Today's Message Index:
----------------------
1. 07:56 AM - Re: Sonex or GP VW. (Richard Neilsen)
2. 01:03 PM - Re: Sonex or GP VW. (Thom Riddle)
3. 03:56 PM - Re: Kolb MkIIIc Kit for Sale (b d)
4. 04:49 PM - Re: US Sport Aviation Expo 2011 (John T. Schmidt)
Message 1
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Subject: | Re: Sonex or GP VW. |
Ron
Yes. I purchased a dune buggy tuned exhaust system, cheap and why reinvent
anything. I then modified it to fit, trying to keep all the tube lengths the
same. I removed the muffler and replaced it with a open pipe. I then sent it
out to have it ceramic coated inside and out. I think the system gives me
more power and is surprisingly quiet. The exhaust system was built for the
engine on its high mount. When I later did the lower engine mount to lower
the thrust line, the exhaust extended down into the gap seal a bit.
The system has almost 400 hours on it with no cracking so far. The standard
VW joint between the J pipes and the tuned system got loose after a few
hundred hours but is was a simple matter of buying a new joint kit and
replacing them. My theory is the standard VW exhaust pipe joint allows some
movement in the exhaust system to reduce stress on the system yet seal any
leaks.
Rick Neilsen
Redrive VW powered MKIIIC
On Mon, Dec 27, 2010 at 12:10 AM, Ron @ KFHU <captainron1@cox.net> wrote:
>
> Thanks
> Printed out the photo. Is that a tuned exhaust?
>
>
Message 2
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Subject: | Re: Sonex or GP VW. |
..."a 60" prop on my direct drive VW. I do know and my neighbors know a mile away
that the tipswent supersonic at around 2900 RPM"....
My Jabiru powered Kolb Slinshot w/ 64" diameter prop reaches about Mach .80 (sea
level std day Mach) at my normal cruise speed of 2725-2750 rpm and 85 mph TAS.
At WOT straight and level of 95 mph TAS and 3160 RPM, the prop tips are at
about .92 Mach. At 10,000' density altitude Mach 1 has decreased in terms of MPH
by only 3.5%. I'm having trouble seeing how a shorter prop (by 6.25%) will
reach Mach 1 at 3200 rpm at any normal Kolb airspeed, much less 2900. That said,
my prop is noisy at 2750 rpm (mach .8 or so) but a whole lot noisier at 3150
rpm.
My Calculations follow:
d = prop dia in inches
pi = 3.1416
r = rpm (prop)
s = airplane true airspeed
RS = Rotational Speed (mph)
TS = Tip Speed (mph) = RS + s
Mach 1 at sea level std day =~ 761 mph
RS = pi x d x r / 1056
RS = 3.1416 x 60 x 2900 / 1056 = ~518 mph
Tip Speed (TS) at say 85 mph would be ~603 mph or ~ .79 Mach.
That said, a tip speed above Mach .8 seems to me to get exponentially louder so
I would consider that a practical maximum for continuous operation, and one of
the reasons I cruise at that speed and not any higher. If I ever need to change
props, I will probably go to a shorter one like some of the Jab powered MkIII
guys use.
--------
Thom Riddle
Buffalo, NY (9G0)
Kolb Slingshot SS-021
Jabiru 2200A #1574
Tennessee Prop 64x32
Everyone is entitled to his own opinion, but not his own facts.
Daniel Patrick Moynihan
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=324708#324708
Message 3
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Subject: | Re: Kolb MkIIIc Kit for Sale |
You didn't mention an engine that I noted . . . . You did say $8,000 didn't
you? . . . .There is an engine with it for $8000 yes?
Do you have pics to show what I would get for $8000?
On Sun, Dec 26, 2010 at 8:05 AM, Arran <arran.addington@gmail.com> wrote:
>
> Merry Christmas Everyone! I have been a "lurker" for several years now on
> the list and have enjoyed the pictures and stories that everyone has
> contributed.
>
> A little over 3 years ago I bought a beautiful partially completed MkIIIc
> from a gentleman from Florida (it had been sealed up in an enclosed trailer
> since he moved south). Attached are some pictures. Besides a little dust
> from sitting in my garage since then it is in wonderful shape.
>
> After much thought, and sadness, I realize that I just don't have the
> resources, mainly time, to complete the kit and give it justice. I have a 4
> year old, and a new job that demand just about all my time. It needs a new
> home and I hope that someone on the list knows of someone in need of a
> MkIIIc.
>
> Here is what you get: The cage has been painted, the wings assembled, the
> control surfaces have been assembled, all of it almost ready for covering. I
> have a ton of parts, hardware, polyfiber information and chemicals, all the
> original blueprints and instruction manuals, as well as a Kunzelman LED
> strobe position light assembly still in the box (I paid $400 for it). Most
> importantly I have the original bill of sale from the factory to the first
> owner in 1992, and then another bill of sale to me back in 2007.
>
> The assembly, all done by the previous owner is absolutely top notch. I
> think he ran some sort of machine shop business and the craftsmanship shows.
>
> I am asking $8,000 for it which is less than I have in it. I think that is
> fair for what you would be getting. I live in Nashville, TN and would more
> than willing to help you load it up. You can reach me on my cell at
> 615-268-1409 or arran.addington@gmail.com I am more than happy to answer
> questions and take pictures, come on by if you like. I figured that I would
> offer it to the group first, and then if I don't hear anything I will put it
> up on Barnstormers next week. I appreciate your help, and hope someone knows
> where it can find a new home.
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=324548#324548
>
>
> Attachments:
>
> http://forums.matronics.com//files/kolb_pic_2_744.jpg
> http://forums.matronics.com//files/kolb_pic_1_153.jpg
>
>
Message 4
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Subject: | Re: US Sport Aviation Expo 2011 |
Happy and Safe Flying New Year to ALL.
The US Sport Aviation Expo 2011 is a great place to be in the Middle of January,
the weather over the past four years has always been great for most days of
the show..
Once again I will be exhibiting my AeroLIFE products (www.aerolifeindustries.com) and this year I am in booth spaces 105/106 in tent A. For this year I will have in attendance Graf von Glock as part of the show and as always we will be distributing the best Jelly Beans any one has ever tasted, I also have a drawing every day and free samples of my product Release And, for anyone who has struggled to remove Loctite 5910 from the Gear Box and engine of a 912 series Rotax engine AeroLIFEs Release completes the task in a matter of seconds.
So, stop by if you are at the show, meet Mr. Graf von Glock , pick up your free
sample of Release, enter the drawing and by all means dont forget the Jelly Beans
and if you have never been to Sebring in January for the show you are overdue
. Also, have a safe trip whatever your mode of transportation. See you at
the Show.
Sincerely,
John T. Schmidt, CFI
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=324725#324725
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