Larry,Mark and others.
I sent in a request to not be notified from this site anymore so I
won't waste anymore of your bandwidth? C'Mon kids. Your terse response
just made the points made. Good luck. Fly for the joy and gift that it is.
Selfworth really has no part of your experience.
I have met a couple of good friends and we all have experience we
bounce off each other with good friendships be made stronger and knowledge
being gained without the arrogance that appears.
When technical exceeds fun and ensuring the excitement then it has
outlived its worth.
I am better qualified in more types than many but I choose to believe
in the magic of flight and the joy of sharing the experience with other's.
Best regards to all flying kids.no matter what your
stage or station in life.
Doran
.kr2owner at gmail.com
On May 11, 2014 12:03 PM, "via KRnet" wrote:
> Send KRnet mailing list submissions to
> krnet at list.krnet.org
>
> To subscribe or unsubscribe via the World Wide Web, visit
> http://list.krnet.org/mailman/listinfo/krnet_list.krnet.org
> or, via email, send a message with subject or body 'help' to
> krnet-request at list.krnet.org
>
> You can reach the person managing the list at
> krnet-owner at list.krnet.org
>
> When replying, please edit your Subject line so it is more specific
> than "Re: Contents of KRnet digest..."
>
>
> Today's Topics:
>
>1. Re: Fw: Re: Propellers (Jeff Scott via KRnet)
>2. Larry Flesner please contact me (Ronald Wright via KRnet)
>3. Re: Drag Whoa! (Doran Jaffas via KRnet)
>4. Re: Drag Whoa! (Carl Dow via KRnet)
>5. Re: Drag (Carl Dow via KRnet)
>6. Drag Whoa! (via KRnet)
>7. Re: Drag (via KRnet)
>8. Re: Drag Whoa! (ppaulvsk at aol.comviaKRnet)
>9. Re: Drag Whoa! (Mark Langford via KRnet)
>
>
> --
>
> Message: 1
> Date: Sat, 10 May 2014 13:10:02 -0400
> From: Jeff Scott via KRnet
> To: "KRnet"
> Subject: Re: KR> Fw: Re: Propellers
> Message-ID: <20140510171002.12310 at gmx.com>
> Content-Type: text/plain; charset="utf-8"
>
> Jeff L.
>
> Yes, I think we are dancing around the same elephant. ?When I say I
> respectfuly disagree, I mean exactly that as I know you are really into
> aircraft performance and measurement with a lot of first hand knowledge. ?I
> have a lot of respect for your work.
>
> My only point was that as a general statement, a longer prop will usually
> contribute significantly to both take off and initial climb. ?As you
> stated, aircraft drag becomes the more predominant factor with speed as
> more drag is generated with more speed. ?Prop length becomes much less of a
> factor in a small slick aircraft, especially at speed. ?In fact, for high
> cruise performance, too long of a prop becomes a real detriment. ?But, if
> you calculate your prop tip speed and find that it is running down in the
> .6 - .7 mach area, you can usually improve your take off, climb and cruise
> performance with a bit longer of a prop. ?If your prop tips are making
> close to .7 mach static, a longer prop is likely to help with take off and
> initial climb, but may hinder cruise. ?If you're making .8 mach or more
> with your prop tips at cruise, then chances are you'll probably increase
> your speed by going to a shorter prop. ?When calculating the mach number of
> the prop tip, you have to factor the aircraft speed into the calculation.
> ?.75 mach static may be over .8 mach at high cruise. ?For prop tuning, a
> faster plane may require a slightly shorter prop.
>
> Wish I could tell you the measurements from the prop I had on the VW
> powered Avid Flyer, but that's been 15 years ago and all that information
> was long ago lost. ?Additionally, since this was all done at over 7000'
> altitude, the numbers probably would not be useful for near to sea level
> operations.
>
> -Jeff Scott
> Los Alamos, NM
>
> > - Original Message -
> > From: JL
> > Sent: 05/09/14 11:12 PM
> > To: Jeff Scott, KRnet
> > Subject: Re: KR> Fw: Re: Propellers
> >
> > Jeff,
> >
> > Since I don't disagree with almost everything you posted, I suspect we
> are commenting about the same elephant, but from different ends ; )
> >
> > Sounds like you found the minimum diameter prop for your airplane. May I
> ask what that prop was and at what rpm you saw no further gains?
> >
> > The only thing I would not agree with is the lumping of static thrust,
> takeoff roll and rate of climb together. I tend to view them as three
>
