by David HEAL » one month ago
No Video Link or SB Link shown. Nothing listed via master SB listing.
by RotaxOwner Admin » one month ago
(links added)
by Sean Griffin » one month ago
ROA,
Out of interest;
Under what circumstance would a owner/builder/mechanic use a "round-neck nut" in preference to a socket head / cap screw & nut or hex nut / bolt ?😈
by Roger Lee » one month ago
Hi Sean,
I see these inserts all the time and if I need to work on the gearbox I have to take them out. I've never had an issue taking them out or putting them back in.
Roger Lee
LSRM-A & Rotax Instructor & Rotax IRC
Tucson, AZ Ryan Airfield (KRYN)
520-349-7056 Cell
by Jeff B » one month ago
Sean,
I was also thinking about the advantages and disadvantages of using these round neck nuts vs. the drive bushing with a hex nut behind it. My aircraft uses 8mm hex nuts (fiber type locknuts) behind the hub. I have a friend with the same SLSA aircraft that is a few years newer, and it uses the round-neck nuts. We also both run Duc Helices Flash propellers with an approximate 2" spacer, so the bolts are about 6" long.
On my aircraft, checking the torque is done at the hex nut behind the propeller hub, whereas on his aircraft it's done at the front of the prop since the round-neck nuts are fixed in place. In both cases, you need to pull the spinner so you can hold (or torque) the bolt. I have the box end type crow's foot for reaching the nut behind the prop hub with a torque wrench, but it's easier checking the torque from the front bolt head, which you can only do if you have the round-neck nuts installed. On the other hand, I think torquing the nut itself is more accurate than torquing the bolt from the head side, especially with the longer bolts that will have a bit of a twist spring back. I think this is just a choice, and I don't see a big advantage wither way.
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