Register

If this is your first visit, please click the Sign Up now button to begin the process of creating your account so you can begin posting on our forums! The Sign Up process will only take up about a minute of two of your time.

Page 1 of 2 12 LastLast
Results 1 to 25 of 36

  1. #1

    Join Date
    Nov 2009
    Location
    Vestby, NORWAY
    Posts
    50
    Gallery
    My Gallery
    Models
    My Models
    Ratings
    My Feedback

    Ultra Flash ground handling

    Hello
    Had maiden flight on my UF today, and it flew awesome. But ground handling was terrible...I run stock gear with Intarico wheels, and I really had a hard time keeping the plane in a straight line during take-off and landing. Several times I had to abort due to the fact that the plane was skidding all over the place - it really had some spectacular drifts...
    It got better with some, more, Toe-in - but what is the fix here? I fly mainly from asphalt.
    Thanks, Helihover.

  2. #2

    Join Date
    Apr 2011
    Location
    Melbourne, AUSTRALIA
    Posts
    665
    Gallery
    My Gallery
    Models
    My Models
    Ratings
    My Feedback

    RE: Ultra Flash ground handling

    What I do with my jets is set very little movement on my steering during take off. I also set 35% expo to all my flight controls.
    I usually have 3 sets rates on one switch so it does not complicate things.
    Just make sure thatwhat ever rates you set up, your plane must still be able to Fly, and land with elevator authority On all set rates.
    What I mean by this is, if you set little movement say 20-25% for steering and rudder, it does not mean that you set that rate for all other control surfaces, as the plane mite not flywell with only 20-25% elevator.
    I know this sounds obvious but I have seen it done resulting in a plain nearly goingin.
    Good luck
    If you have to borrow, you cant afford it

  3. #3
    AFTERBURNER1's Avatar
    Join Date
    Jun 2003
    Location
    Anaheim Hills, CA
    Posts
    4,354
    Gallery
    My Gallery
    Models
    My Models
    Ratings
    My Feedback

    RE: Ultra Flash ground handling

    Dump the stock composite arf nose wheel. Replace it with a hard rubber nose wheel of the same or a bit smaller size. BVM, interico will suffice. Get an 6mm drill bit, drill out the hub of the new wheel and use the stock wheel guts.. ALL OF YOUR PROBLEMS WILL GO AWAY!!

    No need to mess around with rates, expo etc etc...
    JETCAT USA

  4. #4
    quist's Avatar
    Join Date
    Jan 2002
    Location
    Glendale, AZ
    Posts
    3,024
    Gallery
    My Gallery
    Models
    My Models
    Ratings
    My Feedback

    RE: Ultra Flash ground handling

    8MM??? I dont think so.

    I have used both the bvm and intairco, problems went away.

  5. #5
    AFTERBURNER1's Avatar
    Join Date
    Jun 2003
    Location
    Anaheim Hills, CA
    Posts
    4,354
    Gallery
    My Gallery
    Models
    My Models
    Ratings
    My Feedback

    RE: Ultra Flash ground handling


    ORIGINAL: quist

    8MM??? I dont think so.

    I have used both the bvm and intairco, problems went away.

    I believe it is 6mm. My bad.... you drilled it.... Was 6 mm yes?
    JETCAT USA

  6. #6

    Join Date
    Dec 2001
    Location
    mia, FL
    Posts
    2,256
    Gallery
    My Gallery
    Models
    My Models
    Ratings
    My Feedback

    RE: Ultra Flash ground handling

    It's a hobby - keep it simple

    www.332ndredtail.com

  7. #7

    Join Date
    Dec 2008
    Location
    Bakersfield, CA
    Posts
    321
    Gallery
    My Gallery
    Models
    My Models
    Ratings
    My Feedback

    RE: Ultra Flash ground handling

    You might try a little up elevator during takeoff, easing some as you build up speed. But a light nose wheel will not bite so hard. A hard rubber wheel also may have less traction. But the elevator means you dont have to change anything. Just something to try while you wait for the BVM nose wheel.
    John

  8. #8
    AFTERBURNER1's Avatar
    Join Date
    Jun 2003
    Location
    Anaheim Hills, CA
    Posts
    4,354
    Gallery
    My Gallery
    Models
    My Models
    Ratings
    My Feedback

    RE: Ultra Flash ground handling

    Change the nose wheel.. That is ALL you need to do.
    JETCAT USA

  9. #9
    InboundLZ's Avatar
    Join Date
    Oct 2004
    Location
    Las Vegas, NV
    Posts
    1,938
    Gallery
    My Gallery
    Models
    My Models
    Ratings
    My Feedback

    RE: Ultra Flash ground handling


    ORIGINAL: AFTERBURNER1

    Change the nose wheel.. That is ALL you need to do.
    This is the voice of experience, a smart man would heed the advice....
    Dave Bottita
    evoJet Factory Pilot
    Smart-Fly

  10. #10
    wojtek's Avatar
    Join Date
    Dec 2001
    Location
    nj, NJ
    Posts
    4,068
    Gallery
    My Gallery
    Models
    My Models
    Ratings
    My Feedback

    RE: Ultra Flash ground handling


    ORIGINAL: AFTERBURNER1

    Change the nose wheel.. That is ALL you need to do.

    +1

    ~V~
    www.facebook.com/allscale
    http://www.all-scale.com

    - working model MFD & HUD, 3D design & printing, CNC, Laser-cutting
    - Professional-Building
    - Metal-Morph Plating
    - CARF-Models Dealer

  11. #11

    Join Date
    Aug 2010
    Location
    Nicosia, ON, CYPRUS
    Posts
    38
    Gallery
    My Gallery
    Models
    My Models
    Ratings
    My Feedback

    RE: Ultra Flash ground handling

    Had the same proplem with my F20 and some toe in and elevator up during the ground roll to keep some weight on the mains, solved the proplem
    ORIGINAL: indubitably

    You might try a little up elevator during takeoff, easing some as you build up speed. But a light nose wheel will not bite so hard. A hard rubber wheel also may have less traction. But the elevator means you dont have to change anything. Just something to try while you wait for the BVM nose wheel.
    John

  12. #12

    Join Date
    Aug 2007
    Location
    Bay Area, CA
    Posts
    3,567
    Gallery
    My Gallery
    Models
    My Models
    Ratings
    My Feedback

    RE: Ultra Flash ground handling

    ORIGINAL: Mariosff

    Had the same proplem with my F20 and some toe in and elevator up during the ground roll to keep some weight on the mains, solved the
    That's not going to fix the problem with the ultra flash.
    Team Elite Aerosport

  13. #13

    Join Date
    Jun 2002
    Location
    Watford, UNITED KINGDOM
    Posts
    7,464
    Gallery
    My Gallery
    Models
    My Models
    Ratings
    My Feedback

    RE: Ultra Flash ground handling

    Really????
    I've never seen an UF abort a take off in England or Germany on hard runways...all use stock gear and nose tyre! I know its hotter there than here (all though I'm sure someone flew in the 30 degrees we had this last weekend) I just have 35% expo on the nose steering and that is it. I with the amount of trail it has on the nose leg it runs straight all the time.

    Dw
    Motors & Rotors. JetCat, Powerbox, Intairco, Behotec, Graupner. CARF-models Rep. JR Propo for ever!, Jet 1A, MAP, Evojet, BVM

  14. #14
    Gra55h0pper's Avatar
    Join Date
    Aug 2006
    Location
    Sunnyvale, CA
    Posts
    79
    Gallery
    My Gallery
    Models
    My Models
    Ratings
    My Feedback

    RE: Ultra Flash ground handling

    I had the same problem with my regular Flash with stock Intairco wheels. Ground handling was like being on ice and expo, toe, etc. didn't help. A gyro on steering did the trick though! Never had a problem since! Highly recommend it.

  15. #15

    Join Date
    Jun 2002
    Location
    Watford, UNITED KINGDOM
    Posts
    7,464
    Gallery
    My Gallery
    Models
    My Models
    Ratings
    My Feedback

    RE: Ultra Flash ground handling

    You guys must grease your runways

    Dw
    Motors & Rotors. JetCat, Powerbox, Intairco, Behotec, Graupner. CARF-models Rep. JR Propo for ever!, Jet 1A, MAP, Evojet, BVM

  16. #16

    Join Date
    Dec 2002
    Location
    Wellingborough, UNITED KINGDOM
    Posts
    145
    Gallery
    My Gallery
    Models
    My Models
    Ratings
    My Feedback

    RE: Ultra Flash ground handling

    ORIGINAL: Dave Wilshere

    You guys must grease your runways

    Dw
    +1

    Peter

  17. #17

    Join Date
    Aug 2004
    Location
    tulsa, OK
    Posts
    770
    Gallery
    My Gallery
    Models
    My Models
    Ratings
    My Feedback

    RE: Ultra Flash ground handling

    Like some have mentioned, I had the problem on my Classic Flash. Changed to a Tam's solid nose wheel and dialed in the correct amount of toe in and that helped a lot. What finally tamed the beast for me was building a mix that lowered the steering rate when the flaps were down. On top of the mix I put about 40% expo on the dialed down steering and the problem was totally cured for me anyway.

    I have the same setup on my Ultra and it works just fine.

  18. #18
    BaldEagel's Avatar
    Join Date
    Oct 2005
    Location
    Wychling, Kent, UNITED KINGDOM
    Posts
    9,583
    Gallery
    My Gallery
    Models
    My Models
    Ratings
    My Feedback

    RE: Ultra Flash ground handling

    Is your nose wheel trailing, by that I mean is the whole leg pointing backwards not just the wheel yoke?

    Mike
    My Gast is Flabered.
    No matter what anyone say's 100% is the maximum you can get.
    If you see a deleted post, my Avatar say's it all.

  19. #19
    Ramz's Avatar
    Join Date
    Oct 2003
    Location
    Petitcodiac, NB, CANADA
    Posts
    262
    Gallery
    My Gallery
    Models
    My Models
    Ratings
    My Feedback

    RE: Ultra Flash ground handling

    Stock behotec and Intairco wheels and no issues at all on grass and asphalt. Never had an aborted takeoff. Sounds to me like some left stick practice is in order along with some proper setup.

  20. #20

    Join Date
    Jan 2002
    Location
    Kamloops, BC, CANADA
    Posts
    775
    Gallery
    My Gallery
    Models
    My Models
    Ratings
    My Feedback

    RE: Ultra Flash ground handling

    All stock set up on mine with CARF suggested gear. 5 degrees of throw on the nose with 30 % expo. Tracks fine.
    For those with bigger engines don't slam the throttle. Start the roll at 1 /4 throttle then as she begins to pick up speed, go to full power.
    Anyway....dozens of flights here and never an aborted one.

    Cheers

    Dean W.
    R/C a lifestyle for the past 39 years

  21. #21
    InboundLZ's Avatar
    Join Date
    Oct 2004
    Location
    Las Vegas, NV
    Posts
    1,938
    Gallery
    My Gallery
    Models
    My Models
    Ratings
    My Feedback

    RE: Ultra Flash ground handling

    I had nothing but issues on my Flash until I changed the nose wheel. It has nothing to do with left hand practice or anything else for that matter. You want to dick around with all the different suggestions given here, knock yourself out. Once you get that out of your system, you will finally change your nose tire and your problems will be over. With 357 flights in 14 months I am speaking from a position of experience.
    Dave Bottita
    evoJet Factory Pilot
    Smart-Fly

  22. #22

    Join Date
    Jun 2010
    Location
    HarrowMiddlesex, UNITED KINGDOM
    Posts
    204
    Gallery
    My Gallery
    Models
    My Models
    Ratings
    My Feedback

    RE: Ultra Flash ground handling

    The reason why you guys have direction problems on take off is because you have too much steering.

    There a three things you can do.

    1. Fit a harder less grippy front tyre to give you understeer.

    2. Adjust the standard set up correctly.

    3.Use a gyro on the nose leg servo.

    On the UF it is not neccesary to do either items 1 or 3.

    If you set up the nose leg correctly as follows you will have no problems.

    You will need to have your rudder/nose leg steering on seperate channels so dont use a Y-Lead.

    Use a standard mix with rudder as master and it is usefull if you can asign nose leg steering channel trim to a seperate trim lever(no problem on a Futaba 14/18MZ so you can set your nose leg tracking without effecting the rudder trim position.

    Adjust your ATV for nose leg channel so you can taxi OK and just make a nice large turn (not tight) to come on to the centre of your run way for take off.

    Use a lot of expo on nose channel.I use -60% on my 18MZ.

    The standard Carf nose leg has Caster(trail) so the nose leg will always want to caster straight any way.

    Open your throttle smoothly for take off and youshould have no problems at all with the standard gear as supplied.

    Phil.

  23. #23

    Join Date
    Nov 2009
    Location
    Vestby, NORWAY
    Posts
    50
    Gallery
    My Gallery
    Models
    My Models
    Ratings
    My Feedback

    RE: Ultra Flash ground handling

    Thank you all for suggestions - greatly apprechiated. New front wheel is ordered 
    Thanks again!
    Brgds
    Helihover

  24. #24
    AFTERBURNER1's Avatar
    Join Date
    Jun 2003
    Location
    Anaheim Hills, CA
    Posts
    4,354
    Gallery
    My Gallery
    Models
    My Models
    Ratings
    My Feedback

    RE: Ultra Flash ground handling


    ORIGINAL: Ramz

    Stock behotec and Intairco wheels and no issues at all on grass and asphalt. Never had an aborted takeoff. Sounds to me like some left stick practice is in order along with some proper setup.

    Left stick practice,,, NOT... U r funny..l

    JETCAT USA

  25. #25
    AFTERBURNER1's Avatar
    Join Date
    Jun 2003
    Location
    Anaheim Hills, CA
    Posts
    4,354
    Gallery
    My Gallery
    Models
    My Models
    Ratings
    My Feedback

    RE: Ultra Flash ground handling


    ORIGINAL: InboundLZ

    I had nothing but issues on my Flash until I changed the nose wheel. It has nothing to do with left hand practice or anything else for that matter. You want to dick around with all the different suggestions given here, knock yourself out. Once you get that out of your system, you will finally change your nose tire and your problems will be over. With 357 flights in 14 months I am speaking from a position of experience.

    Funny stuff here D!!!!! Like u or I wouldn't know.. I only have a handful of flash flights under my belt..

    Let them putz with gyros, expos, toe etc etc.

    Replace the nose wheel,,,, problem solved.
    JETCAT USA


Page 1 of 2 12 LastLast

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
All times are GMT -6. The time now is 03:50 PM.

SEO by vBSEO 3.6.1 ©2011, Crawlability, Inc.