JPXman @ Jan 8 2010, 09:30 AM wrote: i don't fly with rotax's, but shouldn't you have a "crush" plate on the front of those props? shannon?
those spacers will put point loads on those props that will lead to cracking. do you have a plate that just isn't on there right now?
Tyler
Tyler that's the late standard factory set-up with small washers and no crush plates. What you see is actually the revised factory prop mounting as originally the bolts were turned the other way with the nuts on inboard side of the prop hubs. Tech update 5.4 covers this.
I've seen a few examples were crush plates were made and used for Bi-props. This factory set-up however has been used on many planes for many years. Due to the hardness of the Bi-props evidently it was felt that no crush plates were needed.
Personally I think guys should adopt and utilize whatever configuration they are comfortable with for the Bi-props. Crush plates or large/oversize washers being possible options.
Where I absolutely will be using crush plates is with the P-tips.
You do not have the required permissions to view the files attached to this post.