[TowerTalk] Mounting 1.25 stinger in 3" tubing?

[Richard (Rick) Karlquist]

You can also make this assembly out of ABS to reduce
weight.  Since 1 1/4" ABS is hard to find, it may
make sense to stick with PVC for that part of it,
There isn't a big weight saving for making
the 1 1/4" part out of ABS.  Use special PVC//ABS glue.

Rick N6RK

On 6/8/2019 2:57 PM, Richard (Rick) Karlquist wrote:
> Get a 1 foot length of 1 1/4 inch PVC Schedule 40 pipe
> which will fit loosely over the 1 1/4 inch aluminum.
> Saw four lengthwise slits a few inches long in one
> end, at 90 degree spacing around the PVC.  Clamp
> this to the aluminum with a hose clamp.
> 
> Repeat above using 3 inch PVC Schedule 40 pipe which
> will fit loosely over the 3 inch aluminum.
> 
> Use standard PVC plumbing parts to connect the 1 1/4 inch PVC
> pipe to the 3 inch PVC pipe using PVC pipe glue.
> 
> Jumper around this plastic assembly with a piece of
> aluminum wire clamped to the aluminum tubing with
> hose clamps.  This provides electrical continuity.
> 
> I built six 40 meter verticals this exact way (except
> the stinger was 2 inch aluminum).
> 
> Note that the aluminum is inside the PVC in both cases,
> and you do zero machining of the aluminum.
> 
> Rick N6RK
> 
> On 6/8/2019 9:08 AM, Jeff Blaine wrote:
>> I'm rebuilding my 40m 4-sq verts and have some 15' lengths of 3" OD/ 
>> 2.75 ID tubing to use on the base end.  And for the "stinger" end, I 
>> have some tapered elements off an old yagi that are 1.25" OD on the 
>> bottom of the 17' length.
>>
>> Other than buying some concentric lengths of aluminum to step from the 
>> 1.25 OD stinger up to the 2.75 ID base tubing, any good ideas of an 
>> interposer that would take up some of the space?
>>
>> 73/jeff/ac0c
>> alpha-charlie-zero-charlie
>> www.ac0c.com
>>
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