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3 blade propelor for my engine

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3 blade propelor for my engine

Old 01-05-2007, 02:58 PM
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gun man
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Default 3 blade propelor for my engine

I have a Magnum 120 FS and i need to use a 3 blade prop on my plane what size do i use????
Old 01-05-2007, 03:09 PM
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Default RE: 3 blade propelor for my engine

Hi!
15x6 APC!...But why use a 3-blade?? When a 2-blade is always better?
Old 01-05-2007, 03:18 PM
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carrellh
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Default RE: 3 blade propelor for my engine

Most likely you'll have to settle for a 14x7 or 13x8. Three blade selection is pretty limited so you usually have to compromise
Old 01-07-2007, 01:37 AM
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Default RE: 3 blade propelor for my engine

I use 3 blade Master Airscrew props on my Warbirds all the time with no problems.
Old 01-07-2007, 10:48 AM
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Default RE: 3 blade propelor for my engine

Graupner 14x8 3 blade,there is none better. Looks good and pulls like a clydesdale. I have a Saito 120, I had a 15x7 APC on it and it was to much power for the plane it was in.I decided to switch to a 3 blade prop because all the know it alls said a 3 blade prop is less efficient. I picked the Graupner because it looks close to scale. The know it alls were wrong the Graupner 3 blade pulled just as much and because I went to a higher pitch the plane was even faster. I left the prop on though because it looks so good.
Old 01-13-2007, 08:58 PM
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wylieruneyjr
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Default RE: 3 blade propelor for my engine

14x7 14x7 14x7 Should put you in around 9000 RPM 14x7 14x7 14x7
Old 01-14-2007, 08:52 AM
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Default RE: 3 blade propelor for my engine

2 blade props = speed through rpm's. More lots of air through hi speed rotation

3 blade prope = torgue. move lots of air through low speed rpm's.

Bill
Old 05-19-2007, 01:40 PM
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Default RE: 3 blade propelor for my engine

I have an .82 Saito and was wondering what is best. I ordered a MAS 12x6x3. My other choice is a 12x8x3. I have a 2 bladed 13x7 on it now while breaking in the engine and it spins that around 9000 rpm without being properly tuned yet. What prop should I put on it? It is going on a CMP P40.
Old 05-19-2007, 02:31 PM
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Default RE: 3 blade propelor for my engine

Hi!
As I said earlier ...there is no substitute for a 2-blade prop.
You may find a 3-blade that works Ok but there will always be a 2-blade prop that is better if you look for it.
APC is a good prop. Ma is not!

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