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very quick way to cut and shave down props all the same size

Extreme Speed Prop Planes Discuss the need for speed with fast prop planes (Screamin Demon, Diamond Dust, Shrikes or any REAL sound breakin'''' plane)

very quick way to cut and shave down props all the same size

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Old 07-18-2003, 10:03 PM
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FlooredCOBRA
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Default very quick way to cut and shave down props all the same size

I am sure they have these out already but I found this to be very easy and cheap to do. No more hassle of shaving down then running engine to see if it kicks up on pipe over and over again.

What I did was got me a prop that was already cut and shaved down to size I needed. I had to do this the long way but only once. Then from there I found me an empty 409 cleaner bottle and cut out the flat side. I put the prop on it and traced out the shape and cut out the plastic with some scissors.

I made it the exact same as one blade on the prop. Then I made a small hole for shaft to fit through. I used my razor knife for this since it is about the same size and the crank.

Then I put my plastic template over prop and traced out the shape. Then from there I cut down and shaved until it was exact same as the template. Then I rotated the template to other blade and did the same there. After that I just balanced prop and now have the exact size I need without the pain of testing it over and over again.

I am sure they make these but this was cheap and easy, no ordering and waiting. I know this one works for my prop engine set up.
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Old 07-18-2003, 10:04 PM
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Default very quick way to cut and shave down props all the same size

another
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Old 07-18-2003, 10:05 PM
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Default very quick way to cut and shave down props all the same size

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Old 07-19-2003, 02:34 AM
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Default FlooredCOBRA....

....good idea, man.... ....that sure is a time saver.

Dave.
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Old 07-19-2003, 03:22 PM
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Default very quick way to cut and shave down props all the same size

I wouldn't suggest it, but I saw someone shave down a prop while the engine was running using a piece of sandpaper.

It was a Nelson q40 engine, and he held the sandpaper (on a block) up against the prop arc until the prop got small enough to jump on the pipe.

You won't see me doing that at 22,000 rpms.
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Old 07-19-2003, 03:50 PM
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Default very quick way to cut and shave down props all the same size

Oddly enough, this is the way I was showed, once upon a time when I
owned one of those sweet little Fox Quickie 500 .40's with the mini-pipe.

The sanding block method certainly works a charm, even if it is widely frowned upon.
It's definitely not the method to suggest those who are accident-prone.

edit--> Or anyone else, for that matter. Don't try this at home!



I've also seen those who use concrete or pavement to do the same thing.
( Some intentionally... but probably more "UN"intentionally )
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Old 07-19-2003, 04:35 PM
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Default very quick way to cut and shave down props all the same size

I use the "sissy la-la" caliper/belt sander method.
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Old 07-19-2003, 04:41 PM
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Default very quick way to cut and shave down props all the same size

Sometimes I forget....and leave the course paper on
the disc sander....

....then I have trouble getting the prop to balance....

:stupid: :stupid:
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Old 07-19-2003, 05:08 PM
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Default very quick way to cut and shave down props all the same size

Originally posted by daven
You won't see me doing that at 22,000 rpms.
In retrospect...
I did a lot of things 15 years ago, that make me feel lucky to still have all my body parts today

I don't think it crossed my mind back then... even once... that the prop could shed a blade.
Not that one ever would... but I shudder to think of what could happen if it did.
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Old 07-19-2003, 07:48 PM
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Default very quick way to cut and shave down props all the same size

Well I just got back from flying and ran that prop in picture above. After about 1 half almost or so of shaving sanding balancing I got to run it.

Out of curiosity I ran it unbalanced real quick to check numbers. and see if I was in ball park. It ran up on the pipe and ran great. After that I balanced it and gained about 100 or so RPM's I guess. Not sure may be in my head. It is really hard to say when you are using one of those crappy Hanger 9 tac's. You have to hold your mouth right to get it to read a steady number. The number went up and down so was hard to see exactly where it was.

I figured you loose some rpm's being out of balance but was cool to see some numbers. After that I took to field fueled up cranked up launched. My engine stalled and in went my prop I been working on for what seemed for ever.

That was my only prop of that size so after I broke it I made a 9 X 7 work. I used the same template and ended up shaving a hair more off to get up on pipe. But was good to have it to get in ball park. The 9 X 7 ended up running 25,300 and worked good for a quick field make. I still have a whole bunch of other props to make up. Next will be some 7.2 X 8.6 then some others.
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