I whole-heartedly agree!
I first learned to fly gyros using this spindle type head on a towed glider. On the glider the tow line and weight of the tow vehicle tames it down a bit, but in free flight it is absolutely treacherous! The control pressure feed-back and reactions to disturbances are exactly the opposite of self stablizing. It is trying to kill you every second!
Igor Bensen knew and admitted this in is book "A Dream of Flight".
In fact I would go so far as to state that without the introduction and adaptation of the off set gimbal rotor head, the sport gyro movement would have died in its infancy.
In short, don't fool with that thing. Get yourself a good offset gimbal head. Your entire flying experience will be much enjoyable and SAFER!
Pete, I’ve never flown with a spindle head but I remember Dave Prater saying much the same thing as you.
Dave said he had a spindle head while sidekick Bill Parsons had a gimbal head; he was all over the sky while Bill looked like he was on rails. Dave claimed it was definitely not due to Bill’s superior flying skills.
I’ve built and flown rotorheads using the Shafer spherical bearing where the teeter bolt centerline passed through the center of the sphere. This amounted to the same sort of cyclic as a Bell-47 rotor where there is no component of rotor thrust fed back into the control system.
With a feedbackless head, it was a fulltime job just to stay rightside up.
But the offset gimbal head is a double edged sword. There are some very unstable gyros that give the illusion of stability. Remember the phrase; “It’s so stable it flies hands off?”
I searched for spherical roller bearings from the "major" magnufacturers (SKF etc...) and they all start from a bore diameter of 25 mm (roughly 1").
Which obviously is what I was looking for but I was surprised that Shafer seems to be the only supplier of small diameter (1/2") bore spherical roller bearings, weird.
The bearing is for the hub of a single blade rotor.
May we know what you have in mind? Hope its other then manned flight.
Mr C.Beaty's has a remarkable memory and I quote him............
"(In fact I would go so far as to state that without the introduction and adaptation of the off set gimbal rotor head, the sport gyro movement would have died in its infancy)"
There were many certified gyros when Mr Bensen offered a KIT for home builders.