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Flying today
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amyvega2005(at)earthlink.
Guest

Posted: Sun Feb 10, 2008 4:44 pm Post subject: Flying today

Dave,

actually thats not quite correct.  If you have an engine that is a bt heavier, the mount will only do so much.  you still need the space between the engine and the fire wal for other things like filter, carbi, etc.  that is why some planes carry the battery in back.  the 601 needs the weight and balance, and even though mine shows CG aft, it still needs a bit of back weight, with one guy flying solo.  With two people the CG and weight is more neutral.



Juan



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bryanmmartin

Joined: 10 Jan 2006
Posts: 1018

Posted: Sun Feb 10, 2008 5:12 pm Post subject: Flying today

I had to modify the bottom side of the cut out some for mine.



On Feb 10, 2008, at 3:03 PM, eddies wrote:



 	  Quote: 	
		   



 Hi Scott,



 When you replaced the brackets, did you have to modify the cutout in  

 the skin of the rear turtle deck that the front of the horizontal  

 stab sits in?



 Also what if any modifications did you need to make to the fiber  

 glass rudder fairing.



 I am having the same issue, anything more than 10 degrees of flap  

 and I cannot trim for hands off on landing and I have the larger  

 trim tab installed



 Thanks

 Eddie


	


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Bryan Martin

N61BM, CH 601 XL,

RAM Subaru, Stratus redrive.

do not archive.

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_________________
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Bryan Martin
N61BM, CH 601 XL, Stratus Subaru.
do not archive.

eddies

Joined: 20 Jun 2006
Posts: 40
Location: Australia

Posted: Sun Feb 10, 2008 8:41 pm Post subject: Re: Flying today

Hi Guys,



There is another 601XL just recently flying out of my airport with a Jab 3300, this Zodiac has the gear flat to the front giving a more forward CG and it requires even more trim to fly strait and level, so I am guessing that this will be a common issue. (Both have the large trim tab fitted)



My only concern with the change was having to cut the rear turtle deck and also modify the fiber glass rudder saddle, only because I have already painted the plane   



Eddie

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ashontz

Joined: 27 Dec 2006
Posts: 723

Posted: Mon Feb 11, 2008 5:04 am Post subject: Re: Flying today

I would agree that the underlying problem is either the engine mount or just, too heavy of an engine for CG reasons. Still I'm going to use the Corvair anyway. A bigger trim tab or a slightly more negatively inclined stabilizer will help, but it's also adding more drag either via the deflection of the elevator and trim tab or the deflection of the whole assembly. Having a stabilizer in the rear means you're creating negative lift to hold up the nose, which of course means you're  taking away from the overall lift of the plane, adding drag etc... A more tail heavy plane, albeit extremely dangerous, is much faster, and of course a Canard design has less drag yet being that both the stabilizer and wings are providing lift. But that's a whole nother issue. Be interesting to see if someone comes up with a better engine mount design by the time I'm ready to install the engine. Or maybe I'll try making one myself.



 	  Sabrina wrote: 	
		  If you were to review the empty CGs of the "heavy" engine aircraft and compare them to the empty CGs of the light engines (all with factory designed engine mounts) you will find that they are nose heavy or have a more forward empty CG (often nearing max. forward CG) as compared to the "light" engine craft.  AMD could have done a better job designing the O-200 engine mount that Zenith sells--they have it a little too far forward.   If you carry maximum baggage in back, you need it, but otherwise, it creates a "nose heavy" airplane that many people have a hard time trimming.  Look firsthand at some AMD S-LSAs out there, there is no way those H stabs are neutral.  If you still don't believe, measure the rise of the nose strut top stop plate on two craft of the same age (same bungee age).  The heavy engine stop plate is raised, the light engine craft are not raised as much and are often "topped out."

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jlatimer1(at)cox.net
Guest

Posted: Tue Feb 12, 2008 9:13 am Post subject: Flying today

Nice videos

Jerry

do not archive 



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