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词条 US Aviation Cumulus
释义

  1. Design and development

  2. Specifications (Cumulus)

  3. See also

  4. References

  5. External links

name=Cumulus image= caption=

}}{{Infobox Aircraft Type

 type=Motor glider national origin=United States manufacturer=US Aviation designer=Dave Ekstrom first flight=1995 introduced=1995 retired= status=Production completed primary user= more users= produced= number built=5 (Dec 2011)[1] program cost= unit cost= US$7,995 (without engine or instruments, 2011) developed from= US Aviation Cloud Dancer variants with their own articles=
}}

The US Aviation Cumulus is an American low-wing, single-seat, open cockpit motor glider that was designed by Dave Ekstrom and produced by US Aviation, supplied in kit form for amateur construction.[1][2][3][4][5][6]

Design and development

The Cumulus was conceived as a lightweight motorglider for soaring and also for touring. It is a development of the earlier US Aviation Cloud Dancer design. The aircraft production was outsourced, initially produced by AeroDreams it was later produced by Dave Ekstrom for US Aviation after 2004. The Cumulus first flew in 1995 and was named after the cumulus cloud.[2][5][6]

Built from steel tubing, composites and fabric, the Cumulus is powered by a standard Rotax 447 {{convert|40|hp|kW|0|abbr=on}} engine in pusher configuration, although engines from {{convert|20|to|55|hp|kW|0|abbr=on}} can be fitted. The wings are detachable for transport or storage. It has a glide ratio of 20:1. The landing gear is conventional and the cruciform tail is strut-braced.[2][3][4][5]

Construction time from the kit is estimated at 200 hours.[4]

Specifications (Cumulus)

{{Aircraft specs
|ref=Purdy and KitPlanes[3][4][5]
|prime units?=imp


|genhide=
|crew=
|capacity=
|length m=
|length ft=20
|length in=0
|length note=
|span m=
|span ft=43
|span in=0
|span note=
|height m=
|height ft=4
|height in=6
|height note=
|wing area sqm=
|wing area sqft=141
|wing area note=
|aspect ratio=13:1
|airfoil=
|empty weight kg=
|empty weight lb=320
|empty weight note=
|gross weight kg=
|gross weight lb=560
|gross weight note=
|fuel capacity={{convert|5|u.s.gal}}
|more general=


|eng1 number=1
|eng1 name=Rotax 447
|eng1 type=twin cylinder, two-stroke aircraft engine
|eng1 kw=
|eng1 hp=40
|prop blade number=
|prop name=
|prop dia m=
|prop dia ft=
|prop dia in=
|prop note=


|perfhide=
|max speed kmh=
|max speed mph=85
|max speed kts=
|max speed note=
|cruise speed kmh=
|cruise speed mph=75
|cruise speed kts=
|cruise speed note=
|stall speed kmh=
|stall speed mph=32
|stall speed kts=
|stall speed note=in landing configuration
|never exceed speed kmh=144
|never exceed speed mph=
|never exceed speed kts=
|never exceed speed note=
|range km=
|range miles=275
|range nmi=
|range note=
|endurance=
|ceiling m=
|ceiling ft=15000
|ceiling note=
|g limits=
|roll rate=
|glide ratio=20:1 at {{convert|34|mph|km/h|0|abbr=on}}
|climb rate ms=
|climb rate ftmin=800
|climb rate note=
|sink rate ms=
|sink rate ftmin=195
|sink rate note= at {{convert|43|mph|km/h|0|abbr=on}}
|lift to drag=
|wing loading kg/m2=
|wing loading lb/sqft=
|wing loading note=
|more performance=
|avionics=
}}

See also

{{aircontent
|see also=
  • List of gliders

|related=
|similar aircraft=
  • EEL ULF 2

|lists=
}}

References

1. ^1 Vandermeullen, Richard: 2011 Kit Aircraft Buyer's Guide, Kitplanes, Volume 28, Number 12, December 2011, page 73. Belvoir Publications. {{ISSN|0891-1851}}
2. ^1 2 Bertrand, Noel; Rene Coulon; et al: World Directory of Leisure Aviation 2003-04, page 59. Pagefast Ltd, Lancaster OK, 2003. {{ISSN|1368-485X}}
3. ^1 2 Purdy, Don: AeroCrafter - Homebuilt Aircraft Sourcebook, page 314. BAI Communications. {{ISBN|0-9636409-4-1}}
4. ^1 2 3 Downey, Julia: 2008 Kit Aircraft Directory, Kitplanes, Volume 24, Number 12, December 2007, page 77. Primedia Publications. {{ISSN|0891-1851}}
5. ^1 2 3 Downey, Julia: 1999 Kit Aircraft Directory, Kitplanes, Volume 15, Number 12, December 1998, page 74. Primedia Publications. {{ISSN|0891-1851}}
6. ^1 Bayerl, Robby; Martin Berkemeier; et al: World Directory of Leisure Aviation 2011-12, page 138. WDLA UK, Lancaster UK, 2011. {{ISSN|1368-485X}}

External links

  • [https://web.archive.org/web//ultralightsoaringaviation.com Company website archives] on Archive.org
  • Photo of Cumulus in flight
  • Photo of Cumulus in flight
{{US Aviation aircraft}}

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