Today's Message Index:
----------------------
1. 01:52 AM - Re: Valley Engineering Big-Twin - Any one flying with one? (John Bickham)
2. 06:13 AM - Re: Matco brake fluid specs (Thom Riddle)
3. 06:52 AM - Re: Valley Engineering Big-Twin - Any one flying with one? (Thom Riddle)
4. 06:54 AM - Re: Matco brake fluid specs (John Hauck)
5. 06:56 AM - Re: Valley Engineering Big-Twin - Any one flying with one? (Thom Riddle)
6. 07:03 AM - Re: Monument Valley 2010 (Jimmy Young)
7. 07:20 AM - Re: Re: Alternitive Kolb Engines (Richard & Martha Neilsen)
8. 09:45 AM - Sun & Fun (Watkinsdw)
9. 10:15 AM - Re: Re: Valley Engineering Big-Twin - Any one flying with one? (Dana Hague)
10. 10:19 AM - Re: Sun & Fun (John Hauck)
11. 11:07 AM - Re: Valley Engineering Big-Twin - Any one flying with one? (Thom Riddle)
12. 11:36 AM - Re: Re: Monument Valley 2010 (John Hauck)
13. 03:11 PM - Re: Kolb Flyins (Richard & Martha Neilsen)
14. 03:19 PM - Cockpit storage cover Fire Fly (lhaggerty)
15. 03:19 PM - Sun & Fun (lhaggerty)
16. 03:54 PM - Firefly full enclosure (Bob Kravis)
17. 04:14 PM - Re: Alternitive Kolb Engines (Arksey@aol.com)
18. 05:02 PM - Re: Sun & Fun (Sky Biker Richardson)
19. 05:10 PM - 4130 steel and rockwell hardness (Jason Omelchuck)
20. 06:02 PM - Re: 4130 steel and rockwell hardness (John Hauck)
21. 06:02 PM - Re: 4130 steel and rockwell hardness (Dana Hague)
22. 06:03 PM - Re: Firefly full enclosure (Herb)
23. 06:04 PM - Re: Firefly full enclosure (Larry Cottrell)
24. 06:18 PM - Re: Sun & Fun (Watkinsdw)
25. 06:38 PM - Re: 4130 steel and rockwell hardness (Mike Welch)
26. 07:05 PM - Re: 4130 steel and rockwell hardness (Jason Omelchuck)
27. 08:39 PM - Re: Firefly full enclosure (Ellery Batchelder Jr)
28. 10:22 PM - Noise Insulating Foam (John Hauck)
29. 10:40 PM - Re: 4130 steel and rockwell hardness (Eugene Zimmerman)
30. 10:50 PM - Re: Firefly full enclosure (Herb)
Message 1
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Subject: | Re: Valley Engineering Big-Twin - Any one flying with one? |
Don't know if you will find this useful.
http://www.youtube.com/watch?v=THo3IzhX9hI&feature=channel
this is video of Jimmy Y taking off from False River, LA.
not a lot of "leap into the air" for which Kolbs are known for.
Jimmy seems much happier with his HKS. Look forward to flying with him soon.
Not much flying these past 5 months. Rain, Rain, Rain.
--------
Thanks too much,
John Bickham
Mark III-C w/ 912UL
St. Francisville, LA
I know many pilots and a few true aviators. There is a distinct difference that
I have the greatest respect for.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=287601#287601
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Subject: | Re: Matco brake fluid specs |
If you don't have the Matco instructions/manual for your brakes go to their
website to get them. My Matco manual says to use 5606 fluid in their brakes
but the builder used ATF so that is what I continue to use. Seals for 5606
are compatible with ATF but once you start with one or the other don't
change.
Thom in Buffalo
Message 3
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Subject: | Re: Valley Engineering Big-Twin - Any one flying with one? |
...The result is the actual THP your engine/prop combination is producing. The
actual engine shaft horsepower is probably around 50% more than that, assuming
about 66% prop efficiency.
-Dana ...
Two questions, Dana:
1) By "power off" do you mean idle power or engine stopped?
2) Do you mean the result is the thrust horsepower at that airspeed at full throttle
climb? or some other specific regime?
My Slingshot at 65 mph climb and idle power glide are 900 fpm during normal summer
density altitudes. My typical flying weight is 825 lb.
900+900=1800
1800/60 = 30
30x825/550= 45 THP
45 THP x 2 = 90 BHP
With engine off and prop stopped the descent rate goes up to 1200 fpm.
1200+900=2100
2100/60=35
35x825/550=52.5 THP
52.5 THP x 2 = 105 BHP
My 80 hp at 3,300 rpm Jabiru engine produces about 75 hp at WOT climb at 3,000
rpm at 65 mph at sea level, a bit less during summer.
Maybe my prop is a lot more efficient than your assumption. Your thoughts?
--------
Thom Riddle
Buffalo, NY
Kolb Slingshot SS-021
Jabiru 2200A #1574
Tennessee Prop 64x32
I prefer the company of peasants because they have not been educated sufficiently
to reason incorrectly.
- Michel de Montaigne
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=287623#287623
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Subject: | Re: Matco brake fluid specs |
Thom R/Gang:
Check out paragraph 4 of Assembly Information:
http://static1.veracart.com/matco/item_pdfs/2665/document1.pdf
The way I read it, I can use darn near anything but automotive brake
fluid.
MATCO recommends: "ONLY red aircraft fluid (MIL-H-5606) or other
petroleum-based or silicone-based fluid should be used."
No need to spend extra money for something that is not going to do any
more for you than Walmart ATF. I have used ATF exclusively since my
first aircraft brakes in 1988 (Hegar) and MATCO, 1992.
john hauck
mkIII
Titus, Alabama
If you don't have the Matco instructions/manual for your brakes go to
their website to get them. My Matco manual says to use 5606 fluid in
their brakes but the builder used ATF so that is what I continue to use.
Seals for 5606 are compatible with ATF but once you start with one or
the other don't change.
Thom in Buffalo
Message 5
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Subject: | Re: Valley Engineering Big-Twin - Any one flying with one? |
OOOOPS!
I just looked at the last line of each of my examples and realized I multiplied
by 2 instead of 1.5 My bad.
45 thp x 1.5 = 67.5 bhp
52.5 thp x 1.5 = 78.75 bhp
Sorry for not proof reading better. Makes more sense now.
--------
Thom Riddle
Buffalo, NY
Kolb Slingshot SS-021
Jabiru 2200A #1574
Tennessee Prop 64x32
I prefer the company of peasants because they have not been educated sufficiently
to reason incorrectly.
- Michel de Montaigne
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=287626#287626
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Subject: | Re: Monument Valley 2010 |
Kolb List,
I said:
> I would have full confidence in my Firestar making the trip.
It's easy to recognize BS when it goes to print. I need to retract that statement
as I was momentarily suffering from keyboard flying. Though I am sure the Firestar
is capable, I am no more qualified to fly out west in high terrain than
the man in the moon. The highest ground I've ever flown over isn't more than
300' agl. I would, however, like to have the opportunity to give it a try one
year.
--------
Jimmy Young
Missouri City, TX
Kolb FS II/HKS 700
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=287628#287628
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Subject: | Re: Alternitive Kolb Engines |
Chris
Yes I forget about the Jabiru.
I'm relocating to the Oceana County Airport C04 when I return to Michigan
this spring. I will make a point to stop in to see you this summer. Looks
like you are about a hour away.
Maybe we could have a small Kolb flyin this summer. Get Steve S, Jim S, Ted
W, and you to fly over (also any one else that wants to join us). We could
start a annual fly the sand dunes and Lake Michigan shore line.
Do not archive
Rick Neilsen
Redrive VW Powered MKIIIC
----- Original Message -----
From: "ces308" <ces308@ldaco.com>
Sent: Friday, February 19, 2010 11:51 PM
Subject: Kolb-List: Re: Alternitive Kolb Engines
>
> Hello gang....FWIW....I have 99. 2 hrs of absolutely trouble free hrs on
> my A-2200 Jabiru engine...I get 1000-1100 fpm climb on my M3X...it is
> smooth as silk...3-4 gph fuel burn...and basically maintenance free...I
> change oil and filter every 25 hrs and other that the the first few
> required adjustments at the beginning,that has been it. No monkey business
> mounting it or re-drives...just put it on and prop it...
>
> Just my 2 cents worth...Hope to see some of you guys this summer !
>
> chris ambrose
> M3X/Jabiru A-2200 99.2 + hrs
> N327CS
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=287315#287315
>
>
>
Message 8
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Jeff and I are fixin' to go to S&F this April. We'll probably
attend Friday and Saturday. Would be fun to meet fellow
Kolbers. Anyone going?
Dave
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=287647#287647
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Subject: | Re: Valley Engineering Big-Twin - Any one flying with |
one?
Thom, power off would be prop stopped... there is still a significant
amount of thrust from an idling engine.
The thrust horsepower (I see you corrected the X2 to x1.5 in the later
message) calculated is the THP you're producing in the full power
climb. Actually there are some minor variations, since the stopped drag
has some small but significant amount of drag that isn't a factor when
under power, so to be strictly correct, you'd have to have a fully
feathered prop (or removed, but then I guess you'd have to do deadstick
glides of a mountaintop!).
The 1.5 factor is from a VERY off the cuff guesstimate of 66% prop
efficiency. I have no idea what it really is... but if you calculate as I
described and know the exact BHP of your engine, you can calculate the
exact prop efficiency (or combined prop/redrive if the engine specs give
BHP before the redrive). Sounds like I was pretty close, though.
The power off rate of sink at a given speed times the sink rate is the
"power deficiency"; this is the power required to maintain level flight at
that speed. Any excess power over that required for level flight, divided
by the weight, equals the climb rate, again at that same speed. To be more
technically correct, it's at that speed _and_ angle of attack... with a
high thrustline there will be trim issues with power that cause changes in
drag, for additional inaccuracy... it's an approximation, but as you can
see, a pretty good one. That 78.75 is close enough to 75 to be well within
the limits of error, even better if you figure the drag of the stopped
prop... 3.75HP is 15# drag at 65 mph, which is quite believable.
These both come from the same simple relationship: force X velocity / 550
= HP. It work for weight as the force and vertical speed, or thrust (=
drag) and airspeed (speed converted in both cases into ft/s and force in
pounds, of course).
-Dana
At 09:52 AM 2/22/2010, Thom Riddle wrote:
>Two questions, Dana:
>1) By "power off" do you mean idle power or engine stopped?
>2) Do you mean the result is the thrust horsepower at that airspeed at
>full throttle climb? or some other specific regime?
>
>My Slingshot at 65 mph climb and idle power glide are 900 fpm during
>normal summer density altitudes. My typical flying weight is 825 lb.
>900+900=1800
>1800/60 = 30
>30x825/550= 45 THP
>45 THP x 2 = 90 BHP
>
>With engine off and prop stopped the descent rate goes up to 1200 fpm.
>1200+900=2100
>2100/60=35
>35x825/550=52.5 THP
>52.5 THP x 2 = 105 BHP
>
>My 80 hp at 3,300 rpm Jabiru engine produces about 75 hp at WOT climb at
>3,000 rpm at 65 mph at sea level, a bit less during summer.
>
>Maybe my prop is a lot more efficient than your assumption. Your thoughts?
>
>--------
>Thom Riddle
>Buffalo, NY
>Kolb Slingshot SS-021
>Jabiru 2200A #1574
>Tennessee Prop 64x32
>
>
>I prefer the company of peasants because they have not been educated
>sufficiently to reason incorrectly.
> - Michel de Montaigne
>
>
>Read this topic online here:
>
>http://forums.matronics.com/viewtopic.php?p=287623#287623
>
>
--
Who's General Failure & why's he reading my disk?
Message 10
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Jeff and I are fixin' to go to S&F this April. We'll probably
attend Friday and Saturday. Would be fun to meet fellow
Kolbers. Anyone going?
Dave
So far, Rick Neilsen and I are flying planning on flying in and camping in
the UL area at the NE end of the UL strip.
I don't know how long I will stay, probably until I get bored.
You all planning on flying?
Looking forward to seeing everyone down there.
john hauck
mkIII
Tutus, Alabama
Message 11
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Subject: | Re: Valley Engineering Big-Twin - Any one flying with one? |
Thanks for the clarification, Dana.
I recognized where your were coming from once I saw the 550 figure, a number burned
into my gray matter over 4 decades ago. Many ways to skin this cat, and all
work pretty well with good numbers.
do not archive.
--------
Thom Riddle
Buffalo, NY
Kolb Slingshot SS-021
Jabiru 2200A #1574
Tennessee Prop 64x32
I prefer the company of peasants because they have not been educated sufficiently
to reason incorrectly.
- Michel de Montaigne
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=287670#287670
Message 12
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Subject: | Re: Monument Valley 2010 |
> I would have full confidence in my Firestar making the trip.
Jimmy Young
Jimmy Y/Gang:
No doubt in my mind Jimmy can fly to MV and back to Texas in his HKS powered
FS. He has already demonstrated he has what it takes to make long,
multi-day cross country flights in the FS when it was powered with the
Generac.
Frank Goodnight and Larry Cottrell have demonstrated to me the capabilities
of the HKS/FS at higher altitudes. Frank flew out of MV at 5200 feet MSL,
and Larry lives and flies out of his airstrip in the high country of SE
Oregon. Neither Frank nor Larry could be categorized as lightweights.
I admire those on the List that have the time, money, and guts, to load
their Kolbs with their camping gear, take off, point the nose towards their
destinations, sometimes days away, and experience the thrill and adventure
of living with and flying a little Kolb airplane.
Wil Uribe and Dave Rains, of El Paso, TX, have done some pretty impressive
multi-day cross country flights in their FS's.
I respect these Kolb adventurers.
john hauck
mkIII
Titus, Alabama
Message 13
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Thought I was responding to the full list but just to Chris trying
again...
Yes spring will be nice it has been extremely cold here in Florida.
Hope to have good weather for the flyin at Buchan (X36) flyin next week
end Feb 27,2010. Any one else flying in?
Do not archive
Rick Neilsen
Redrive VW Powered MKIIIC
----- Original Message -----
From: ces308@ldaco.com
To: Stephen Spence
Cc: Jim Swan ; Rick Neilson
Sent: Monday, February 22, 2010 12:38 PM
Subject: Re: Kolb-List: Re: Alternitive Kolb Engines
We could have a flyin at each of our base airports ! That will get
us some time in the air ! I can't wait for spring !
chris
-----Original Message-----
From: "Stephen Spence" <sspence801@sbcglobal.net>
Sent: Monday, February 22, 2010 12:05pm
To: "Chris Ambrose" <ces308@ldaco.com>, "Jim Swan" <Arksey@aol.com>,
"Rick Neilson" <neilsenrm@comcast.net>
Subject: Re: Kolb-List: Re: Alternitive Kolb Engines
Sounds good to me
-------------------------------------------------------------------------
---
From: Richard & Martha Neilsen <NeilsenRM@comcast.net>
To: kolb-list@matronics.com
Sent: Mon, February 22, 2010 10:19:41 AM
Subject: Re: Kolb-List: Re: Alternitive Kolb Engines
<NeilsenRM@comcast.net>
Chris
Yes I forget about the Jabiru.
I'm relocating to the Oceana County Airport C04 when I return to
Michigan this spring. I will make a point to stop in to see you this
summer. Looks like you are about a hour away.
Maybe we could have a small Kolb flyin this summer. Get Steve S, Jim
S, Ted W, and you to fly over (also any one else that wants to join us).
We could start a annual fly the sand dunes and Lake Michigan shore line.
Do not archive
Rick Neilsen
Redrive VW Powered MKIIIC
----- Original Message ----- From: "ces308" <ces308@ldaco.com>
To: <kolb-list@matronics.com>
Sent: Friday, February 19, 2010 11:51 PM
Subject: Kolb-List: Re: Alternitive Kolb Engines
>
> Hello gang....FWIW....I have 99. 2 hrs of absolutely trouble free
hrs on my A-2200 Jabiru engine...I get 1000-1100 fpm climb on my
M3X...it is smooth as silk...3-4 gph fuel burn...and basically
maintenance free...I change oil and filter every 25 hrs and other that
the the first few required adjustments at the beginning,that has been
it. No monkey business mounting it or re-drives...just put it on and
prop it...
>
> Just my 2 cents worth...Hope to see some of you guys this summer !
>
> chris ambrose
> M3X/Jabiru A-2200 99.2 + hrs
> N327CS
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=287315#287315
>
>
>
>
>
>
>
>
>
>
Message 14
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Subject: | Cockpit storage cover Fire Fly |
Where can I get one Pete
Message 15
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Thinking of volunteeing , any comments Pete Homosassa Fl
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Subject: | Firefly full enclosure |
Does anybody have information about or experience with the full windscreen
on a Firefly? Here in Maine it might make a difference 8 months of the
year. I wrote to Travis and he told me that it is a hingeless installation.
He said you can just lift it and slip into the cockpit - "like lifting the
sheet and getting into bed." That seems odd and a bit awkward. I would has
suspected a hinge along the left edge of the cockpit but what do I know?
From what few pictures I have found on the web, and the YouTube video of
the AmeriFly (great paint!) I can't tell very much. BTW Travis said adds 10
lbs.
Bob
Message 17
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Subject: | Re: Alternitive Kolb Engines |
Rick.
you have a good idea....set up the fly in and count me in...grandma
will be gald to get me out of the house by then. Lake Michigan shore line and
dunes sounds good....I will poke up Ted W
Jim swan
From: Richard & Martha Neilsen <NeilsenRM@comcast.net>
Sent: Mon, February 22, 2010 10:19:41 AM
Subject: Re: Kolb-List: Re: Alternitive Kolb Engines
--> Kolb-List message posted by: "Richard & Martha Neilsen"
<_NeilsenRM@comcast.net_ (mailto:NeilsenRM@comcast.net) >
Chris
Yes I forget about the Jabiru.
I'm relocating to the Oceana County Airport C04 when I return to Michigan
this spring. I will make a point to stop in to see you this summer. Looks
like you are about a hour away.
Maybe we could have a small Kolb flyin this summer. Get Steve S, Jim S,
Ted W, and you to fly over (also any one else that wants to join us). We
could start a annual fly the sand dunes and Lake Michigan shore line.
Do not archive
Rick Neilsen
Redrive VW Powered MKIIIC
do not archive
jim swan firestar ll 503 michigan
Message 18
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|
I volunteered a couple years ago and enjoyed it BUT if you camp out make s
ure you have a warm place to stay=2C I froze my**s off a few nights
From: lhaggerty@tampabay.rr.com
Subject: Kolb-List: Sun & Fun
Thinking of volunteeing =2C any comments Pete
Homosassa Fl
Message 19
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Subject: | 4130 steel and rockwell hardness |
Hello all,
I have searched the web, and I cannot find the a table that gives me the properties
for 4130 in different hardnesses.
My dilemma is that my steel gear came back from the heat treater at RC 49.8 to
RC 49.9. I had asked them for RC48 like all the successful gears out there.
The goal is to have a spring that will not break on hard impact but will bend.
I have no idea how much different 1.9 on the rockwell c scale makes.
I would love to find a chart for 4130 that states the properties for different
rockwell c hardnesses.
Regards
Jason
MKIII
Portland Oregon
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=287731#287731
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Subject: | Re: 4130 steel and rockwell hardness |
My dilemma is that my steel gear came back from the heat treater at RC
49.8 to RC 49.9. I had asked them for RC48 like all the successful gears
out there. The goal is to have a spring that will not break on hard impact
but will bend. I have no idea how much different 1.9 on the rockwell c
scale makes.
I would love to find a chart for 4130 that states the properties for
different rockwell c hardnesses.
Regards
Jason
Jason/Gang:
I don't have a chart.
48 Rockwell was the number I came up with many years ago after experimenting
with my first gear legs at 42 RC, which was what Maxair was using on their
4130 gear legs. These were way too soft. Those were the first 4130 heat
treated legs on a Kolb, 1987.
I think you will be in the ball park to bend and not break.
1.8 to 1.9 is not that much harder. Will probably make a better spring.
If it was my gear legs I would not be worried about them breaking.
I bent two of my gear legs at Mucho Lake, BC, in 2000, both 90 degrees
without breaking. I think my legs came out to 49 RC or close to it.
john hauck
mkIII
Titus, Alabama
Message 21
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Subject: | Re: 4130 steel and rockwell hardness |
At 08:10 PM 2/22/2010, Jason Omelchuck wrote:
>I have searched the web, and I cannot find the a table that gives me the
>properties for 4130 in different hardnesses.
>
>My dilemma is that my steel gear came back from the heat treater at RC
>49.8 to RC 49.9. I had asked them for RC48 like all the successful gears
>out there. The goal is to have a spring that will not break on hard
>impact but will bend. I have no idea how much different 1.9 on the
>rockwell c scale makes.
>
>I would love to find a chart for 4130 that states the properties for
>different rockwell c hardnesses.
49.9 is 253 ksi. 48 is 237 ksi
http://www.unified-eng.com/scitech/hardness/hardness.html
If you search for MIL-HDBK-5, it contains this and much more materials
information (it can be downloaded as a pdf, but I don't have time to find
the link).
-Dana
--
Make it idiot proof and someone will make a better idiot.
Message 22
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Subject: | Re: Firefly full enclosure |
Yep....just attach the .0625 lexan to the left side of the fuselage
and let it fold over the nose and the rear hoop... Works very
well.. On the Right side ...attach a 1//4 inch or so rod that is
aligned to go through a hole in the tab that the nose cone attaches
to...that holds/secures the lexan over the nose cone...Make some
sort of latch to batten down the right rear side... On the rear
hoop...attach the lexan to the hoop about three 8ths of the way
up... on the nose cone end attach the lexan about 3/4 ths the way
up the left side.. Make some sort of of cable stop to prevent the
lexan from being blown over the left side... while allowing it to
come up high enough for entry...Install a prop to hold the windscreen
open for entering... You will need to attach aluminum angle on both
sides running up the left side to prevent the lexan from
bowing...same for right side.. These should be long enough to just
fit the nose cone to bow attach point..
Clear as mud I know...but my tele prompter is broken....:-) Herb
At 05:51 PM 2/22/2010, you wrote:
>Does anybody have information about or experience with the full
>windscreen on a Firefly? Here in Maine it might make a difference 8
>months of the year. I wrote to Travis and he told me that it is a
>hingeless installation. He said you can just lift it and slip into
>the cockpit - "like lifting the sheet and getting into bed." That
>seems odd and a bit awkward. I would has suspected a hinge along
>the left edge of the cockpit but what do I know? From what few
>pictures I have found on the web, and the YouTube video of the
>AmeriFly (great paint!) I can't tell very much. BTW Travis said adds 10 lbs.
>Bob
>
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Subject: | Re: Firefly full enclosure |
I got a full enclosure from Kolb for my Firestar and it included the
metal hardware to attach to the top of the cage, a full sheet of lexan
and a alum tube. Basically you cut the lexan to fit over this hardware
and the nose cone in one piece and is secured on the other side of the
cage. In essence the lexan is secured on the left side of the cage, then
to the alum tube in the middle of the wind screen. You can lift the
right side to get in. I am still using the metal parts that they
supplied even though I have redesigned the lexan to a bit differently. I
did not use the alum piece in the center, even though you will
eventually get used to it.
You can manufacture and install a heat collector on the shroud of the
two strokes and pipe the heat into the cage for heat. Check the archives
Larry
Note: If you forward this email, please delete the forwarding history,
which includes my email address.
----- Original Message -----
From: Bob Kravis
To: kolb-list@matronics.com
Sent: Monday, February 22, 2010 4:51 PM
Subject: Kolb-List: Firefly full enclosure
Does anybody have information about or experience with the full
windscreen on a Firefly? Here in Maine it might make a difference 8
months of the year. I wrote to Travis and he told me that it is a
hingeless installation. He said you can just lift it and slip into the
cockpit - "like lifting the sheet and getting into bed." That seems odd
and a bit awkward. I would has suspected a hinge along the left edge of
the cockpit but what do I know? From what few pictures I have found on
the web, and the YouTube video of the AmeriFly (great paint!) I can't
tell very much. BTW Travis said adds 10 lbs.
Bob
-------------------------------------------------------------------------
-----
Checked by AVG - www.avg.com
02/22/10 19:34:00
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We will probably drive up Thursday nite and stay in Tampa w/ friends, arrive Friday
AM. Hope you don't get bored early!
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=287743#287743
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Subject: | 4130 steel and rockwell hardness |
Jason=2C
If your steel gear was tested by the heat treater=2C and it came out to b
e 49.9 RH=2C then that's pretty darn close!!
My absolute favorite class in college was my Engineering Materials class!
! Now=2C THAT class was just plain fun!! We stretched steel rods until th
ey broke=2C we heat treated metals to check their Rockwell hardness=2C befo
re and after. We crushed 2" x 2" wooden blocks in a big press to determine
their resistance to collapse. We did all kinds of neat science lab tests
to investigate all kinds of materials. Heating metals and testing them was
part of the lab work. It was also fun.
Like I said=2C I tested some steel samples for their Rockwell Hardness pr
operties. Simple test=2C too. You slam a little tiny super hard steel bal
l against a surface (from the testing rig). You then measure the dent diam
eter and determine on the Rockwell Scale what the hardness is. Soft metals
give big dents. Spring steel gives almost no dent.
If your steel legs came back at 49.9=2C then I'd personally relax=2C and
not worry about it.
I can't recall the exact numbers for spring steel=2C but it is a "range"=2C
like 42 RH to 65 RH.
1.9 is not much of a deviation.
Besides=2C Rockwell 48 is only an educated guess at what the best treatme
nt is for the gear legs=2C anyway. It could have just as easily Rockwell 5
0. There is=2C undoubtedly=2C a "range" of hardness that will work just fi
ne!!
In my opinion=2C you've got a set of mighty fine gear legs. Don't worry
about 'em. Unless=2C of course=2C you still have any holes to drill. In t
hat case=2C worry!
Best regards=2C
Mike Welch
MkIII
> Subject: Kolb-List: 4130 steel and rockwell hardness
> From: jason@trek-tech.com
> Date: Mon=2C 22 Feb 2010 17:10:11 -0800
> To: kolb-list@matronics.com
>
>
> Hello all=2C
>
> I have searched the web=2C and I cannot find the a table that gives me th
e properties for 4130 in different hardnesses.
>
> My dilemma is that my steel gear came back from the heat treater at RC 49
.8 to RC 49.9. I had asked them for RC48 like all the successful gears out
there. The goal is to have a spring that will not break on hard impact but
will bend. I have no idea how much different 1.9 on the rockwell c scale ma
kes.
>
> I would love to find a chart for 4130 that states the properties for diff
erent rockwell c hardnesses.
>
> Regards
> Jason
> MKIII
> Portland Oregon
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=287731#287731
>
>
>
>
>
>
>
===========
===========
===========
===========
>
>
>
_________________________________________________________________
Hotmail: Powerful Free email with security by Microsoft.
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Subject: | Re: 4130 steel and rockwell hardness |
Thanks for the quick reply guys.
Tomorrow I fly!
Jason
MKIII
Portland, OR
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=287749#287749
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Subject: | Re: Firefly full enclosure |
I have built a full encloser for a firestar1 & firestar 2 That will not
be a problem I have a welding / Machine shop and I am willing to help you
out all you have to do is buy the material
Ellery Batchelder Jr.
-----Original Message-----
From: Bob Kravis <bob.kravis@gmail.com>
Sent: Mon, Feb 22, 2010 6:51 pm
Subject: Kolb-List: Firefly full enclosure
Does anybody have information about or experience with the full windscreen
on a Firefly? Here in Maine it might make a difference 8 months of the
year. I wrote to Travis and he told me that it is a hingeless installati
on. He said you can just lift it and slip into the cockpit - "like liftin
g the sheet and getting into bed." That seems odd and a bit awkward. I
would has suspected a hinge along the left edge of the cockpit but what
do I know? From what few pictures I have found on the web, and the YouTu
be video of the AmeriFly (great paint!) I can't tell very much. BTW Travi
s said adds 10 lbs.
Bob
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Subject: | Noise Insulating Foam |
Hi Folks:
Recently, someone posted the name and a source for some thin noise
insulating self-adhesive foam. At the time, I did not see a requirement for
it, but now I do.
After rebuilding the mkIII center section with sheet metal and not lexan, I
am now flying in a true snare drum. Blamed it on my radio, my hearing, and
anyone else that was standing around, when I realized I had created a drum.
The 10.5 hour flight day returning from Homer Kolb's funeral almost killed
me. Not only was I deaf as a door knob, but the noise had beat the crap out
of me and I was worn out well before I saw Gantt IAP and home.
Need to get some and get the noise killed before I start serious flying in
April.
Thanks,
john hauck
mkIII
Titus, Alabama
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Subject: | Re: 4130 steel and rockwell hardness |
Jason & kolb gang
I'm still looking for a heat treater to do my three foot gear legs.
The last place I checked was the company that John H pointed me to in
New Jersey and they also told me three foot is too long for their
oven. I've checked with five different metal treating outfits and
they all gave me the same answer. They must all be using the same
heat treating equipment.
Gene Z
On Feb 22, 2010, at 8:10 PM, Jason Omelchuck wrote:
> >
>
> Hello all,
>
> I have searched the web, and I cannot find the a table that gives me
> the properties for 4130 in different hardnesses.
>
> My dilemma is that my steel gear came back from the heat treater at
> RC 49.8 to RC 49.9. I had asked them for RC48 like all the
> successful gears out there. The goal is to have a spring that will
> not break on hard impact but will bend. I have no idea how much
> different 1.9 on the rockwell c scale makes.
>
> I would love to find a chart for 4130 that states the properties for
> different rockwell c hardnesses.
>
> Regards
> Jason
> MKIII
> Portland Oregon
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=287731#287731
>
>
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Subject: | Re: Firefly full enclosure |
I think all the attachment tabs were on my fuselage... Herb
At 10:08 PM 2/22/2010, you wrote:
>I have built a full encloser for a firestar1 & firestar 2 That will
>not be a problem I have a welding / Machine shop and I am willing to
>help you out all you have to do is buy the material
>
>Ellery Batchelder Jr.
>
>
>-----Original Message-----
>From: Bob Kravis <bob.kravis@gmail.com>
>To: kolb-list@matronics.com
>Sent: Mon, Feb 22, 2010 6:51 pm
>Subject: Kolb-List: Firefly full enclosure
>
>Does anybody have information about or experience with the full
>windscreen on a Firefly? Here in Maine it might make a difference 8
>months of the year. I wrote to Travis and he told me that it is a
>hingeless installation. He said you can just lift it and slip into
>the cockpit - "like lifting the sheet and getting into bed." That
>seems odd and a bit awkward. I would has suspected a hinge along
>the left edge of the cockpit but what do I know? From what few
>pictures I have found on the web, and the YouTube video of the
>AmeriFly (great paint!) I can't tell very much. BTW Travis said adds 10 lbs.
>Bob
>
>
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>===================================
>tp://forums.matronics.com
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