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Speed & Zeniths: Jabiru 3300 vs. Corvair in a 601XL

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tya2(at)4-fly.net
Guest

Posted: Tue Aug 01, 2006 8:21 am Post subject: Speed & Zeniths: Jabiru 3300 vs. Corvair in a 601XL

There is one thing consistent with Chris Heinz designs.   They are 

SLOW!   I certainly find that the case with CH2000.   I have the high 

compression 0-235 and this aeroplane is aerodynamic compared to some of his 

designs but it is 90 knots at 2600 RPM and 25 litres an hour at that power 

setting.   I just flew 27 hours going from Nashua NH to NW Alberta so I 

have pretty solid data.   The CH2000 airplane on the same power as a AA-1 

Aircraft is about 10 to 15 mph slower.    The fuel consumption of 25 liters 

an hour works out to 7.5 gph not the 5.5 gph I was led to believe was the 

fuel burn.   I can say that cruising at 2300 rpms the airplane won't 

maintain altitude.



With the price of avgas at $4.60 US a gallon and $1.60 a litre Canadian, 

choice of an engine based upon grade of gas used and fuel flow would be 

wise.   From being a member of the Jabiru list I can see there have been 

issues of over optimism on the power put out by the J2200, certainly engine 

owners spent a great deal of time fiddling with the engine.   Stuff 

lycoming owners weren't required to do.   When choosing an engine think 

about how you will fly the plane.   Short out and returns to home base, or 

long cross countries.  If you are doing lots of out and return an exotic 

engine works.   For long cross country flying you won't have the luxury of 

prowling junk yards or looking for parts when you break down in Podunk 

Nebraska or Armpit Alberta.   Sometimes there is a convenience factor in a 

factory built aircraft engine.   I flew a BD-4 at 170 mph for 1200 hours 

all over North America over 17 years.   I know what out of town break downs 

feel like.   The problem was not the engine in the BD-4.   It was mickey 

mouse tail wheels used a nose wheel and a few other similar such airframe 

parts (broken doors requiring welding) because of poorly designed hinges 

and latches.



The ability to use auto gas is a cost saver when operating from home base 

but the more cross country flying you do will cause you to quickly discover 

the unavailability of avfuels other than 100 LL away from home base.



I consider both the Jabiru 3300 and the Corvair to be exotic engines with 

limited support away from your home field.   I am not saying anything 

negative about their performance or constuction just don't expect to walk 

into a hanger anywhere and buy parts off the shelf. If you sell your plane 

there is the downside of the new owner having a very steep learning curve 

to get up to speed on your engine and its operation and maintenance.   If 

general aviation mechanics are reluctant to work on home built aircraft, 

they are even more reluctant to work on exotic engines.



Good luck in your engine choices



Rocky

CH2000



At 08:32 AM 8/1/2006 -0700, you wrote:

 	  Quote: 	
		  



    Paul, I'm afraid you may be disappointed if you're expecting to get a 

 cruise speed much higher than 125 mph from a Lycoming.  Especially 

 without wheel pants or fairings.  Chris designs great little airplanes, 

 but his numbers are a bit skewed.  All of them, in almost every area, are 

 definitely on the optimistic side (time to build, cruise speed, Load Factor).

    Take some time and check out a few of the builders' web sites for 

 their numbers.  You'll find a few that hit the published numbers, but 

 only after a fair amount of clean up and fairing.

    Tom Henderson

    601XL Fuselage in process

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nfivesl(at)yahoo.com
Guest

Posted: Tue Aug 01, 2006 10:45 am Post subject: Speed & Zeniths: Jabiru 3300 vs. Corvair in a 601XL

Hey now - I was in Podunk, Nebraska yesterday and they

had a fine assortment of aircraft & automobile parts

AND a welding shop.



Scott(DO NOT ARCHIVE)Laughlin

Omaha, Nebraska

http://www.cooknwithgas.com/

Working on Engine Cowl

--- TYA2 <tya2(at)4-fly.net> wrote:



 ......  For long cross country flying you won't have

the luxury of prowling junk yards or looking for parts

when you break down in Podunk Nebraska or



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