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S7-914 Empty Weight...and questions?

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darinh

Joined: 20 Apr 2006
Posts: 327
Location: Utah

Posted: Thu Jul 10, 2008 12:00 am Post subject: S7-914 Empty Weight...and questions?

Well, I have the DAR scheduled for Monday morning at 9 am.  Did the W&B tonight and came up with 855 lb empty (includes oil and coolant).  I did have a question though for those that have a Series 5 thru 7.



The manual shows the datum (leading edge of wing at the root) to be just in front of the mains (center of axle).  My datum ended up opposite and just behind the main axles by 2 3/8" when she is level (the gear are in the correct orientation).  What have others found?  Also, when in level attitude, the weight on the tailwheel was 53 lbs.  Looking at the example in the manual (Section M pg. 86) I see the tailwheel showing like 165 lbs or something in that range.  Are these values in the example table simply arbitrary numbers that were pulled out of the air when Skystar wrote the manual?  What do others have (actual weights) for their mains and tailwheels?  Just want to check if my scales were reading correctly.



As a side note, I am happy with the weight as I was estimating closer to 875 lbs. just on the gut feel.

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Darin Hawkes
Series 7
914 Turbo
Kaysville, Utah

Tom Jones

Joined: 12 Mar 2006
Posts: 752
Location: Ellensburg, WA

Posted: Thu Jul 10, 2008 4:55 am Post subject: Re: S7-914 Empty Weight...and questions?

 	  Quote: 	
		  Also, when in level attitude, the weight on the tailwheel was 53 lbs. Looking at the example in the manual (Section M pg. 86) I see the tailwheel showing like 165 lbs or something in that range. Are these values in the example table simply arbitrary numbers that were pulled out of the air when Skystar wrote the manual? 	




Darihn, I don't have a 5 or 7 but can say for sure the 165 pound tail wheel weight is a mistake.  That would be closer to being the tail wheel arm in inches.  My Classic 4 tail wheel weighs 35 pounds when the fuselage is level.

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Tom Jones
Classic IV
503 Rotax, 72 inch Two blade Warp
Ellensburg, WA

Vic Baker

Joined: 11 Jan 2006
Posts: 71
Location: Carson City, Nevada

Posted: Thu Jul 10, 2008 5:08 am Post subject: S7-914 Empty Weight...and questions?

Darinh,



My manual, section M page 86,  indicates Nose/Tailwheel at 195 lbs.  Given 

the indicated arm of -35.4 I conclude that is for the nosewheel.



My 7, as I believe is also yours, is conventional gear  (with tailwheel).



My weight came in at 827 lbs.  The arm (level position) at -2.38 on the main 

axles.  My weight on the tail wheel is 71 lbs.  (seems a little heavy, 

don't know what that is all about....)



Your numbers look fine to me.



Hope this helps.

Vic





Vic Baker

S7 912S Warp 100%

Carson City, Nv

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Vic Baker
Series 7
Carson City, Nevada

darinh

Joined: 20 Apr 2006
Posts: 327
Location: Utah

Posted: Thu Jul 10, 2008 8:20 am Post subject: Re: S7-914 Empty Weight...and questions?

Vic, 



My mains came out the same -2.38" (forward of Datum).  



Tom,



Don't I look like an idiot!  I didn't even notice the arm in the example...just assumed it was a tailwheel example because that is what I am building.  Makes much more sense as a nosewheel.



Thanks guys for the replies...Airworthiness here we come!

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Darin Hawkes
Series 7
914 Turbo
Kaysville, Utah

Float Flyr

Joined: 19 Jul 2006
Posts: 2704
Location: Campbellton, Newfoundland

Posted: Thu Jul 10, 2008 12:39 pm Post subject: S7-914 Empty Weight...and questions?

165lb. sounds like it may be the weight on the tail wheel with the wings

folded.



Noel



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Noel Loveys
Kitfox III-A
Aerocet 1100 Floats

Fox5flyer
Guest

Posted: Thu Jul 10, 2008 2:13 pm Post subject: S7-914 Empty Weight...and questions?

Even that seems a bit high.

Deke

do not archive



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davestapa

Joined: 13 Mar 2007
Posts: 30
Location: Woodstock, GA

Posted: Thu Jul 10, 2008 5:39 pm Post subject: S7-914 Empty Weight...and questions?

I have the 912 ULS in a Series 5. Weights are  Left Main 390 lbs, Right

Main 376 Lbs, Tail wheel  67 lbs for a total of 833 lbs.



C. David Estapa

Woodstock, Georgia

N97DE S5 TD 912ULS



On Thu, 10 Jul 2008 01:00:26 -0700 "darinh" <gerns25(at)netscape.net>

writes:

 	  Quote: 	
		   

 

 Well, I have the DAR scheduled for Monday morning at 9 am.  Did the 

 W&B tonight and came up with 855 lb empty (includes oil and 

 coolant).  I did have a question though for those that have a Series 

 5 thru 7.

 

 The manual shows the datum (leading edge of wing at the root) to be 

 just in front of the mains (center of axle).  My datum ended up 

 opposite and just behind the main axles by 2 3/8" when she is level 

 (the gear are in the correct orientation).  What have others found?  

 Also, when in level attitude, the weight on the tailwheel was 53 

 lbs.  Looking at the example in the manual (Section M pg. 86) I see 

 the tailwheel showing like 165 lbs or something in that range.  Are 

 these values in the example table simply arbitrary numbers that were 

 pulled out of the air when Skystar wrote the manual?  What do others 

 have (actual weights) for their mains and tailwheels?  Just want to 

 check if my scales were reading correctly.

 

 As a side note, I am happy with the weight as I was estimating 

 closer to 875 lbs. just on the gut feel.

 

 --------

 Darin Hawkes

 Series 7 (Final Assembly)

 914 Turbo

 Kaysville, Utah

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=192090#192090

 

 

 

 

 

 

 

 

 

 

 

 

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_________________
C. David Estapa
Woodstock, GA
S5TD N97DE

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