# Smith XP-99 Prop-Jet

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{{Infobox aircraft
| name                = XP-99 Prop-Jet
| logo                = 
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| aircraft_type       = Six seat business aircraft
| aim                 = 
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| related             = 
| national_origin     = United States
| manufacturer        = Mike Smith Aero Inc
| design_group        = 
| designer            = Mike Smith
| builder             = 
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| prototypes          = 
| number_built        = 1
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| requirement         = 
| aircraft_carried    = 
| flights             = 
| total_hours         = 
| total_distance      = 
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| introduction        = 
| retired             = 
| first_flight        = 29 July 1982
| initiated           = 
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}}

The '''Smith X-99 Prop-Jet''' was a six-seat [turboprop](/source/turboprop) powered business aircraft designed in the United States in the 1980s.  Only one was built.

==Design and development==

The Prop-Jet was an attempt to produce a small, propeller driven business aircraft capable of cruising at speeds above 350&nbsp;mph (560&nbsp;km/h).  It was powered by a 550&nbsp;shp (410&nbsp;kW) [Pratt & Whitney Canada PT6](/source/Pratt_%26_Whitney_Canada_PT6) [turboprop](/source/turboprop) engine, mounted in  a long nose and driving a four blade, [constant speed propeller](/source/constant_speed_propeller).  The [fuselage](/source/fuselage) was a [monocoque](/source/monocoque) constructed from [graphite](/source/graphite) and [glass-fibre](/source/glass-fibre) [epoxy](/source/epoxy) sandwich.  The [pressurised](/source/Cabin_pressurization) cabin accommodated pilot and five passengers in three rows of seats, with a baggage space behind.  Access was by port side doors forward and another over the [trailing edge](/source/trailing_edge) on the other side. The tail unit was made from [Kevlar](/source/Kevlar)/graphite/glass fibre epoxy sandwich. The fin was swept and the [tailplane](/source/tailplane) mounted, with [anhedral](/source/dihedral_(aircraft)), almost at the top of it. The elevator carried an electrically driven [trim tab](/source/trim_tab).<ref name=JAWA85/>

To speed the completion of the first prototype, the Prop-Jet used the wing and undercarriage of a [Beechcraft Baron 58P](/source/Beechcraft_Baron_58), though a composite structure wing was envisaged for production aircraft.  The Beech wing was a two spar aluminium box structure, without sweep and mounted [between mid and low](/source/monoplane) positions with [dihedral](/source/dihedral_(aircraft)) of 6° and fitted with slotted [Fowler flaps](/source/Flap_(aeronautics)). The [tricycle undercarriage](/source/tricycle_undercarriage) was enclosed behind doors after retraction.<ref name=JAWA85/>

The Prop-Jet flew for the first time on 29 July 1982.  By 1985 Mike Smith was reported as seeking financial backers<ref name=JAWA85/> but only the one prototype Prop-Jet was built.<ref name=aerofiles/>
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==Specifications==
{{Aircraft specs
|ref=Jane's All the World's Aircraft 1985–86<ref name=JAWA85/> ''All performance figures at maximum take-off weight except where noted.''
|prime units?=imp
<!--
        General characteristics
-->
|genhide=

|crew=One
|capacity= Five passengers
|length m=9.32
|length note=
|span m=11.53
|height m=3.2
|height note=
|wing area sqm=11.06
|wing area note=
|aspect ratio=12.02
|airfoil=modified [NACA](/source/NACA_airfoil) 23016.5 at root, 23012 at tip 
|empty weight kg=1430
|empty weight note=
|gross weight kg=
|gross weight lb=
|gross weight note=
|max takeoff weight lb=6000
|max takeoff weight note=
|fuel capacity=220 US gal (832.5 L; 183 Imp gal)
|more general=
<!--
        Powerplant
-->
|eng1 number=1
|eng1 name=[Pratt & Whitney Canada PT6](/source/Pratt_%26_Whitney_Canada_PT6)A-41
|eng1 type=[turboprop](/source/turboprop)
|eng1 kw=410
|eng1 note=
|power original=&nbsp;derated from 634 kW (850 hp)
|more power=

|prop blade number=4
|prop name=[Hartzell Propeller](/source/Hartzell_Propeller) Type HC-B4TN-3AL/LT1073F-12-5
|prop dia m=2.29
|prop dia note=constant speed

<!--
        Performance
-->
|perfhide=

|max speed kmh=
|max speed mph=
|max speed kts=
|max speed note=
|cruise speed kmh=523
|cruise speed note=economical, at 31,000 ft (9,450 m)
|stall speed kmh=138
|stall speed note=flaps down, power off
|never exceed speed kmh=
|never exceed speed mph=
|never exceed speed kts=
|never exceed speed note=
|range miles=1448
|range note=with maximum payload
|ferry range miles=1544
|ferry range note=with maximum fuel
|endurance=<!-- if range unknown -->
|ceiling ft=31,000
|ceiling note=service
|g limits=<!-- aerobatic -->
|roll rate=<!-- aerobatic -->
|glide ratio=<!-- sailplanes -->
|climb rate ms=17.8
|climb rate note= at sea level at weight of 5,182 lb (2,350 kg)
|time to altitude=
|wing loading kg/m2=244.1
|wing loading note=
|power/mass=0.093 shp/lb (0.150 kW/kg)
|more performance=
*'''Take-off distance to clear 50 ft (15 m):''' 2,376 ft (724 m)
*'''Landing distance from 50 ft (15 m):''' 2,498 ft (761 m)
|avionics=
*Collins nav/com, ADF, transponder
*Texas Instruments TI-9100C [LORAN](/source/LORAN)
*Full blind flying instrumentation
}}

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{{aircontent
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|see also=
|related=<!-- related developments -->
|similar aircraft=<!-- similar or comparable aircraft -->
|lists=<!-- related lists -->
}}

==References==
<references>

<ref name=JAWA85>{{cite book |title= Jane's All the World's Aircraft 1985-1986|last= Taylor|first= John W. R. |year=1985|publisher= Jane's Information Group|location= London|isbn=0710608217|page=518}}</ref>

<ref name=aerofiles>{{cite web |url=http://www.aerofiles.com/_sk.html|title=Aerofiles-Smith XP-99 Prop-Jet |access-date=10 October 2012}}</ref>

</references>
<!-- ==Further reading== -->

==External links==
*[http://www.ae.illinois.edu/m-selig/ads/afplots/naca23012.gif NACA 23012 airfoil]
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Category:1980s United States business aircraft
Category:Single-engined turboprop aircraft
Category:Single-engined tractor aircraft
Category:Aircraft first flown in 1982

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Adapted from the Wikipedia article [Smith XP-99 Prop-Jet](https://en.wikipedia.org/wiki/Smith_XP-99_Prop-Jet) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Smith_XP-99_Prop-Jet?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.