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Out-of-spec 601XL/Jabiru 3300 motor mount

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craig(at)craigandjean.com
Guest

Posted: Thu Aug 23, 2007 1:38 pm Post subject: Out-of-spec 601XL/Jabiru 3300 motor mount

My motor mount was supplied by Jabiru USA about 8 months ago. After seeing

that the engine's thrust-line didn't match the Zenith plans I took some

measurements of the mount's tubes as requested by Jabiru USA. They said that

the top tubes were about 10 cm too long and that they would exchange the

mount. So if you have such a mount do some checking before you paint your

mount and hang your engine. The easiest way to check the mount is with a

digital level.



-- Craig

Gig Giacona

Joined: 10 Jan 2006
Posts: 1416
Location: El Dorado Arkansas USA

Posted: Thu Aug 23, 2007 1:50 pm Post subject: Re: Out-of-spec 601XL/Jabiru 3300 motor mount

10 cm or mm? 



Do Not Archive

_________________
W.R. "Gig" Giacona
601XL Under Construction
See my progress at www.peoamerica.net/N601WR

craig(at)craigandjean.com
Guest

Posted: Thu Aug 23, 2007 2:00 pm Post subject: Out-of-spec 601XL/Jabiru 3300 motor mount

mm - what's an order of magnitude among friends? 



-- Craig



--

Tim Juhl

Joined: 21 Mar 2006
Posts: 488
Location: "Thumb" of Michigan

Posted: Thu Aug 23, 2007 4:14 pm Post subject: Re: Out-of-spec 601XL/Jabiru 3300 motor mount

Would you be so kind as to share the measurements Jabiru sent you?  I have an engine mount that I received from them in May but who knows when it was made......



Thanks!



Tim

_________________
______________
CFII
Champ L16A flying
Zodiac XL - Jabiru 3300A
Almost done! It'll fly in spring!

craig(at)craigandjean.com
Guest

Posted: Thu Aug 23, 2007 4:45 pm Post subject: Out-of-spec 601XL/Jabiru 3300 motor mount

I only have the measurements I made and the "top tubes 10 mm too long"

comment from Jabiru USA. Below are my measurements. Since the tubes are cut

on a diagonal these measurements are on the longest, outside edges of the

tubes from the plates at the firewall to the disks at the rear of the engine

mount "pins". Take these measurements as approximate as it was hard to make

some of them with a steel tape with the mount and engine on the plane:



top tube, pilot side:       445 mm

top tube, copilot side: 465-470 mm

bottom, pilot side:         380 mm

bottom, copilot side:   400-405 mm



What is actually critical is the angle of the engine (horizontal and

vertical) to the firewall. So it is best to measure these directly and

compare them to 6-JE-1 in the Zenith plans.



-- Craig

dredmoody(at)cox.net
Guest

Posted: Fri Aug 24, 2007 5:42 am Post subject: Out-of-spec 601XL/Jabiru 3300 motor mount

The greatest order of magnitude I've witnessed among my friends was six pitchers of draught at a sports bar. My friends love cold alcohol in magnitudinous quantities.



Dred 

Do Not Archive



---- Craig Payne <craig(at)craigandjean.com> wrote: 

 	  Quote: 	
		   

 

 mm - what's an order of magnitude among friends? 

 

 -- Craig

Tim Juhl

Joined: 21 Mar 2006
Posts: 488
Location: "Thumb" of Michigan

Posted: Fri Aug 24, 2007 9:05 am Post subject: Re: Out-of-spec 601XL/Jabiru 3300 motor mount

Just to be sure I understand you correcly.....  The measurements you provided were of the original mount that was "too long", correct?



Tim

_________________
______________
CFII
Champ L16A flying
Zodiac XL - Jabiru 3300A
Almost done! It'll fly in spring!

craig(at)craigandjean.com
Guest

Posted: Fri Aug 24, 2007 11:11 am Post subject: Out-of-spec 601XL/Jabiru 3300 motor mount

 	  Quote: 	
		   Just to be sure I understand you correctly.....  The measurements you

provided were of the original mount that was "too long", correct?
	




Yup, those are the measurements of my bad mount, the one that tilts the

engine's nose down about 2 degrees too much. That would make sense if (as

Jabiru USA says) the top tubes are 10 mm too long. I never got around to

checking the side angle.



-- Craig

Tim Juhl

Joined: 21 Mar 2006
Posts: 488
Location: "Thumb" of Michigan

Posted: Sun Aug 26, 2007 4:56 pm Post subject: Re: Out-of-spec 601XL/Jabiru 3300 motor mount

Checked my mount today..... my top tubes are about 10 mm shorter than yours so hopefully I've got a good one.



Thanks for sharing your experience!



Tim

_________________
______________
CFII
Champ L16A flying
Zodiac XL - Jabiru 3300A
Almost done! It'll fly in spring!

craig(at)craigandjean.com
Guest

Posted: Sun Aug 26, 2007 5:04 pm Post subject: Out-of-spec 601XL/Jabiru 3300 motor mount

 	  Quote: 	
		   Checked my mount today..... my top tubes are about 10 mm shorter than

yours so hopefully I've got a good one.
	




Glad to hear it. Do you have any way to measure the angle of the plane

defined by the disks at the back of the mounting pins relative to the plane

defined by the plates that bolt to the firewall? That (and the angle of your

firewall to the upper longerons) are the critical numbers.



-- Craig

Tim Juhl

Joined: 21 Mar 2006
Posts: 488
Location: "Thumb" of Michigan

Posted: Mon Aug 27, 2007 6:35 am Post subject: Re: Out-of-spec 601XL/Jabiru 3300 motor mount

As I said, my mount is not ready to be installed - I must finish the fuselage first    Other than rigging up some kind of jig I'll have to wait until I get to that point.



Tim



Do not archive

_________________
______________
CFII
Champ L16A flying
Zodiac XL - Jabiru 3300A
Almost done! It'll fly in spring!

japhillipsga(at)aol.com
Guest

Posted: Mon Aug 27, 2007 6:50 am Post subject: Out-of-spec 601XL/Jabiru 3300 motor mount

Tim, I happen to have an extra XL/Jab3300 engine mount. Depending on where you are you are welcome to use it. Call my cell at 478-731-9678. Bill of georgia

 

 

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