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  #61  
Old 04-29-2022, 09:52 AM
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Couldn't sleep so did some ciphering early this morning.

The complete motor weighs 80 lbs and the top of the tower at 16.25' weighs in at 90 lbs.

That gives a combined load of 170 lbs and will require a moment of 2763 ftlbs to pull it upright.

The gin pole is 8' long but at an angle of 8°, so an effective 7.92'.

2763 ftlbs / 7.92' = 349 lbs horizontal force.

The winch is pulling from the ground at 17.3°.

349 lbs / cos 17.3° = 365 lbs.

To verify, the angle from the end of the gin pole to the top of the tower is 27.65°.

170 lb / sin 27.65° = 366 lbs.

The tension of both lines match close enough.

The winch is getting a new rope. There is only enough room for 25' of rope on the drum so there will be a long tail that won't get wound up. That won't be a problem for raising the tower.

If the tower is ever brought down, I'll need to remember to have a full drum with a long tail before lowering.
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  #62  
Old 04-29-2022, 11:25 AM
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Thanks for posting your math sheet. I can’t quite remember those problems from high school math classes, but I probably did something similar. Just not using that education for 32 years makes it a bit fuzzy in my brain.


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  #63  
Old 04-29-2022, 01:30 PM
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Some other ways to skin the cat

Generally the A frame he has fixed upright is attached to the tower and when the tower is vertical the A frame is on the ground horizontally
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  #64  
Old 04-29-2022, 08:38 PM
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Quote:
Originally Posted by Ironman View Post
Some other ways to skin the cat

Generally the A frame he has fixed upright is attached to the tower and when the tower is vertical the A frame is on the ground horizontally
That is what my "gin pole" is doing, rotating with the tower. I put my A at the bottom and braced it so the downward load is carried by the braces.

Went another direction today. Some of you probably picked up that the platform weight is missing, so the platform got built today.

Reworked the math and the end result is a 420 lb pull from the winch.

The platform effective wt:

33 lb / 16.25 * 12.1 =25 lb at the end of the mast, so that is added in to the 170 lb already there.
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Bill in sunny Tucson

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  #65  
Old 04-30-2022, 08:24 AM
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From what I know, if your mast is strong enough to withstand the forces in raising, it will hold up in long term service. There is a lot going on in raising and lowering that does not happen in service.

In the oil patch, you raise and lower masts frequently. Sometimes, several times a day.
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  #66  
Old 05-02-2022, 07:48 PM
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It all came together today. Now for the bad news. I need to make new spokes.

I mentioned early on that the threads on the spokes were #14-20 instead of the 1/4-20 that I had intended. As I was doing the final tightening of the wheel, one of the spokes wouldn't tighten and slipped instead. The proverbial "stripped thread" but the threads are intact.

So what is the difference between #14-20 and 1/4-20? About .008", which is about 25% of the thread depth.
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Last edited by arizonian; 05-02-2022 at 08:05 PM.
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  #67  
Old 05-04-2022, 09:00 PM
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New spokes have been made.

Spokes consist of 1/4" HR threaded both ends, a nut and a sleeve. Nut and sleeve are silver soldered on one end.

Test spoke on the left, setting up the remaining spokes for soldering.

Complete.
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Bill in sunny Tucson

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  #68  
Old 05-06-2022, 03:57 PM
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Default She's Flyin'

Stood the windmill up this morning. Cranked easier than I thought it would.

The first casualty happened while it was still on the ground. I was adjusting the furling arm at the base and my BIL was holding the tail. Pulling on the lever with the tail held stationary meant that the motor had to lift and the rods were not strong enough and buckled. After mulling it over a bit, decided to lift it anyways and do the repairs later. After it was stood up, the bent links were removed, straightened and reinstalled. With the tower standing up, it takes almost no effort to furl the sail.

Bent rods.

Getting ready to lift.

Shot of the boat winch.

Halfway there.

Standing tall.

I'm going to let it stand at the machine shop for the next week or so before dismantling and moving it to my house.
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Bill in sunny Tucson

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Gun Control: The ability to consistently hit what you are aiming at.

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  #69  
Old 05-08-2022, 06:54 PM
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Still working on little parts.

Stop for the furl lever in the upright position.

Hinge for the furl lever.

Stop for the furl lever in the closed position.

Small parts for the sucker rod swivel. The rod of choice is 3/8" HR. I can build an adapter when I get the rest of the pump.
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Bill in sunny Tucson

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Gun Control: The ability to consistently hit what you are aiming at.

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  #70  
Old 05-23-2022, 09:47 PM
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Default She's Home!

Friday/Saturday pulled the windmill down, disassembled and transported it to the house. Put everything back together and with the help of the wife cranked her back up in the air. While assembling the motor to the tower started to get a bit of vertigo, but it passed quickly. Climbed the ladder, added oil and put the hood on.

An hour after the oil was in, started noticing droplets on the ground and the pump rod weight was wet. Seems the oil is coming down the pump rod inside of the mast. I need to pull it back down and put some kind of umbrella underneath the yoke that will shed oil away from the hole in the mast.

View from my chair in the back yard.

View from the northwest. The house sits on the first hill above the floodplain.

Front porch view, nice sunset today. The little guy really gets turned about with gusts but the big guy is a lot more stable.

Oil droplets all over the place, including on top of the "well".

View from directly below.
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Bill in sunny Tucson

I believe in gun control.

Gun Control: The ability to consistently hit what you are aiming at.

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