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Unread 15-08-2012, 19:30
orvie6 orvie6 is offline
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Join Date: Aug 2012
Location: Toronto, Ohio
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using model aircraft digital optical tach on full sized aircraft

Hello, I am new here and have a question about an optical tach.. I have and use a small handleld digital tack on my model aircraft..this is usually held within a foot of the spinning prop and the rpm is displayed on the LED panel. The photocell for this tach is in the top of the insturment and is pointed toward the prop.
I want to make a Tach for a full sized homebuilt aircraft and was wondering if it is possible to get an accurate reading if I physically move the photo cell to a point on the cowling of the aircraft (within about a foot of the spinning prop) by using a long lead from the photo cell to the circuit board? I am hoping to mount the model airplane tack on the insturment panel by velcro and have the photocell wire equipted with a plug to make the tack removable without much trouble.. the tach is powerd by 2 AA batteries.
I plan on putting the photocell in a small tube to shield it from surounding light and have it 'focus' on the spinning prop..
Will this work?
Thanks.
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