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-   -   High Speed Flutter -Help! (https://www.rcuniverse.com/forum/beginners-85/8553668-high-speed-flutter-help.html)

yetti831 03-07-2009 06:00 PM
High Speed Flutter -Help!
 
Hi all,


I am experiencing a lot of high speed flutter on the horizontal stab of my wild hawk. I put a piece of carbon running along the entire stab, yet it didn't help. What can I do to remedy this? Thank you in advance.

CGRetired 03-07-2009 06:14 PM
RE: High Speed Flutter -Help!
 
Well, the first thing that comes to mind is to slow it down. Perhaps that plane is not designed for fast flight. If you don't slow it down, it will fix itself.

If you built it, and hinged it, check to see if there is a gap between the surfaces. If so, close the gap using covering or tape.

yetti831 03-07-2009 06:28 PM
RE: High Speed Flutter -Help!
 
Well, one thing is for sure-the wild hawk wasn't built to go fast. My hinges are pretty tight, but I will try to seal them up. Is there anything else I can do? Thanks

j.duncker 03-07-2009 06:32 PM
RE: High Speed Flutter -Help!
 
Other than providing stiffer control linkages and tight slop free hinges there is not a lot to do BUT here is how the big boys do it [link=http://www.fly-imaa.org/imaa/hfarticles/howto/v6-1-36.html]CLICKY[/link]and some large models now incorporate mass balance weights.

yetti831 03-07-2009 06:35 PM
RE: High Speed Flutter -Help!
 
Thank you :)

MinnFlyer 03-07-2009 07:42 PM
RE: High Speed Flutter -Help!
 
1 Attachment(s)
This is your best bet

yetti831 03-07-2009 07:43 PM
RE: High Speed Flutter -Help!
 
Yes, I was going to ask if I could do that with carbon spars. Thanks!

CGRetired 03-07-2009 08:58 PM
RE: High Speed Flutter -Help!
 
Is that electric? If so, you can use carbon rods.... or you could slow it down.

j.duncker 03-08-2009 12:23 AM
RE: High Speed Flutter -Help!
 
OH YEAH

I forgot to mention that if you have had flutter and your model has not self destructed you have been LUCKY.

Fix it or fly it more slowly if you want to keep it!

jrcaster 03-08-2009 03:13 AM
RE: High Speed Flutter -Help!
 
Or the other option. Buy an airplane that is designed to go faster.

yetti831 03-08-2009 07:24 AM
RE: High Speed Flutter -Help!
 
Yes, it is electric. I have used carbon rods as shown in MinnFlyer's picture.

Sorry, there is no chance that I am slowing down [:-] Half of the joy I get is from the fact that I probably have the fastest Wild Hawk in world at the moment. :D And even if it breaks into a million pieces, I can buy a new one down the street for 79 dollars.


I have a (5.2mm) x 31.5 carbon rod running through the wings, one running through the fuse, and one running through the horizontal stab, along with the carbon reinforcements shown above in the picture.

I'm having a blast with this thing!


Thanks again!


P.S. Can someone suggest a high speed foamy that isn't too small? My eyes aren't the best.

CGRetired 03-08-2009 01:23 PM
RE: High Speed Flutter -Help!
 
right. :eek: When is the last time you read the AMA Membership Manual.


AMA Member Responsibility

This paragraph states, in part:

It is of the utmost importance that we AMA members observe, first of all, the safety rules of our particular sport. Each of us is hurt when carelessness causes an accident, hindering model aviation’s progress The safety rules may seem to be designed to obstruct your enjoyment of this sport, but some guidelines must be set if we are to prove ourselves to be the responsible people we proclaim ourselves to be.

It is not a sign of intelligence or skill to be able to fly among or above others [fly over, in other words]…..

It is to your personal benefit to make certain that no action on your part will result in an accident. The temptation to show off your “flying skills” increases in direct proportion to the number of those [around you]. While demonstrating… it does no good to scare someone.
Fluttering is dangerous. You never know when that plane will come apart on you. Most likely, you have already done enough damage to the airframe that no matter what you do to it, if you fly beyond the design limits of that airframe, it, most likely, will come apart. If it hits someone, you are liable.

There are several steps that everyone should take when flying RC. The first and foremost is to remain safe and to avoid any possibility or any chance of hurting someone by your neglegence. That includes, among other things, range checking, insuring that the plane is airworthy (which includes futter which is not normal situation)... as I said, among other things.

Do yourself a favor and get yourself a copy of the 2009 AMA Handbook and read it.

CGr

TedMo 03-08-2009 04:25 PM
RE: High Speed Flutter -Help!
 
Flutter normally occurs from the control surfaces so no matter how reinforced you make the stab and/or wing it will still occur. The ailerons and elevator or both are what's fluttering. Get yourself a plane that is built for the speed at which you wish to fly.

MinnFlyer 03-08-2009 05:13 PM
RE: High Speed Flutter -Help!
 

ORIGINAL: TedMo

Flutter normally occurs from the control surfaces so no matter how reinforced you make the stab and/or wing it will still occur.
Not really.

But you're right, if you want a plane to go fast, get a plane that's designed for it.


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