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{{Short description|German two-stroke aircraft engine}}
{{Use dmy dates|date=January 2022}}
{{Use British English|date=January 2022}}
<!-- This article is a part of [[Wikipedia:WikiProject Aircraft]]. Please see [[Wikipedia:WikiProject Aircraft/page content]] for recommended layout. -->
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{|{{Infobox Aircraft Begin
{|{{Infobox Aircraft Begin
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| caption=
| caption=
}}{{Infobox Aircraft Engine
}}{{Infobox Aircraft Engine
|type=Twin cylinder [[two-stroke]] [[aircraft engine]]
|type=Twin-cylinder [[two-stroke]] [[aircraft engine]]
|manufacturer=[[Hirth]]
|manufacturer=[[Hirth]]
|national origin=[[Germany]]
|national origin=[[Germany]]
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|produced=April 2008 - present (3502)
|produced=April 2008 - present (3502)
|number built=
|number built=
|program cost=
|unit cost=[[United States dollar|US$]]5988 (3503 model - base price 2009)
|developed from=
|developed from=
|variants with their own articles=
|variants with their own articles=
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|}
|}


The '''Hirth 3502''' and '''3503''' are a family of liquid-cooled, [[Inline engine (aviation)|in-line]] twin cylinder, [[two stroke]], [[carburetor|carbureted]] aircraft engines, with optional [[fuel injection]], designed for use on [[ultralight aircraft]] and small [[homebuilt aircraft|homebuilts]].<ref name="Hirth3502"> {{cite web|url = http://www.recpower.com/3502.htm|title = 3502 water cooled 2 cycle 60hp |accessdate = 2009-12-22|last = Recreational Power Engineering |authorlink = |year = undated}}</ref><ref name="Hirth3503"> {{cite web|url = http://www.recpower.com/3503.htm|title = 3503 water cooled 2 cycle 70hp |accessdate = 2009-12-22|last = Recreational Power Engineering |authorlink = |year = undated}}</ref>
The '''Hirth 3502''' and '''3503''' are a family of liquid-cooled, [[Inline engine (aviation)|in-line]] twin-cylinder, [[two-stroke]], [[carburetor|carbureted]] aircraft engines, with optional [[fuel injection]], designed for use on [[ultralight aircraft]] and small [[homebuilt aircraft|homebuilts]]. It is manufactured by [[Hirth]] of Germany.<ref name="Hirth3502">{{cite web|url = http://www.recpower.com/3502%20water%20cooled%202%20cycle%2060hp.htm|title = 3502 water-cooled 2-cycle 60&nbsp;hp |accessdate = 17 January 2012|last = Recreational Power Engineering |authorlink = |year = n.d.}}</ref><ref name="Hirth3503">{{cite web|url = http://www.recpower.com/3503%20water%20cooled%202%20cycle%2070hp.htm|title = 3503 water-cooled 2-cycle 70&nbsp;hp |accessdate = 17 January 2012|last = Recreational Power Engineering |authorlink = |year = n.d.}}</ref>


==Development==
==Development==
The engines were developed as competitors to the {{convert|64|hp|kW|0|abbr=on}} [[Rotax 582]] with an identical mounting bolt pattern to the 582, allowing either to be a drop-in replacement. The engines are similar to the [[Rotax]] powerplant in being liquid-cooled, two-cylinder in-line engines, with dual [[capacitor discharge ignition]]. The 3502 was developed from the 3503 as a de-rated version and produces {{convert|60|hp|kW|0|abbr=on}}, in comparison to the 3503's {{convert|70|hp|kW|0|abbr=on}}. Both engines have the same bore, stroke and compression ratio as the three cylinder in-line liquid-cooled [[Hirth 3701]] and the bore, stroke, compression ratio and displacement of the twin-cylinder [[Hirth 2704]] and [[Hirth 2706]].<ref name="Hirth3502" /><ref name="Hirth3503" /><ref name="Hirth3701"> {{cite web|url = http://www.recpower.com/3701.htm|title = 3701S - 2 cycle 100hp |accessdate = 2009-12-18|last = Recreational Power Engineering |authorlink = |year = undated}}</ref><ref name="ULN"> {{cite web|url = http://www.ultraligero.net/Descargas/Manuales/Hirth/3701_2cycle_100Hp.htm|title = 3701 - 2 cycle - 100hp |accessdate = 2009-12-18|last = Ultraligero.Net |authorlink = |year = undated}}</ref>
The engines were developed as competitors to the {{convert|64|hp|kW|0|abbr=on}} [[Rotax 582]] with an identical mounting bolt pattern to the 582, allowing either to be a drop-in replacement. The engines are similar to the [[Rotax]] powerplant in being liquid-cooled, two-cylinder in-line engines, with dual [[capacitor discharge ignition]]. The 3502 was developed from the 3503 as a de-rated version and produces {{convert|60|hp|kW|0|abbr=on}}, in comparison to the 3503's {{convert|70|hp|kW|0|abbr=on}}. Both engines have the same bore, stroke and compression ratio as the three-cylinder in-line liquid-cooled [[Hirth 3701]] and the bore, stroke, compression ratio and displacement of the twin-cylinder [[Hirth 2704]] and [[Hirth 2706]].<ref name="Hirth3502" /><ref name="Hirth3503" /><ref name="Hirth3701">{{cite web|url = http://www.recpower.com/3701.htm|title = 3701S - 2 cycle 100hp|accessdate = 2009-12-18|last = Recreational Power Engineering|authorlink = |year = n.d.|archive-url = https://web.archive.org/web/20060311024349/http://www.recpower.com/3701.htm|archive-date = 2006-03-11|url-status = dead}}</ref><ref name="ULN">{{cite web|url = http://www.ultraligero.net/Descargas/Manuales/Hirth/3701_2cycle_100Hp.htm|title = 3701 - 2 cycle - 100hp |accessdate = 2009-12-18|last = Ultraligero.Net |authorlink = |year = n.d.}}</ref>


Both the 3502 and 3503 are equipped with dual Bing 34 mm slide carburetors or optionally electronic fuel injection. The cylinder walls are electrochemically coated with [[Nikasil]] and the crankshaft is forged from [[4130 steel]]. Standard starting is [[recoil start]] with electric start as an option. The reduction drive system available is the G-50 gearbox, with reduction ratios of 2.16:1, 2.29:1, 2.59:1, 3.16:1, or 3.65:1.<ref name="Hirth3502" /><ref name="Hirth3503" />
Both the 3502 and 3503 are equipped with dual Bing 34&nbsp;mm slide carburetors or optionally electronic fuel injection. The cylinder walls are electrochemically coated with [[Nikasil]] and the crankshaft is forged from [[4130 steel]]. Standard starting is [[recoil start]] with electric start as an option. The reduction drive system available is the G-50 gearbox, with reduction ratios of 2.16:1, 2.29:1, 2.59:1, 3.16:1, or 3.65:1.<ref name="Hirth3502" /><ref name="Hirth3503" />


The engines run on a 50:1 pre-mix of [[Avgas#Automotive_gasoline|unleaded 93 octane auto fuel]] and oil, or optionally oil injection.<ref name="Hirth3502" /><ref name="Hirth3503" />
The engines run on a 50:1 pre-mix of [[Avgas#Automotive gasoline|unleaded 93 octane auto fuel]] and oil, or optionally oil injection.<ref name="Hirth3502" /><ref name="Hirth3503" />


==Variants==
==Variants==
;3502
;3502
:Twin-cylinder in-line, liquid-cooled, two stroke aircraft engine with dual Bing 34mm slide carburetors or fuel injection. Produces {{convert|60|hp|kW|0|abbr=on}} at 5000 rpm and has a factory rated [[Time between overhaul|TBO]] of 1200 hours. In production since April 2008.<ref name="Hirth3502" />
:Twin-cylinder in-line, liquid-cooled, two-stroke aircraft engine with dual Bing 34&nbsp;mm slide carburetors or fuel injection. Produces {{convert|60|hp|kW|0|abbr=on}} at 5000&nbsp;rpm and has a factory rated [[Time between overhaul|TBO]] of 1200 hours. In production since April 2008.<ref name="Hirth3502" />
;3503
;3503
:Twin-cylinder in-line, liquid-cooled, two stroke aircraft engine with dual Bing 34mm slide carburetors or fuel injection. Produces {{convert|70|hp|kW|0|abbr=on}} at 6500 rpm and has a factory rated TBO of 1000 hours. In production.<ref name="Hirth3503" />
:Twin-cylinder in-line, liquid-cooled, two-stroke aircraft engine with dual Bing 34&nbsp;mm slide carburetors or fuel injection. Produces {{convert|70|hp|kW|0|abbr=on}} at 6500&nbsp;rpm and has a factory rated TBO of 1000 hours. In production.<ref name="Hirth3503" />
<!-- ==Operational history== -->
<!-- ==Operational history== -->


==Applications==
==Applications==
;3502
;3203
*[[Fresh Breeze XCitor]] - [[powered parachute]]<ref name="FreshBreeze"> {{cite web|url = http://www.fresh-breeze.de/en/products/trikes/xcitor.html|title = XCitor|accessdate = 2009-12-15|last = Fresh Breeze Powered paraglider|authorlink = |year = undated}}</ref>
*[[CGS Hawk|CGS Hawk Arrow II]]<ref name="Arrow">{{cite web|url = http://homepage.mac.com/sbensinger/PhotoAlbum21.html|title = Hawks at Sun N Fun 2005|accessdate = 2009-12-22|last = Singer|first = S. Ben|authorlink = |date = April 2005|archive-url = https://web.archive.org/web/20090804060505/http://homepage.mac.com/sbensinger/PhotoAlbum21.html|archive-date = 2009-08-04|url-status = dead}}</ref>
⚫
*[[Fresh Breeze XCitor]] - [[powered parachute]]<ref name="FreshBreeze">{{cite web|url = http://www.fresh-breeze.de/en/products/trikes/xcitor.html|title = XCitor|accessdate = 2009-12-22|last = Fresh Breeze Powered paraglider|authorlink = |year = n.d.}}</ref>
*[[Paraski]] - powered parachute
*[[Paraski]] - powered parachute
;3503
⚫
*[[Steelbreeze]] - powered parachute<ref name="SteelBreeze"> {{cite web|url = http://www.steelbreeze.ca/Hirth3503.htm|title = Hirth 3503|accessdate = 2009-12-22|last = Steelbreeze |authorlink = |year = 2005}}</ref>
*[[Excalibur Aircraft Excalibur]]
*[[GyroTec DF02]]
*[[Rotortec Cloud Dancer Light]]
*[[Summit Steel Breeze]] - powered parachute<ref name="SteelBreeze">{{cite web|url = http://www.steelbreeze.ca/Hirth3503.htm|title = Hirth 3503|accessdate = 2009-12-22|last = Steelbreeze|authorlink = |year = 2005|archive-url = https://web.archive.org/web/20110706203809/http://www.steelbreeze.ca/Hirth3503.htm|archive-date = 2011-07-06|url-status = dead}}</ref>
*[[Vortech Skylark]] - helicopter


==Specifications (3503) ==
==Specifications (3503) ==
{{pistonspecs|
{{pistonspecs|
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|ref=Recreational Power Engineering<ref name="Hirth3503" />
|ref=Recreational Power Engineering<ref name="Hirth3503" />
|type=Twin cylinder, two-stroke, in-line, aircraft engine
|type=Twin-cylinder, two-stroke, in-line, aircraft engine
|bore={{convert|76|mm|in|1|abbr=on}}
|bore={{convert|76|mm|in|1|abbr=on}}
|stroke={{convert|69|mm|in|1|abbr=on}}
|stroke={{convert|69|mm|in|1|abbr=on}}
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|supercharger=
|supercharger=
|turbocharger=
|turbocharger=
|fuelsystem=2 X Bing 34mm slide type carburetors or fuel injection
|fuelsystem=2 X Bing 34&nbsp;mm slide type carburetors or fuel injection
|fueltype=[[Avgas#Automotive_gasoline|unleaded 93 octane auto fuel]]
|fueltype=[[Avgas#Automotive gasoline|unleaded 93 octane auto fuel]]
|oilsystem=50:1 fuel/oil premix or oil injection
|oilsystem=50:1 fuel/oil premix or oil injection
|coolingsystem=liquid
|coolingsystem=liquid
|power={{convert|70|hp|kW|0|abbr=on}} at 6500 rpm
|power={{convert|70|hp|kW|0|abbr=on}} at 6500&nbsp;rpm
|specpower=
|specpower=
|compression=9.5:1
|compression=9.5:1
Line 69: Line 76:
|oilcon=
|oilcon=
|power/weight=
|power/weight=

|designer=
|designer=
|reduction_gear= G-50 gearbox with reduction ratios of 2.16:1, 2.29:1, 2.59:1, 3.16:1, or 3.65:1 or cog-belt
|reduction_gear= G-50 gearbox with reduction ratios of 2.16:1, 2.29:1, 2.59:1, 3.16:1, or 3.65:1 or cog-belt

|general_other=
|general_other=
|components_other=
|components_other=
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==References==
==References==
{{Reflist}}
{{Reflist}}

==External links==
==External links==
*[http://www.recpower.com/3502.htm Official 3502 page]
*[http://www.recpower.com/3502%20water%20cooled%202%20cycle%2060hp.htm Official 3502 page]
*[http://www.recpower.com/3503.htm Official 3503 page]
*[http://www.recpower.com/3503%20water%20cooled%202%20cycle%2070hp.htm Official 3503 page]


{{Hirth aeroengines}}
{{Hirth aeroengines}}
[[Category:Hirth aircraft engines]]
{{Aviation lists}}

[[Category:Two-stroke aircraft piston engines]]
[[Category:Two-stroke aircraft piston engines]]

Latest revision as of 22:11, 24 September 2024

Hirth 3502 & 3503
Type Twin-cylinder two-stroke aircraft engine
National origin Germany
Manufacturer Hirth
Produced April 2008 - present (3502)

The Hirth 3502 and 3503 are a family of liquid-cooled, in-line twin-cylinder, two-stroke, carbureted aircraft engines, with optional fuel injection, designed for use on ultralight aircraft and small homebuilts. It is manufactured by Hirth of Germany.[1][2]

Development

[edit]

The engines were developed as competitors to the 64 hp (48 kW) Rotax 582 with an identical mounting bolt pattern to the 582, allowing either to be a drop-in replacement. The engines are similar to the Rotax powerplant in being liquid-cooled, two-cylinder in-line engines, with dual capacitor discharge ignition. The 3502 was developed from the 3503 as a de-rated version and produces 60 hp (45 kW), in comparison to the 3503's 70 hp (52 kW). Both engines have the same bore, stroke and compression ratio as the three-cylinder in-line liquid-cooled Hirth 3701 and the bore, stroke, compression ratio and displacement of the twin-cylinder Hirth 2704 and Hirth 2706.[1][2][3][4]

Both the 3502 and 3503 are equipped with dual Bing 34 mm slide carburetors or optionally electronic fuel injection. The cylinder walls are electrochemically coated with Nikasil and the crankshaft is forged from 4130 steel. Standard starting is recoil start with electric start as an option. The reduction drive system available is the G-50 gearbox, with reduction ratios of 2.16:1, 2.29:1, 2.59:1, 3.16:1, or 3.65:1.[1][2]

The engines run on a 50:1 pre-mix of unleaded 93 octane auto fuel and oil, or optionally oil injection.[1][2]

Variants

[edit]
3502
Twin-cylinder in-line, liquid-cooled, two-stroke aircraft engine with dual Bing 34 mm slide carburetors or fuel injection. Produces 60 hp (45 kW) at 5000 rpm and has a factory rated TBO of 1200 hours. In production since April 2008.[1]
3503
Twin-cylinder in-line, liquid-cooled, two-stroke aircraft engine with dual Bing 34 mm slide carburetors or fuel injection. Produces 70 hp (52 kW) at 6500 rpm and has a factory rated TBO of 1000 hours. In production.[2]

Applications

[edit]
3502
3503

Specifications (3503)

[edit]

Data from Recreational Power Engineering[2]

General characteristics

  • Type: Twin-cylinder, two-stroke, in-line, aircraft engine
  • Bore: 76 mm (3.0 in)
  • Stroke: 69 mm (2.7 in)
  • Displacement: 625 cc (38.1 cu in)
  • Length: 398 mm (15.7 in)
  • Width: 368 mm (14.5 in)
  • Height: 419 mm (16.5 in)
  • Dry weight: 79 lb (35.8 kg) without radiator & coolant. The G-50 gearbox adds an additional 19 lb (8.6 kg)

Components

  • Fuel system: 2 X Bing 34 mm slide type carburetors or fuel injection
  • Fuel type: unleaded 93 octane auto fuel
  • Oil system: 50:1 fuel/oil premix or oil injection
  • Cooling system: liquid
  • Reduction gear: G-50 gearbox with reduction ratios of 2.16:1, 2.29:1, 2.59:1, 3.16:1, or 3.65:1 or cog-belt

Performance

References

[edit]
  1. ^ a b c d e Recreational Power Engineering (n.d.). "3502 water-cooled 2-cycle 60 hp". Retrieved 17 January 2012.{{cite web}}: CS1 maint: year (link)
  2. ^ a b c d e f Recreational Power Engineering (n.d.). "3503 water-cooled 2-cycle 70 hp". Retrieved 17 January 2012.{{cite web}}: CS1 maint: year (link)
  3. ^ Recreational Power Engineering (n.d.). "3701S - 2 cycle 100hp". Archived from the original on 11 March 2006. Retrieved 18 December 2009.{{cite web}}: CS1 maint: year (link)
  4. ^ Ultraligero.Net (n.d.). "3701 - 2 cycle - 100hp". Retrieved 18 December 2009.{{cite web}}: CS1 maint: year (link)
  5. ^ Singer, S. Ben (April 2005). "Hawks at Sun N Fun 2005". Archived from the original on 4 August 2009. Retrieved 22 December 2009.
  6. ^ Fresh Breeze Powered paraglider (n.d.). "XCitor". Retrieved 22 December 2009.{{cite web}}: CS1 maint: year (link)
  7. ^ Steelbreeze (2005). "Hirth 3503". Archived from the original on 6 July 2011. Retrieved 22 December 2009.
[edit]
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