What is the verdict on balanced control surfaces? Is flutter an issue with
the KR aircraft?
Regards,
Gary H.
GTU, TX
I think Wolfgang's description regarding Eigen Frequencies
is saying the same thing. Flutter is mechanical oscillation
with positive feedback. I recall learning about Eigenvalues
in linear algebra... but did not study aerospace or mechanical
engineering... I suspect that reducing the "Eigen Frequ
At 08:03 PM 3/22/2004 -0500, you wrote:
>Shouldn't the
>Ailerons balance each other, since if the left one goes down the right one
>goes up?
The ailerons, taken as a multi-body mechanical system, will naturally tend
to self-balance. This is not the same as balance for flutter consideration.
>Th
ly complex area. "Oscillations" was a mandatory
class in my studies, and almost everybody in my class hated it!!
Wolfgang
>
> From: Ross Youngblood
> Date: 2004/03/23 Tue AM 04:16:25 EST
> To: KRnet
> Subject: Re: KR> Balancing Ailerons
>
> I think Wolfgang&#x
Hi,
I'm assuming(?) that like all aircraft designers you performed your flutter
testing on the ground thru the use
of GVT ground vibration tests, and not by flying?
- Original Message -
From:
To: "KRnet"
Sent: Tuesday, March 23, 2004 8:54 AM
Subject: Re: Re: KR>
Page 89 shows the aileron balance arm. Nowhere can I find the length of the
arm. What should it be?
Page 95 shows a canopy latch & center pin diagram. Does anyone know what it
means, and how to use it?
Larry Severson
Fountain Valley, CA 92708
(714) 968-9852
lar...@socal.rr.com
Page 89 shows the aileron balance arm. Nowhere can I find the length of
the
arm. What should it be?
---
Larry
I'm at work , but pretty sure my control plan, (not KR Plan) says 5
inches
I'll double check for you.
Phillip Matheson
mathe...@dodo.com.au
Australia
VH
Page 89.
The trick (I discovered) with the aileron counter balance, is not to make
it TOO long. TOO long is defined as the point at which your counter
balance
hole hits the AFT SPAR (Bummer). This is dependant on where you attached
your aft aileron spar. So what you end up doing, is make the ar
Ross wrote:
>Also... from preflighting lots of C-152's you can see that Cessna uses
small spanwise triangular weights just FWD of the hinge line. This is much
more attractive than our giant lead arm... but weighs more.
Ross, Netters:
Along the same lines and stealing from Tony's books, I was
>Also... from preflighting lots of C-152's you can see that Cessna uses
> small spanwise triangular weights just FWD of the hinge line. This is
much
> more attractive than our giant lead arm... but weighs more.
>
> Ross, Netters:
>
> Along the same lines and stealing from Tony's books, I was thin
>Also... from preflighting lots of C-152's you can see that Cessna uses
> small spanwise triangular weights just FWD of the hinge line. This is
much
> more attractive than our giant lead arm... but weighs more.
>
> Ross, Netters:
>
> Along the same lines and stealing from Tony's books, I was thin
Allen wrote:
>...it is a lousy drawing - no allowance for down deflection of the aileron.
Allen,
The only allowance necessary is the 1/4" or so created by inserting the
hinge between the two pieces of spruce (see page 88 - Drawing 71 of the KR2
Plans). Keep in mind the down deflection is only 10
I reallly like that design... it's elegant!
It will be heavier as the moment arm is shorter... but it is elegant.
In my case... I ended up making my ailerons so heavy, that if I re-did
them and used your design, it would still be lighter than my current
ailerons...(possible summer project).
-- Ro
>Aren't fishing weights cheaper then bullets?
>The only allowance necessary is the 1/4" or so created by inserting the
>hinge between the two pieces of spruce (see page 88 - Drawing 71 of the K2
>Plans). Keep in mind the down deflection is only 10 degrees, which may not
>even need the full 1/4" g
>Aren't fishing weights cheaper then bullets?
>The only allowance necessary is the 1/4" or so created by inserting the
>hinge between the two pieces of spruce (see page 88 - Drawing 71 of the K2
>Plans). Keep in mind the down deflection is only 10 degrees, which may not
>even need the full 1/4" g
My aileron counterweights are 3/4" thinwall 4130 tubing filled with lead.
It was awfully easy to pick up a pile of free tire weights at the Firestone
store and melt them down in an old boiler on the hot plate. Takes a few
minutes to melt them, ladle off the road scum on top, and then you've got
y
literally dirt cheap
If you want lead real cheap, then go the the local gas station and pick up
an old battery. drain the acid, wash out the case, cut the case, take out
the lead, melt it down, take out the bits you don't want and pour the molten
lead into what ever shape you want.
As a kid we u
Sounds basically a good plan, Mark. A couple notes for others:
1. Take some care not to breathe the fumes when you play with
melting lead. I know that inhaled is much worse on the brain cells than
ingested (as from kids gnawing on windowsills painted with old
lead-based paint), and this soun
Rick Meyer wrote:
> Sounds basically a good plan, Mark. A couple notes for others:
> 1. Take some care not to breathe the fumes when you play with
> melting lead. I know that inhaled is much worse on the brain cells than
> ingested (as from kids gnawing on windowsills painted with old
> lead-bas
I do a lot of reloading and I cast a lot of lead. Your local tire shop is
a very good source for lead and they may, as in my case, give it away.
---Original Message---
From: Orma Robbins; KRnet
List-Post: krnet@list.krnet.org
Date: 03/19/04 23:27:03
To: Allen G. Wiesner; KRnet
Subject:
I made cast ballance weights for my ailerons. I found that a good way to
make a mold is to carve the shape you want out of foam then use it to make a
plaster of paris mold. Be sure to let the plaster of paris dry a few hours
then bake it in the oven for a while to be sure there is no moisture in
Hi Netters,
I followed the balancing discussion for some time now, and to through some
more fuel into the fire (or to just post a dumb question): Shouldn't the
Ailerons balance each other, since if the left one goes down the right one
goes up? I personally do not recall that we used balancing weig
To:
Sent: Monday, March 22, 2004 7:03 PM
Subject: KR> Balancing Ailerons
> Hi Netters,
>
> I followed the balancing discussion for some time now, and to through some
> more fuel into the fire (or to just post a dumb question): Shouldn't the
> Ailerons balance each other, si
Barry,
"Get the lead out". Move the engine forward. You can get a different
engine mount or make spools to go between the engine case and mount.
If you are going to balance your elevator, do it on the elevator. If you
are not a very fast plane, maybe it does not matter that much.
Balancin
RE:
What do you mean by "putting your rudder cables in a closed loop"?
Some people run separate rudder cables from pedal to rudder horn and
sometimes put a spring loaded tension cable between the two pedals.
I believe that you should have no spring in that tension cable, but rather,
a turn buc
I have read that not having some dampning in the cable transmits too much
shock load on the rudder post eventualy causing it to break. Any thoughts?
Thanks
Wayne
- Original Message -
From: Dan Heath
To:
Sent: Monday, October 27, 2003 4:30 AM
Subject: Re: KR>Balancing elevator.
RE:
W
I have read that not having some dampning in the cable transmits too much
shock load on the rudder post eventualy causing it to break. Any thoughts?
Yes,I think that's a strange story, and NOT an ELEVATOR issue.
Ron Freiberger
mailto: rfreiber...@swfla.rr.com
I believe that "closed loop" means that they put an extra cable from one
rudder pedal to a pulley on the firewall and back to the other pedal. It
serves to always keep the cable taught. Russ
> see KRnet list details at http://www.krnet.org/instructions.html
003 2:17 PM
To: KR builders and pilots
Subject: Re: KR>Balancing elevator.
I believe that "closed loop" means that they put an extra cable from one
rudder pedal to a pulley on the firewall and back to the other pedal. It
serves to always keep the cable taught. Russ
> see KRnet
Please
Can we change the SUBJECT TITLE when we change subject please.
It make it much easier to crack down latter
"Balancing Elevator has nothing to do with rudder cables"
Phil Matheson
mathe...@dodo.com.au
VH-PKR ( reserved)
61 3 58833588
See our VW Engines and Home built web page at
http://
My feeling about balancing the elevator is, think about the loss of each of the
control surfaces and what you could do to maintain control. AOPA Flight
Training magazine had a great article on this very subject, in an article
concerning emergency responses. If you lose the ailerons, you can stil
yeah I got thinking about what I have been working on and didn't realise my
we were talking elevators not ruders.
sorry
Wayne
- Original Message -
From: Ron Freiberger
To: KR builders and pilots
Sent: Monday, October 27, 2003 12:37 PM
Subject: RE: KR>Balancing elevator.
> S
Actually, we are talking elevator balancing, at least that is how the
conversation got started. I was talking about keeping the cables taught and
the subject went on to rudder cables.
Sorry for the confusion.
N64KR
Daniel R. Heath - Columbia, SC
da...@kr-builder.org
See you in Mt. Vernon - 2
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