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Engine Mount Fabrication

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lcfitt(at)sbcglobal.net
Guest

Posted: Fri Dec 26, 2008 10:41 am Post subject: Engine Mount Fabrication

A little change of pace here.



For those who have put alternative engines in their Kitfoxes or other 

airplanes, I am curious about the techniques for fabricating the engine 

mount.  I know there are thrust offset angles etc. but how do you convert 

this into an actual engine mount.?  I am thinking of a mount for a Rotax 912 

to a Model IV Kitfox that will allow a more desirable location for the oil 

tank.



I'd appreciate any help.



Lowell Fitt

Cameron Park, CA

Model IV-1200 R-912 UL

Currently focusing on the Cockpit controlled rudder trim

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roncarolnikko(at)hotmail.
Guest

Posted: Fri Dec 26, 2008 1:29 pm Post subject: Engine Mount Fabrication

Hi Lowell as I had no complete kit  to work from I was forced to make a lot.  I used a stock cowl to locate the appropriate prop centerline. From there I hung my engine from a 4x4 that extended forward from the overhead carry through tubes.  I also braced the engine from the bottom to maintain straight and level.  I had the tubes bolted to the engine and frame then tacked the connecting tubes in place with a mig. At this point it is a foggy memorie C but I believe the thrustline is parralell to the floorboard.  An airplane will fly fine straight C but the angle if you choose to add is usually down and to the left or right depending on prop rotation.  From the cockpit view a clockwise rotation would need a slight right angle.  I can add shims if needed C but it feels fine.    100+ hours KF IV  VW redrive

 Ron NB Ore  541KF 117AF 67779  Ps glad to hear you are building something

 



 	  Quote: 	
		   From: lcfitt(at)sbcglobal.net

 To: kitfox-list(at)matronics.com

 Subject: Engine Mount Fabrication

 Date: Fri C 26 Dec 2008 10:35:57 -0800

 

 --> Kitfox-List message posted by: "Lowell Fitt" <lcfitt(at)sbcglobal.net>

 

 A little change of pace here.

 

 For those who have put alternative engines in their Kitfoxes or other 

 airplanes C I am curious about the techniques for fabricating the engine 

 mount. I know there are thrust offset angles etc. but how do you convert 

 this into an actual engine mount.? I am thinking of a mount for a Rotax 912 

 to a Model IV Kitfox that will allow a more desirable location for the oil 

 tank.

 

 I'd appreciate any help.

 

 Lowell Fitt

 Cameron Park C CA

 Model IV-1200 R-912 UL

 Currently focusing on the==================

 

 

 


	


It’s the same Hotmail®. If by “same” you mean up to 70% faster. Get your account now.  [quote][b]

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Beemer

Joined: 26 Aug 2006
Posts: 87
Location: Middle Georgia

Posted: Fri Dec 26, 2008 7:21 pm Post subject: Engine Mount Fabrication

Hey Lowell,

When I mounted my Geo to the M2, I went and bought a laser level from Home

Depot. I can't imagine doing this without this magical tool.



Basically, I mounted the engine with 2 degrees right thrust and 2 down. This

works very well in flight.



The vertical down thrust is easy - put a magnetic degree level on the prop

flange. I hung my engine from an engine hoist, and adjusted the straps to

get it tilted down.



The horizontal right thrust is harder, in that it requires public math. Se

here: http://www.gsal.org/tools/offset_calc.htm



This calculator will tell you how far LEFT to move the back of the engine to

get the prop flange centered with right thrust. It's just basic trig, but

the web app is easier for those of us who slept through high school.



Once set, build up your mount webing, and tack weld as you go. Actually, the

hardest part was checking the alignment 10,000 times as I was going. The

laser level is pure magic for this. I found a way to build up the mount

without having to fishmouth the tubing. This saved tons of time, and is

holding up very well in use. In fact, I dare say my method of joining tubes

is stronger.



Basically, Just hang the engine where you want it, and start fitting up

tubing, one piece at a time.



I hope this answers your question,

Bradley



[quote] --

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_________________
Beemer
KF2 (and now an M3!)
Suzuki G10 three-banger
Middle Georgia

patreilly43(at)hotmail.co
Guest

Posted: Sat Dec 27, 2008 8:43 am Post subject: Engine Mount Fabrication

Bradley C Would you mind elaborating on your method of joining tubing without "fishmouthing" ( I assume that is the samething as tube notching).

  

 Pat Reilly

 Mod 3 582 Rebuild

 Rockford C IL



[quote] From: bmwebb(at)cox.net

 To: kitfox-list(at)matronics.com

 Subject: RE: Engine Mount Fabrication

 Date: Fri C 26 Dec 2008 22:20:05 -0500

 

 --> Kitfox-List message posted by: "Bradley Webb" <bmwebb(at)cox.net>

 

 Hey Lowell C

 When I mounted my Geo to the M2 C I went and bought a laser level from Home

 Depot. I can't imagine doing this without this magical tool.

 

 Basically C I mounted the engine with 2 degrees right thrust and 2 down. This

 works very well in flight.

 

 The vertical down thrust is easy - put a magnetic degree level on the prop

 flange. I hung my engine from an engine hoist C and adjusted the straps to

 get it tilted down.

 

 The horizontal right thrust is harder C in that it requires public math. Se

 here: http://www.gsal.org/tools/offset_calc.htm

 

 This calculator will tell you how far LEFT to move the back of the engine to

 get the prop flange centered with right thrust. It's just basic trig C but

 the web app is easier for those of us who slept through high school.

 

 Once set C build up your mount webing C and tack weld as you go. Actually C the

 hardest part was checking the alignment 10 C000 times as I was going. The

 laser level is pure magic for this. I found a way to build up the mount

 without having to fishmouth the tubing. This saved tons of time C and is

 holding up very well in use. In fact C I dare say my method of joining tubes

 is stronger.

 

 Basically C Just hang the engine where you want it C and start fitting up

 tubing C one piece at a time.

 

 I hope this answers your question C

 Bradley

 

 > --

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