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C-85 in 601XL???

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DaveG601XL

Joined: 27 Oct 2006
Posts: 351
Location: Cincinnati, Oh

Posted: Mon Nov 27, 2006 3:10 pm Post subject: C-85 in 601XL???

I am early in my 601XL build and am still considering engine choices.  I have the opportunity to use a C-85 engine.  It was meant for another project that will probably never get completed due to the builders age. It is a close family member, so if I asked for it, I could probably get it for free.



Has anybody put a C-85 in an XL or ever considered it?  I am concerned with how much of a deficit I would see in speed, max weight and useful load vs. the published and actuals people are seeing with the Rotax and Jabiru engines.



Thanks for any advice or opinions,



Dave G

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David X

Joined: 10 Jan 2006
Posts: 154
Location: Princeton, NJ, USA

Posted: Mon Nov 27, 2006 5:42 pm Post subject: Re: C-85 in 601XL???

 	  DaveG601XL wrote: 	
		  I have the opportunity to use a C-85 engine.  It is a close family member, so if I asked for it, I could probably get it for free. 	




It's tough to beat "free" ... but I'm sure someone on this forum will tell you this or that engine is better. There are quite a few loyalists behind each model.



The useful load specs that they publish on the Zenith site are bogus (in my opinion). The best I've seen is 590 lbs useful load with a Rotax 912. I suppose if you didn't paint the aircraft, and you didn't count the weight of oil and the 1/2 gallon of unusable fuel in each tank ... you might approach the 630 lbs quoted in the specs; but I doubt it.



I can speak only for the Rotax. Weight is a big factor in a small plane, like the Zodiac. Can't speak for the C-85 ... but the O-200 is about 45 pounds heavier than the Rotax 912S, which will reduce your max pilot+copilot weight (with full tanks) to about 365 lbs. The Jabiru 3300 is appearantly only 5 pounds heavier than the Rotax with 10 more HP. 



http://www.zenithair.com/zodiac/xl/specification.html



The landing bar that comes with the kit is 40 lbs all by itself (ouch). There is a composite gear from CZAW that is much lighter (see Aircraft Spruce) but requires some changes to the design. You'll save about 25 lbs that way, and rear of the CG where you'll need to lose it (the Zodiac tends have a heavy rear).



You can probably save a bit more depending on the choice of prop and battery. Little hear, little there.

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_________________
Zodiac 601 XL - CZAW Built - Rotax 912S
DO NOT ARCHIVE

btucke73(at)yahoo.com
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Posted: Mon Nov 27, 2006 7:59 pm Post subject: C-85 in 601XL???

Dave,

   

       I have a good friend that is almost complete with his 601HDS with Cont O-200.  He is too old to fly it, but has been very slowly plugging along on the aircraft for over 12 years.  I think he was one of the very first kit buyers.  He is now too old to even work on it, and has friends do the work.  His wife asked me to finish the project, which I hope to do, but I am too busy getting mine back in the air.  He has a mold in the shop for a custom cowling to house the engine.  I am not sure if he bought or built his engine mount.  I also know that he has a Warp Drive to put on it, and put the battery behind the seats.  If you e-mail me off-list with specific questions about the installation, I can call and ask.  

   

  R/

   

  Brandon

   



   [quote][b]

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