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  1. #1876

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    RE: *** Ultra Sport Brotherhood ***

    Do you by chance know what the useful prop range might be for the OS160fx? Trying to determine if there might also be a problem with the ultrasport installation especially with retracts. Thanks, Rich.

  2. #1877

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    RE: *** Ultra Sport Brotherhood ***

    Sorry I meant to say prop ground problem.

  3. #1878
    KaP2011's Avatar
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    RE: *** Ultra Sport Brotherhood ***

    Aerobatic: 15x12-14, 16x10-14, 16.5x10-13
    Sport: 17x10-13, 18x10-12
    Straight from the OS web page.
    KaP2011
    AMA #408493
    SPA #521
    Ultra Sport Brotherhood #110
    Spitfire Brotherhood # 193

  4. #1879
    72's Avatar
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    RE: *** Ultra Sport Brotherhood ***

    APC 18-6w or 16-8 3 blade.
    Club Saito #614/Ultimate Brotherhood #57
    Ultra Sport Brotherhood #34

  5. #1880

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    RE: *** Ultra Sport Brotherhood ***

    With the 17 or 18" props on the os160fx, in your opinions do you think I will have adequate ground clearance for the prop? Or will I need to use taller main retract struts?

  6. #1881
    72's Avatar
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    RE: *** Ultra Sport Brotherhood ***

    I'd say you need about 1" of ground clearance when the airplane is sitting on its wheels and the tail is up and level- takeoff attitude.
    Club Saito #614/Ultimate Brotherhood #57
    Ultra Sport Brotherhood #34

  7. #1882

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    RE: *** Ultra Sport Brotherhood ***

    OK, it might be tricky, but I'll check the plans and see if I can obtain an estimated ground clearance measuring 9" from the center engine shaft (for an 18" prop) to see how far above ground the prop tip would be using the stock mains and 3" wheels that might be built with the kit. Thanks for you help.

  8. #1883
    72's Avatar
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    RE: *** Ultra Sport Brotherhood ***

    I just measured a set of plans I have and when the wing centerline is parallel to the ground - 0 incidence -  there is 9 1/2 inches to the prop hub. A 16 inch prop would give you 1 1/2 inches clearance.
    Club Saito #614/Ultimate Brotherhood #57
    Ultra Sport Brotherhood #34

  9. #1884

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    RE: *** Ultra Sport Brotherhood ***

    How bout that; we're spot on! I measured also using the same technique and got about the same. The plans said to use 2 3/4" inch wheels for retracts. So when I measured from the engine centerline to the line for ground on the bottom of the wheel, I got about 9 1/2" too. So a 18" prop wouldn't give enough clearance, but the 16" give about 1 1/2". So then I checked the APC web site and they offer 16" props starting at 3" pitch all the way up to 16" pitch. Then I downloaded the manual for the engine from the tower site and it calls for several 16" props and one 16.5" prop for aerobatic use. It also lists a couple of 17" and one 18" prop for sportsman use. So now I am happy and excited, because I think I can get the 160 installed OK. This engine didn't exist back in the 90's, weighs less than the ST2500, and is about the samesize as the os108 and puts out 3.7HP! Also took measurements from the motor mount and engine from the tower site and measured the plans, and it will fit nicely. So my winter project is laid out.

    But gotta also figure out the retract install.

    BTW, I'm planning to use an os engine mount, but it doesn't have any vibration isolators. I saw Jtec's snuff vibe kit, but wasn't impressed because you have to drill out you new motor mount to use it. Do you know of any other vibration mounts that are popular? Thanks, Rich

  10. #1885
    72's Avatar
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    RE: *** Ultra Sport Brotherhood ***

    If your prop is balanced and the firewall is solid, you won't have any problems. I am using the OS aluminium predrilled mount for mine. I have found the Xoar props are almost always balanced or require very little to get them that way. My favorite props lately are the Falcon props. I use these on everything up to a DLE111 and I have only had maybe one out of around 15 that needed any balancing.
    Club Saito #614/Ultimate Brotherhood #57
    Ultra Sport Brotherhood #34

  11. #1886

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    RE: *** Ultra Sport Brotherhood ***

    Thanks for the info. Am not familiar with Falcon and Xoar,but will check them out.

  12. #1887
    72's Avatar
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    RE: *** Ultra Sport Brotherhood ***

    Here are the Falcons. He also has the Xoar's. I like the Falcons myself but have both.

    http://www.thunderboltrc.com/index.p...2s1bgjli1kipf3
    Club Saito #614/Ultimate Brotherhood #57
    Ultra Sport Brotherhood #34

  13. #1888

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    RE: *** Ultra Sport Brotherhood ***

    Wow! This is fascinating stuff. Thanks for letting me know what's available. Seems I will need to know how to determine the correct pitch prop for my 160 engine. Other that trial and error, is there a process to determine your engine requirements for a new engine? Have you started building your 1000 yet? Also, do you want me to address you by your first name our just #72? Jus thought I'd ask. Rich

  14. #1889

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    RE: *** Ultra Sport Brotherhood ***

    Richwill:

    The best way to get the right prop to start with is to find out what other people are using. Do NOT go by the OS prop recommendations. They are intentionally oversized to keep the rpm, and therefore the noise, down for their European and Japanese markets. You will get much better performance and a lot lower operating temps by using the 18 x 6W or 16 x 8 three blade mentioned above.

    Jim (My OS 160 fx has outlasted three airframes.)


  15. #1890

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    RE: *** Ultra Sport Brotherhood ***

    Thanks, Jim!

  16. #1891

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    RE: *** Ultra Sport Brotherhood ***

    Jim, who makes the 16/8 3 blade?

  17. #1892
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    RE: *** Ultra Sport Brotherhood ***

    Rich, Mezjlik andZoar are 2 companies that make 3 bladed props. They are not cheap!!
    I haven't started mine yet and won't until my house renos are done. Probably around Christmas. I have had 2 Ultrasport 60's which were each over 20 years old before they finally met their end.    Lash

    Club Saito #614/Ultimate Brotherhood #57
    Ultra Sport Brotherhood #34

  18. #1893
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    RE: *** Ultra Sport Brotherhood ***

    Graupner, Master Airscrew are a couple others on the 3 blade props.
    ULTRA SPORT BROTHERHOOD #120
    GOLDBERG TIGER CLUB #10
    CLUB SAITO #590

  19. #1894

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    RE: *** Ultra Sport Brotherhood ***

    Master Airscrew makes a 16 x 8 and a 16 x 10 three blade. They are not the most efficient props in the world, but the 160 in a US 1000 does not need to struggle to get the last few %.

    Graupner makes 16 x 8 three blade that is more efficient, but expensive. (Google "graupner prop")

    Jim

  20. #1895

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    RE: *** Ultra Sport Brotherhood ***

    Thanks for the other prop sources, guys. Lash, I won't be starting mine til around the same time or after the first of the year. I mainly want to do the research to make sure that the upgraded components that I want to use will work, and I've found that they are. Can someone comment on what prower range digital servos that I should consider. I'm thinking of Futaba or Hitec brands. Rich

  21. #1896

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    RE: *** Ultra Sport Brotherhood ***

    Read this before you get digital servos
    http://www.rcgroups.com/forums/showthread.php?t=801545
    Ken
    Wherever conversion engines are outlawed, only outlaws will have conversion engines.

    ULTA SPORT BROTHERHOOD #8

  22. #1897

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    RE: *** Ultra Sport Brotherhood ***

    Thanks!

  23. #1898
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    RE: *** Ultra Sport Brotherhood ***

    hi rcken
    got a question for you.
    on the list I an listed as #97 but on some of the replies, etc
    I am listed as #98.
    so which one is correct? I assume that since I am #97 on list
    that it is the correct one.

    thanks
    pt19 flyer
    BROTHERHOODS
    ULTIMATE #91
    USPORT#97
    CUB #133
    cub brotherhood 170

  24. #1899
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    RE: *** Ultra Sport Brotherhood ***

    Saw a US 1000 up for bid on ebay.

    http://www.ebay.com/itm/Great-Planes...item1c2c9ed3bb

  25. #1900

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    RE: *** Ultra Sport Brotherhood ***

    Hello Rich,

    I recently had an Ultrasport 1000 with an OS 160 FX. If you decide to go the analog route with your servo's, I used a Futaba 9202 on each elevator half, a 9202 on each aileron and a 9402 on the rudder. If you want to go the digital route, I suggest something in the same torque range. Personally, I wouldn't use a Hitec servo for a paper weight, but of course the choice is yours.

    Good luck with your kit construction.

    David

    Oh BTW, I just remembered that Futaba doesn't make the 9202 anymore. So if you don't already have any, you will need to find an equivalent servo.
    Fly Safe and Have Fun ! ! !
    Ultra Sport Brotherhood #22


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