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21 Jun 2025, 12:15 [ UTC - 5; DST ]


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 Post subject: Re: LearFan if built today
PostPosted: 04 Dec 2024, 14:10 
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Joined: 01/10/17
Posts: 2213
Post Likes: +1591
Company: Skyhaven Airport Inc
Aircraft: various mid century
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It’s almost always better to have one big engine than two small ones on a gearbox. More efficient, less weight and mechanical complications. Today it would have 1 big PT-6 or GE equivalent.

Pusher or tractor configuration? The market is used to a tractor appearance like the PC12 and Caravan, after 25 years that looks “right” to buyers, so no surprise Textron went that way with Denali.

A modern Learfan would be a pusher Denali, I guess, what would it have that the Denali does not?


A lot more performance than the Denali. No cargo door but 1400 FPM Single engine rate of climb! Less useful load than Denali? But faster so less fuel needed for the same trip.

I wish Beech had bought this design to make instead of the Starship using. It would have been a C90 replacement instead of a replacement for the 200/300 series. Maybe also a jet version instead of the Premier.

Engines P&W PTO-35, flat rated at 650 shp each
Prop Hartzell, 4-blade, 90-in. dia.
TBO 3,500 hrs.
Length 39 ft. 8 in.
Height 11 ft. 6 in.
Wingspan 39 ft. 4 in.
Wingarea 163 sq. ft.
Max ramp weight 7,250 lbs.
Max takeoff weight 7,200 lbs.
Standard empty weight 4,000 lbs.
Max useful load 3,250 lbs.
Zero-fuel weight 5,900 lbs.
Max landing weight 6,850 lbs.
Wing loading 44.2 lbs. per sq. ft.
Power loading 5.5 lbs. per hp
Max usable fuel 250 gals./I,675 lbs.
Certificated ceiling 41,000 ft.
Max pressurization differential 8.3 psi 8,000-ft. cabin altitude at 4 1,000 ft.
Max rate of climb 3,700 fpm
Single-engine rate of climb 1,400 fpm
Single-engine service ceiling 29,000 ft.
Max cruise speed (31,000 ft.) 350 kts.
Economy cruise speed (41,000 ft.) 304 kts.


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 Post subject: Re: LearFan if built today
PostPosted: 04 Dec 2024, 14:22 
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Joined: 11/15/17
Posts: 1108
Post Likes: +576
Company: Cessna (retired)
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It's why belt drives are (IMO) the more elegant solution for pistons

You’re right, but in the same vein that Jesse describes about how something “looks right” to consumers, there’s always somebody who’s convinced that belts are bad because his friend’s timing belt broke 30 years ago. Sometimes stubbornness is well-funded.


It is not just belts; I got stranded when a plastic tooth timing gear broke on a 1974 Capri.

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