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11-19-2007, 04:46 PM
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Join Date: Feb 2006
Location: Pagosa Springs, CO
Posts: 130
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Jack Norris' Propeller book
After a couple of years of Jack holding the check I wrote him at Oshkosh, I received his book a couple of months ago. I had meant to write in here and tell everyone how great it is, but somehow it slipped through the cracks.
So, I would like to tell you that this is a wonderful book. It is only a bit mathematical, but gets the idea of how a propeller actually works across better than anything I have read. It is written in a unique style that has the reader imagining he is sitting in the classroom, listening to a charismatic professor tell all. The math that resulted from Jack's investigations helped Paul Lipps design his props, and also produced the Whirlwind RV200 prop.
Also included is another whole book (when you flip it over) called The Logic of Flight. Here Jack tells you how to fly your airplane efficiently.
Jack was the Technical Director for the Voyager 'round the world flight and a lifelong PhD aero engineer, and you can learn a lot from this book.
It is self-published, so send Jack Norris $14.95 plus 2 or 3 bucks for shipping...
Jack Norris
11613 Seminole Circle
Northridge, CA 91326
Have fun,
John
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11-19-2007, 07:08 PM
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Join Date: Feb 2005
Location: Bakersfield ,Calyfornia
Posts: 922
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he was an excellent speaker at Bakersfield's EAA meeting last Wed. night.
they invited him back for their Year end Banquet.
He basically kept saying you don't want a prop with a blunt tip-- to a whole room full of people with-- blunt tips. on their Harmon Rockets.
I showed him a prop on a Rocket and we came to the conclusion that on that prop anything over 2550 rpm's wouldn't help any.
So I ran 2550 rpm's in the Rocket Race and I think the next time I run it will be 2750rpm's for a comparsion.
Aren't you the guy that had a smoking fast RV8 in the Rocket Race?
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11-20-2007, 06:44 AM
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Join Date: Feb 2006
Location: Pagosa Springs, CO
Posts: 130
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Yes, that was me, thanks!
At Reno this year, I went to the sneak preview of the Thunder over Reno movie. I was sitting with friends, and there was an empty chair next to me. A little old guy came along and asked if he could sit there...turned out to be Jack Norris. I had already read his book and we had a great talk, halfway ignoring the movie. It is amazing how the very smartest guys are also the most humble and likable.
John
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11-20-2007, 11:35 AM
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Join Date: Mar 2005
Location: Southern California
Posts: 196
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Quote:
Originally Posted by mark manda
he was an excellent speaker at Bakersfield's EAA meeting last Wed. night.
they invited him back for their Year end Banquet.
He basically kept saying you don't want a prop with a blunt tip-- to a whole room full of people with-- blunt tips. on their Harmon Rockets.
I showed him a prop on a Rocket and we came to the conclusion that on that prop anything over 2550 rpm's wouldn't help any.
So I ran 2550 rpm's in the Rocket Race and I think the next time I run it will be 2750rpm's for a comparsion.
Aren't you the guy that had a smoking fast RV8 in the Rocket Race?
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Hi Mark,
In testing on Ted Rutherford's HR2, the "D" blade Hartzell decreased airspeed by going from 2600 RPM to 2700 RPM. The "J" blade hartzell kept increasing in airspeed up to 2800 RPM. This on a "stock" IO-540.
Another report I received on the "J" blade Hartzell in an F-1 Rocket with a 330 hp IO-540 said that the airspeed decreased by going from 2600 RPM to 2700 RPM.
Test what you have, and find your own RPM "sweet spot" for your race (density) altitude.
I have been reading Jack Norris' Propeller book, also. Jack is a member of the local Chapter 723, and his book is written much like he talks. I have found that Jack is one of the few people that has the insight to understand the data I am getting in my propeller (cruise performance) testing.
Jim Ayers
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12-18-2007, 09:10 AM
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Join Date: Feb 2006
Location: Pagosa Springs, CO
Posts: 130
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Jack now has a website with information about his book.
http://www.propellersexplained.com/
John
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12-18-2007, 10:01 AM
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Join Date: Mar 2005
Posts: 5,685
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Sent the Money
I mailed him $20 and I am looking forward to the book. I believe there is so much black magic and B.S. about props that it is agrevating to me. I do not believe I am getting the most out of my system because of prop limitations as far as maximum speed is concerned. I am certainly hoping the book provides some clear answers but I'm not holding my breath. Of course doing something about it will remain a problem. I am convinced that no "off the shelf" prop is going to be the optimum prop for the speed of my airplane - that agitates me - a lot.
Bob Axsom
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12-18-2007, 10:07 AM
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Join Date: Jun 2006
Location: 8I3
Posts: 3,564
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I have read this book and the useful information can be condensed down into about five pages. The rest of it is written in such a rambling style that its almost painful to read.
__________________
Please don't PM me! Email only!
Bob Japundza CFI A&PIA
N9187P PA-24-260B Comanche, flying
N678X F1 Rocket, under const.
N244BJ RV-6 "victim of SNF tornado" 1200+ hrs, rebuilding
N8155F C150 flying
N7925P PA-24-250 Comanche, restoring
Not a thing I own is stock.
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12-18-2007, 07:47 PM
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Join Date: Mar 2005
Posts: 5,685
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I received the book
I received the book in the mail this evening. The author Jack Norris wrote me a sincere encouraging note in the book and I have no doubt that I will learn from the content. The book is 1.25" thick and the pages are 9" high and 6" wide. This will compete for my reading time as I have recently discovered the works of David Baldacci but this is such a big deal that it will command my attention. There is a website http://www.propellersexplained.com.
Bob Axsom
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12-30-2007, 10:30 AM
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Join Date: Mar 2005
Posts: 5,685
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No Pain no gain
Quote:
Originally Posted by rocketbob
I have read this book and the useful information can be condensed down into about five pages. The rest of it is written in such a rambling style that its almost painful to read.
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I am in the process of reading the book and I feel your pain. I have not found that it turns me off but the effort to make sure the reader gets the message by repetition is a little painful. Jack says he uses the 2x4 hitting the head approach to drive the message in to the point of easy comprehension so I guess he knows it will be a little agonizing at times. He says he is doing this so everyone who wants to know everything there is to know about propellers without any engineering or math strength will be able to achieve their goal just by reading this book. Every time I go to the bathroom it is required reading (I may name a hemroid "Propeller") but so far I am hooked enough that I continue to read it instead of my David Baldacci novels that are waiting to be read.
Bob Axsom
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12-30-2007, 12:02 PM
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Join Date: Feb 2006
Location: Pagosa Springs, CO
Posts: 130
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Bob, I found it helpful to imagine myself in a classroom, with a professor up front who is very enthusiastic, stands up on tiptoe and raises his voice sometimes when he thinks something is important, and is otherwise maybe a little crazy. Kind of like Professor Irwin Cory, but technical.
There is still a lot of content there.
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