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HomeScaleAircraftHelicopterScale Model RC Helicopters › air star sideframes on vario benzine scale body
01-15-2009 08:53 PM  9 years agoPost 1
love for scale

rrVeteran

Omaha, Nebraska U.S.A.

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anyone use the air star side frams in a benzine scale project? the ones with the servos laying horizontaly? can you give me comments, concerns, complaints? I have heard some bad things, like extreme vibration, cracking from normal flight, having to re-drill holes to attacht to woodwork ETC
would like to do a huey or a big airwolf
greg

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01-16-2009 01:26 AM  9 years agoPost 2
chprman

rrApprentice

Torrance Ca. near Los Angeles

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I have the Vario UH-1D and am using the air star frem set. Although I don't have that many hours on the bird the frames are perfect and fit as advertised.

Alan

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01-16-2009 12:24 PM  9 years agoPost 3
Jack Martin

rrApprentice

AKA HeliJack, Washougal, WA

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No problems at all with the pair I have used over the last 4 years.

Remember our Veterans.

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01-16-2009 01:07 PM  9 years agoPost 4
Airwolf crazy

rrApprentice

Lancaster, PA

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Greetings,

I had used a set of these on my Benzin when it was a P&B. They worked great. Then once I put them into my BIG Airwolf fuse they were still doing just fine when the fuse was just put together to do some flight testing. Then after I added the doors, scale details, interior, and paint I started having trouble. The fuse would just shake very badly on the ground to the point I was afraid it would flip over before it left the ground. Once in the air it still had lots of vibs. and would shake the doors open.

I removed the mech. and flew them in P&D form with no problems. But after they were back in the fuse it was still shaking the fuse bad on spool up. During a scale event the model was watched very close and it was discovered that the frames were flexing left to right above the engine (area where the servos are).

After the event I replaced the ASI frames with the Vario frames and servo tray. I spooled up Airwolf and she lifted into the sky with no effort and was ready to go on an adventure.

I have talked to a few others who have used the ASI frames. The responces have been: will never use these frames again, use two sets of frames (doubling the thickness), and some have added in extra bracing in the top section and attachment points to the fuselage.

I hope this helps.

Christopher

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01-16-2009 03:19 PM  9 years agoPost 5
Dr.Tim

rrElite Veteran

Mojave Desert

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You should ALWAYS add bracing to the TOP of the Mechanics in ANY SCALE HELICOPTER .. Without this bracing you are setting yourself up to the "VIBES"!

Dr.Tim

From Simple minds come simple ideas! Approach Engineering

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01-17-2009 12:24 AM  9 years agoPost 6
Christopher J

rrElite Veteran

Kansas City, MO Californian lost in land of Oz

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If I recall back when Christoher had this problem he mechs were properly installed with the braces at the top of the fuse as well.

Problem was the thin frames flexed to much.

Two of the Bezines I fly for an AP company had these frames and one of them experienced some problems with the frames.

Let it be known, I'm NOT bashing or criticizing an other manufacturer-just stating a problem I had on one, not both helis.

Christopher J
same as I ever was
"Still all set & Flying the original"

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01-17-2009 12:39 AM  9 years agoPost 7
love for scale

rrVeteran

Omaha, Nebraska U.S.A.

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could the flexing in Christopher's big wolf be because the carbon fiber fuse is a little more flexible than a gelcoat fuse, add that with the thin sideframes and get a lot of vibration?

I will be doing either a huey or big carbon wolf

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01-17-2009 08:36 PM  9 years agoPost 8
René N.

rrNovice

Netherlands, Europe

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About a year ago I bought the air star sideframes for my project (still unused). They are no thinner than the original vario parts though. I can imagine the holes in the upper part for the servo's don't leave enough "beef" upthere to keep it stiff enough. The main friction is between the engine (bottom-plate) and mainshaft (uppersideplates). I was planning to make a cross-section connecting them in the front and the back and bulkheads on the fuse. Have no experience with this but like to know before I do run into trouble.

Thanks,

René

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01-19-2009 05:21 PM  9 years agoPost 9
jfint

rrApprentice

Simi Valley, CA

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Maybe because they are shorter than the Vario frames they were at a resonant frequency in the particular bird? I've heard of this happening on lots of helicopters, but mostly with things like boom supports, where its easy to change the resonant frequency of the metal with a support in the middle, or even a rubber band.

I gotta say though I just don't buy the ASI frames being flexible thing, I've seen several pair come through violent crashes without damage, and I've seen several pair in scale bodies, hughes 500's airwolves, dauphins, a cobra, and a ginormous Huey, several were completely vibe free, and those with vibes needed fuse bracing or a little extra fiberglass at certain points, and in one case, just some well placed weight.

ok I can't let this go, the word "Airwolves" in this context is just funny to me ;-)

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