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prop size

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Old 12-29-2002, 04:45 AM
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strattac
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I'm flying a 60 size pattern plane with an 80 magnum 4 stroke,I am using a 12x10 prop,although I would like more verticle climb an less speed.Does anyone have any suggestions?
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Old 12-29-2002, 08:17 AM
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big max 1935
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strattac: Usually a larger diameter lower pitch will work. Depends on how much ground clearance you have. A lot of patter fliers need a lot of pitch to get lower DB`s . Try a 14/6 ,maybe13/7 or 8 .Need to try & see how it goes. This is a gray area for me ,last flew pattern 25 years ago. Good luck ,big max 1935
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Old 12-29-2002, 01:36 PM
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TerrellFlyer
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more diameter and less pitch will generally give less speed and more thrust,as big max replied,get a few and experiment
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Old 12-29-2002, 11:33 PM
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Hey folks I have a question, but first a little background. I am new to R/C airplanes, have never built or flown one....until this week. I was looking on this site at R/C buggies (have an RC10GT) and started looking at the beginner section under airplanes. Anyhow I saw where someone built a plastic plane for $12 and that the plans came from a website calledS.P.A.D. . Well I built one of those planes called a Debut but modified the wing with 4" of dihedral and put an OS .25 FP motor on it. The only prop I had was a 11x7 so I put it on. Well I know that I should not have tried to fly the plane but I was going nuts. So the day after Christmas I started it and from my back porch threw it into the air..........AND IT FLEW. I made 3 laps around a very large field that I have behind my house and cart wheeled it in for a landing.

To my question, the prop broke and since then I found that the prop size I should have used was the 9x5. I put one of those props on and threw the plane into the air and it was a totally different plane. I could not fly it because it was much faster and harder to control.....lack of experience. Anyway what is the largest prop that I could use on the .25 that would not harm it. I can fly the plane with the 11x7 prop but not the 9x5. I just wanted to know because I can train with 11x7 if I can use it.

Thanks
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Old 12-30-2002, 12:50 AM
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big max 1935
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walkingtall: I would try a 10"/4 pitch & take some of the travel out of controls, move push-rods to outer hole on surface & inner hole on servo if still too much control. If you can get them a white Grish prop,sure they flop around allot but for a beginner you may not break one every flight. Good Luck, big max 1935
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Old 12-30-2002, 01:01 AM
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Thanks Big Max, I don't guess a break away prop like ones used on dliders would work would they?
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Old 12-30-2002, 01:32 AM
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big max 1935
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Nope!!Max
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Old 12-30-2002, 05:53 PM
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Thanks for the replies.Max what do you mean by lower DB'S.
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Old 12-30-2002, 07:33 PM
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lot of sound comes off high speed prop tips,slowing the rotating tips rpm makes less sound.db=sound loudness,one club I fly at the db at 10' max 95,above that,no flying.
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Old 12-30-2002, 08:54 PM
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big max 1935
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YOU ;Said it for me JOHN ,good show! MAX , HAPPY NEW YEAR!!
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Old 12-30-2002, 11:15 PM
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Try a thin blade 14x6 propeller.
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Old 12-30-2002, 11:41 PM
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on my OS 91 FS I'm running a 14X6 wide prop,getting less slippage,very good thrust for vertical
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