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701 vs 750 - useful load

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kenryan(at)alaska.net
Guest

Posted: Sun Aug 10, 2008 7:55 pm Post subject: 701 vs 750 - useful load

Thanks to those who responded to my

query on empty weights for the 701. 



More input would be welcome!



Zenith lists the useful load for the 750 as 545 lbs.

(as compared to 520 for the 701) . . . 



BUT



Sebastian told me that using the Rotax 914 in-

stead of the 0-200 would save about 100 lbs.



I think he's a little high on that, but I do believe

you would save 75 lbs. (and gain 15 hp) so that 

would bring the useful load up to 620 lbs. (More if 

you figure in the reduced weight of your wallet.)



Data I've seen regarding fuel consumption at 65%

power is:



912 UL		4.2 gph

912 ULS	4.8 gph

914 UL		4.8 gph



So it looks to me like if you go 750 with the powerful

Rotax, you will gain 100 lbs. useful load with no fuel 

penalty (at least at cruise).



Consumption for the 914 does jump at higher power

settings:



75%	5.7 gph

100%	9.0 gph





-- 

Ken Ryan

http://kenryan.com

"Only two things are infinite, the universe and human stupidity, 

and I'm not sure about the former." -Albert Einstein-

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craig(at)craigandjean.com
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Posted: Sun Aug 10, 2008 8:22 pm Post subject: 701 vs 750 - useful load

A middle ground would be to fly the 750 with a Jabiru 3300.



-- Craig



--

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billmileski

Joined: 07 Aug 2006
Posts: 68
Location: Ledyard, CT

Posted: Sun Aug 10, 2008 8:44 pm Post subject: Re: 701 vs 750 - useful load

Ken,

The fuel consumption figures for the 912 series seem a bit high to me;  I regularly see less than 4 gph with a 912S, with a 701 cruising at 85mph, which I assumme must be at least 65% power. 



Although I wonder.. the plane will do 110mph at full throttle, and if propellor/airframe load varies with the square of velocity, then it's possible that 85mph is more like 60% power..



Bill Mileski

701 912S 140 hrs

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kevinthorp

Joined: 22 Jun 2008
Posts: 5
Location: Charleston SC

Posted: Fri Aug 15, 2008 6:48 pm Post subject: Re: 701 vs 750 - useful load

 	  craig(at)craigandjean.com wrote: 	
		  A middle ground would be to fly the 750 with a Jabiru 3300. -- Craig



-- 	




That would gain more useful load over a Cont engine, but wouldn't it also shift the CG back, reducing the baggage you could carry?

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craig(at)craigandjean.com
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Posted: Fri Aug 15, 2008 7:00 pm Post subject: 701 vs 750 - useful load

I don't know. I suspect the motor mount for the Jabiru places the engine's

CG farther forward than the mount for the Cont. I believe a 601XL with a

Jabiru can carry just as much baggage as an XL with a heavier engine.



-- Craig



--

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craig(at)craigandjean.com
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Posted: Fri Aug 15, 2008 7:04 pm Post subject: 701 vs 750 - useful load

Also on the XL with the Jabiru 3300 the battery is mounted on the firewall.

On heavier engines the battery commonly goes behind the seat or in the tail.



-- Craig



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Joemotis(at)aol.com
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Posted: Fri Aug 15, 2008 8:46 pm Post subject: 701 vs 750 - useful load

How about a 750 with a Raven redrive on the big fuel injected Suzuki 1.3 ,  I believe the 1998 model year is the optimum.?

 Is any one running this in a CH 701? How much does the engine and cooling  system with coolant in it weigh?

As in a number one could use as a  benchmark.

  

 Thanks

  

 Joe Motis

 Do not archive



Looking for a car that's sporty, fun and fits in your budget? Read reviews on AOL Autos.

  [quote][b]

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kmccune

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

Posted: Sat Aug 16, 2008 4:51 am Post subject: Re: 701 vs 750 - useful load

Don't forget that the 750 also carrys  3 gallons or 18 lbs more fuel in standard trim. so knock that off the 25lb advantage.  



On G13 wet weight:

" 175lbs. dry for engine/redrive/computer/exhaust. Add 15lbs. for turbo

kit. Add 5-6 lbs. for radiator. We will be 17- 20 lbs heavier than 912

Rotax installation. Proportionally less for the 914 turbo Rotax equivalent

as our exhaust/turbo/ intake plenum are lighter than Rotax for the turbo

version." 

 This is from  Raven on the SVS1300 Turbo, don't forget the weight of the  stuff Rotax hangs on the firewall when figuring Rotax weight.



Kevin

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