Today's Message Index:
----------------------
1. 05:02 AM - Re: For the record... (Ernie)
2. 05:50 AM - polar inertia (HodgeJW@aol.com)
3. 06:17 AM - Re: For the record... (Brian Lloyd)
4. 06:19 AM - Re: polar inertia (Brian Lloyd)
5. 06:22 AM - Re: polar inertia (cjpilot710@aol.com)
6. 06:28 AM - Baffle pads (Tom Johnson)
7. 06:35 AM - Cowl Baffle Pads (Jeff Linebaugh)
8. 09:26 AM - war bird digest (Roger Baker)
9. 10:04 AM - Re: pictures of what each yak # looks like (PeteAbbott@aol.com)
10. 11:18 AM - Lycoming o.h.'s/ Van Bortel Airpower (brian olofsson)
11. 12:12 PM - [PLEASE READ] More What Listers Are Saying... (Matt Dralle)
Message 1
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| Subject: | Re: For the record... |
--> Yak-List message posted by: "Ernie" <ernest.martinez@oracle.com>
I California, do you guys do that sort of thing naked?? :)
Ernie
----- Original Message -----
From: "Barry Hancock" <barry@flyredstar.org>
Subject: Yak-List: For the record...
> --> Yak-List message posted by: Barry Hancock <barry@flyredstar.org>
>
>
> On Nov 18, 2004, at 11:58 PM, Sparky wrote:
>
> > Barry is doing diamond-stitch carpeting
>
> Well, it's actually diamond-stitch insulation (military style) AND
> carpeting with stainless kick plates. Cappuccino machine is on
> order.... ;)
>
> Just back from 2 days of L-39 flying...about 9 hours in all. What
> freakin' FUN it is to fly, I mean really fly, a jet! Something about a
> tactical pop up bomb run at 400 knots indicated with the cactus
> whistling by as you egress the target with jinking turns to avoid the
> return fire of the restless rabbits you just so rudely awakened! :)
>
> Barry
>
>
>
>
>
>
>
Message 2
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--> Yak-List message posted by: HodgeJW@aol.com
Hey Guys,
Anybody here know anything about polar inertia? After removing the radio
equipment from behind the rear seat I weighed the airplane and did a new weight
and balance. The good news is I saved almost 100 lb. The bad news is the plane
is now 1.5 inches too far foreword. My calculations show that I can either
put 18 lb. in the tail cone or 50 lb. on the old radio rack. Now of course I
would rather go with the 18 lb. in the tail, but I have heard a lot about this
polar inertia thing. The gist of it, if I understand correctly, is that
while normal moment can be calculated by weight x arm; inertia is weight x arm
squared. I think that adding that much weight to the tail could set up a
scenario where the rudder doesn't have enough authority to overcome autorotational
forces in a spin. This is supposedly what killed Art Scholl. Anybody heard
this before? Thanks.
Jay Hodge
Message 3
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| Subject: | Re: For the record... |
--> Yak-List message posted by: Brian Lloyd <brianl@lloyd.com>
On Nov 20, 2004, at 8:59 AM, Ernie wrote:
> --> Yak-List message posted by: "Ernie" <ernest.martinez@oracle.com>
>
> I California, do you guys do that sort of thing naked?? :)
Only if it feels good and I am channeling Erich Hartmann. Why do you
ask?
Brian Lloyd 6501 Red Hook Plaza
brianl@lloyd.com Suite 201
+1.340.998.9447 St. Thomas, VI 00802
There is a time to laud one's country and a time to protest. A good
citizen is prepared to do either as the need arises.
Message 4
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| Subject: | Re: polar inertia |
--> Yak-List message posted by: Brian Lloyd <brianl@lloyd.com>
On Nov 20, 2004, at 9:47 AM, HodgeJW@aol.com wrote:
> --> Yak-List message posted by: HodgeJW@aol.com
>
> Hey Guys,
>
> Anybody here know anything about polar inertia? After removing the
> radio
> equipment from behind the rear seat I weighed the airplane and did a
> new weight
> and balance. The good news is I saved almost 100 lb. The bad news is
> the plane
> is now 1.5 inches too far foreword. My calculations show that I can
> either
> put 18 lb. in the tail cone or 50 lb. on the old radio rack. Now of
> course I
> would rather go with the 18 lb. in the tail, but I have heard a lot
> about this
> polar inertia thing. The gist of it, if I understand correctly, is
> that
> while normal moment can be calculated by weight x arm; inertia is
> weight x arm
> squared. I think that adding that much weight to the tail could set up
> a
> scenario where the rudder doesn't have enough authority to overcome
> autorotational
> forces in a spin. This is supposedly what killed Art Scholl. Anybody
> heard
> this before? Thanks.
If you check the archives you will find I brought this up some years
ago. We put the question to Bushi Cheng, the aircraft designer and he
said that it would not be a problem, that there is ample VS and rudder
authority in the spin to deal with the increased polar moment of
inertia.
So put the 18 lbs in the tail.
Brian Lloyd 6501 Red Hook Plaza
brianl@lloyd.com Suite 201
+1.340.998.9447 St. Thomas, VI 00802
There is a time to laud one's country and a time to protest. A good
citizen is prepared to do either as the need arises.
Message 5
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| Subject: | Re: polar inertia |
--> Yak-List message posted by: cjpilot710@aol.com
In a message dated 11/20/2004 8:50:38 AM Eastern Standard Time,
HodgeJW@aol.com writes:
Hey Guys,
Anybody here know anything about polar inertia? After removing the radio
equipment from behind the rear seat I weighed the airplane and did a new
weight
and balance. The good news is I saved almost 100 lb. The bad news is the
plane
is now 1.5 inches too far foreword. My calculations show that I can either
put 18 lb. in the tail cone or 50 lb. on the old radio rack. Now of course I
would rather go with the 18 lb. in the tail, but I have heard a lot about
this
polar inertia thing. The gist of it, if I understand correctly, is that
while normal moment can be calculated by weight x arm; inertia is weight x
arm
squared. I think that adding that much weight to the tail could set up a
scenario where the rudder doesn't have enough authority to overcome
autorotational
forces in a spin. This is supposedly what killed Art Scholl. Anybody heard
this before? Thanks.
Jay Hodge
Jay,
Several years ago when Bushi Cheng (he designed the CJ-6) was our guest at
OSH, Brain Lloyd put the same question to him. He said it didn't matter. Brain
can put the details in at this point as to why, but I have all my ballast
(lead shot) in a bag in the tail cone. You save on weight and it's a very easy
mod. Doing acro regularly in my plane for the 10 years now has shown no
structure or handling problems. My acro is "Old man" stuff seldom needing to go
over 4g. Spins in this airplane are the least problem AS LONG as c/g limits are
kept just that - within limits.
Jim "Pappy" Goolsby
Message 6
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--> Yak-List message posted by: "Tom Johnson" <tjohnson@cannonaviation.com>
Baffle pads seal the front side of the cowl from the back side and help to push
every molecule of air through the cylinder cooling fins.
In the 1930s and 1940s the National Advisory Committee on Aeronautics figured out
all the stuff on cowlings.
One of the things they discovered is that any single molecule of air needs to either
be squeezed past the cooling fins or rejected back out the front of the
cowl.
In other words, any leaks or holes you have in your baffles, any of the holes in
the inter-cylinder baffles, or missing baffles are inefficient. You'll get
more efficiency by closing up those holes not letting that air escape to the back
side of the baffles, but instead let it spill back out of the front.
http://naca.larc.nasa.gov/reports/1939/naca-report-662/
For aspiring gearheads, the original NACA test reports from the 1920s through the
1940s are available at:
http://naca.larc.nasa.gov/
You can search for whatever you ever wanted to know.
The work done in the early 1900s is amazing.
Message 7
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| Subject: | Cowl Baffle Pads |
0.26 UPPERCASE_25_50 message body is 25-50% uppercase
--> Yak-List message posted by: "Jeff Linebaugh" <jefflinebaugh@earthlink.net>
Seems to me I remember one of the DVT guys finding a real great high temp
adhesive to use to attach the cowl pads.... It was a Dupont product as I
recollect...two part...don't recall the ID....perhaps one of them will pipe
up!....
Jeff Linebaugh
jefflinebaugh@earthlink.net
CJ-6P N621CJ
Memphis, TN
Message 8
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0.00 FROM_HAS_MIXED_NUMS From": yak-list@matronics.com
--> Yak-List message posted by: Roger Baker <f4ffm2@adelphia.net>
I went to warbirddigest.com and saw the nice picture of Jay Hodge's
beautiful 1883 Yak 52. Who'zat flyin' it?
Roger Baker
Message 9
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| Subject: | Re: pictures of what each yak # looks like |
--> Yak-List message posted by: PeteAbbott@aol.com
Hi all,
I'm new to the list and hear of all the different yak models but have no idea
of what some of them are. I have several books on "every plane made" but
there are few Yaks. Any web sites out there that address this???
Pete Abbott
N852GC
Yak 52
Message 10
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DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws;
s=s1024; d=yahoo.com;
b=qeZk97k+HdAefwZ6O07Bcmq2VJMZBqx7IJd2f3WqxHQlmIpOhtmwI6lKECnGZ7YGv3KfqfoYlAkXjtD9xVq4nfDahICfnsQQxVjHtSYcdQb7w34EEY7xCUiCvrJXY+AHGA4DMraBfs3yxP4nz3qbrRC6i6/eIxlo4brEp/D+KqA=
;
| Subject: | Lycoming o.h.'s/ Van Bortel Airpower |
--> Yak-List message posted by: brian olofsson <brian060901@yahoo.com>
If any of the members are also flat engine drivers, take notice. Lycoming drastically
changed it's core policy 10 months ago. For the last 15yrs Lycoming
has only had charge backs on "suspect/obviously damaged engines". Starting Jan.
of this year Lycoming has "vigorously" enforced its core policy, tracking all
parts thru production. End result is that their charge back rate has gone from
near zero to over 30%. That's right, if you buy/order a lycoming reman/overhaul
you have an over 30% chance of receiving a bill of an additional three to
eight thousand. These %'s are approx. numbers, the best I can receive from Lycoming.
For liability reasons Lycoming is declaring some cases that can be or
have been repaired by other shops unairworthy. (reportedly just an old DIVCO
stamp on your case can cost you $4,000). Please check these figures with Lycoming
(Mr. Palmeteir V.P. lycoming customer relations is a great source). In
my opinion the advantage of spending the extra for a
fact
engine has just disappeared. Lycoming is also reportedly refusing cases/cranks
just for the number of years since last O.H. at Lycoming. Most O.H. shops will
allow you to find a good yellow tagged case (if your's is not repairable)
to replace a cracked case. Lycoming is requiring you to buy a NEW case/crank
which they then put back in their inventory. Even if your case cracks because
it has been cycled too many times, fatigue crack, you get to buy lycoming a
new case. MERRY CHRISTMAS LYCOMING. Remember on a reman the engine log has been
0 timed, so you have no idea how many 2,000 hr cycles the case has on it when
you buy it. This happened on a fact. reman.sent in for reman.. This engine was
professionally flown had less than 2,000 hrs/5yrs on it and I believe had never
had a cylinder off. There were no leaks and the engine was changed because
of TBO @ the customers request. The request to get the case back for our inspection
was refused. $4,000 bill.
AIR POWER/Van Bortel is a company I WILL NOT USE. If you order a lycoming engine
from them they still INSIST that the core policy has not changed. In fact
the WRITTEN policy has not changed, much , It's just that the policy has not
been used for the last 15yrs. I consider this deceptive. Lycoming considers it
a material misrepresentation. Lycoming I'm convinced appropriately notifed Van
Bortel/Airpower. George Van Bortel's response,"what do you want me to do, warn
people of a possible charge and loose a sale???" Lycoming pointed out to me
Mr. Van Bortel's back ground as a used car dealer. (check it out on the Internet.)
If you do order thru Airpower I would arrange your own shipping of the
engine and check any "charge backs" with lycoming directly. Reportedly, Lycoming
is going to start a advertising campaign to "correct" these misrepresentations
but I haven't seen this yet. G&N, Omaha engines are just a couple of the
lycoming dealers you can trust, check it out on the
lycoming
sight.
In aviation I do not like surprises, or to be deceived. Please forward this
as you see fit. The more people are aware of this the better.
P.S. If you have had a similar problem Airpower/Van Bortel please contact me at
Brian060901@yahoo.com
---------------------------------
Message 11
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| Subject: | [PLEASE READ] More What Listers Are Saying... |
--> Yak-List message posted by: Matt Dralle <dralle@matronics.com>
Dear Listers,
We are nearing the end of this year's List Fund Raiser and I wanted to
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Matt Dralle
Matronics Email List Administrator
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