Nitro props vs electric props
12-04-2009, 08:13 PM
#2
RE: Nitro props vs electric props
You can use a nitro prop on an electric, if it doesn't lug it down to much and draw too much current. For instance, I some times use an Evolution 9x6 on my Parkzone T-28 and works fine. 
Using electric props on nitro is a NO NO.[X(][X(][X(] They can't handle the RPM and vibration of a nitro engine!!!
Using electric props on nitro is a NO NO.[X(][X(][X(] They can't handle the RPM and vibration of a nitro engine!!!
12-04-2009, 08:59 PM
#3
Senior Member
RE: Nitro props vs electric props
"Using electric props on nitro is a NO NO. They can't handle the RPM and vibration of a nitro engine!!!"
By and large this is true but some of the direct drive E props are run at extremely high RPMs. Not sure but this sounds like it is exceding 30,000 RPM: http://www.youtube.com/watch?v=3XUVk...eature=related
Still, I would not tell anyone to use an E prop on Nitro engines or vice-versa.
Robert
By and large this is true but some of the direct drive E props are run at extremely high RPMs. Not sure but this sounds like it is exceding 30,000 RPM: http://www.youtube.com/watch?v=3XUVk...eature=related
Still, I would not tell anyone to use an E prop on Nitro engines or vice-versa.
Robert
12-04-2009, 09:32 PM
#4
RE: Nitro props vs electric props
To expound a little further, you might be right about the plane in the video turning 30,000rmp. But that was probably a 4" to 5" prop max. When you get into larger electrics, say .60 size airframes and up, many people do use nitro props. In the .40 sized electrics and parkflyers there are a few nitro props that will work ok, but the performance is usually not as good as props designed for electric. Props designed for these electrics are too light and thin to be used on nitro engines.
12-05-2009, 12:53 AM
#5
Senior Member
RE: Nitro props vs electric props
ORIGINAL: hugger-4641
To expound a little further, you might be right about the plane in the video turning 30,000rmp. But that was probably a 4'' to 5'' prop max. When you get into larger electrics, say .60 size airframes and up, many people do use nitro props. In the .40 sized electrics and parkflyers there are a few nitro props that will work ok, but the performance is usually not as good as props designed for electric. Props designed for these electrics are too light and thin to be used on nitro engines.
To expound a little further, you might be right about the plane in the video turning 30,000rmp. But that was probably a 4'' to 5'' prop max. When you get into larger electrics, say .60 size airframes and up, many people do use nitro props. In the .40 sized electrics and parkflyers there are a few nitro props that will work ok, but the performance is usually not as good as props designed for electric. Props designed for these electrics are too light and thin to be used on nitro engines.
Robert
12-07-2009, 11:56 PM
#7
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RE: Nitro props vs electric props
correct about what prop on what, of course.
The reason you can't put an E-prop on an IC engine isn't the RPM though. It's because the force on the prop isn't constant, it surges with each combustion, and slows down on each compression. A while back some guys with some seriously high quality measuring gear actually recorded and graphed the speed of the prop during each revolution. The stresses on the prop are quite high just from this. And that doesn't even take into account the occasional backfire when starting. I've seen plenty of props intended for glow use throw a blade on start, never mind those thin e-blades.
The reason you can't put an E-prop on an IC engine isn't the RPM though. It's because the force on the prop isn't constant, it surges with each combustion, and slows down on each compression. A while back some guys with some seriously high quality measuring gear actually recorded and graphed the speed of the prop during each revolution. The stresses on the prop are quite high just from this. And that doesn't even take into account the occasional backfire when starting. I've seen plenty of props intended for glow use throw a blade on start, never mind those thin e-blades.
