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Author Topic: Peanut Prop/Rubber  (Read 430 times)
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ah2630
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« on: October 29, 2015, 01:59:02 PM »

What prop size and rubber (size/loops/length) are you using on a outdoor peanut?
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Bredehoft
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« Reply #1 on: October 29, 2015, 02:11:44 PM »

There is no one-size-fits-all answer.

Every model is different. And I mean every individual built model is different.

Depending on the size and weight of the model, you can expect the props to be between 4" and 7" and the rubber between a single loop of 1/16" and 2 loops of 1/8".  (those are real-world, I've-seen-it values)

Can you narrow down your question?

--george
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ah2630
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« Reply #2 on: October 29, 2015, 02:32:35 PM »

Thanks for the reply.

On a Mooney SE5 a 6" prop with one loop of 1/8 seems to work fine.  I scaled down a Pacific Ace and a Prairie Bird to peanut size and a 5" prop with a  single strand of 1/8 seem to work best.  Now those two are lighter than the SE5 so I understand the differences there.  I guess what I am trying to figure out is what characteristics am I looking for in the design which will give me a good starting point on the prop and rubber combination.
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« Reply #3 on: October 29, 2015, 02:45:23 PM »

Fair enough.

For my brand new peanuts, I usually try to get them flying on a 5" prop and 3/32" loop.  Invariably, my friends tell me I need more power.  Depending on the plane and what I see with that set up, I will sometimes go up to a 6" prop, hoping to up the duration.

I would only go to 1/8" rubber for larger and heavier Peanuts.  But this is me, others add more rubber. 

I currently have 3 working Peanuts:  2 with 5" plastic props, one with a 5.5" wood prop.  2 of them fly on a single loop of 3/32" and one flies on a lopp of something jsut over 1/16" - something like .080".  All three of these planes have won contests.

--george
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Tapio Linkosalo
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« Reply #4 on: October 29, 2015, 02:59:18 PM »

I would only go to 1/8" rubber for larger and heavier Peanuts.  But this is me, others add more rubber. 

I second that.

Many years ago I started trimming a new Lacey, quite a heavy one at 12 grams. So for 5" prop I opted for 1/8" rubber. Struggled for a while, until a more experienced friend pointed out that overpowering the model only makes trimming more difficult. Switched to 3/32", and right away things started to get sorted out. So I would err for the thinner side of rubber to start with, and only go thicker if modes gets trimmed but is underpowered.
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