11 Feb 2026, 11:01 [ UTC - 5; DST ]
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Post subject: Re: GE/CFM Open Fan design  Posted: 04 Feb 2026, 16:51 |
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Joined: 12/24/18
Posts: 671
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Location: KHFD
Aircraft: F33A
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I started my master's thesis on propfan/wing integration in the late 70's.
A prof (not my advisor) asked for my research just before winter break. As I was a poor college student and 10 cents per page copying fees were budget busters, I gave him all my data.
After winter break, I attempted to retrieve everything, but the professor kept brushing me off. A few months later my research was published under this prof's name and I was SOL.
When I lamented to my father (a college professor himself) that I had been royally screwed, his response was "that's what grad students are for."
The job market was red hot and I departed academia. I've never looked back....
(I'll post some of the technical and other issues I remember with this concept if anyone's interested)
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Post subject: Re: GE/CFM Open Fan design Posted: 04 Feb 2026, 17:58 |
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Joined: 12/03/14
Posts: 21290
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Company: Ciholas, Inc
Location: KEHR
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Username Protected wrote: (I'll post some of the technical and other issues I remember with this concept if anyone's interested) Obvious issues to me are: 1. Noise, particularly in the cabin. 2. Passenger perception (not a jet). 3. Dealing with icing conditions. Mike C.
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Post subject: Re: GE/CFM Open Fan design Posted: 05 Feb 2026, 14:23 |
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Joined: 01/03/20
Posts: 117
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Aircraft: Navion B
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Last time they were trying that, they were calling those engines "Ultra High Bypass."
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Post subject: Re: GE/CFM Open Fan design Posted: 05 Feb 2026, 17:36 |
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Joined: 11/22/08
Posts: 3144
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Company: USAF Propulsion Laboratory
Location: Dayton, OH
Aircraft: PA24, AEST 680, 421
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Username Protected wrote: (I'll post some of the technical and other issues I remember with this concept if anyone's interested) Obvious issues to me are: 1. Noise, particularly in the cabin. 2. Passenger perception (not a jet). 3. Dealing with icing conditions. Mike C.
Those were and still are issues. The first generation of research with this concept spawned from the Middle East oil embargo in the early 1970's and the resultant high fuel prices. Congress directed NASA to look at fuel saving concepts for aviation. A lot of tech development was required and by the time they were close to mature, fuel prices dropped again and interest was lost. We tested a few of those props in our facility years ago.
I think the passenger perception might not be a problem any longer. A lot different flying public now. And besides with jet bridges most people don't look at the exterior of the plane.
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Post subject: Re: GE/CFM Open Fan design Posted: 05 Feb 2026, 18:24 |
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Joined: 12/03/14
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Company: Ciholas, Inc
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Username Protected wrote: I think the passenger perception might not be a problem any longer. A lot different flying public now. And besides with jet bridges most people don't look at the exterior of the plane. But they won't see "jet" on their ticket any more, when buying the ticket in particular. The public won't accept that something that has prop blades is a "jet". Mike C.
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Post subject: Re: GE/CFM Open Fan design Posted: 05 Feb 2026, 18:29 |
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Joined: 03/28/17
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Username Protected wrote: I think the passenger perception might not be a problem any longer. A lot different flying public now. And besides with jet bridges most people don't look at the exterior of the plane. But they won't see "jet" on their ticket any more, when buying the ticket in particular. The public won't accept that something that has prop blades is a "jet". Mike C.
Not even a JETprop or propJET? 
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Post subject: Re: GE/CFM Open Fan design Posted: 06 Feb 2026, 16:00 |
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Joined: 11/22/08
Posts: 3144
Post Likes: +1086
Company: USAF Propulsion Laboratory
Location: Dayton, OH
Aircraft: PA24, AEST 680, 421
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Username Protected wrote: I think the passenger perception might not be a problem any longer. A lot different flying public now. And besides with jet bridges most people don't look at the exterior of the plane. But they won't see "jet" on their ticket any more, when buying the ticket in particular. The public won't accept that something that has prop blades is a "jet". Mike C.
LOL. My last domestic flight on Spirit airlines was a one-time cross-country experiment I’ll never repeat; it turns out $50 is the exact price point where passengers stop being able to spell the word "airplane," let alone identify the propulsion system.
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Post subject: Re: GE/CFM Open Fan design Posted: 06 Feb 2026, 17:11 |
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Joined: 01/30/09
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Username Protected wrote: Last time they were trying that, they were calling those engines "Ultra High Bypass." Sort of like "small modular nuclear reactors". "Small" being less scary to the public....
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Post subject: Re: GE/CFM Open Fan design Posted: 06 Feb 2026, 17:15 |
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Joined: 05/14/19
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Location: MCW
Aircraft: 7ECA
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Username Protected wrote: I think the passenger perception might not be a problem any longer. A lot different flying public now. And besides with jet bridges most people don't look at the exterior of the plane. But they won't see "jet" on their ticket any more, when buying the ticket in particular. The public won't accept that something that has prop blades is a "jet". Mike C.
From my experience here when we had scheduled service on a Cessna Caravan, the general public sees anything with a propeller instantly as being from the 1940s, even a brand new from the factory turboprop. The average person would rather be on a 30 year old jet than a brand new prop. Its all perception.
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Post subject: Re: GE/CFM Open Fan design Posted: 06 Feb 2026, 18:39 |
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Joined: 12/03/14
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Username Protected wrote: The average person would rather be on a 30 year old jet than a brand new prop. I agree! I am on a 34 year old jet all the time. Mike C.
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