10 Feb 2026, 22:50 [ UTC - 5; DST ]
|
|
Page 1 of 1
|
[ 13 posts ] |
|
|
Username Protected
|
Post subject: Re: GE/CFM Open Fan design  Posted: 04 Feb 2026, 16:51 |
|
 |
|
|
Joined: 12/24/18
Posts: 671
Post Likes: +843
Location: KHFD
Aircraft: F33A
|
|
|
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)
|
|
| Top |
|
|
Username Protected
|
Post subject: Re: GE/CFM Open Fan design Posted: 04 Feb 2026, 17:58 |
|
|
|
|
Joined: 12/03/14
Posts: 21290
Post Likes: +26841
Company: Ciholas, Inc
Location: KEHR
Aircraft: C560V
|
|
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.
_________________
Email mikec (at) ciholas.com
|
|
| Top |
|
|
Username Protected
|
Post subject: Re: GE/CFM Open Fan design Posted: 05 Feb 2026, 14:23 |
|
|
|
|
Joined: 01/03/20
Posts: 117
Post Likes: +73
Aircraft: Navion B
|
|
|
Last time they were trying that, they were calling those engines "Ultra High Bypass."
|
|
| Top |
|
|
Username Protected
|
Post subject: Re: GE/CFM Open Fan design Posted: 05 Feb 2026, 17:36 |
|
|
|
|
Joined: 11/22/08
Posts: 3144
Post Likes: +1086
Company: USAF Propulsion Laboratory
Location: Dayton, OH
Aircraft: PA24, AEST 680, 421
|
|
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.
|
|
| Top |
|
|
Username Protected
|
Post subject: Re: GE/CFM Open Fan design Posted: 05 Feb 2026, 18:24 |
|
|
|
|
Joined: 12/03/14
Posts: 21290
Post Likes: +26841
Company: Ciholas, Inc
Location: KEHR
Aircraft: C560V
|
|
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.
_________________
Email mikec (at) ciholas.com
|
|
| Top |
|
|
Username Protected
|
Post subject: Re: GE/CFM Open Fan design Posted: 05 Feb 2026, 18:29 |
|
|
|
|
 |
Joined: 03/28/17
Posts: 9216
Post Likes: +11729
Location: N. California
Aircraft: C-182
|
|
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? 
|
|
| Top |
|
|
Username Protected
|
Post subject: Re: GE/CFM Open Fan design Posted: 06 Feb 2026, 16:00 |
|
|
|
|
Joined: 11/22/08
Posts: 3144
Post Likes: +1086
Company: USAF Propulsion Laboratory
Location: Dayton, OH
Aircraft: PA24, AEST 680, 421
|
|
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.
|
|
| Top |
|
|
Username Protected
|
Post subject: Re: GE/CFM Open Fan design Posted: 06 Feb 2026, 17:11 |
|
|
|
|
 |
Joined: 01/30/09
Posts: 3959
Post Likes: +2501
Location: $ilicon Vall€y
Aircraft: Columbia 400
|
|
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....
|
|
| Top |
|
|
Username Protected
|
Post subject: Re: GE/CFM Open Fan design Posted: 06 Feb 2026, 17:15 |
|
|
|
|
Joined: 05/14/19
Posts: 962
Post Likes: +1053
Location: MCW
Aircraft: 7ECA
|
|
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.
|
|
| Top |
|
|
Username Protected
|
Post subject: Re: GE/CFM Open Fan design Posted: 06 Feb 2026, 18:39 |
|
|
|
|
Joined: 12/03/14
Posts: 21290
Post Likes: +26841
Company: Ciholas, Inc
Location: KEHR
Aircraft: C560V
|
|
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.
_________________
Email mikec (at) ciholas.com
|
|
| Top |
|
|
|
Page 1 of 1
|
[ 13 posts ] |
|
|
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum
|
Terms of Service | Forum FAQ | Contact Us
BeechTalk, LLC is the quintessential Beechcraft Owners & Pilots Group providing a
forum for the discussion of technical, practical, and entertaining issues relating to all Beech aircraft. These include
the Bonanza (both V-tail and straight-tail models), Baron, Debonair, Duke, Twin Bonanza, King Air, Sierra, Skipper, Sport, Sundowner,
Musketeer, Travel Air, Starship, Queen Air, BeechJet, and Premier lines of airplanes, turboprops, and turbojets.
BeechTalk, LLC is not affiliated or endorsed by the Beechcraft Corporation, its subsidiaries, or affiliates.
Beechcraft™, King Air™, and Travel Air™ are the registered trademarks of the Beechcraft Corporation.
Copyright© BeechTalk, LLC 2007-2026
|
|
|
|
