 35RA in my Spit. I specifically wanted that engine, it's perfect for a long nosed warbird like a spit, rear exhaust with pitts muffler, so nice and narrow at the front, nothing sticking out the sides. Perfect.
Note, probably a good thing to think about, with gas, is what are you putting it on? A newer design, will already be robust enough to handle gas. Top flite Warbirds, are all over built, so they can handle the vibration just fine. Older kits though, like my Sukhoi, were never meant for gas. I had to do a lot of reading up, and beefing up of the fuse and wings, to ensure that I wasn't going to vibrate the airplane to death. Super attention to distributing stress, balancing your prop, etc, will pay off big time.
I'm still not sold on the 4-stroke gassers, like Red John has. Why? Super expensive, not anywhere near as quiet as a 4-stroke nitro, and they seem really finicky on the carb settings. I think the issue is trying to convert a 4 stroke nitro, over to gas, vice designing a gasser from the ground up. I don't touch the settings on my gassers, unless there's been a huge difference in temp/humidity, and even then, it's tiny adjustment, and go. I flash up, idle for a few seconds to warm up the engine, then go. It's about as hassle free as it gets.
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Post by yorcram on Sept 26, 2014 18:51:09 GMT -4
26cc gas = 120 glow "power" replacement. 20cc gas = .60-.90 glow replacement 15cc gas = .50 glow replacement That is based on my personal experiences and from what I have read online.
DLE 20 is very popular and reliable once broken in. However, some are hard to setup when new (stock spark plugs are apparently crap).
RCFG 20-26cc are popular and run well. I have 26cc RCFG in the 72in Fw190 ... 20cc in my 65in P47. Maritime Hobbies can get these engines.
With gas, you will need kill switch for engine (i get mine from thunderbolt rc or sdshobbies) programmed on the Tx.
You will also need a power source for your ignition module. I use a BEC fed from a 3s lipo for power.
I use 40:1 oil in my 20 &26cc gas engines. 10-15cc gas engines seam to need 25:1 mix so you may need two fuel containers for your smaller planes.
You will also need to use gas fuel tubing and replace.fuel tank stopper with one for gasoline.
mr
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Post by Red John on Sept 27, 2014 4:40:28 GMT -4
I do not have any experience other gas engines, but I do agree with Dave about the Saito 17 4 stroke. In addition I am very disappointed with the amount of un-burnt oil that comes through the crankcase vent. It is a 20:1 mix and this rich mixture makes for a lot of oil down the bottom of the plane. Lots of power, love the sound, but if I was doing it over I would stick with the 2 stroke gas. John
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Post by coyote on Sept 27, 2014 5:44:04 GMT -4
All great inputs....anyone else?
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