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engine mount

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wannafly

Joined: 13 Oct 2006
Posts: 53

Posted: Thu Jan 15, 2009 9:52 am Post subject: engine mount

anyone have a mount for a 912 ul to go on a model IV need a muffler as well. Do any changes have to be made to the cowling for it to fit.



thanks

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patreilly43(at)hotmail.co
Guest

Posted: Sat Jan 17, 2009 8:29 am Post subject: engine mount

I have one that came off of a Model 3 C if they are the same.



Pat Reilly

Mod 3 582 Rebuild

Rockford C IL





 	  Quote: 	
		   Subject: engine mount

 From: wannaflyfox4(at)hotmail.com

 Date: Thu C 15 Jan 2009 09:52:33 -0800

 To: kitfox-list(at)matronics.com

 

 --> Kitfox-List message posted by: "wannafly" <wannaflyfox4(at)hotmail.com>

 

 anyone have a mount for a 912 ul to go on a model IV need a muffler as well. Do any changes have to be made to the cowling for it to fit.

 

 thanks

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=224937#224937

 

 

 

 

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   	  Quote: 	
		  [b]

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lcfitt(at)sbcglobal.net
Guest

Posted: Sun Jan 18, 2009 10:59 am Post subject: engine mount

As mentioned before, I asked for some input from those who built their own 

engine mounts.  Fom the list, I got some information about the need for 

thrust offset.  Then a friend told me that he heard from one of the original 

Kitfox designers that there was no thrust offset in the Model IV mount.  A 

little research showed that the offset is to counteract (in part) the 

tendency of an airplane to yaw to the left during cruise from a number of 

factors.



Now I have more specfiic questions.  My first Model IV had a definite left 

yaw tendency (it was a different airplane when I finally put on a trim tab). 

I have never seen a rudder trim tab on a kitfox correcting a right yaw. 

What is the experience of the list in this regard?  Do you yaw left in 

cruise requiring right rudder?  Do you have a trim tab and if so, can you 

fly hands and feet off?  With or without a trim tab Do you yaw left in climb 

and right in descent - in other words, right rudder in climb and left rudder 

in descent (as it should be)?



Lowell

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Tom Jones

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

Posted: Sun Jan 18, 2009 2:01 pm Post subject: Re: engine mount

 	  Quote: 	
		  What is the experience of the list in this regard? Do you yaw left in 

cruise requiring right rudder? Do you have a trim tab and if so, can you 

fly hands and feet off? With or without a trim tab Do you yaw left in climb 

and right in descent - in other words, right rudder in climb and left rudder 

in descent (as it should be)? 



Lowell 	




Lowell, mine is a Classic 4 with a left hand turning propellor.  It yaws opposite all the planes I have flown with a right hand turning propellor.  I have no trim tabs and trim for level flight with a little up flap handle.



On take off when power is first added yaw is to the right, when the tail comes up more yaw to the right, on climb yaw is to the right.



In level cruse there is a slight Yaw to the right. I can sometimes fly straight and level hands and feet off with no yaw, I think it depends on weight of the load and power setting.



I haven't noticed what direction yaw is on reducing power.



As near as I can tell, the engine thrust line is straight ahead and a degree or two down.



My personal theory on the yaw in level flight is it is due mostly to spiraling slip stream.

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

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