Today's Message Index:
----------------------
1. 05:20 AM - Flight to Jordan Craters (Larry Cottrell)
2. 05:59 AM - Re: flight today (John Hauck)
3. 06:12 PM - Re: flight today (Jim Thomson)
4. 06:34 PM - Re: Re: The FireFly flies! (And it flies EXXCELLENT!) (Jim Thomson)
5. 07:51 PM - Re: The FireFly flies! (And it flies EXXCELLENT!) (Richard Pike)
Message 1
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| Subject: | Flight to Jordan Craters |
https://vimeo.com/226399752 password - owyheeflyer
Larry
--
*The older I get, the less tolerant I am of those who are intolerant of
others.*
*If you forward this email, or any part of it, please remove my email
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Message 2
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It is difficult to grasp how large the Jordan Craters are, how huge the
lava spout is, even when standing on it. Must have really been an eye
catcher when the lava was flowing.
Thanks for sharing.
john h
mkIII
Titus, Alabama
From: owner-kolb-list-server@matronics.com
[mailto:owner-kolb-list-server@matronics.com] On Behalf Of Larry
Cottrell
Sent: Thursday, July 20, 2017 8:35 PM
Subject: Kolb-List: flight today
I flew to Jordan Craters today so that I could get a video record with a
much better camera. I made a video some years ago but the camera only
had a resolution of 480 at the best. It is such a striking visual area
that I wanted to do it again. The flight was an hour and 36 minutes,
burning about 3.25 gallons of fuel. Average speed of 65, which was much
better than I expected. I actually got a bit chilly on the way back,
which was unusual to say the least.
I will upload the video tonight since my upload link is about 1MB . The
video unfortunately is about 9 minutes long. I cut as much out as I
could, unfortunately there is a lot that is worth seeing, at least I
think so. :-/ Here are some of the snapshots of the flight.
Larry
--
The older I get, the less tolerant I am of those who are intolerant of
others.
If you forward this email, or any part of it, please remove my email
address before sending.
Message 3
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| Subject: | Re: flight today |
Larry
Great pictures, I suspect any mono camera does not fully capture the
panorama. We all know piloting one's own aircraft is nearly magical. The
chill on your return, that is due to Global Warming.
Jim
Mk3 Pilot
On Fri, Jul 21, 2017 at 5:59 AM, John Hauck <jhauck@elmore.rr.com> wrote:
> It is difficult to grasp how large the Jordan Craters are, how huge the
> lava spout is, even when standing on it. Must have really been an eye
> catcher when the lava was flowing.
>
>
> Thanks for sharing.
>
>
> john h
>
> mkIII
>
> Titus, Alabama
>
>
> *From:* owner-kolb-list-server@matronics.com [mailto:owner-kolb-list-
> server@matronics.com] *On Behalf Of *Larry Cottrell
> *Sent:* Thursday, July 20, 2017 8:35 PM
> *To:* kolb-list@matronics.com
> *Subject:* Kolb-List: flight today
>
>
> I flew to Jordan Craters today so that I could get a video record with a
> much better camera. I made a video some years ago but the camera only had a
> resolution of 480 at the best. It is such a striking visual area that I
> wanted to do it again. The flight was an hour and 36 minutes, burning about
> 3.25 gallons of fuel. Average speed of 65, which was much better than I
> expected. I actually got a bit chilly on the way back, which was unusual to
> say the least.
>
>
> I will upload the video tonight since my upload link is about 1MB . The
> video unfortunately is about 9 minutes long. I cut as much out as I could,
> unfortunately there is a lot that is worth seeing, at least I think so. :-/
> Here are some of the snapshots of the flight.
>
> Larry
>
>
> --
>
> *The older I get, the less tolerant I am of those who are intolerant of
> others.*
>
>
> *If you forward this email, or any part of it, please remove my email
> address before sending.*
>
Message 4
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| Subject: | Re: The FireFly flies! (And it flies EXXCELLENT!) |
Gentlemen:
The propeller is by far the larges rotating mass and therefore the largest
potential for vibration. From your discussion I am confident your
propeller is out of balance. Swap in a known good propeller. I expect
your vibration will disappear.
Jim
Mk3 Pilot
On Wed, Jul 19, 2017 at 9:02 PM, Charlie England <ceengland7@gmail.com>
wrote:
>
> On 7/19/2017 9:06 PM, Richard Pike wrote:
>
>> >
>>
>> Prop weight is well within range for an A or B box, it is a new two blade
>> 64" Ivo, so that is minimal, but something is screwy with whatever we are
>> doing. We idled it up to 3,000 minimum and got rid of all the single
>> cylinder/gearbox shake at idle, but then trying to land it was a pain -
>> float and float some more. So idled it back down to 2,200 so you can slow
>> down on approach and then throttle it right back up to 3,000 once you get
>> down and settled. So you only have a few moments of excessive shake.
>>
>> But that is not the problem; the problem is that even when it is running
>> comparitively smoothly @ 3,000 rpm or over, this thing simply vibrates way
>> more than any airplane or U/L I have ever flown, something is not right.
>>
>> The little engine runs fine, flew it a short 30 mile cross country this
>> evening from the big grass strip where we did our test flights to the field
>> where it will be living for the next few months, and the only rpm that
>> doesn't vibrate excessively is right at 5,200, everything else you can feel
>> the vibration all through the airframe.
>>
>> Something Dave pointed out is that when we first got this airplane it had
>> a 447 on it; after we put the airframe back together and ran it up, that
>> engine vibrated excessively just like this one does. I am starting to
>> wonder about our Lord mounts.
>>
>> But right now we are open to all suggestions. Tomorrow I'll post some
>> pictures of the engine/mounts, etc.
>>
>> --------
>> Richard Pike
>> Kolb MKIII N420P (420ldPoops)
>> Kingsport, TN 3TN0
>>
>> Richard,
>
> I don't remember seeing many UL/light plane guys talk about prop balance;
> particularly dynamic balance. But it might be worth a look, especially if
> an EAA chapter nearby has a dynamic prop balancer for loan or rent (ours
> does, here in central MS).
>
> What you're describing could easily be caused by prop imbalance. It's the
> nature of the beast that we notice lower frequency vibes, but are not
> sensitive to higher frequencies. So your vibe may be there all across the
> rpm spectrum, but you just can't feel it when the engine's running at
> higher rpm.
>
> There's also the issue of resonance. Your particular combination of prop,
> gearbox, engine, airframe, mount cushions, etc may be near its system
> resonance in the range they you're able to idle the engine effectively. Any
> imbalance may be conspiring with a possible resonant freq that's near your
> idle rpm to give you severe vibes in that range.
>
> Without actual data it's just wild speculation, but something to consider.
>
> Charlie
>
> ---
> This email has been checked for viruses by Avast antivirus software.
> https://www.avast.com/antivirus
>
>
Message 5
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| Subject: | Re: The FireFly flies! (And it flies EXXCELLENT!) |
Problem appears to be resolved. It was in how I had tied the muffler to the head
braces via the rubber exhaust hangers. I had them too tight, and it set up a
resonant interaction between the engine and the muffler. Consequently - during
a 1 hour flight - it broke 3 out of the 4 muffler hangars. These are the exact
same hangars I use on my MKIII, and typically they last several years, and
then I replace them just as a precaution, not because they are damaged or worn.
Ran it a bunch with the new rubber hangars this morning, vibration was about 90%
better, flew it a couple times while adjusting the aileron pushrods and resizing
the right aileron trim tab, and I think we are about to get it whipped.
We would like to change the muffler configuration: if anybody has a Rotax straight
exhaust expansion cone (A- "Straight" Exhaust in the attachment) and you
want to sell it, let me know.Would also consider a "C" exhaust as in the jpeg.
--------
Richard Pike
Kolb MKIII N420P (420ldPoops)
Kingsport, TN 3TN0
Forgiving is tough. Being forgiven is wonderful.
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