4a084 Lexl update

[XL-C-100]

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.

[Steve]

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

[XL-C-100]

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!

[Steve]

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...