Extreme Speed Prop Planes Discuss the need for speed with fast prop planes (Screamin Demon, Diamond Dust, Shrikes or any REAL sound breakin'''' plane)

H9 Aresti question

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Old 12-29-2011, 03:13 PM
  #1
Jim Oliver
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Default 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?

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Jim
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Old 12-29-2011, 05:28 PM
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Flyboy Dave
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Default RE: H9 Aresti question

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

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Old 12-29-2011, 05:39 PM
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Jim Oliver
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Default 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!

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Jim
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Old 12-29-2011, 05:57 PM
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Flyboy Dave
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Default 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.

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Old 12-29-2011, 05:59 PM
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Jim Oliver
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Default RE: H9 Aresti question

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

Jim
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Old 12-29-2011, 06:05 PM
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Flyboy Dave
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Default 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.
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Old 12-30-2011, 08:42 AM
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Default 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.
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Old 12-30-2011, 11:42 AM
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Flyboy Dave
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Default 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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Old 12-30-2011, 12:29 PM
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Default 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
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Old 12-30-2011, 06:53 PM
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Jim Oliver
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Default 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?

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Jim
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Old 12-31-2011, 09:15 AM
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Flyboy Dave
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Default 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. [:@]
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Old 12-31-2011, 10:31 AM
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Jim Oliver
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Default 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
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