Today's Message Index:
----------------------
1. 08:51 AM - On rudder counterweight (mppalmer@aol.com)
2. 09:30 AM - Re: Building Large Rudder for Glasair TD 1 (=?utf-8?B?cm9iaW4wMkBtaW5kc3ByaW5nLmNvbQ==?=)
3. 09:31 AM - Re: On rudder counterweight (Bob Granley)
4. 09:33 AM - Re: Building Large Rudder for Glasair TD 1 (Bob Granley)
5. 02:23 PM - Re: Building Large Rudder for Glasair TD 1 (Robert Buckthal)
Message 1
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| Subject: | On rudder counterweight |
IIRC, the factory said that the rudder was fairly stiff and they weren't too worried
about flutter. So they didn't prescribe a formula or a "balance beam" approach,
as they did with the ailerons and elevators. They just said to put a certain
amount of weight in the front. Dace Kirk built a rudder for his Glasair
III that has a large bottom section that protrudes below the fuselage. He used
to be the owner of Phoenix Composites. If you can contact him, perhaps he can
tell you how he "balanced" his rudder.
Message 2
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| Subject: | Re: Building Large Rudder for Glasair TD 1 |
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Message 3
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| Subject: | Re: On rudder counterweight |
I will give him a call. Thanks so much!
Bob
Sent from my iPhone
> On Feb 27, 2016, at 08:50, mppalmer@aol.com wrote:
>
>
> IIRC, the factory said that the rudder was fairly stiff and they weren't too
worried about flutter. So they didn't prescribe a formula or a "balance beam"
approach, as they did with the ailerons and elevators. They just said to put a
certain amount of weight in the front. Dace Kirk built a rudder for his Glasair
III that has a large bottom section that protrudes below the fuselage. He used
to be the owner of Phoenix Composites. If you can contact him, perhaps he
can tell you how he "balanced" his rudder.
>
>
>
>
Message 4
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| Subject: | Re: Building Large Rudder for Glasair TD 1 |
Cheers Robin. Good to hear fro you!
Bob
Sent from my iPhone
> On Feb 27, 2016, at 09:29, robin02@mindspring.com <robin02@mindspring.com>
wrote:
>
> Bob, check page D-142. It calls for 3/4 pound of lead on the internal cou
nter balance. Later a more precise dynamic balance is done with the tips. T
he assembly is balanced around a long hinge pin run through the short elevat
or attach points.
>
> As I recall, this protects from flutter up to 295 MPH. I remember you and
Bud tested that number in the RG prototype once.
>
> Robin Young 286YM
>
> Sent from my Smartphone
>
> ------ Original message------
> From: Bob Granley
> Date: Fri, Feb 26, 2016 2:02 PM
> To: glasair-list@matronics.com;
> Subject:Re: Glasair-List: Building Large Rudder for Glasair TD 1
>
> Thanks John.
>
> Think we are more concerned right now with the weight of the internal (fus
elage) counterweight that I can't seem to find that in the manuals. =46rom t
hat we should be able to determine how much we have to put in rudder. Lookin
g for the diagrams as well.
>
> Thanks
>
> Bob
>
> Sent from my iPhone
>
>> On Feb 26, 2016, at 09:58, jhb478 <jhb478@yahoo.com> wrote:
>>
>> Bob, Picked up a large rudder at a salvage yard several yrs ago, if I c
an get any measurements for you just let me know.
>>
>> John Bolding
>>
>>
>> From: Bob Granley <snaproll@whidbey.com>
>> To: glasair-list@matronics.com
>> Sent: Friday, February 26, 2016 11:06 AM
>> Subject: Glasair-List: Building Large Rudder for Glasair TD 1
>>
>> Hello all,
>>
>> I have finally hooked up with a group of very good fiberglass mentors and
we are getting close to finishing the large rudder for my early model tail d
ragger. In the original builders manuals I cannot find any info on the inter
nal counter weight as far as weight and arm length etc. Was there an update t
o the manual that included this info and described in more detail how the la
rge rudder was to be constructed? We are at the stage where we need to figur
e out counterbalance weights and could use a bit more info to get this right
. Is the method essentially the same as for the small rudder?
>>
>> Thanks so much!
>>
>> Bob Granley
Message 5
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| Subject: | Re: Building Large Rudder for Glasair TD 1 |
Are we all talking about the same thing? The original email asked about
the counterweight on a large rudder. Some of the replies seem to be
dealing with the elevator counterweights, a much different topic.
As I recall, the instructions were rather vague about the rudder weight.
When I spoke to Cliff he claimed the size of the weight didn't matter much
because the rudder is lightly loaded in flight, if it is loaded at all.
Therefore the plans/instructions were vague on purpose, because the rudder
is not likely to flutter regardless of the weight.
None of this applies to the elevators which need to be perfectly balanced
about the hinge line, except for the larger later version of the
elevators. But that's a much bigger topic since it seems we're discussing
rudders here.
Bob
kit 2125
On Sat, Feb 27, 2016 at 9:32 AM, Bob Granley <snaproll@whidbey.com> wrote:
> Cheers Robin. Good to hear fro you!
>
> Bob
>
> Sent from my iPhone
>
> On Feb 27, 2016, at 09:29, robin02@mindspring.com <robin02@mindspring.com>
> wrote:
>
> Bob, check page D-142. It calls for 3/4 pound of lead on the internal
> counter balance. Later a more precise dynamic balance is done with the
> tips. The assembly is balanced around a long hinge pin run through the
> short elevator attach points.
>
> As I recall, this protects from flutter up to 295 MPH. I remember you and
> Bud tested that number in the RG prototype once.
>
> Robin Young 286YM
>
> Sent from my Smartphone
>
> ------ Original message------
> *From: *Bob Granley
> *Date: *Fri, Feb 26, 2016 2:02 PM
> *To: *glasair-list@matronics.com;
> *Subject:*Re: Glasair-List: Building Large Rudder for Glasair TD 1
>
> Thanks John.
>
> Think we are more concerned right now with the weight of the internal
> (fuselage) counterweight that I can't seem to find that in the manuals.
> From that we should be able to determine how much we have to put in rudder.
> Looking for the diagrams as well.
>
> Thanks
>
> Bob
>
> Sent from my iPhone
>
> On Feb 26, 2016, at 09:58, jhb478 <jhb478@yahoo.com> wrote:
>
> Bob, Picked up a large rudder at a salvage yard several yrs ago, if I
> can get any measurements for you just let me know.
>
> John Bolding
>
>
> ------------------------------
> *From:* Bob Granley <snaproll@whidbey.com>
> *To:* glasair-list@matronics.com
> *Sent:* Friday, February 26, 2016 11:06 AM
> *Subject:* Glasair-List: Building Large Rudder for Glasair TD 1
>
> Hello all,
>
> I have finally hooked up with a group of very good fiberglass mentors and
> we are getting close to finishing the large rudder for my early model tail
> dragger. In the original builders manuals I cannot find any info on the
> internal counter weight as far as weight and arm length etc. Was there an
> update to the manual that included this info and described in more detail
> how the large rudder was to be constructed? We are at the stage where we
> need to figure out counterbalance weights and could use a bit more info to
> get this right. Is the method essentially the same as for the small rudder?
>
> Thanks so much!
>
> Bob Granley
>
>
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