The angle of the blade changes from tip to base. The pitch, shouldn't change.
Mach moves the center of pressure and center of lift back on an airfoil. Airfoils that work well at mach aren't very similar to good "slow" airfoils. On Aug 5, 2012 7:51 PM, "Larry&Sallie Flesner" <fles...@frontier.com> wrote: > > > > >What about the different tip shapes being used these days. Does that help > in > >reducing the tip sound on props of bigger diameters? > >I'm not sure of this question as well, I have heard of props that have > >multiple pitches set along the blades that work better at different > RPM's. I > >understand that most fixed pitch propellers have a constant pitch along > the > >blade. > >Brian > ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ > > Most prop manufactures make claims that their prop shape / tip / > airfoil / etc. is more efficient than a competitor but I've seen or > heard of very few head to head comparisons to prove the point. As > far as blade pitch, I think if you look at any fixed pitch prop > you'll find the pitch much greater at the base than at the tip. Walk > the line the next time you're at the airport and check it out. > > Larry Flesner > > > _______________________________________ > Search the KRnet Archives at http://tugantek.com/archmailv2-kr/search. > To UNsubscribe from KRnet, send a message to krnet-le...@mylist.net > please see other KRnet info at http://www.krnet.org/info.html >
