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  1. #1

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    H9 Aresti question

    Do any of you guys remember details about the flutter problems that the H9 Aresti had? Which surface(s) were the worst offenders and what was the best fix?

    Thanks,
    Jim
    Jim Oliver
    Revver Brother No. 51

  2. #2
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    RE: H9 Aresti question

    Hold on, Jim....lemme look at my archives, I went all through that with mine.

    Flyboy Dave.
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    An engineer says.... "That will not work".
    A mechanic says..."Oh yeah, watch this".
    Old age and treachery will overcome youth and skill.
    Revver Bro #4.

  3. #3

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    RE: H9 Aresti question

    When I first began flying mine, several years ago, I used larger dia., low pitch props on my Rossi .53. After not flying it for a long time, I have tried shorter props with more pitch (APC 10x8, peaks at 14,400-launch at 13,600 or so) and have found "the Wall".

    No apparent damage, but I'm not sure which surface fluttered. I had connected the elev. halfs with a large hardwood dowel in an efort to prevent the two separate pieces from fluttering; don't know if that really helped or not???

    Don't know how fast this thing really is, but it gets small in hurry!

    Thanks,
    Jim
    Jim Oliver
    Revver Brother No. 51

  4. #4
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    RE: H9 Aresti question

    ....yep. I gotta fire up my old computer and see if I can find the details.
    I believe it was the horizontal stab....the reason is because the elevator
    surfaces are way too big, causing the flutter. If I can't find the info. I'll
    do a search on...."Flyboy Dave Arresti problems".

    I still have the plane....Ill get more info tomorrow.

    An engineer says.... "That will not work".
    A mechanic says..."Oh yeah, watch this".
    Old age and treachery will overcome youth and skill.
    Revver Bro #4.

  5. #5

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    RE: H9 Aresti question

    Great! Trimming the elev. would be very easy, even I could do it!

    Jim
    Jim Oliver
    Revver Brother No. 51

  6. #6
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    RE: H9 Aresti question

    ....here's some reading for ya'.....gotta love the search function.

    http://www.rcuniverse.com/forum/m_76...tm.htm#1199370

    FBD.
    An engineer says.... "That will not work".
    A mechanic says..."Oh yeah, watch this".
    Old age and treachery will overcome youth and skill.
    Revver Bro #4.

  7. #7

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    RE: H9 Aresti question

    Plane looks good for high speed to me, but not for extreme speed. I would bet it would be perfect for "ballistic pattern" type of flying.

  8. #8
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    RE: H9 Aresti question

    ....I employed a double elevator rod system to keep both
    sides of the elevator under control. The tail brace shored
    everything up as well. Mine went about 125 tops, so extreme
    speed....no, but it hauled butt for a sport plane.

    FBD.
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    An engineer says.... "That will not work".
    A mechanic says..."Oh yeah, watch this".
    Old age and treachery will overcome youth and skill.
    Revver Bro #4.

  9. #9

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    RE: H9 Aresti question

    FBD,
    Thanks for the link.

    I think I can find a more deserving airframe for the Rossi .53; I'm thinking Direct Connection F20.

    Jim
    Jim Oliver
    Revver Brother No. 51

  10. #10

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    RE: H9 Aresti question

    Did it seem that the flutter began with the horizontal stab or the elevator? Was there any damage to elevator hinges or hinge attach points?

    Thanks,
    Jim
    Jim Oliver
    Revver Brother No. 51

  11. #11
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    RE: H9 Aresti question

    ....as I recall, the elevator caused the horiz. stab to break where
    it attached to the fuse. You can see in the picture I posted that
    I cut the covering back and glued the stab back solidly to the fuse.
    The covering I had on hand didn't match the original color perfectly
    but at that point I was happy to still have the airplane in one piece
    after the audible flutter.

    The hinges held up fine, I believe, and the vertical stab and rudder
    were not effected.

    That plane is a "snapper".....that is to say, if you pull back too
    much elevator you will be rewarded with a near perfect unexpected
    snap roll. [:@]
    An engineer says.... "That will not work".
    A mechanic says..."Oh yeah, watch this".
    Old age and treachery will overcome youth and skill.
    Revver Bro #4.

  12. #12

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    RE: H9 Aresti question

    Dave,
    Thanks for your time to help with this "project". I plan to reduce the elevator size per your example, maybe 20-25% to start, and since I want to use the 53 on another model, I think I will put one of my Rossi 45s in it's place.

    My buddy and I were impressed with the speed (un-documented) of the Aresti when the 53 was really singing, but it's never gonna be really fast, anyway. We'll see what the F20 does with the 53 up front. It may be too quick for my old eyes and fingers!

    Cheers,
    Jim
    Jim Oliver
    Revver Brother No. 51


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