GAS EQUIVALENTS TO GLOW ENGINES?
Hey Guys,
I have a plane that had a ST2500 on it and I want to go to the gas equivalent of that engine. How do you determine what gas engine would replace a glow engine? The ST2500 was swinging a 20x6 JZ prop, I need to swing that same prop on a gasser and get the same thrust. Thanks Loopman ;) |
RE: GAS EQUIVALENTS TO GLOW ENGINES?
The formula I use is 1 cubic inch is equal to 17 cubic centimeters plus ten percent. So, if you had a 2.0 glow, it would convert to 2x 17cc, + 10% = appx37.5cc, round off to 40cc. Hope this helps. red
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RE: GAS EQUIVALENTS TO GLOW ENGINES?
I believe a 2500 is 25cc , what type of rpms are you getting with the 20x6? Depending on the rpms you need and engine set up ( front or rear carb, exhaust, mount, ect. ) that will tell you the rest. I'm guessing anywhere in the 30-35cc range.
Andy |
RE: GAS EQUIVALENTS TO GLOW ENGINES?
ORIGINAL: Loopman Hey Guys, I have a plane that had a ST2500 on it and I want to go to the gas equivalent of that engine. How do you determine what gas engine would replace a glow engine? The ST2500 was swinging a 20x6 JZ prop, I need to swing that same prop on a gasser and get the same thrust. Thanks Loopman ;) just for reference my DLE30 swings a 19x6 Xoar Beech wood 8k rpm |
RE: GAS EQUIVALENTS TO GLOW ENGINES?
To give you some idea I replaced a 35cc gas engine on a scale biplane with a ST2500 running straight fuel, no nitro and saw a pretty large gain in performance. I would think you need at least a 40cc gasser if not bigger to equal the ST2500. My ST2500's will turn a 18X8 prop ( should be equivalent to a 20X6) at 9,000 rpm. I use a 1.5 multiplier when trying to equate gas to glow, seems close.
Larry |
RE: GAS EQUIVALENTS TO GLOW ENGINES?
0.60cui = 10cc
therefore a 25cc or ST2500 is 1.50cui. power wise you probably looking for a 30cc gasser to do the same thing. |
RE: GAS EQUIVALENTS TO GLOW ENGINES?
The st2500 ia a 14.7cc engine. So a 15-20cc gas would be the equivalent. No the gas won't turn the same rpm's but the added torque will turn a bigger prop. I'm running several of the 20cc in 60 size airframe's with larger prop's, 17x8 to 18x8. Love the ease of gas well enough I got rid of all my nitro.
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RE: GAS EQUIVALENTS TO GLOW ENGINES?
I'm pretty sure the ST2500 is a 25cc...
Closest displacement equivalent is a Evolution / MVVS 26cc which will also swing 18" to 19" inch props. But 30cc i snot much bigger physically so it'll swing a 20x6 or 20x8 pretty well |
RE: GAS EQUIVALENTS TO GLOW ENGINES?
My bad, pulled up wrong engine.
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RE: GAS EQUIVALENTS TO GLOW ENGINES?
ORIGINAL: Loopman Hey Guys, I have a plane that had a ST2500 on it and I want to go to the gas equivalent of that engine. How do you determine what gas engine would replace a glow engine? The ST2500 was swinging a 20x6 JZ prop, I need to swing that same prop on a gasser and get the same thrust. Thanks Loopman ;) |
RE: GAS EQUIVALENTS TO GLOW ENGINES?
prop data / sizes without manufacturer is pretty useless info.
work out the thrust from your prop brand and size and rpm, then look from there......... |
RE: GAS EQUIVALENTS TO GLOW ENGINES?
ORIGINAL: Loopman Hey Guys, I have a plane that had a ST2500 on it and I want to go to the gas equivalent of that engine. How do you determine what gas engine would replace a glow engine? The ST2500 was swinging a 20x6 JZ prop, I need to swing that same prop on a gasser and get the same thrust. Thanks Loopman ;) Why are you soooooo over proped on the ST2500????? my ST's ran 10500 on an APC 17 x 6 pumped on a Bisson muffler (~16 lbs thrust). I currently still run a ST3250 on an Evolution 18 x 6 beechwood prop on a bisson muffler (~ 18 lbs thrust). I can only imagine how low on the performance curve that 20 x 6 prop is on that engine. OK nuf said, basic question how do you determine what engine to another: 1. Weight. 2. RPM on same prop 3. Mounting considerations. 4. Cost. Any of the common gas 26's will give better rpm on your JZ 20 x 6 than your current choice. (I might go with a beam mount like the MVVS or EVO). |
RE: GAS EQUIVALENTS TO GLOW ENGINES?
You could have the ST converted to gas and not have to change out the engine. There are a couple of places doing this conversion, and I have heard it works pretty well.
http://www.lambertsrc.com/index.html This is one I have heard about. |
RE: GAS EQUIVALENTS TO GLOW ENGINES?
The correct Prop for a Super Tigre 2500 is an 18 x 6. The ST 3000's would turn a 18 x 8, and 18 x 10. Running a 20 x 6 prop would certainly be way beyond what a 2500 could pull efficiently, and throttle response would be slow. A moddern 30 cc gas engine would certainly be a fair replacement, and similar weight overall.
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