Pietenpol-List: 4 blade prop

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Pietenpol-List: 4 blade prop

Post by matronics »

Original Posted By:> John Hofmann
Subject: Pietenpol-List: 4 blade prop UNCLASSIFIEDDan, Love the look. Discussion on another list (Beech) talked quite a bit about the value of goingfrom 2 to 3 blades on General Aviation airplanesTwo blades is more efficient than three blades in all areas, except ground clearanceand noise. On most prop planes the prop makes most of the noise, Engineis second. Look at the videos of the electric Sonex E-flight. The plane is almostas noisy as a regular plane. One member is an aerodynamics professor. He said it came down to this. The verymost efficient prop is a Single, Big, Long Blade turning at slower RPM with greattorque. Yes, a single, one side is a blade, the other is like a club. Asyou add, blades they become smaller bladed and shorter and less efficient. asyou get into 3,4 and more blades they nowstart to run in each other's turbulanceand the airflow becomes less smooth. Smaller diameter props have to run fasterto make the same thrust. Also the Prop becomes more of a gyroscope as bladesare added. That is why early planes with low horsepower engines, turning slow with big propswere somewhat efficient. while early ultralights with fast turning chainsawengines turning small props make a lot of noise with wasted horsepower.Blue Skies,Steve D On 07/11/13, helspersew(at)aol.com wrote:> I'll chop'em up with this.> > Dan Helsper> Puryear, TN> > > -----Original Message-----
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Re: Pietenpol-List: 4 blade prop

Post by matronics »

Original Posted By: Dortch, Steven D MAJ MIL USA NGB
Dears, it was the best definition I've heard for this case until now. I have years working with airplanes and this was the best.Thank you!Roberto Serrano,www.kraussaero.com.br-----Mensagem Original-----
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Re: Pietenpol-List: 4 blade prop

Post by matronics »

Original Posted By:> -----Mensagem Original----- Dortch, Steven D MAJ MIL USA NGB
Look up advance ratio. In addition there is a slip factor where a small diameter high speed prop is betterfor higher speed plane.SteveOn Jul 12, 2013, at 6:27 AM, wrote:> Dears, it was the best definition I've heard for this case until now. I haveyears working with airplanes and this was the best.> Thank you!> Roberto Serrano,> www.kraussaero.com.br>
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Re: Pietenpol-List: 4 blade prop

Post by matronics »

Original Posted By:> > -----Mensagem Original----- Dortch, Steven D MAJ MIL USA NGB
Subject: Re: Pietenpol-List: 4 blade prop UNCLASSIFIED Yes, The discussion was based on somewhat slow general aviation aircraft. Not300 MPH screamers but up to 200 MPH plus or minus General aviation planes. Alsobased on currently availiable props, not on any breakthrough technology.Blue Skies,Steve D On 07/12/13, Steve Emo wrote:> > Look up advance ratio. > > In addition there is a slip factor where a small diameter high speed prop isbetter for higher speed plane.> > > Steve> > On Jul 12, 2013, at 6:27 AM, wrote:> > > Dears, it was the best definition I've heard for this case until now. I haveyears working with airplanes and this was the best.> > Thank you!> > Roberto Serrano,> > www.kraussaero.com.br> >
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Post by matronics »

Original Posted By: Dortch, Steven D MAJ MIL USA NGB
That's where I have the advantage....the breakthrough technology I am using. The way I figure it, I'll be able to go twice as fast with the two extra blades.Dan HelsperPuryear, TN-----Original Message-----
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Re: Pietenpol-List: 4 blade prop

Post by matronics »

Original Posted By: "contato (at)kraussaero.com.br"
>> > > > Subject: Pietenpol-List: Alliance Ohio Fly-in>> > > >>> > > >>> > > "Pietflyer1977" >> > >>> > > >>> > > > Is anyone in the Midwest going to the Barber Airport>> > > >>> > > fly-in this weekend>> > > in Alliance, OH ? Anyone ever go? A good fly-in with a good>> > > turn out? Thanks>> > >>> > > >>> > > >>> > > >>> > > >>> > > > Read this topic online here:>> > > >>> > > > http://forums.matronics.com/viewtopic.p ... 31#404431)>> > > >>> > >>> > >>> > >>> > > Email Forum ->> > > - MATRONICS WEB FORUMS ->> > > List Contribution Web Site ->> > > -Matt>> > > Dralle, List - The --> > > (blockedhttp://www.matronics.com/Navigator?Pietenpol-List" > > target="1">http://www.matr &n - &nbs --> > > http://www.matronics.com/co================>> > >>> > >>> > >>> > >>> >>> >> >> >> w,courier" size="2"> _blank">http://www.matronics.com/contribution> UNCLASSIFIED> > > ________________________________________________________________________________Date: Fri, 12 Jul 2013 08:25:47 -0300Subject: Re: Pietenpol-List: 4 blade prop
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Re: Pietenpol-List: 4 blade prop

Post by matronics »

Original Posted By: helspersew(at)aol.com
> >> > > > Subject: Pietenpol-List: Alliance Ohio Fly-in> >> > > >> >> > > >> >> > > "Pietflyer1977" > >> > >> >> > > >> >> > > > Is anyone in the Midwest going to the Barber Airport> >> > > >> >> > > fly-in this weekend> >> > > in Alliance, OH ? Anyone ever go? A good fly-in with a good> >> > > turn out? Thanks> >> > >> >> > > >> >> > > >> >> > > >> >> > > >> >> > > > Read this topic online here:> >> > > >> >> > > > http://forums.matronics.com/viewtopic.p ... 31#404431)> >> > > >> >> > >> >> > >> >> > >> >> > > Email Forum -> >> > > - MATRONICS WEB FORUMS -> >> > > List Contribution Web Site -> >> > > -Matt> >> > > Dralle, List - The --> > > (blockedhttp://www.matronics.com/Navigator?Pietenpol-List" > > target="1">http://www.matr &n - &nbs --> > > http://www.matronics.com/co================> >> > >> >> > >> >> > >> >> > >> >> >> >> > >> > >> > >> w,courier" size="2"> _blank">http://www.matronics.com/contribution> > UNCLASSIFIED> > > > > > > > UNCLASSIFIED________________________________________________________________________________Subject: Re: Pietenpol-List: 4 blade prop
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Pietenpol-List: Re: 4 blade prop

Post by matronics »

Original Posted By: "womenfly2"
> >> > > > Subject: Pietenpol-List: Alliance Ohio Fly-in> >> > > >> >> > > >> >> > > "Pietflyer1977" > >> > >> >> > > >> >> > > > Is anyone in the Midwest going to the Barber Airport> >> > > >> >> > > fly-in this weekend> >> > > in Alliance, OH ? Anyone ever go? A good fly-in with a good> >> > > turn out? Thanks> >> > >> >> > > >> >> > > >> >> > > >> >> > > >> >> > > > Read this topic online here:> >> > > >> >> > > > http://forums.matronics.com/viewtopic.p ... 31#404431)> >> > > >> >> > >> >> > >> >> > >> >> > > Email Forum -> >> > > - MATRONICS WEB FORUMS -> >> > > List Contribution Web Site -> >> > > -Matt> >> > > Dralle, List - The --> > > (blockedhttp://www.matronics.com/Navigator?Pietenpol-List" > > target="1">http://www.matr &n - &nbs --> > > http://www.matronics.com/co================> >> > >> >> > >> >> > >> >> > >> >> >> >> > >> > >> > >> w,courier" size="2"> _blank">http://www.matronics.com/contribution> > UNCLASSIFIED> > > > > > > > UNCLASSIFIED________________________________________________________________________________Subject: Pietenpol-List: Re: 4 blade prop
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