Engine sag

[Ron B.]

I clecoed the aft edge of the engine cowl to the fuselage today. I had it jacked up with hydraulic stands under the cowl to hold the cowl in place. I has the spinner, 1/8" plus above the cowl while drilling/clecoing . Thought I had things going good until I removed the jacks and the cowl rose for some reason to almost flush with the spinner. The last thing I did after clecoing the aft edge was check the spinner location and the cowl was 1/8" lower than the spinner. I then removed the jacks and it went to almost flush. Something don't make sence?
Ron

 

[bhester]

I wish I made mine flush

I set mine about 1/8" high and after 280 hrs and a lot of rolls and loops, it is still right were I set, I've had no sag at all.

 

[ScottSchmidt]

Plan on 1/8"

I set mine flush with the top of the cowl expecting 1/8" of an inch sag which would center it exactly on the cowl and after 500 hours that is exactly where it is now.

 

[w1curtis]

I set mine flush with the top of the cowl expecting 1/8" of an inch sag which would center it exactly on the cowl and after 500 hours that is exactly where it is now.

Scott,

What was the spacing used for that wood disk from the face of the ring gear? I calculate 1 7/16" to have it right up against the cowling or 1 9/16 if used with 1/8" spacers. I don't have my prop yet and I'm about to fit my cowling. I have a 13" aluminum disk 1/8" thick and I calculate 1 7/16" PVC spacers to allow me to clamp the cowling right up against the disk.