Grant sez...
There is no benefit to having the saddle extend further than the DXE
single saddle clamps as there is no force from the U-bolt to provide
clamping force. If more clamp is needed, there are the DXE "super-duty"
saddle clamps with two saddles and through straight bolts.
## The correct component for the job is the DXE “super duty”
saddle clamps. I use 2-3 of these to clamp the chromolly mast to the
8” tall x 18” wide x .375” thick 6061 T6 plate. I use TWO identical
plates, with one horizontal and one vertical. ( same idea as the F-12 double
plate scheme, except done right). The super duty clamps are used on the vert
plate
and the regular DXE saddle clamps are used to clamp the boom to the
horizontal
plate. This is for a 2” OD x .375” thick chromolly mast. (107 ksi).
## I also use those DXE .....”super duty” mast clamps for my HB mast steps.
One
super duty clamp is used with a 2. x 2” x 14” long x .25” thick 6061-T6
angle AL.
2” wide non skid stuff is applied to both vert + horz portions of each mast
step.
## The K7NV small prop pitch + his superb mast clamp is used for the rotor.
## Since both plates are identical, and are 8” x 18” wide, with one vert
and one horz,
where they overlap forms an 8 “ x 8” square. ( = .75” thick) . The
horizontal plate is shifted
down slightly, so that ONE DXE “super duty” mast clamp is at the bottom of
the vert plate,
.... and TWO of em are mounted at the top of the vert plate.
## The DXE “super duty” mast clamps use a pair of G-8 armour plated
bolts.
http://www.dxengineering.com/search/department/clamps-and-fasteners/product-line/dx-engineering-super-duty-saddle-clamps?autoview=SKU
http://www.dxengineering.com/parts/dxe-sdsbolt-5 bolts come in various
lengths, and don’t rust.
You can also use the “super duty “ mast clamps to mount a boom to the H
plate if you want.
Do it this way, and the clamp cant slip on the mast..even in 120 mph winds.
use thread locker..after using the TQ wrench to dial in correct TQ.
Where each boom is, I use em as climbing steps..since there are 3 of the dxe
super clamps.
If you folks torque balanced your ants correctly, you would eliminate 90% of
your TQ problems.
As a side note, ALL my F-12 u clamps have rusted out (used to hold the
eles to the F-12 boom bracket).
I replaced dozens of em with SS DXE saddle clamps...end of problems.
Later... Jim VE7RF
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