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    mvvs 1.60 gasser - 8/23/2003 12:42:53 AM   
    Patriot



    Posts: 687
    Joined: 8/1/2003
    From: Port Orchard, WA, USA
    Status: offline     		I heard the MVVS 1.60 gasser swings a 18x8 prop quite happily when broken in. My problem is that the plane I am building has only enough clearance for about a 16" prop.

    I was thinking of using a 3-blade 16x8 by zinger.

    Any comments on how the engine may perform with a 3-blader?

    Patriot

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    A man who learns from his own mistakes is very smart, but a man who learns from the mistakes of others, is truly wise. Adm.
           Post #: 1

    mvvs 1.60 gasser - 8/23/2003 1:53:19 AM   
    GeraldRosebery


     

    Posts: 562
    Joined: 12/20/2001
    From: Niagara-on-the-Lake , ON, CANADA
    Status: offline     		My advice is don't do it. These engines seem to prefer a two bladed prop. Try a 16 x 10 or 16 x 12


    _____________________________

    Gerry Rosebery
    Niagara-on-the-Lake, Ontario

    (in reply to Patriot)
           Post #: 2

    3-blade - 8/23/2003 2:36:51 AM   
    Patriot



    Posts: 687
    Joined: 8/1/2003
    From: Port Orchard, WA, USA
    Status: offline     		I just hope that a 2 blade prop with the 10 or 12 pitch will work well enough give me the rpm/thrust I am looking for.

    If multi-blade props are such a problem, as I have heard, then why are so many of them made, and when "can" they be used with real effectiveness?

    Patriot

    _____________________________

    A man who learns from his own mistakes is very smart, but a man who learns from the mistakes of others, is truly wise. Adm.

    (in reply to Patriot)
           Post #: 3

    3 blade props - 8/23/2003 2:45:48 AM   
    Daryl Martel



    Posts: 595
    Joined: 2/10/2002
    From: WinnipegManitoba, CANADA
    Status: offline     		Graupner makes a very nice 3 blade nylon 15 X 8. It's the biggest 3 blade they make. I have 2 of them. Should work OK on that size engine. Lots of places carry Graupner but Hobby Lobby for sure...

    _____________________________

    Spending my daughters inheritance one plane at a time...

    (in reply to Patriot)
           Post #: 4

    mvvs 1.60 gasser - 8/23/2003 2:47:32 AM   
    Ed Cregger



    Posts: 7484
    Joined: 1/31/2002
    From: Ringgold, GA, USA
    Status: offline     		We can talk for hours about why model three blade props do not work as well as model two blade props, but experience is the best teacher. Buy one and try it. You may even decide that it serves your purpose well. Me, I don't use'em. BTDT

    (in reply to Patriot)
           Post #: 5

    mvvs 1.60 gasser - 8/23/2003 6:46:22 AM   
    GeraldO


     

    Posts: 200
    Joined: 11/16/2002
    From: Raleigh, NC,
    Status: offline     		I tried a 16x8 Graupner "Super Nylon" three blader prop on mine. http://www.hobby-lobby.com/grprop.htm
    I'm using the tuned MVVS exhaust. The Graupner prop flew the plane OK but it was slightly too much prop to let the engine get to full power "on the pipe". I could only get about 7600 RPM with it. It may not be the best three blade prop design out there though.

    With a two blade APC 17x8 I got 8900-9000 RPM readings.

    I haven't tach'ed it yet but so far I like the 17x10 APC the best with this engine/exhaust setup but I still plan to try others.

    Which prop is best will depend some on your exhaust and which vintage your 160 is. Mine is the model that was out just before the current "Red Head".

    (in reply to Patriot)
           Post #: 6

    mvvs 1.60 gasser - 8/26/2003 6:35:27 PM   
    Scoubidou



    Posts: 1518
    Joined: 7/7/2003
    From: Boisbriand, QC, CANADA
    Status: offline     		Hello Gerald,


    With a two blade APC 17x8 I got 8900-9000 RPM readings.
    1)Did you tach a 18x8 APC or 18x7 prop 2 blades?

    2)Which tune pipe model did you use and what is your airplane model and weight please? I plan to use it on 24% CA Extra but that long tune pipe can bring dead weight!
    Scoubidou

    (in reply to Patriot)
           Post #: 7

    Re: mvvs 1.60 gasser - 8/27/2003 3:16:01 AM   
    BigBird1



    Posts: 752
    Joined: 2/26/2002
    From: Knoxville, TN, USA
    Status: offline     		[QUOTE]Originally posted by Patriot1970
    I heard the MVVS 1.60 gasser swings a 18x8 prop quite happily when broken in. My problem is that the plane I am building has only enough clearance for about a 16" prop.


    Bigger wheels!!! Happens to me all the time...

    _____________________________

    I never met a Chaos I didn't like

    (in reply to Patriot)
           Post #: 8

    BIGGER WHEELS??? - 8/27/2003 4:27:29 AM   
    Patriot



    Posts: 687
    Joined: 8/1/2003
    From: Port Orchard, WA, USA
    Status: offline     		Sure, I could just use a couple giant Balloon Tires off my Neighbors' Quad ATV. Of course that might be a little too heavy then. Guess I'll need an even bigger Engine. LOL

    No seriously, I haven't got the engine yet, but I think that is the one I will want to use, since I have heard good things about it. I think a 17x10 might work (maybe). I here the 17x10 works very well with this engine. I am almost sure an 18" might be a little too big. I could almost mow the grass with it.
    Hey, I might be on to something.

    Patriot

    _____________________________

    A man who learns from his own mistakes is very smart, but a man who learns from the mistakes of others, is truly wise. Adm.

    (in reply to Patriot)
           Post #: 9

    mvvs 1.60 gasser - 8/27/2003 4:59:17 AM   
    BigBird1



    Posts: 752
    Joined: 2/26/2002
    From: Knoxville, TN, USA
    Status: offline     		Oh I know...everyone is juicing up the front of their planes (me included) something has got to give...longer landing gears, blocking up the gear, bigger wheels...

    I have two planes with big motors, one I had to block up the landing gear 2" and use 6" wheels to clear a 22" prop. The other one I just had to use 6" wheels...

    The Sullivan Sky-Lite wheels do not weigh a lot..nore does the foam ones...

    Kit manufactures are forgetting that when people put the max size engines, something is a lil' short...

    BB1

    _____________________________

    I never met a Chaos I didn't like

    (in reply to Patriot)
           Post #: 10

    mvvs 1.60 gasser - 8/27/2003 8:16:34 AM   
    GeraldO


     

    Posts: 200
    Joined: 11/16/2002
    From: Raleigh, NC,
    Status: offline     		[QUOTE]Originally posted by Scoubidou
    Hello Gerald,


    With a two blade APC 17x8 I got 8900-9000 RPM readings.
    1)Did you tach a 18x8 APC or 18x7 prop 2 blades?

    2)Which tune pipe model did you use and what is your airplane model and weight please? I plan to use it on 24% CA Extra but that long tune pipe can bring dead weight!
    Scoubidou     [/QUOTE]
    I used the MVVS tuned exhaust designed for this engine. Morris Hobbies has it. It doesn't add "dead" weight, it adds a major power increase. The bigger problem is where do you hide that great long thing? On the Four-star it runs down the outside of the fuselage. I just tried the plane with a K&S "can" type smoke muffler last weekend. Still runs good but the power loss is quite noticable. It's in a Sig Four Star 120 which weighs in at about 13.5lb. Went from unlimited vertical with the tuned muffler, down to unable to hold a hover for more than a few seconds with the K&S. It does run a little smoother through the midrange though with the K&S.

    I havn't measured the RPM or even ran it yet with an 18x8 APC but I have one and intend to try it soon. I bent the aluminum landing gear down farther on the Four Star to make it sit taller for the big props.

    (in reply to Patriot)
           Post #: 11

    mvvs 1.60 gasser - 8/28/2003 2:00:53 AM   
    Scoubidou



    Posts: 1518
    Joined: 7/7/2003
    From: Boisbriand, QC, CANADA
    Status: offline     		Well, if it's so powerful, I w'ill try it.

    We can hide the pipe under fuse by building a small cabane of balsa and monokote.
    Did you weight your pipe? PLease let me know if you have the weight and dimensions.
    Scou.

    (in reply to Patriot)
           Post #: 12

    mvvs 1.60 gasser - 8/28/2003 7:09:23 PM   
    pe reivers



    Posts: 2513
    Joined: 1/23/2002
    From: Arcen, , NETHERLANDS
    Status: offline     		[QUOTE]Originally posted by GeraldO
    I used the MVVS tuned exhaust designed for this engine. Morris Hobbies has it. It doesn't add "dead" weight, it adds a major power increase. The bigger problem is where do you hide that great long thing? On the Four-star it runs down the outside of the fuselage. I just tried the plane with a K&S "can" type smoke muffler last weekend. Still runs good but the power loss is quite noticable. It's in a Sig Four Star 120 which weighs in at about 13.5lb. Went from unlimited vertical with the tuned muffler, down to unable to hold a hover for more than a few seconds with the K&S. It does run a little smoother through the midrange though with the K&S.

    I havn't measured the RPM or even ran it yet with an 18x8 APC but I have one and intend to try it soon. I bent the aluminum landing gear down farther on the Four Star to make it sit taller for the big props.     [/QUOTE]

    The MVVS tuned pipe is in resonance between 7000 and 9000 rpm.
    Below 7000 the pipe falls off the edge slowly

    _____________________________

    Pe, Dealer for MVVS, MTW and Mejzlik; www.mvvs.nl
    There is sanctuary in analisys.

    (in reply to Patriot)
           Post #: 13

    mvvs 1.60 gasser - 8/30/2003 4:12:13 PM   
    PlaneKrazee



    Posts: 3515
    Joined: 5/15/2002
    From: Westerly, RI, USA
    Status: offline     		How does the MVVS engine perform with a conventional muffler on a APC prop?

    Will it put out more power than a Saito 150 or Enya 155 with an in cowl muffler?

    The Enya is a good, very fuel effecient engine that will run on 5-10% nitro and spin a APC 18X6W at about 8200 rich.

    I wanted to go gas but the engines are taking a long time to come out and I don't think there will be any weight savings fuel/battery/ignition//batterymuffler vs. engine/fuel/onboard glow.

    No room in my plane for a tuned pipe.

    _____________________________

    KB1DTB
    AMA11123

    (in reply to Patriot)
           Post #: 14

    mvvs 1.60 gasser - 8/30/2003 4:39:13 PM   
    Scoubidou



    Posts: 1518
    Joined: 7/7/2003
    From: Boisbriand, QC, CANADA
    Status: offline     		I would not say the MVVS is better than Saito 150 glow. With the Bisson Pitt, we can get 500RPM more than supplied muffler.
    Here are a few tach reading I have found on internet with a bisson pitt muffler:
    APC RPM
    16x10 8500
    16x8 8200
    17x8 7900
    17x8 7960
    17x8 8210
    18x10 8050
    17x8 8500
    MVVS1.6
    Engine 932.7g 32.9oz
    Ignition 107.73g 3.8oz
    Bisson pitt muffler 153.08g 5.4oz
    motor mount needed ? 7-10 oz

    A glow engine has better weight/thrust or H.P ratio than gas under 40CC. If you want to fly 3D, go with the Saito (lighter). If you want to fly a lot, at low co