Back some 60!years or so, I recall articles in QST where an automotive coil
spring was inserted between in the mast above the rotor to absorb transient
loads, which probably helped prevent slippage without pinning. Personally, the
only problem I have with slippage is on a Ham-M with a large 2m h-frame, which
seems to be wind induced. Knowing the the gears are fragile, I have resisted
pinning and additional clamp gadgets. Have not considered the u-bolts might be
stretching or the nuts loosening, so will follow up on that.
From Tom Holmes, N8ZM
> On Jul 31, 2023, at 8:23 PM, Donald Fox via VHFcontesting
> <vhfcontesting@contesting.com> wrote:
>
> Lloyd, Ray, et all:
> Good information all the way around. In my scenario, I have two 50 foot R45
> towers, with the bottom section 5 feet down in concrete. So, 45 feet to the
> top plates with TB-3 bearings mounted there. TT's are roughly 8 feet down
> just above the first tower joint. Ground elevation here is a bit over 1000
> feet ASL, and so no hills/mountains nearby to interfere.
>
> The V/U tower has long booms for 6, 2 and 222, while the HF tower has a
> Tennadyne T 8 right at the top plate, and a Mosely S401 40 meter rotatable
> dipole 10 feet above it.
>
> Decent wind loading, but nothing like stacked monobanders.
> The S401 is 41 feet long, The T8 is18 feet long. The V/U beams are 28 feet or
> less in length.
>
> Don N8ECH
> _______________________________________________
> VHFcontesting mailing list
> VHFcontesting@contesting.com
> http://lists.contesting.com/mailman/listinfo/vhfcontesting
_______________________________________________
VHFcontesting mailing list
VHFcontesting@contesting.com
http://lists.contesting.com/mailman/listinfo/vhfcontesting
|