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Fus overlaps

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secatur

Joined: 02 Nov 2006
Posts: 50
Location: New Zealand

Posted: Fri Jan 05, 2007 12:47 am Post subject: Fus overlaps

When joining the front fus to the rear fus, the plans and the pictorials say the overlap faces forwards(..sides and bottom back of u/c channel)

Way back when I was an apprentice airframe mech (Air Canada) we were taught that all overlaps face aft...anybody done it that way???



Steve

701 in Perth WA

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bryanmmartin

Joined: 10 Jan 2006
Posts: 1018

Posted: Fri Jan 05, 2007 2:30 am Post subject: Fus overlaps

You're not building a 500 knot airliner, at 90 knots it doesn't make  

a whole lot of difference which way the overlaps face.

On Jan 5, 2007, at 3:47 AM, secatur wrote:



 	  Quote: 	
		   



 When joining the front fus to the rear fus, the plans and the  

 pictorials say the overlap faces forwards(..sides and bottom back  

 of u/c channel)

 Way back when I was an apprentice airframe mech (Air Canada) we  

 were taught that all overlaps face aft...anybody done it that way???



 Steve

 701 in Perth WA




	


-- 

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.

roger(at)nwtradingpost.co
Guest

Posted: Fri Jan 05, 2007 9:11 am Post subject: Fus overlaps

Steve



I am at the same point as you are with my 701, but I read the plans and the

pictorials differently : the overlap faces rearwards i.e. the front fuselage



Overlaps the rear fuselage



Roger

701 in Kenmore, WA

(formerly from the colonies)



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nyterminat(at)aol.com
Guest

Posted: Fri Jan 05, 2007 4:33 pm Post subject: Fus overlaps

That is the way that I did it

    

   Bob Spudis

   N701ZX/912S/100hrs

    

   do not archive 

    

  

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secatur

Joined: 02 Nov 2006
Posts: 50
Location: New Zealand

Posted: Tue Jan 09, 2007 5:16 am Post subject: Re: Fus overlaps

Thanks for the comments! I have decided that some of the pictures are contrary to the plans and other pictures...so I have decided to stick to the overlap I think is right !



By the way Bryan..stick your head out your car window at 90 mph...and see what gets in your eyes!!!  



Thanks again all !



2000 rivets down 6000 to go !

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bryanmmartin

Joined: 10 Jan 2006
Posts: 1018

Posted: Tue Jan 09, 2007 5:49 am Post subject: Fus overlaps

My eyelids aren't made out of aluminum and held shut with rivets with  

proper edge spacing. 

On Jan 9, 2007, at 8:16 AM, secatur wrote:



 	  Quote: 	
		  

 Thanks for the comments! I have decided that some of the pictures  

 are contrary to the plans and other pictures...so I have decided to  

 stick to the overlap I think is right !



 By the way Bryan..stick your head out your car window at 90  

 mph...and see what gets in your eyes!!! [Twisted Evil]




	


-- 

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.

Chris Lewis

Joined: 17 Mar 2006
Posts: 56
Location: Seattle

Posted: Tue Jan 09, 2007 7:42 am Post subject: Re: Fus overlaps

I spoke with Chris Heintz at the Quality Sportsplanes open house last summer and and he indicated that you get a cleaner shape over all with the rear skin overlapping the front due to boundary layer effect. 



As he explained it - a forward facing overlap of only the skin thickness is close enough to the wing surface to not be in the airflow. A rearward facing overlap actually changes the airflow slightly generating additional drag. It's almost unmeasurable and given people's intuitive response to overlap (see above) and the proven ability to shed rain with a rearward overlap, he designed most surfaces with the forward skin overlapping the rear.



I've traveled to Mexico, Mo and to California to visit Zenith staff. Expensive and time consuming for sure, but little tidbits like this information make it all worthwhile.



Chris in Seattle

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roger(at)nwtradingpost.co
Guest

Posted: Tue Jan 09, 2007 10:35 pm Post subject: Fus overlaps

Chris



Most Interesting! In Drawings 7-F-12 and 7-F-13 Chris Heinz shows a rearward

facing overlap



Guess I will stick with the drawings



Roger

701 in Kenmore, WA



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