04 May 2025, 17:50 [ UTC - 5; DST ]
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Post subject: Re: OT: Lancair Evolution  Posted: 23 Jan 2014, 11:56 |
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Joined: 11/22/12
Posts: 2813
Post Likes: +2765
Company: Retired
Location: Lynnwood, WA (KPAE)
Aircraft: Lancair Evolution
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Username Protected wrote: Out of curiosity, what data does GE have that shows it gets better sfc? So far, the GE H80 is used by one US OEM (Thrush) and two King Air 90 mod programs. All report better sfc as well as lighter weight. I haven't seen the thp of the H85 but I haven't looked.
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Post subject: Re: OT: Lancair Evolution Posted: 23 Jan 2014, 14:27 |
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Joined: 12/17/10
Posts: 1626
Post Likes: +276
Location: Valparaiso, IN
Aircraft: Lancair Evolution
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Username Protected wrote: Out of curiosity, what data does GE have that shows it gets better sfc? So far, the GE H80 is used by one US OEM (Thrush) and two King Air 90 mod programs. All report better sfc as well as lighter weight. I haven't seen the thp of the H85 but I haven't looked.
Well, aren't the king air mods replacing the -21? Which has less horsepower than the H80 and the -21 is the worst sfc engine that Pratt makes. Not exactly apples to apples.
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Post subject: Re: OT: Lancair Evolution Posted: 23 Jan 2014, 21:12 |
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Joined: 11/22/12
Posts: 2813
Post Likes: +2765
Company: Retired
Location: Lynnwood, WA (KPAE)
Aircraft: Lancair Evolution
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Username Protected wrote: Out of curiosity, what data does GE have that shows it gets better sfc? Upon further review, I don't have data to compare sfc. All the comparisons of the H80 vs. PT6 in the same airframes that I can find show more range and/or less fuel for the same trip for the H80 but much or all of that appears to come from more power = faster climb to efficient altitude. That doesn't tell us which has better cruise sfc, just that they have to be in the same ballpark so the faster climb isn't overshadowed by a huge cruise FF difference. The main selling points of the GE engine are its lighter weight (probably why it was chosen for the Primus 150, for the CG) and lower maintenance costs.
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Post subject: Re: OT: Lancair Evolution Posted: 23 Jan 2014, 21:17 |
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Joined: 12/17/10
Posts: 1626
Post Likes: +276
Location: Valparaiso, IN
Aircraft: Lancair Evolution
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Username Protected wrote: Out of curiosity, what data does GE have that shows it gets better sfc? Upon further review, I don't have data to compare sfc. All the comparisons of the H80 vs. PT6 in the same airframes that I can find show more range and/or less fuel for the same trip for the H80 but much or all of that appears to come from more power = faster climb to efficient altitude. That doesn't tell us which has better cruise sfc, just that they have to be in the same ballpark so the faster climb isn't overshadowed by a huge cruise FF difference. The main selling points of the GE engine are its lighter weight (probably why it was chosen for the Primus 150, for the CG) and lower maintenance costs.
Does the GE engine require a time based maintenance like the Walter did? If I'm not mistaken, there wasn't a hot section requirement on the engine, but there was a time based requirement that said the engine had to be pulled every 8 years and shipped off for maintenance.
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Post subject: Re: OT: Lancair Evolution Posted: 13 Feb 2014, 14:03 |
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Joined: 08/12/08
Posts: 7665
Post Likes: +2410
Company: Retired
Location: Santa Barbara, CA
Aircraft: '76 A36 TAT TN 550
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Username Protected wrote: Upon further review, I don't have data to compare sfc. All the comparisons of the H80 vs. PT6 in the same airframes that I can find show more range and/or less fuel for the same trip for the H80 but much or all of that appears to come from more power = faster climb to efficient altitude. That doesn't tell us which has better cruise sfc, just that they have to be in the same ballpark so the faster climb isn't overshadowed by a huge cruise FF difference. The main selling points of the GE engine are its lighter weight (probably why it was chosen for the Primus 150, for the CG) and lower maintenance costs. Hi Dave, If you and Kelly would relocate to Santa Barbara we could explore some type of partnership! How much is a good used TBM? Do we need a 3rd? I might have one.   
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