form fits function
Scale down a Rotorway head or an AW head they both do the same job

Seen a Chadwick helicopter 4 bladed head that had a strap pack like a Hughes 500 16 ft rotor span an ultra lite
Seen a strap pack like a bell Jet Ranger on two styles of ultra lite helicopters

AW 95 with Doug Swickerd had a Solar turbine .

Most ultra lite helicopters are flown by hobbyists and don't fly like a heavier machine at higher altitudes .

Here's an old site with big sources
http://aviastar.org/index.html

The MD 500 not only a strap set up but had a spherical bearing riding on a pin to keep the flapping & feathering at the same point. Both the Huey and 206 had strap packs with needle bearings riding on the yokes

early scorpions had double ball bearings for flapping and feathering on a trunnion [teeter/rocking] with collective cable linked to both grips -

A Teleflex cable to swash plate and a collective system with head of an exec scaled down is good

Scale according to design loads smaller by 20 percent will that afford the safety margin ?

keeping the loads scaled too? Less gross weight less horse power

material load will dictate size. [Aircraft Spruce Catalog has nice material strength charts]

As with any project what materials, what mission. what monies.

A standard of X3 on most areas will do
X7 for critical single point failure points like TT straps , Latch bolts and pins, Rescue hoist cables...

Looking good

If you can give it an easy daily inspection before flight the 1.5 will do too.

Thrust loaded ball is okay even a mix of what's needed for span wise loads, chord wise loads and lifting loads.

Hughes 300s, Sikorskys, and Robinson use a bearing stack up of multiple bearings - Tension and feathering uses

A Rotorway had two bearings for collective thrust loads [tension feathering for collective only]and a set of gimble bearings for cyclic feathering and flapping (lower cyclic loads adding to bearing life) [AKA Bell 47]

A heavily loaded bearing will cycle out and bind in the races ratcheting with higher break away loads that feed back to the control stick.

Heavier loads = higher costs

Enstrom Helicycle and the Rotorway went to an elastimeric thrust bearing

Bell 47 had a massive bearing for thrust loads -
You could use a propeller thrust bearing or a scaled down bearing ie: Big Balls and races...More contact surface area

thank you murray, what I would need is to locate all of those bearing on the rotorway rotorhead

with your answer I understand that the thrust bearings are in the 2 cubes located inside the oval donut ? I am right I must be the elastomeric braring right ?

what about the gimbal bearings and the feathering bearing, it is the same name for the same bearing locate at the end of the oval donut of the rotorway head ?

thank you murray, what I would need is to locate all of those bearing on the rotorway rotorhead

with your answer I understand that the thrust bearings are in the 2 cubes located inside the oval donut ? I am right I must be the elastomeric braring right ?

what about the gimbal bearings and the feathering bearing, it is the same name for the same bearing locate at the end of the oval donut of the rotorway head ?

thank you murray, what I would need is to locate all of those bearing on the rotorway rotorhead

with your answer I understand that the thrust bearings are in the 2 cubes located inside the oval donut ? I am right I must be the elastomeric braring right ?

what about the gimbal bearings and the feathering bearing, it is the same name for the same bearing locate at the end of the oval donut of the rotorway head ?