Mail Sack, Thanksgiving.


Here are some letters on various topics. On the subject of Machine vs appliance, USAF (F-4)/ATP, 601XL builder Bob Pustell writes:

“I like your comments about machines verses appliances. I have spent several weeks reinstalling my overhauled 65 year old Franklin engine into my 65 year old Stinson airplane. Both are marvelous machines. Both are good for another 65 years. I could have done the installation more rapidly (or hired someone to do it) but part of the charm is doing the work, making the wire runs look orderly, getting the push-pull cables rigged just so, etc etc. The only down side to this infatuation is that the effort required to keep a two thirds of a century old airplane airworthy cuts deeply into my building time. I am enjoying myself.-Bob “

Zenith 650 Builder and CC#22 grad Brian Manlove writes:

 “William – and even “appliances” are not immune to the habitual machine lover… as can attest the numerous “gone forever” toasters, fans, and other consumer stuff that cannot escape the hand of the person who hates waste. Count me in for April – that will hopefully be my run-time. Thanks.”

Builder Don January writes:

“doing a great job, hope to fly soon corvair is done working on panel”

Builder Tom Griesemer sr. Writes:

“Absolutely!!! I want to be the first to sign up as Leesburg is only 75 miles from my home. I have only just started my engine (which you helped me find) but would like to bring it. I will be there. Thanks William.-Tom G.”

Sprint builder Joe Goldman writes:

Where my Sprint currently lives, Roy Hall , the owner of the place has a good crank and other parts for the OX5. He also has a restored but uncovered fuselage and I think wings for a 1927 travelair 2 seater just sitting there next to me. He also has a lathe that is 110 years old, still used with its AC/ DC electric motor and leather belt drive. It is geared for cutting various threads and my axles were made on it. My Corvair engine comes to Florida in Feb. Anyone wants to drive or fly, (Lantana airport is close) is invited. It is amazing where building a plane and a Corviar engine takes you. PS In 1968 I bought my love a 1953 stude starliner.-Joe”

On the subject of Corvair College #24 reviewed in pictures:

Aircamper builder Jon Coxwell writes:

“William, I want to thank you for all the time you spent with my engine at CC#24. It was such a joy when it finally fired up. I am certain that if I had tried to fire it up on my own that it would have been very frustrating. Now I know it runs and move forward. I hardily recommend to anyone using a Corvair to get to at least one of your colleges. My engine is now back in my shop on the bench.  I read through the 601 installation manual in the motel on the way home. There is certainly a lot of good stuff in there and I found a lot things that indeed will apply to my GN-1 (piet look alike). I anxiously await the manual you are preparing for the Pietenpol. Each College that I have attended, I have learned something new and made some new friends as well. I want to pass on, that my son was impressed with what you are doing and I believe he thoroughly enjoyed himself. I certainly enjoyed having him there. Living 2000 miles apart means we don’t see much of each other. Thanks again for your help and the great experience.-Jon Coxwell-GN-1 Aircamper”

SP-500 builder, Pratt-Whittney aero engineer and Corvair College#23 grad Spenser Gould writes:

“Impressive photos from cc24, looks like a lot of good process was made at the event by the builders, having my engine run on the stand in cc23 was very inspirational. The work from You, Dan & Ed is a big part in keeping the homebuilt movement going in today’s world.-Spencer”

Builder Dave Gingerich writes:

“Mr. Wynne, could you please send me an email address for Dave Aldrich. I would like to get the data for the Sensenich prop shown. I have a computer program that computes the thrust and horsepower for any speed and any rpm. I have data for the C150 prop, but haven’t been able to get any for a typical prop running on a Corvair powered slow airplane.”

Dave, Mr. Alderich is still working on the plane for the prop. Other than Corvairs, the only part of Aviation that I have some degree of mastery with is props. I have been a dealer for a number of different brands, tested dozens, collected a lot of data, set up an FAA prop repair station, and was lucky enough to have both Ernest Jones and Vance Jauqua as personal mentors on propulsion. ( this is like being able say your two guitar teachers were Jimi Hendrix and Eric Clapton) Let me offer this modest observation: All computer programs are based on an algorithm. Even an incredibly complex set of equations is going to be an incredibly simplified model of what is actually taking place. It is likely just OK at predicting behavior of run of the mill props because that is what virtually all the models are based on. Such a program isn’t going to be accurate at all in predicting the behaviour of a smaller diameter/ higher rpm prop like a Corvair. Ernest Jones had a PhD in this subject, and he directly showed me how a very complex 3D computer wind tunnel model of a prop,spinner/cowling/windshield model reviewed on one degree angle of attack increments painted a different picture of the required prop. If you want to learn more about props, read Fred Weick’s 1930 book. If you want a good prop for a plane your building, data from flying pilots is a far better predictor than computer programs.-ww

Zenith 650 builder Brian Manlove writes:

 “I’m really enjoying your posts once again… and sad that I couldn’t go to CC24. I just stopped by Kevin Purtee’s house yesterday and had a great visit. His garage is quite a testimonial to the great people in the Corvair world. It makes me feel really good to know that I am in the company of such folks and walking a proven path… and I’m inching ever closer. I just finished the right wing for my 650, started on the left, the fuselage is right around the corner. I want to finish N129BZ in 2013. Please keep the comments coming… I hope y’all have a great time at the event, and I’m looking forward to getting to another one as soon as I possibly can.-Brian”

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