RE: U-Can-Do 3d 46?  
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    • All Forums >> RC Airplanes >> 3D Flying! >> RE: U-Can-Do 3d 46?
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    RE: U-Can-Do 3d 46? - 10/17/2007 1:25:49 AM   
    danny_isr


     

    Posts: 59
    Joined: 9/24/2002
    From: BOULDER, CO, USA
    Status: offline     		i'm trying to get as much throw as i can get using the Du-Bro long arms, and probably most of the time smooth but i don't want to worry about servo breaking if i will do some 3D.

    (in reply to 38)
           Post #: 6126

    RE: U-Can-Do 3d 46? - 10/23/2007 11:14:10 PM   
    danny_isr


     

    Posts: 59
    Joined: 9/24/2002
    From: BOULDER, CO, USA
    Status: offline     		which prop is recommended with OS 70 ?

    (in reply to danny_isr)
           Post #: 6127

    RE: U-Can-Do 3d 46? - 10/23/2007 11:54:52 PM   
    38


     

    Posts: 570
    Joined: 10/31/2004
    From: Pittsburgh, PA, USA
    Status: offline     		apc 14x4w

    _____________________________

    Tom Heifner
    Take-offs are optional...Landings are mandatory

    (in reply to danny_isr)
           Post #: 6128

    RE: U-Can-Do 3d 46? - 10/23/2007 11:58:15 PM   
    kbless7


     

    Posts: 20
    Joined: 7/27/2007
    From: Monument, CO, USA
    Status: offline     		In Colorado a 13X4W. A 91 at this elevation would use a 14x4w.

    (in reply to 38)
           Post #: 6129

    RE: U-Can-Do 3d 46? - 10/24/2007 2:21:09 AM   
    danny_isr


     

    Posts: 59
    Joined: 9/24/2002
    From: BOULDER, CO, USA
    Status: offline     		won't it be easier on the engine with the thiner air to swing a bigger prop ?
    i understand that the engine got less power here , but the air resistant is less as well.
    don't they cancel each other on the engine part ?

    (in reply to kbless7)
           Post #: 6130

    RE: U-Can-Do 3d 46? - 10/24/2007 3:59:45 AM   
    38


     

    Posts: 570
    Joined: 10/31/2004
    From: Pittsburgh, PA, USA
    Status: offline     		i never thought about that
    in pitt my dads ucd with a 70 had a 14x4w

    the new ucd im building right now for him has i 91 on that will swing a 15x4w poroop

    _____________________________

    Tom Heifner
    Take-offs are optional...Landings are mandatory

    (in reply to 38)
           Post #: 6131

    RE: U-Can-Do 3d 46? - 10/24/2007 4:22:54 AM   
    kbless7


     

    Posts: 20
    Joined: 7/27/2007
    From: Monument, CO, USA
    Status: offline     		There air density is extremely negligible. I'm a mechanical engineer thus I know all about fluid mechanics, thermodynamics, etc. The air density changes by a factor of less than 1%. This results in a great loss of oxygen content, and at my altitude of 7500 ft. my engines have a power loss of 25% with respect to sea level. Its absolutely disgusting, and that is why I have to really overpower planes.

    -Matt

    (in reply to 38)
           Post #: 6132

    RE: U-Can-Do 3d 46? - 10/25/2007 2:42:38 AM   
    danny_isr


     

    Posts: 59
    Joined: 9/24/2002
    From: BOULDER, CO, USA
    Status: offline     		it's almost ready to fly , probably tomorrow maiden flight.

    i got today at the hobby store 13x4W. W = 3D ? is it worth the extra (it's about $8 prop)

    (in reply to kbless7)
           Post #: 6133

    RE: U-Can-Do 3d 46? - 10/25/2007 3:26:23 AM   
    kbless7


     

    Posts: 20
    Joined: 7/27/2007
    From: Monument, CO, USA
    Status: offline     		its about half the price of the 14x4w, so its perfect

    (in reply to danny_isr)
           Post #: 6134

    RE: U-Can-Do 3d 46? - 10/26/2007 2:25:33 AM   
    danny_isr


     

    Posts: 59
    Joined: 9/24/2002
    From: BOULDER, CO, USA
    Status: offline     		Success ! went today relatively late , it was after 5pm already . so not much time was left for me to try it out.
    fueled it , checked radio . throws on low rates are as the manual , high rate are as much as i can get.
    CG a bit behind the recommended.

    at start i the engine didn't fire up (OS70). the niddle was too closed.
    opened it and the engine start right away.

    took off , had to trim the AIL only few clicks to the left and the plane tracked like pattern plane. i was surprised how slow it can fly. i did few slow rolls and landed . landing was very easy with that slow speed that this plane can go.

    i will program tonight the radio for more advance mixes . but bottom line i'm very happy with it. test flight was piece of cake .

    power wise on the OS70 with 13x4 doesn't look too promising so far. but it may be out of tune, too early to know.

    (in reply to kbless7)
           Post #: 6135

    RE: U-Can-Do 3d 46? - 10/26/2007 3:41:05 AM   
    AKFireMedic



    Posts: 806
    Joined: 2/2/2004
    From: Anchorage, AK, USA
    Status: offline     		I think you'll find that the os70 is a bit underpowered to get the full potential out of the plane. I have th Saito 82 on mine and I wouldn;t call it overpowered by any stretch. Congrats on your flight!

    _____________________________

    Da** it feels good to be a Pro Bro

    (in reply to danny_isr)
           Post #: 6136

    RE: U-Can-Do 3d 46? - 10/27/2007 2:41:00 AM   
    danny_isr


     

    Posts: 59
    Joined: 9/24/2002
    From: BOULDER, CO, USA
    Status: offline     		i'm getting about 10k RPM with the 13x4W on 5% nitro. maybe the 14x4W will work after all with 10/15% nitro ...

    (in reply to AKFireMedic)
           Post #: 6137

    RE: U-Can-Do 3d 46? - 10/27/2007 8:30:37 AM   
    AKFireMedic



    Posts: 806
    Joined: 2/2/2004
    From: Anchorage, AK, USA
    Status: offline     		Give it a shot and see how you like it. If it doesn't work out and you don't have to ream the prop too large I'll take it off your hands.

    _____________________________

    Da** it feels good to be a Pro Bro

    (in reply to danny_isr)
           Post #: 6138

    RE: U-Can-Do 3d 46? - 11/11/2007 2:38:20 AM