Grob G 109
The Grob G 109 is a two-seat touring motor glider with variable pitch of the Grob Aircraft AG Mindelheim in Swabia.
The aircraft is now no longer prepared consists of modern composite materials (GRP), which provide a high surface quality. Development began in 1979 and culminated in 1981 initially in the type certification of the coarse G109A. Current type support is based at the airfield Mainbullau LTB Korff.
Grob G 109A
In the absence of cost-effective and high-performance engines, a 2000 cc Limbach- flight engine was installed in this model, which developed an output of 80 hp at an engine speed of 3400 rpm. Due to the variable pitch used, the maximum speed was limited to 3200 rpm, which additionally robbed performance. The G 109A was just as her successor Grob G 109B standard with a 160 - cm -Hoffmann - pitch propeller, which has three positions: takeoff, cruise and sailing.
The wingspan is 16.6 m. The maximum speed ( VNE ) of 240 km / h cruising speed is 170 km / h while about 15 liters of Super per hour are consumed. The tank holds 80 liters.
Due to the low engine power to weight ratio, the climb performance were moderately especially in rain and high temperatures. Therefore, the successor G 109B was equipped with a self- developed rough engine with an output of 87 hp.
Nevertheless, the G 109A was popular with its pilots, because as at that time the most modern aircraft in its class combined high level of comfort with relatively good gliding properties and good maneuverability.
About 30 G 109A were later equipped with the 87 hp 2400 cc Limbach aircraft engine and with a modern, electrically controlled Constant -speed variable-pitch propeller MTV -1-A / L of the company Mühlbauer. The combination of new engine and propeller, the pattern was awarded the Blue Angel for particularly low noise emission, this fell from 65.9 dB ( A) to 61.3 dB ( A). This version was in a collaboration between the Air sports clubs Babenhausen with the aviation workshop Korff / Dietz Bach (now Mainbullau ) developed and airworthiness approval by the Federal Aviation Authority. Also, at least two conversions on Rotax 912 and at least one conversion to an aircraft engine Sauer ST 2500 H1S with 68 kW ( 92 hp ) are documented.
The first two machines of the Grob G 109 ( Plant No. 6001 and 6010 ) were delivered with a wingspan of only 15.50 m. The first ( WerkNr.: 6001 prototype ) probably flies in Norway and the second ( 6010 ) is approved with the registration D - KAMB in Germany and currently at the airfield Kamp- Lintfort ( EDLC ) home. A total of 151 G 109A were made .
Grob G 109B
Built in 1983 and published now also no longer manufactured aircraft was specially developed for this pattern of coarse motor ' rough 2500 E1' with an output of 87 hp at an engine speed of 3000 rpm. The span is 17.4 m. The maximum speed ( VNE ) of 240 km / h cruising speed is 170 km / h while about 15 liters of Super per hour are consumed. The minimum consumption is with the standard coarse - engine at 12 l / h, the tank volume is 100 liters (72 kg).
Compared to the predecessor model G 109A, the B version differs optically mainly by pivoting upward wing doors, the small side window in the footwell in front of the wings and their slightly increased wingspan.
Other features are the Fußspitzenbremsen on the rudder pedals through which each wheel of the main landing gear can be braked independently of the position of the rudder. This ground handling has been significantly improved.
Similarly, the climb performance could be improved by the more powerful engine, the left to be desired in the A version with the 2000 cc Limbach engine especially in the rain left.
The G 109B was just like the A version equipped as standard with a 160 - cm -Hoffmann - pitch propeller, which has three positions: takeoff, cruise and sailing.
Grob G 109B equipped the with a standard folding mechanism for the wings, so that they could be folded up against the trunk in the hall before setting to always save critical space in the hangar. This design also received automatic aileron connectors so that the fast and secure way goes from the hand up and teardown.
Overall, the B version is to be regarded as a successful development, even if it does not have the original maneuverability of the A version.
As of 2001, the company Limbach and an electrically driven variable pitch ( constant speed ) were fitted by the pattern carers about 30 G 109B with a 130 - horsepower turbocharged engine, which significantly improved the flight performance in powered flight. With reinforced hull that version is used for cost of towing gliders. Consumption is then about 25 l / h, which is about half of what conventional towing aircraft with Lycoming or Continental - blowing works consume. Total C 109B were 325 produced.