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Post  Cox International on Fri Feb 22, 2013 5:13 pm

Below a pic of 3 different reeds.

On the left is your classic OEM Mylar reed.

In the middle is one that is more opaque. I seems a bit stiffer.

The one on the right is transparent, like glass. It is much softer.

Any idea what the two latter ones are?

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Post  pkrankow on Fri Feb 22, 2013 5:26 pm

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Post  Cox International on Fri Feb 22, 2013 5:49 pm

The two left ones are definitely Mylar. The one on the right I am usure of. It's also softer. I'm pretty sure it's also an OEM product.

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Post  pkrankow on Fri Feb 22, 2013 5:55 pm

That changes things up quite a bit. I wonder if vinyl or eisenglass was ever used?
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Post  Admin on Fri Feb 22, 2013 6:11 pm

The Mylar reeds in most of my engines are more like the middle one in your pic, an opaque white color. How about Mylar star reeds for .049s? I bought a lot of 10 from who I believe was Dan Sitter on eBay some years ago. I have put most of them to use, recently gave one to Jason_WI. I seem to like them better than the rectangular Mylar reeds.

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A Pee Wee .020 Mylar Star Reed, .049 Mylar Star Reed and a .049 Rectangular Mylar Reed.
(not the best photo to show opacity with its white background)

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Post  pkrankow on Fri Feb 22, 2013 6:13 pm

I just recall I pulled a very transparent star reed out of one of my engines and put in an oblong reed.

I wouldn't be surprised if it is a material source or supplier change situation.

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Post  RknRusty on Fri Feb 22, 2013 8:33 pm

There is a guy on RCG selling clear ones like that, that he cuts himself. Someone posted a link a few days ago.

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Post  stevej on Sat Feb 23, 2013 12:46 am

The middle ones look like Davis Diesel Tef-Reeds. (teflon)
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Post  tru168 on Sat Feb 23, 2013 8:20 am



I think I have one cox engine with transparent reed in it, which looks just like the third one. it looks like glass and can be bend a little , but brittle. its called MICA sheet, which is the same material as isolator for early TO-3 type power transistor in home stereo.






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