zeus45601(at)yahoo.com
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 Posted: Fri Mar 19, 2010 2:33 am Post subject: Request Info on Jabiru and the Airmaster 420 Constant Speed |
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Good stuff. Thanks for the data and pics.
From: Jérôme Delamare <jeromedelamare(at)free.fr>
To: jabiruengine-list(at)matronics.com
Sent: Fri, March 19, 2010 3:27:40 AM
Subject: RE: Request Info on Jabiru and the Airmaster 420 Constant Speed Propeller
Jay,
Would you like to be a flight tester ?
With this combination, you will be the flight tester for :
- Jabiru engine (each engine is different…)
- Air master for Jabiru (how many propellers did they produced for a Jabiru 2200 ?)
- The combination of the Jabiru 2200 and the airmaster. (resonances, oscillating torque, inertia…)
I’ve already been in a similar position (early hydraulic lifter engine + Silence Aircraft in flight adjustable propeller). The result of resonances (and poor engineering from Silence Aircraft) :
http://jeromedelamare.free.fr/Vprop/index.html
The blade split in two part during initial climb (120 ft)  ((
Of course, Air master is a well known company and can’t be compared to Silence Aircraft, but, be careful.
The only one regret of the in flight adjustable propeller : the additional drag during landing.
The propeller of my MCR is fitted for economic cruise speed at 120 kts and 3000 rpm (less than 4 gal/hour). Even so, I can take off and land on a 150 m (500 ft) runway and climb at 1600 ft/min.
Jérôme
From: owner-jabiruengine-list-server(at)matronics.com [mailto:owner-jabiruengine-list-server(at)matronics.com] On Behalf Of Jay Parker
Sent: jeudi 18 mars 2010 15:19
To: zenith750-list(at)matronics.com; jabiruengine-list(at)matronics.com
Subject: Request Info on Jabiru and the Airmaster 420 Constant Speed Propeller
Does anyone here have any data regarding the use of using an Airmaster AP420 http://www.airmasterpropellers.com/wab487.html with the Jabiru engine preferably using the smaller 2200 on a Zenith CH-750 or comparable sized plane? I’m wondering if the Jabiru 2200 /w 85HP and Airmaster would show noticeable improvements in average cruise speed, climb, takeoff, to handle as well as the aircraft just fitted with a Jabiru 3300 with no constant speed prop, power-wise. I’m a little reluctant to use a smaller engine under 100 HP on the Zenith CH-750 even though Zenith says it will fly with engines with horsepowers in the range of 80 to 125 HP, but I would consider the 85HP Jabiru 2200 if it were fitted with an Airmaster AP420 if Constant Speed propeller if I could be shown to get the economy of a 4 stroke (4gals/hr) engine, with the assurance of no sluggish handlings on take-off or climbs. I was told I would have to register such a plane with an Airmaster as an Experimental-LSA as opposed to just an Amateur Built-LSA. I’m not certain of the repercussions, cons or pros of registering a plane one way or another, but for the sack of fuel economy and dependable power when needed, I’m toying with this idea of a CH-750 with a Jab 2200 engine and an Airmaster AP420 Constant Speed Propeller combo. I would appreciate any word, rumors etc on this topic and realize that such a combo would be rare here in the States, but may not be unusual in Australia, New Zealand or Tasmania since both the Jabiru and Airmaster are products of that region.
Jay Parker
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