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Prather Pitch Gauge

Old 11-17-2013, 11:20 AM
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daven
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Default Prather Pitch Gauge

Please see my listing.

http://www.ebay.com/itm/141116239987...84.m1555.l2649

Thanks, D
Old 11-18-2013, 05:46 PM
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skull1971
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Really Dave? thought we were better than this
Old 11-18-2013, 06:42 PM
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daven
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Better than what? Helping someone else out that can use this now that I am done with it?
Old 11-19-2013, 03:51 AM
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skull1971
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I was just hoping to get it in the "Brother-in-law" deal instead of hand to hand combat on ebay.
Old 11-19-2013, 04:27 AM
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Ahhh... I get you now... Well, that I understand, but I'm trying to maxamize my $'s..... Could really use some extra cash for Xmas and maybe a trip... Just selling off a few odds and ends that appear to be highly coveted at the moment..
Old 11-19-2013, 04:28 AM
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and not to be mean, but I really hope there is LOTS of "hand to hand" fighting over there, lol...
Old 11-19-2013, 06:36 AM
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Dave,

How much for a PDF copy of the instructions??

Trey
Old 11-19-2013, 07:18 AM
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Dave people are willing to pay real money for old stuff ???? I have one here somewhere in my "Hobby " stuff I'll have to look for it
I didn't know you could get $$$$ for old stuff haven't used it since we quit Quarter midget WOW
Old 11-19-2013, 07:21 AM
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Some are I guess Al... One of these sold on EBAY for over $100 recently... I guess some of the Control Line guys still use them, and some still use them for Q40 props... I just take em out of the bag and go...

Trey, I'll do my best to scan these in the next day or so. PM me your email.

D
Old 11-19-2013, 08:10 AM
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Add me to that too Dave, a copy of the instructions. I think you already have my email address.
Old 11-19-2013, 09:52 AM
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I founed it !!! A little dusty but still usable
Old 11-20-2013, 01:11 PM
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Mines up to $177.00 Al, with several days to go... Better get yours listed
Old 11-20-2013, 01:23 PM
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Actually, make that $280 now, wow...
Old 11-21-2013, 03:04 PM
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A $1.29 and a bit of trig will get just as good an angle.
Old 11-21-2013, 03:46 PM
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yeah, but if you're SELLING the pitch gauge, 280 is pretty darned good!

I still have one that I think is NIB, might hang on to it a while longer.. it seems they must be made of unobtanium.
Old 11-21-2013, 04:49 PM
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I always thought the Prather must have found the design from overseas. The bed is metric (centimeter spacing) while the gage is in 3 grains of barley.
Old 11-21-2013, 07:00 PM
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So what would a guy use to measure pitch while trying to mod up a prop to a 13x15 or maybe a 12x16?
Old 11-23-2013, 08:23 AM
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Shawn,

You can make a very good pitch gauge for not too much cash with a protractor. The Prather gauge was not all that accurate, as you could skew the measurements by a number of ways.

To build a prop gauge, I would start with a good digital protractor like this General Tool model for $30.

http://www.generaltools.com/1702--DI...OR_p_1245.html#

Next you need a measurement board. Use a flat sheet of aluminum, about 1/4" thick or maybe slightly thicker plastic that is a bit longer than the largest prop you want to measure and maybe 4 to 6 inches wide (It will need to be pretty wide to measure flatter angles at the tips of props).

Drill and tap on one end for the different stud sizes of the props you want to use. Might be three or more sizes, but if you run out of room on one end you can also use the other end too.

Finally mill or cut slots through the board for the protractor arm to go through the base at the spacing you want to measure. As I said before, the Prather unit's station spacing was in cm, so if you want a direct comparison to a Prather, go with that.

To use, mount the prop using a short thread or bolt to the base. Insert protractor from the other side and take a measurement. Do the math to find out the inches of pitch at that station.

If you find out that one blade is higher or lower than the other, don't change the blade, change the hub. If the front and the back of the prop hub is not exactly parallel, then it's a good chance that blades won't track in pitch. You can scrap the rear of the hub with a single edge razor blade to get them right with each other. Then go ahead to change each blade as desired.
Old 11-23-2013, 10:18 AM
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Thanks Bob, pretty much what I was thinking. The thing that I didn't think about was adjusting the hub. The goal is to see how small a dia I will have to go to get a YS 115 to spin a 15 or 16 inch pitch prop at 10k. Then decide if the airplane is clean enough to use the prop. I need to end up with an airplane that is close to 190 mph. Wings are getting sheeted this weekend.
Old 11-24-2013, 04:09 PM
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$330, wow.. shipping tomorrow, thanks!

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