Ron,
I have attached a picture of my electronic torque meter. There is a balsa baseboard which clamps to my table when Indoor flying. My digital scale sits on the back of the baseboard with its lid open. A square of hard wood is glued at the front of the baseboard and a plywood bearing is stuck to each side of the hard wood. A piece of wire runs in the bearing holes. The right hand end, as you look at the picture, is bent to form a hook to take the end of the rubber motor which is being wound, the other end of the wire is bent to make an arm that will touch near the centre of the weighing platform. The only technical part of the whole job is getting the length of this arm correct so that the load in grams appearing on the scale display represents inch ounces of torque (or whatever units you like to play with). As you can see that probably took me all of 90 minutes to knock together and is as rough as a bears bum and even though it does the job it is not something to display with pride. If you buy a torque meter I think you will find something much neater and more convenient. The scale will probably have been dismantled and the components rearranged so that the scale is easier to read. Money spent on good tools and equipment is rarely wasted.
John
From: Indoor_Construction_at_yahoogroups.com [mailto:Indoor_Construction_at_yahoogroups.com]
Sent: 16 January 2017 23:41
To: Indoor_Construction_at_yahoogroups.com
Subject: Re: [Indoor_Construction] Re: ANALOG VS DIGITAL TORQUE METERS.
Any chance of your device becoming public knowledge, parts list, circuit board, etc?
On Monday, January 16, 2017 9:04 AM, "mkirda_at_sbcglobal.net [Indoor_Construction]" <Indoor_Construction_at_yahoogroups.com> wrote:
Looking strictly at the way I wind and use a torque meter for F1D:
Digital meters are superior.
Each motor is separate and is marked with expected max turns and torque.
I stretch out the motor and I cannot even see the meter face - in a sense it doesn't matter.
I wind out ~50% maybe 60% of the turns and start coming in slowly.
I sense from the tension when I should be moving in.
About halfway back, I can see the meter face. I already sort of have a feel for what it should be. The meter just confirms this and I can make adjustments if needed: i.e. come in faster or stretch back out a bit and wind more.
Rate of change is somewhat important, but this is only at the very end IMO.
i.e. after you dock the winder and are putting on the very last turns. Or even backing off a bit for a specific launch torque.
If your band is calculated to a max torque of 0.4, and you dock the winder at .38, you really only get one or two more turns anyway. Real turns, not winder turns typically. But you know exactly where you are, with much better resolution than an analog winder.
Regards.
Mike Kirda
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Received on Mon Jan 16 2017 - 17:38:19 CET