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SA article planned on Z601HDS performance

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charles.long(at)gm.com
Guest

Posted: Wed May 17, 2006 8:54 am Post subject: SA article planned on Z601HDS performance

Hello everyone,



Mike Mossman and I am planning to write a two-part article for Sport

Aviation. The first part will be a discussion of an Aerodynamics Simulator

for Homebuilt aircraft. The second part will be a discussion of how well

the simulator predicts peformance of six engine combinations in the Zenith

601HDS. There should be a considerable amount of interest in this subject

since fuel prices continue to rise and our Zodie Rockets are a pretty

economical way to stay in the air. I have previously published two articles

in SA on Budget Flight Simulators and I'm optimistic that a well-written

article on this subject will publish as well.



We are interested in finding pilots with 601HDS's willing to perform a

1-1/2 hour flight test on their aircraft measuring its peformance at 7500

ft. Basically, you will be measuring WOT climb and CT descent rates at

various airspeeds. (A GPS is required to accurately measure ground speed in

opposite directions). If you are interested, please contact me off line and

I can provide you with a test card and instructions.



The test results will be compiled and we can share them with this list and

the ZAC newsletter upon completion. The six engines we are planning to

include are:



   Jabiru 2200

   Jabiru 3300

   Rotax 912

   Rotax 912s

   Convair conversions

   Subaru conversions



We might consider other engines as well, but need at least two samples of

each type to confirm the numbers are reasonably consistent. This will be a

fairly big undertaking but will provide lots of good press for our

airplanes and a useful simulator for the general homebuilding community.



Thanks

Chuck Long, PE/CFI

Z601HDS/Jab3300

N601LE 70 hr TT

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frank.hinde(at)hp.com
Guest

Posted: Wed May 17, 2006 9:29 am Post subject: SA article planned on Z601HDS performance

I'm not sure that the data you gather with the flight tests will be indicative of engine performance...I.e fuel economy.



I,e 2 100HP engine's run at WOT at the same fuel/air mixture will burn the same amount of fuel. I think the differences you will really measure will be differences in drag between the HDS's. We all know there are differences between the same model and some have done drag reduction mods so these will be the fastest for the same amount of thrust. The only difference between fuel economy in engines would be if they had fuel injection and you could run lean of peak EGT (all carbed engines run Rich of peak EGT) where the efficiency improves quite a bit.



Not saying this is a waste of time but there are many variables that you will need to take into account to get any conclusions that are meaningful. For example, a 120HP Jab turning at 3300RPM with a Prince prop and drag reduction mods on a cool day will be a totally different outcome to an HDS with no mods, Rotax 912 with a Warp drive on a warm day.



I just doubt the data would be enable you to say anything useful as there too many variables...Exept a 120HP will climb faster than than a 100HP motor...Assuming they are both making rated power.



If you look at some of the work the CAF foundation has done you will see they spend some hours instrumenting each aircraft before they can measure performance with any certainty



Just a thought.



Incidently there are a number of speed measuring conversions on the web that will calculate airspeed based on a three way run...But even that is not as easy to do as you might think...i tired doing this the other evening and the more power I added the slower it went in one direction (clearly wind was changing over the 3 miles I covered getting data). Even holding a course without an autopilot is not trivial.



Frank



Do not archive



  



--

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demeo(at)sonic.net
Guest

Posted: Wed May 17, 2006 10:45 am Post subject: SA article planned on Z601HDS performance

Lance Gingell in California has a Jabiru in his Zodiac XL.  I think he's 

in the web ring. 



charles.long(at)gm.com wrote:



 	  Quote: 	
		  

Hello everyone,



Mike Mossman and I am planning to write a two-part article for Sport

Aviation. The first part will be a discussion of an Aerodynamics Simulator

for Homebuilt aircraft. The second part will be a discussion of how well

the simulator predicts peformance of six engine combinations in the Zenith

601HDS. There should be a considerable amount of interest in this subject

since fuel prices continue to rise and our Zodie Rockets are a pretty

economical way to stay in the air. I have previously published two articles

in SA on Budget Flight Simulators and I'm optimistic that a well-written

article on this subject will publish as well.



We are interested in finding pilots with 601HDS's willing to perform a

1-1/2 hour flight test on their aircraft measuring its peformance at 7500

ft. Basically, you will be measuring WOT climb and CT descent rates at

various airspeeds. (A GPS is required to accurately measure ground speed in

opposite directions). If you are interested, please contact me off line and

I can provide you with a test card and instructions.



The test results will be compiled and we can share them with this list and

the ZAC newsletter upon completion. The six engines we are planning to

include are:



   Jabiru 2200

   Jabiru 3300

   Rotax 912

   Rotax 912s

   Convair conversions

   Subaru conversions



We might consider other engines as well, but need at least two samples of

each type to confirm the numbers are reasonably consistent. This will be a

fairly big undertaking but will provide lots of good press for our

airplanes and a useful simulator for the general homebuilding community.



Thanks

Chuck Long, PE/CFI

Z601HDS/Jab3300

N601LE 70 hr TT



 

 

 





  




	


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p.mulwitz(at)worldnet.att
Guest

Posted: Wed May 17, 2006 1:25 pm Post subject: SA article planned on Z601HDS performance

I anxiously await hearing your results.  I don't have a flying plane 

yet, but I still need to finalize my choice of engines.  Since I want 

the most performance I can get, you test results will be of great 

interest to me.



Do you have a plan for when your numbers will be available?  Are you 

considering dribbling them on the list as they are developed?



Paul

XL wings

do not archive



 	  Quote: 	
		  We are interested in finding pilots with 601HDS's willing to perform a

1-1/2 hour flight test on their aircraft measuring its peformance at 7500

ft. Basically, you will be measuring WOT climb and CT descent rates at

various airspeeds. (A GPS is required to accurately measure ground speed in

opposite directions). If you are interested, please contact me off line and

I can provide you with a test card and instructions.



The test results will be compiled and we can share them with this list and

the ZAC newsletter upon completion. The six engines we are planning to

include are:



    Jabiru 2200

    Jabiru 3300

    Rotax 912

    Rotax 912s

    Convair conversions

    Subaru conversions


	


-

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frank.hinde(at)hp.com
Guest

Posted: Wed May 17, 2006 1:52 pm Post subject: SA article planned on Z601HDS performance

I would suggest that if you want utmost performance for an XL then the

Jab 3300 is the clear winner for two reasons.



1) It is the highest horsepower engine.

2) It is air cooled.



Air cooled engine use less air to cool than do water cooled engines

because the cylinder heads run at a higher temp than do the radiators on

a water cooled motor. The XL being a little faster than the HDS will

make this effect more pronounced because drag is proportional to the

square of the speed...This is good for max speed and cruise. For climb

you want power.



Here is another suggestion...how about a 150HP Ram Subaru

conversion?....Now that will really climb but maybe slightly slower in

top end speed.



Frank



 



--

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