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Ch-701 and Jabiru Engine Choices

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brothapig(at)HOTMAIL.COM
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Posted: Tue Jul 31, 2007 9:59 am Post subject: Ch-701 and Jabiru Engine Choices

I'm thinking about engine choices for my 701 (for the future).  I was always set on the 912S, because I might put floats on my plane some day.  At AirVenture this year, however, I took a walk through the Jabiru tent and looked at their engines.  I flat out told the sales guy to convince me to purchase a Jabiru over a Rotax, and he just might have.  I really like that little engine, and it's simplicity, and the fact it is very very similar in design to a Lycoming/Continental (speaking to my comfort zone only here).

 However...

  

 The 2200 is only 85 hp; 15 hp short of the 912S, which is what I wanted, but 5 hp more than the 912 (which has already proven itself in the 701 airframe already).  

  

 The 3300 is a much bigger engine, but still within weight specs, albeit very very close.  It does exceed the hp limitation of 100 hp, but Jabiru, like Rotax, limits the 120 hp to "intermittent" only, (basically takeoff power), then drops back to 105 hp (much closer to the design spec).  Also, at the lower hp, the Jabiru is spinning slower (read bigger prop).

  

  

 Has anyone put a 3300 in a 701?  Is it indeed too heavy, where any gains in hp over the 2200 will be lost?

  

 To the 2200 flyers out there, are you happy with the 701's performance with a 2200?  I'm curious about climb rate and cruise speed.  I know the 701 is not a cross country machine, but I would like as much as I could get, if I ever fly anywhere in particular 

  [quote][b]

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craig(at)craigandjean.com
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Posted: Tue Jul 31, 2007 10:37 am Post subject: Ch-701 and Jabiru Engine Choices

 	  Quote: 	
		    Has anyone put a 3300 in a 701?


	


Here is a 3300 on Jim Sagerser's 701:

www.usjabiru.com/Zenith%20701%20fwf.htm



-- Craig

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psm(at)ATT.NET
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Posted: Wed Aug 01, 2007 3:17 am Post subject: Ch-701 and Jabiru Engine Choices

At 10:57 AM 7/31/2007, you wrote:

 	  Quote: 	
		  It does exceed the hp limitation of 100 hp, but Jabiru, like Rotax, 

limits the 120 hp to "intermittent" only, (basically takeoff power), 

then drops back to 105 hp (much closer to the design spec).


	


You need to be careful about this kind of thinking.  I believe the 

potential problem from having too much horsepower is the chance that 

your flight controls won't have sufficient authority to overcome the 

torque when you perform a "Go-around".  This can cause the plane to 

flip over when low and slow and close to the ground -  not the best 

situation to find yourself in.



I strongly urge you to get designer approval if you plan to install 

an engine larger than the maximum specified on your prints.



Paul

Xl fuselage

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jetboy

Joined: 22 Jul 2006
Posts: 233

Posted: Wed Aug 01, 2007 10:02 pm Post subject: Re: Ch-701 and Jabiru Engine Choices

Its correct that looking outside the envelope needs to be done cautiously,

there are several 701 flying with the 3300. 



I think the main issue would be cooling, as with my 701 / 2200 its OK but adding 50% more heat and increasing the climb angle may prove more troublesome.



The 3300 is only likely to deliver the same thrust as a 912S and I'm sure that won't present any problems, due to the small prop and direct drive. If the cost is the same, I would use the 912. For my aircraft, the 2200 worked out $8,000 or so less than a 912UL to install, and I wanted the simplicity more than the higher climb rate.



Ralph

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Ralph - CH701 / 2200a

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