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
Ø2 3/4 aluminum rod is pretty available. Here is a 4" long piece: https://onlinemetalsupply.com/2-750-2-3-4-inch-6061-t6511-aluminum-round-rod/ It's easy to drill a Ø1 1/4 hole through it if you have
Author: Mpridesti via TowerTalk <towertalk@contesting.com>
Date: Sat, 8 Jun 2019 15:44:41 -0400
Jeff Should be no issue using dramatically different diameters and I believe modeling programs will give the additional length required for resonance. Anytime you have a step in diameter, you have le
I should have been clear. This is a question on the MECHANICAL side - some sort of physical transition between sizes. Not a modeling issue. SOrry for the confusion! 73/jeff/ac0c alpha-charlie-zero
I don't think you will find any stock that fits without machining id & od. An easy job in a 12" lathe. 3" solid 6061 round bar is the place to start from ebay or your local rem store. 4pcs x 3" Thru
The od spec for bar is usually not slip fit accurate or is extruded bar that round, so it will likely need turned to fit. The standard mill spec for that size is +/- 0.024". Might be lucky tho with t
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
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
Jeff, I found when building my 40 meter 4-square weight was a big problem when raising and lowering 32-34' verticals. I bought my tubing from DXEngineering, mostly 0.120" thick wall aluminum. But the