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Author Topic: 4a084 Lexl update  (Read 5943 times)

Offline XL-C-100

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4a084 Lexl update
« on: April 08, 2016, 08:02:28 PM »
I thought I would put an update on my progress on my Lexl with a 4a084 engine. I have finally fired up the engine and it seems to be running great. Rebuilt the carb and modified the main jet with a #59 drill bit. Haven't had time to tie it down so I can run it at full throttle. I went with a 56 x 26 prop, hope to see 3200 rpm. I will post more as crawl forward with my progress.

Offline Steve

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Re: 4a084 Lexl update
« Reply #1 on: April 09, 2016, 06:01:14 AM »
I thought I would put an update on my progress on my Lexl with a 4a084 engine. I have finally fired up the engine and it seems to be running great. Rebuilt the carb and modified the main jet with a #59 drill bit. Haven't had time to tie it down so I can run it at full throttle. I went with a 56 x 26 prop, hope to see 3200 rpm. I will post more as crawl forward with my progress.

Nate,
Good looking build... Tell us a little bit about making the motor mount and other items that you have uniquely added or subtracted...
Steve

Offline XL-C-100

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Re: 4a084 Lexl update
« Reply #2 on: April 11, 2016, 10:01:00 AM »
The motor mount design is based off of what I could see of Les Smoot's mount. I used 5/8 .049, I also added some heavy aluminum angle across the front and on each side for the attachment points. I started by making up 8 spools, mounted 4 to the corners of the fuselage and welded 4 into a tray. I then mounted the tray to the engine and got everything level and squared up. I wanted to have the motor on because the tubes that come down at an angle on each side get pretty close to the cylinders. After everything was in place I tacked it together, removed the engine and finish welded. 

Other than the mount I haven't change much yet but I worry about balance and adding weight to the tail. I didn't weigh my engine but should be around 125 lbs, we will just have to weight and see. I have a 7lb weight made that bolts onto the tail spring just to keep the tail down without the wings on. 

I am cautiously optimistic!

Offline Steve

  • Steve Kiblinger
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  • OS:
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    • Legal Eagle serial #33
  • Eagle Type: Legal Eagle(LE)
Re: 4a084 Lexl update
« Reply #3 on: April 11, 2016, 02:09:00 PM »
The motor mount design is based off of what I could see of Les Smoot's mount. I used 5/8 .049, I also added some heavy aluminum angle across the front and on each side for the attachment points. I started by making up 8 spools, mounted 4 to the corners of the fuselage and welded 4 into a tray. I then mounted the tray to the engine and got everything level and squared up. I wanted to have the motor on because the tubes that come down at an angle on each side get pretty close to the cylinders. After everything was in place I tacked it together, removed the engine and finish welded.

Other than the mount I haven't change much yet but I worry about balance and adding weight to the tail. I didn't weigh my engine but should be around 125 lbs, we will just have to weight and see. I have a 7lb weight made that bolts onto the tail spring just to keep the tail down without the wings on.

I am cautiously optimistic!

When you dial in the CG, shoot for 30% of Chord measuring from the leading edge of the wing along the bottom of the root rib...

 

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