[landsailing] Re: Scale to measure forward thrust from the sail
- From: Robert Allyn <allyn@xxxxxxxxxxxxx>
- To: landsailing@xxxxxxxxxxxxx
- Date: Wed, 25 Jan 2006 05:15:46 -0800
Any chance you could bring one or two to the next event 2/4 so we could do some
testing of this idea?
- Tad
At 10:09 PM 1/24/2006, you wrote:
>Yeah. I have some spring force scales that can read in ounces or Newtons. I
>suspect we'll need low-range scales - I think the force will be on the order
>of 1 Newton or so (that's the weight of a 100g mass).
>
>Nick
>
>
>-----Original Message-----
>From: landsailing-bounce@xxxxxxxxxxxxx on behalf of Robert Allyn
>Sent: Tue 1/24/2006 10:08 PM
>To: landsailing@xxxxxxxxxxxxx
>Subject: [landsailing] Re: Scale to measure forward thrust from the sail
>
>No worries. Is there a scale that would work well? Do the schools have any?
>Any recommendations on supply places to look at?
>
>- Tad
>
>At 10:01 PM 1/24/2006, you wrote:
>>Nah. It was a case of not reading carefully. Do it your way.
>>
>>Nick
>>
>>
>>
>>-----Original Message-----
>>From: landsailing-bounce@xxxxxxxxxxxxx on behalf of Robert Allyn
>>Sent: Tue 1/24/2006 8:34 PM
>>To: landsailing@xxxxxxxxxxxxx
>>Subject: [landsailing] Re: Scale to measure forward thrust from the sail
>>
>>Nick,
>>
>>Not sure I understand your logic. The wind is going to push the boat forward
>>right. The boat would be at an angle to the fan as if it was sailing. So we
>>would want the brick and scale at the back of the boat, tied onto the end of
>>the boat. Am I missing something?
>>
>>- Tad
>>
>>At 10:34 AM 1/23/2006, you wrote:
>>>A force scale mounted on the front of the boat (as the boat faces into the
>>>wind) should do just fine. Essentially, you'd be measuring how much the
>>>boat pulls on the force scale as a result of the wind pushing on the boat.
>>>You'd just want to make sure that whatever apparatus you use to hold the
>>>spring scale in place doesn't interfere with the wind too much. I'd say you
>>>could probably attach the upwind side of the scale to a red brick laid flat
>>>and the other end (via a string) to the front wheel of the boat.
>>>
>>>Nick Cabot
>>>Nathan Hale High School
>>>
>>>-----Original Message-----
>>>From: landsailing-bounce@xxxxxxxxxxxxx
>>>[mailto:landsailing-bounce@xxxxxxxxxxxxx]On Behalf Of Robert Allyn
>>>Sent: Monday, January 23, 2006 10:15 AM
>>>To: landsailing@xxxxxxxxxxxxx
>>>Subject: [landsailing] Scale to measure forward thrust from the sail
>>>
>>>
>>>Greetings List Members,
>>>
>>>Great to see everyone at the event. I have a problem without a solution at
>>>this point. Maybe you can help.
>>>
>>>I want to be able to put a boat in front of a fan and measure the forward
>>>force generated by the sail at different sail trim. I want the drivers to
>>>see how to get the most forward thrust from the sail at different points of
>>>sail. (i.e. move the boat into different angles to the fan)
>>>
>>>I am thinking we could just hook a fish scale type of device to the back of
>>>the boat and read the numbers as the sail trim is adjusted. Any ideas what
>>>device would be best for this task? I don't know what is available on the
>>>market, or what we could borrow.
>>>
>>>I think we need to do a test to get a feel for the maximum force we would
>>>expect so we know the range of values we need to work in. Ease of use is
>>>obviously important. As we have 5 fans and 5 teams right now, I thought
>>>each team could take a fan and measuring device and test their boats. As
>>>the sails would be different on each boat (if only slightly) it might give
>>>some insight to sail design as well. What if you use a mast with cardboard
>>>taped to it? Does it generate more force?
>>>
>>>Lots of ideas. Need to figure out how to measure the force first.
>>>Suggestions??
>>>
>>>- Tad Allyn
>>>(the "fan" guy)
>>
>>
>>
>>
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