UHS Spinners

[Dave S]

Ty,

I should have mentioned......on our S7 we have a ground adjustable warp drive prop and there is a 1/4" squash plate on top of the bulkhead. That may make a difference as Geowitz mentioned. I don't think the fender washers alone on top of the fiberglass bulkhead would be adequate. So our propshaft stack includes: Spacer, prop hub, bulkhead, squash plate, fender washers, AN washers, Bolts - this assembly has been stable.

Dave S

[TY2068]

Thanks guys appreciate the info. UHS advised I use a 9p which does not seem right for the 582 72" Ivo 2 blade medium ground adjust with standard Ivo hub set-up. The 9p looks better suited for the IFA Ivo on a smooth cowl plane.

Ty

[Av8r_Sed]

I had a problem with my UHS back plate. The fiberglass compressed each time I torqued the prop bolts and then loosened. This allowed the prop to operate below the specified torque, resulting in a crack in the prop blade from the bolt hole (two blade IVO). Since that time I'm running bare (well, no spinner anyway).

[TY2068]

Hi Paul, Yikes !!! That does not sound good at all ! Years back I had the opportunity to chop up a spinner on my Lazair. Seems as though a hard working Dirt Dobber built a nest inside my spinner in the matter of week or two. The massive imbalance caused it to depart on the grôund during run up... thankfully. A large hunk of the spinner wacked me in the foot. No injury but Ow-weee did that hurt.
I think I'll look around for something else. My Lazair has custom spinner attachment plates turned from T-6 Billet. The spinners themselves are molded plastic that were made by the manufacturer of the Lazair. I've operated wîth them for a huge number of hours with no problems. I may need to think of something similar for the Kitfox. After hearing if your experience I think I'd rather go ugly than loose a blade. Thanks fôr the heads up.

[Av8r_Sed]

Yeah, if I were to install one again I'd be looking for a metal back plate. Also, one with a good flange to support balace weights for dynamic balancing.

[jiott]

I am using the Whirlwind spinner and backplate (kind of spendy) which is carbon fiber. After 320 hours no loss of prop bolt torque at all.

[TY2068]

Hi Jim, what prop are you using on your 912 ?

So far looks as though the simpliest way to cover up the ugly IVO GA adjuster and locknut would be with a Skullcap spinner. So far I've been unable to figure out exactly which one and from what source.