The 21st Century learning experiences gained as the community, school and businesses design, plan and build a 32 foot long Town Lattice Truss covered bridge for the Village of South Wayne, Wisconsin.

## Friday, October 8, 2021

### LOTO 101 for KidWind Turbines

## Tuesday, August 31, 2021

### Gin Pole Calculations for Tilt Up Tower

This post is meant to be for the KidWind team that wants to go the extra mile and learn a bit more about the process and keep the engineering going. So what goes into designing and planning a tilt up tower for a 300 watt Air-X wind turbine?

I hear or read, I forget. I see or watch, I remember. I do it, I understand!

This will be about a guyed "tilt-up" tower. The big question. How strong is strong enough? Design and build your system to stand up to 50 m/s (110 mph) max force wind (worst case) with a safety factor of five and you will be able to sleep through any weather event!

Lets look at the F.A.T. (Frontal Area of the Tower) and swept area of the turbine. At 50 m/s you can count on a force of 250 kg/square meter of area to the wind.

We have a .1m wide by 6m tower = .6 sq/m and a .6m radius rotor on the Air-X = 1.13 sq/m

Total FAT = 1.73 sq/m x 250 kg = 432.5 kg (951.5 lbs) force at 50 m/s (110 mph) wind velocity. Times the safety factor of 5 means designing it to withstand 2162 kg (4757 lbs) of force.

This will help decide the rigging and anchor sizes needed for the tower guys.

Now the raising of the tower is another story...

In our example with a 6m (19.5 ft.) tower weighing 17.27 kg (38 lbs) and 11.36 kg (25 lb) 300 watt turbine for a total weight of 28.63 kg (63 lbs) you could probably just "muscle" the tower up to vertical and tighten up the guys. However this will help prepare you for bigger projects.

Anyway you need to think about the forces at play when you try to lift a hinged tower, to vertical, with a weight at the end of tower by pulling on a rope.

First, understand that lifting a 28.63 kg (63 lb) weight straight up with a rope would require a force of 28.63 kg (63 lbs)

Second, understand that lifting a weight by pulling at an angle is going to require more force than the weight of the object (the pole and turbine) you are lifting.

Third, the angles of the lifting rope to the weight determine the fore you will need to lift the tower and turbine.

The vertical line in the drawing represents the gin pole. The force will be brought down to the ground level (thick black horizontal line) forming another angle that will also impact the winching force needed to raise the tower and turbine from horizontal to vertical.## Thursday, August 19, 2021

### Wind Turbine Guyed Tower Raising with 300w Air-X

So what you see here is a 300w Air-X 12 volt DC generator mounted on a 6 meter guyed tower with an NRG micro site Wind Explorer Data Retriever attached to the tower.

Now if you are involved with KidWind or interested in learning the process and just what is involved in designing, rigging and raising a guyed tower like this then read on...

The goal in this posting is to show you the process and give you the leads for more research into the details that are required to have a SAFE and SUCCESSFUL project resulting in a raised wind turbine tower that produces electricity.

TBA (TO BE ANSWERED) Size of anchor needed for load capacity required and soil class (NRG booklet page 37) to handle that load?

## Wednesday, June 30, 2021

### In Floor Heating of Cabin #6

Decided to go all in as they say and put electric floor heating in the cabin. As the cabin is built on a concrete slab this should make a big difference in the winter comfort level and enjoyment of the cabin.

I decided to lay down 3/4" of foil faced insulation on the concrete floor as a thermal break to the cold.## Wednesday, June 23, 2021

### Treehouse Phase V - The Enjoyment Phase

OK so with the reassembly phase complete it was time to put on the rubber membrane roof material. It was a calm day so I took advantage of it.