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    prop size - 8/29/2012 6:24 PM   
    m-mtoys


     

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    From: Detroit, MI, USA
    Status: offline     		I am putting a 55 AX engine on this plane,but not sure what prop to use in a 3 blade or 4 blade.

    The engine calls for a 12/7 or 8 13/6or 7 Not space for a two blade prop. Carey

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    RE: prop size - 8/29/2012 11:26 PM   
    JimCasey



    Posts: 1930
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    From: Lutz, FL, USA
    Status: offline     		Use the same pitch for a 3-blade and drop the diameter by 10%


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    RE: prop size - 8/30/2012 12:27 AM   
    Lamoilleriver


     

    Posts: 195
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    From: northern, VT, USA
    Status: offline     		Had no idea they are making 4 bladed props.

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    RE: prop size - 8/30/2012 10:58 AM   
    Laird SS


     

    Posts: 601
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    Last Login: 5/19/2013
    From: Peoria, AZ, USA
    Status: offline     		Biela makes 2, 3, and 4 blade props in many different size/pitch combinations. They also have some pusher props. The material is carbon fiber with a wood hub. All the props are balanced individually just before they are put out for sale.

    In the interests of full disclosure: I do not work for Biela, nor do I receive anything from them for any sales that they may get from my comments.

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    RE: prop size - 9/12/2012 8:30 PM   
    jaka


     

    Posts: 7183
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    From: Upplands Vasby, SWEDEN
    Status: offline     		Hi!
    What kind of strange animal is it that cannot take a two blade prop??

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    RE: prop size - 9/13/2012 1:39 PM   
    ronwc



    Posts: 393
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    From: LARGO, FL, USA
    Status: offline     		11 x 7 three blade


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    RE: prop size - 9/13/2012 10:31 PM   
    m-mtoys


     

    Posts: 8
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    From: Detroit, MI, USA
    Status: offline     		It is a Balsa USA Laker plane

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    RE: prop size - 9/14/2012 12:41 AM   
    Mustang Fever



    Posts: 3101
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    From: Cadillac, MI, USA
    Status: offline     		What's the biggest prop you have room for?

    I have a pair of 55AXs on a B-25. I finally settled on 12x6 MAS 3 blade props. These let the engines turn about 10,500 rpm on 15% Cool Power, good for around 60 mph and gobs of thrust. They never liked any of the various two blade props I tried, including the ones recommended by OS.


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    RE: prop size - 9/14/2012 12:17 PM   
    jaka


     

    Posts: 7183
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    From: Upplands Vasby, SWEDEN
    Status: offline     		Hi!
    I'm certain that if you tried some Graupner Sonic or RAM...or even APC props in the range of 12x6,13x4, 13x5 you would see better performance than those 12x6 3-blade MA props.

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    RE: prop size - 9/14/2012 3:54 PM   
    Mustang Fever



    Posts: 3101
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    From: Cadillac, MI, USA
    Status: offline     		It's hard to find a lot of info on the Laker, it's an old Laddie Mikulasko design from RCM Magazine. The listing on RCM plans calls for a 40-46, and I'd bet that Laddie put that engine pod down low so that an 11" prop is probably as big as you can go.

    You might want to think about a 46AX, or even electric power. I used a Turnigy G46-670 turning an MAS 11x7 3 blade on five cells in a Mikulasko "Arrow" flying boat, and it wails. The nice thing about electrics in "pod engine" flying boats is that the battery pack makes it a lot easier to balance the dang things. They really want to come out tail heavy.


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    RE: prop size - 9/14/2012 4:12 PM   
    LADISLAV


     

    Posts: 184
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    From: Dundas, ON, CANADA
    Status: offline
    quote:

    ORIGINAL: m-mtoys

    I am putting a 55 AX engine on this plane,but not sure what prop to use in a 3 blade or 4 blade.

    The engine calls for a 12/7 or 8 13/6or 7 Not space for a two blade prop. Carey


    If there was no modification done to the kit, then 12” prop will fit nicely. The model does not need any larger props.
    Laddie.


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    RE: prop size - 9/14/2012 6:22 PM   
    Mustang Fever



    Posts: 3101
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    From: Cadillac, MI, USA
    Status: offline     		Nice to hear from the source!!


    I'd go with the 12x6 MAS 3 blade, then. I find that the 55s in my bomber run a very long time on 11 oz of fuel with that prop.


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