wind blades

[nocita1]

Hello every one, I am somewhat confused about genny blades. I have purchased a ametek 99vdc and I want to fly it ,but every one has there own theory on what blades I should use . I am guessing that I have average 15 mile/hour wind any ideas would be great thank you

[Jerry]

Hi Nocita1

4 ft. blades work quite well for this aplication.

                     JK TAS Jerry

[David HK]

Four feet swept diameter (2 feet radius) blades.

These power an Ametek 40 volt motor.

David HK

[willib]

3.75 feet dia , 13 " root chord





they are designed with a tsr of 6 , 42 degrees from the blade plane of rotation, at the root.

will do 220 to 280 rpm in a 7 mph wind , lightly loaded by the old mini gen





as long as everyone else was showing off their stuff...

[luckeydog]

tlg wind power has alot of info on the ametek 99 www.tlgwindpower.com

[nocita1]

Jerry how much power will these blades make in a 10 m/h wind on an ametek 99 would it produce enough power to charge a 12 v battery

Thanks

[Jerry]

Hi Nocita1

I'm not sure about the 99 volt Ametek. The unit in the picture is a 2.5 HP 130 v. 17 amp 3000 rpm tredmill motor.

Here are my wind test #s from this unit when tested on my S-10 PU.

5 mph 30 watts, 10 mph 37 watts, 15 mph 64 watts, 20 mph 129 watts, 25 mph 195 watts, 30 mph 217 watts and 35 mph 217 watts.

The #s may be scewed from the cab over wind? But I don't think there very far off.

                           JK TAS Jerry

[asheets]

Out of curiosity, where did you get the Ametek 99 and how much did you pay for it?  They are rarer than decent wind the day after a new tower goes up.

As for your question, you've got to have blades that have enough torque to get the 99 spinning.  Fortunately, from what I've heard, the 99 doesn't need much more torque than any of the other Ameteks -- so a standard 4 foot blade will do the job.  AND, with the 4 foot jerry blade, you'll easily meet your 12vdc cutin speed of 65rpm.  Therefore, you may be able to play with this a bit; bigger blades will get you to cutin speed in less wind (theoretically).

[Jerry]

Hi Alan.

I've made some 4", 6" and 8" extension for my blades that work quite well.

Because of parts overlapping this takes my blades up to 62". I've used the 62" on a none decogged F&P and see startup around 11 mph.

                      JK TAS Jerry

[wayne]

Hey Jerry

I tried to order some blades for my F&P over xmas but got no answer back. Then I carved a wood set. Its not up yet just waiting for warmer days. But I have a 4 foot wood carved on my ametek and seems to work well. I would 2nd this how did you get a 99v ametek motor. They seem very rare and hard to find!

Wayne

[nocita1]

Hi Allen

 I got 4 of these motors in califoria, I paid 300.00 each and they have some kind of encoder in the back, what ever that does, I don't even know if I have to take this encoder off. But I do know people what them thats for sure.

 Thanks for your reply

[jimjjnn]

I used to work with robots and the encoders were used to tell the electronics the position of the robots hands and fingers. Also how far out the arm was reaching. The encoders also could tell where the hands were in their environment. The robots also had cameras to correct for minor errors. The cameras by themselves couldn't find the target at gigh speed as everything was a blur to them hence encoders were used primarily then the cameras refined the final position

[TomW]

nocita1;

Don't trash the encoder parts. You can possibly use them to sense RPM on the turbine.

Just something to consider.

Cheers.

TomW

[nocita1]

Hi Tomw

 How would you set somthing like this up to rad rpm's

[TomW]

nicita1;

It probably uses either an LED light sensor or magnetic sensor. Basically you count pulses against time. How to actually do it depends on the encoder itself and your skill at circuit building.

Cheers.

TomW

[jimjjnn]

our encoders always used IR (imfrared)emmiters and receptors

[jimjjnn]

You can also paint over the encoder disk marks very carefully with black paint, especially if the disk is glass. Leave an opening tho for the IR LED to pass light through. Makes a good rpm counter connected to a decent frequency meter. Some encoders are made of very thin plastic so watch out for the type of paint used else the disk will melt.