# NAC Fieldmaster
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{{Use dmy dates|date=February 2018}}
{{Use British English|date=February 2018}}
{{Infobox aircraft
| name = Fieldmaster
| logo =
| logo_size =
| image = Norman NDN-6 Fieldmaster AN2337048.jpg
| alt =
| caption = The prototype Fieldmaster at the [1984 Farnborough airshow](/source/1984_Farnborough_airshow), 9 September 1984
| long_caption =
| other_names =
| aircraft_type = Agricultural Aircraft
| aim =
| outcome =
| related =
| national_origin = [United Kingdom](/source/United_Kingdom)
| manufacturer = NDN Aircraft
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| service =
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| prototypes =
| number_built = 10
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| retired =
| first_flight = 17 December 1981
| initiated =
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}}
The '''NAC Fieldmaster''' was a British agricultural aircraft of the 1980s. A [turboprop](/source/turboprop) powered single-engined monoplane, it was built in small numbers and used both as a cropsprayer and a firefighting aircraft.
==Development and design==
NDN Aircraft was set up in 1976 by [Desmond Norman](/source/Desmond_Norman) to build the [Firecracker](/source/NDN_Firecracker) trainer. Norman had been a founder of the Britten-Norman company, the manufacturers of the [Islander](/source/Britten-Norman_Islander). NDN Aircraft designed a new agricultural aircraft, the '''NDN-6 Fieldmaster.''' This was a large single-engined low-winged monoplane with a fixed tricycle undercarriage, powered by a [Pratt & Whitney Canada PT6](/source/Pratt_%26_Whitney_Canada_PT6) [turboprop](/source/turboprop) engine, the first western-built agricultural aircraft to be designed for turboprop power.[{{cite magazine |last1=Barnett |first1=Cliff |title=Enter the Fieldmaster |magazine=Flight International |date=30 August 1980 |volume=118 |issue=3721 |page=800 |url=http://www.flightglobal.com/pdfarchive/view/1980/1980%20-%202439.html |access-date=30 March 2019 |issn=0015-3710 |archive-url=https://web.archive.org/web/20190330170210/https://www.flightglobal.com/pdfarchive/view/1980/1980%20-%202439.html |archive-date=30 March 2019}}] Novel features included an integral hopper made of [Titanium](/source/Titanium) to carry its chemical payload, which was dispersed via spray nozzles built into the [flaps](/source/Flap_(aircraft)) under the aircraft's wings.[{{cite magazine |last1=Barnett |first1=Cliff |title=NDN Fieldmaster |magazine=Flight International |date=29 August 1981 |pages=649–652 |url=http://www.flightglobal.com/pdfarchive/view/1981/1981%20-%202839.html |access-date=30 March 2019 |issue=3773 |issn=0015-3710}}]
The first prototype flew on 17 December 1981 at NDN's airfield at [Sandown](/source/Sandown), [Isle of Wight](/source/Isle_of_Wight). TNDN moved the premises to [Cardiff](/source/Cardiff_International_Airport), [Wales](/source/Wales) in 1985, renaming itself the Norman Aeroplane Company (NAC). Production finally started in 1987.[ It was intended that parts would be produced by [UTVA](/source/Lola_Utva) in [Pančevo](/source/Pan%C4%8Devo), [Yugoslavia](/source/Yugoslavia) (now in [Serbia](/source/Serbia)) to be assembled in Cardiff.][{{cite magazine |title=Jugoslavs will build Fieldmaster |magazine=Flight International |date=19 March 1988 |volume=133 |issue=4105 |page=12 |url=https://www.flightglobal.com/pdfarchive/view/1988/1988%20-%200648.html |access-date=30 March 2019 |issn=0015-3710 |archive-url=https://web.archive.org/web/20190330143532/https://www.flightglobal.com/pdfarchive/view/1988/1988%20-%200648.html |archive-date=30 March 2019}}]
NAC went into receivership in 1988, after the production of six Fieldmasters, including the prototype.[{{cite magazine |title=Norman calls in receiver |magazine=[Flight International](/source/Flight_International) |date=6 August 1988 |volume=134 |issue=4125 |page=11 |url=http://www.flightglobal.com/pdfarchive/view/1988/1988%20-%202031.html |access-date=30 March 2019 |issn=0015-3710 |archive-url=https://web.archive.org/web/20190330170203/https://www.flightglobal.com/pdfarchive/view/1988/1988%20-%202031.html |archive-date=30 March 2019}}] Brooklands Aerospace attempted to continue production, rebuilding one of the Fieldmasters with a more powerful engine as a specialised firefighting aircraft as the '''Firemaster 65''',[{{cite magazine |title=Uprated Fieldmaster makes first flight |magazine=Flight International |date=6 December 1989 |volume=136 |issue= 4194 |page=21 |url=http://www.flightglobal.com/pdfarchive/view/1989/1989%20-%203793.html |access-date=30 March 2019 |issn=0015-3710 |archive-url=https://web.archive.org/web/20190330170217/https://www.flightglobal.com/pdfarchive/view/1989/1989%20-%203793.html |archive-date=30 March 2019}}] but these attempts were stopped by the [outbreak of civil war in Yugoslavia](/source/Yugoslav_wars).[{{cite book |last1=Donald |first1=David |title=The encyclopedia of world aircraft |publisher=Blitz Editions |isbn=185605375X |page=673 |edition=Updated|year=1997 }}]
A final attempt at production was made by the [Turkish Aeronautical Association](/source/Turkish_Aeronautical_Association) (''Türk Hava Kurumu'' – THK) who started licensed production in 1997. This ended in 1999 after completion of two complete aircraft and a further two airframes lacking engines.[{{cite web |last1=Tuncay |first1=Deniz |title=THK : Turkish Aircraft Production |url=http://www.tuncay-deniz.com/ENGLISH/THK/thk.html |website=tuncay-deniz |access-date=30 March 2019}}]
==Variants==
;NDN-6 Fieldmaster:The initial designation for the prototype; one built.
;NAC Fieldmaster: Designation of production aircraft after the formation of the Norman Aeroplane Company (NAC); five built.
;Brooklands Aerospace Firemaster 65:A rebuilt Fieldmaster with more powerful engine and firefighting equipment; one conversion.
;THK-TAYSU: Production in [Turkey](/source/Turkey) by ''[Türk Hava Kurumu](/source/T%C3%BCrk_Hava_Kurumu)'' (THK); four built
==Specifications (NAC 6)==
{{Aircraft specs
|ref=Jane's All the World's Aircraft 1988–89[{{cite book |title=Jane's all the World's Aircraft 1988–89 |year=1988 |publisher=Jane's Information Group |location=London |isbn=0-7106-0867-5 |editor1-last=Taylor |editor1-first=John W.R. |pages=299–300}}]
|prime units?=met
|crew=1
|capacity=optional trainee / ground operator jump seat and/or {{cvt|2032|kg}} dry chemicals or {{cvt|2366|L|USgal impgal}} liquid
|length m=11.02
|span m=16.23
|upper span m=
|mid span m=
|lower span m=
|width m=
|height m=4.12
|wing area sqm=33.25
|aspect ratio=7.96
|airfoil=[NACA 23012](/source/NACA_airfoil)
|empty weight kg=2266
|gross weight kg=
|max takeoff weight kg=4535
|max takeoff weight note=to UK [CAA](/source/Civil_Aviation_Authority_(United_Kingdom)) AN 90
|fuel capacity= Normal {{cvt|757|L|USgal impgal}}; Maximum {{cvt|1490|L|USgal impgal}} (2 x {{cvt|378.5|L|USgal impgal}} main tanks and 2x {{cvt|367|L|USgal impgal}} auxiliary tanks); Oil {{cvt|13|L|USgal impgal}}
|more general=
|eng1 number=1
|eng1 name=[Pratt & Whitney Canada PT6A-34AG](/source/Pratt_%26_Whitney_Canada_PT6A-34AG)
|eng1 type=[turboprop](/source/turboprop)
|eng1 kw=559
|prop blade number=3
|prop name=[Hartzell](/source/Hartzell_Propeller) HC-B3TN-3/T10282+4
|prop dia m=
|prop dia ft=
|prop dia in=
|prop dia note=fully-feathering reversible-pitch metal propeller with spinner
|max speed kmh=265
|max speed note=at sea level
::::{{cvt|265|km/h|mph kn}} at {{cvt|1830|m}}
*'''Design manoeuvring speed:''' {{cvt|233|km/h|mph kn}}
|cruise speed kmh=
|stall speed kmh=129
|stall speed note=flaps up
::::{{cvt|111|km/h|mph kn}} flaps 30°
|never exceed speed kmh=318
|minimum control speed kmh=
|range km=
|range note=
|combat range km=
|ferry range km=1853
|ferry range note=with 2 crew at {{cvt|3050|m}}, with {{cvt|454|kg}} of equipment and max fuel with no reserve
|endurance=
|ceiling m=5547
|g limits=+3 / -1.7
|roll rate=
|climb rate ms=4.883
|time to altitude=
|wing loading kg/m2=136.37
|fuel consumption kg/km=
|power/mass={{cvt|8.11|kg/kW}}
|thrust/weight=
|more performance=
*'''Take-off run to {{cvt|15|m}}:''' {{cvt|419|m}}
*'''Landing run from {{cvt|15|m}}:''' {{cvt|419|m}}
*'''Landing run:''' {{cvt|152|m}} at {{cvt|2720|kg}} with propeller reversal
}}
==See also==
{{Aircontent|
|related=
|similar aircraft=*[PZL-Mielec M-18 Dromader](/source/PZL-Mielec_M-18_Dromader)
*[Air Tractor AT-400](/source/Air_Tractor_AT-400)
|sequence=
|lists=
|see also=
}}
==References==
{{commons category|NAC Fieldmaster}}
{{Reflist}}
==Further reading==
* {{cite magazine |volume=132 |title=Fieldmaster fighter proves its worth |magazine=[Flight International](/source/Flight_International) |access-date=30 March 2019 |issue=4086 |url=https://www.flightglobal.com/pdfarchive/view/1987/1987%20-%202217.html |date=31 October 1987 |issn=0015-3710 |page=15 |archive-url=https://web.archive.org/web/20141226141637/http://www.flightglobal.com/pdfarchive/view/1987/1987%20-%202217.html |archive-date=26 December 2014}}
*{{cite magazine|last1=Blech |first1=Robin |title=Norman's mighty Fieldmaster |magazine=Flight International |date=6 February 1988 |pages=22–26 |url=http://www.flightglobal.com/pdfarchive/view/1988/1988%20-%200286.html |volume=133 |issn=0015-3710 |issue= 4099}}
==External links==
*{{cite web |title=NDN/NORMAN AEROPLANE Co. |url=http://daveg4otu.tripod.com/iowweb/ndn.html |website=ISLE OF WIGHT AVIATION |access-date=30 March 2019 |archive-url=https://web.archive.org/web/20090413050620/http://daveg4otu.tripod.com/iowweb/ndn.html |archive-date=13 April 2009}}
{{Britten-Norman aircraft}}
Category:1980s British agricultural aircraft
Fieldmaster
Category:Single-engined tractor aircraft
Category:Single-engined turboprop aircraft
Category:Low-wing aircraft
Category:Aircraft first flown in 1981
Fieldmaster
---
Adapted from the Wikipedia article [NAC Fieldmaster](https://en.wikipedia.org/wiki/NAC_Fieldmaster) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/NAC_Fieldmaster?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.