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Jab 2200 vs 3300

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Tim Juhl

Joined: 21 Mar 2006
Posts: 488
Location: "Thumb" of Michigan

Posted: Fri May 30, 2008 6:21 pm Post subject: Jab 2200 vs 3300

I and a friend are at Jabiru USA taking the engine class this weekend.  He ordered a 3300 which he is yet to take delivery on.  There has been some discussion as to whether the 3300 is too powerful for the airframe and that a 2200 might be a much better fit.  I'm building a 601 so I hope some of you 701 pilots can share your experiences and advice.



Tim Juhl

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_________________
______________
CFII
Champ L16A flying
Zodiac XL - Jabiru 3300A
Almost done! It'll fly in spring!

cffd(at)pgrb.com
Guest

Posted: Sun Jun 01, 2008 12:10 pm Post subject: Jab 2200 vs 3300

Tim,

I have a Jab 2200 on my 701 (Dry weight 570 lbs).  It seems to perform close 

to an 80 HP Rotax 912.

As draggy as the 701 is (which increases with airspeed), it is not clear if 

much is to be gained in cruise.  Take off and climb might be better, but it 

will be heavier.

Chuck D.

N701TX



 	  Quote: 	
		  

 I and a friend are at Jabiru USA taking the engine class this weekend.  He 

 ordered

 a 3300 which he is yet to take delivery on.  There has been some 

 discussion

 as to whether the 3300 is too powerful for the airframe and that a 2200 

 might

 be a much better fit.  I'm building a 601 so I hope some of you 701 pilots 

 can

 share your experiences and advice.



 Tim Juhl



 --------

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kmccune

Joined: 22 Sep 2007
Posts: 577
Location: Wisconsin, USA

Posted: Sun Jun 01, 2008 1:54 pm Post subject: Re: Jab 2200 vs 3300

Jab 2200 85hp   (at) 3300RPM =135ft-lb prop torque



Jab 3300 120hp (at) 3300RPM = 191ft-lbs prop torque



912 80 hp (at) 5500 ROM = 76 ft-lbs x 2.43 reduction = 185 ft-lbs prop torque 



912s 100hp (at) 5800 RPM = 90 ft-lbs x 2.43 reduction =218ft-lbs prop torque

Number for Jab from their web site, Rotax numbers from Zenith web site.

 Though I'm not sure about the reduction ratio on the 912.

Looks to me like the 3300 is the best match. Kinda like a light Corvair engine!

Kevin

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_________________
“Always do what you are afraid to do.”
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Dorothy McCune

rbjjr

Joined: 18 Mar 2007
Posts: 36

Posted: Sun Jun 01, 2008 2:08 pm Post subject: Re: Jab 2200 vs 3300

Now that you mention it, I wonder how the Corvair does compare and, how that translates into performance, especially climb.



Thanks,



Burke Johnson

CH701

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kmccune

Joined: 22 Sep 2007
Posts: 577
Location: Wisconsin, USA

Posted: Tue Jun 03, 2008 10:30 am Post subject: Re: Jab 2200 vs 3300

I forgot to mention that the Jabs are both limited I believe, to a 60 inch prop.  I believe it is a crank limitation due to mass for their limit, I could be wrong its just something I think that I remember. There is more to prop thrust then length but it is a prime component. Some place on the Zenith site they mention the need to swing a 70 or 72 inch prop for good STOL performance.



Kevin

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Tim Juhl

Joined: 21 Mar 2006
Posts: 488
Location: "Thumb" of Michigan

Posted: Tue Jun 03, 2008 12:18 pm Post subject: Re: Jab 2200 vs 3300

Thanks all for your comments.  My friend changed his order to a 2200.



The prop on a Jab is shorter but that is partly due to the fact that it turns 3300 rpm at full power.  A longer prop and you could experience the tips going supersonic.  The 3300 swings a 64 inch prop.



I know there have been some issues with the crank in the Corvair but have not heard of any on the Jab.  



Tim

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_________________
______________
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Champ L16A flying
Zodiac XL - Jabiru 3300A
Almost done! It'll fly in spring!

kmccune

Joined: 22 Sep 2007
Posts: 577
Location: Wisconsin, USA

Posted: Tue Jun 03, 2008 6:23 pm Post subject: Re: Jab 2200 vs 3300

Your correct about the RPM and tip speed, but I believe that there was a rotational mass limit. And strangely, I remember that  I heard about it on a corvair website? Any way, 66" and 3300 rpm (at) 0F is Mach .905 so 64" maybe a MFG safety margin? Then again, it is entirely possible that I'm mistaken  Been known to happen  



Kevin

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