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Old Aug 06, 2013, 01:54 PM
Kansas is windy.
pburress's Avatar
Wichita, KS
Joined Jun 2003
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Anybody know anything about this wooden prop?

I recently picked up a couple of these wooden props on ebay. One is 8 1/2" and the other is 9". They have "Academy" stamped or stenciled on them.

Anybody know anything about them?
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Old Aug 06, 2013, 02:32 PM
F1B is ok.
Monheim am Rhein Germany
Joined Jul 2008
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These propellers could buy finished around 1940. They were made for rubber powered models. That's all I know. The props in the pictures I bought many years ago in a Model Shop liquidation.

Heinz
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Old Aug 06, 2013, 04:26 PM
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The windy west coast of Sweden
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Sorry, pburress, I have no idea...

Here is another wooden (rubber) prop, that I picked up several years ago. So far I haven't been able to trace its origin......


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Old Aug 06, 2013, 05:05 PM
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United States, VA, Chesterfield
Joined Mar 2001
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Made from Paulownia wood and usually made in Japan, You could still buy these in the early 50s. My Jasco (Jetco) kit had one in it in 1954. I have several in my collection and use them on my FF models. They make great props for CO2 motors (7 and 8 inch sizes). I have a 9 or 10 inch one on my 30 inch Pacific Ace and on my Jimmy Allen Parasol.
.
Pat
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Old Aug 06, 2013, 05:13 PM
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Gold Coast Australia.
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Don't waste them, build something for them.
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Old Aug 07, 2013, 02:17 PM
Kansas is windy.
pburress's Avatar
Wichita, KS
Joined Jun 2003
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Oh, I won't waste them! It just so happens that I am very near completion on a 24" Flying Aces Moth. Got the thrust bearing in the noseblock last night and about the only thing left is a propeller and some covering trim.

To hijack my own thread, would you suggest the 8/12" or the 9" for the 24" Moth? And while I'm at it, what would be good for rubber? Three loops of 1/8"?
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Old Aug 07, 2013, 04:38 PM
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Quote:
Originally Posted by pburress View Post
Oh, I won't waste them! It just so happens that I am very near completion on a 24" Flying Aces Moth. Got the thrust bearing in the noseblock last night and about the only thing left is a propeller and some covering trim.

To hijack my own thread, would you suggest the 8/12" or the 9" for the 24" Moth? And while I'm at it, what would be good for rubber? Three loops of 1/8"?
I should think the 8.5in would be plenty big enough, and 4 strands X 10 grams of 1/8th rubber would be perfect. Don't forget to incorporate a freewheel.

My reasoning for this suggestion is that my 24in KK Achilles uses an 8in hand carved prop. with the rubber as suggested and flies so well it needs a DT.
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Old Aug 07, 2013, 04:44 PM
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Thanks! Looks like tonight, I will be bending wire to make a freewheeler. Lots of firsts with the Moth.
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Old Aug 08, 2013, 12:46 PM
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Westminster,Ca.
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My thoughts on prop size would be determined by pitch to match motor. These prefab props probably have anywhere from 1.2 to 1.3 inches of pitch. Using a ten gram motor (3 loops of 1/8th) which is about the maximum power for a Moth, I would start with a 9" prop but, that's just my experience.

Majestyk....
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Old Aug 11, 2013, 09:53 PM
Kansas is windy.
pburress's Avatar
Wichita, KS
Joined Jun 2003
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Put to good use.

Thanks again for the input. The 8 1/2" prop is on the Flying Aces Moth. I first tried a plastic prop and it was very nose heavy. With the wood prop it's still nose heavy, but less so. The Moth had it's first flights tonight and prop did fine, and the airplane did too.

The propeller is unfinished- should it be finished or sealed?
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Old Aug 12, 2013, 11:16 AM
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Roedermark, Germany
Joined Mar 2002
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If the prop is truly "bare", a coat of two of some sort of sealer is adviseable. Moisture or a total lack of it can cause unpleasant issues (weight gain /loss) for the CG. Sealing the prop effectively reduces those issues. Also can help reduce chipping.

I also have two of the Aero Blitz props - 12" and the 6". Don't know whether I'll use them on anything, as they are a bit too heavy for my taste. Beautifully made, tho.

Pete
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Old Aug 12, 2013, 11:26 AM
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Westminster,Ca.
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Great looking Moth. I would at least put a coat of dope or another product to add some sheen and strength. Keeping in mind you are already nose heavy. It's your call. How much rubber are you using for your motor?

Majestyk....
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Old Aug 12, 2013, 11:39 AM
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Hey Pat,
is it the "Excellent" or the Aero Blitz that is made from Paulownia wood? I did a bit of fine balancing to the 12" AB, and it was like trying to work hardend steel...

Pete
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Old Aug 12, 2013, 04:38 PM
Kansas is windy.
pburress's Avatar
Wichita, KS
Joined Jun 2003
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This motor is two loops of 1/8" which are about 1 1/3 times the nose to peg length. Modest, I know.

Actually I broke the motor after a few test flights so I will be making up another. I'm open to suggestions for a motor (three loops instead of two perhaps), keeping in mind that I want a solid performer, not necesarily a contest winner.

Any links to a good motor how-to page? Need to know the best way to do the knots etc.
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