Today's Message Index:
----------------------
1. 04:25 AM - Caution Ebay Fraud (N27SB@aol.com)
2. 08:18 AM - Possums (Dave & Eve Pelletier)
3. 08:32 AM - best lift to drag speed. (boyd young)
4. 09:58 AM - Considering to buy second hand Kolb MK3: Where to watch out for? (pollus)
5. 11:44 AM - Re: Considering to buy second hand Kolb MK3: Where to watch out for? (Richard & Martha Neilsen)
6. 04:05 PM - Re: best lift to drag speed. (David Paule)
Message 1
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| Subject: | Caution Ebay Fraud |
--> Kolb-List message posted by: N27SB@aol.com
I find a lot of my Kolb tools and materials on Ebay. Lately I have been
getting request to update my personal info. These emails look like they are real
Ebay. All of them were fake. You can tell by forwarding them to spoof
@ebay.com. You will get a rapid respnse from ebay.Ebay does not ask for your pesonal
info via their request. Retun links are easy to fake.
Be careful
Steve
do not archive
Message 2
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--> Kolb-List message posted by: "Dave & Eve Pelletier" <pelletier@cableone.net>
Possums,
Please e-mail me off list ASAP. You may have a problem.
AzDave
Do Not Archive
Message 3
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"Kolb-List Digest Server" <kolb-list-digest@matronics.com>
| Subject: | best lift to drag speed. |
0.00 THE_BEST_RATE BODY: The best Rates
--> Kolb-List message posted by: "boyd young" <by0ung@brigham.net>
-------------------
if you change props with different efficiencies you will change the climb
rate
but not the best climb speed. the best lift to drag speed will remain
the
same wether going uphill with power or downhill in glide.
boyd
-----------------------
Boyd,
The speed that gives you the best rate of climb changes because the prop's
efficiency curve moves its peak efficiency to a higher or lower speed. That
means that the maximum excess power is at a different speed than it was
previously. Might not be much, but it's there if you look for it.
You'll also find that the best L/D speed changes with prop pitch and whether
the prop is turning or not. Again, it might not be much, but it's there.
Dave Paule
Boulder, CO
FSII
---------------------
dave
I don't think so but I could be proven wrong....... the best L/D ratio is the speed
in which there is the most lift for the least amount of drag.... going faster
or slower will cause the drag to increase causing more energy to be used
up in overcoming the drag, and less energy available for climb. or extending
the glide.
examples.
now if you have a prop with poor efficiency the best climb rate will be at the
best L/D speed. and the climb rate will be slow say for example 200 ft/min. if
you fly faster or slower than best L/D speed the climb rate will be less than
200 ft/min
if you have a very hi efficiency prop then the best climb will still be at the
best L/D speed but the climb rate will be higher lets say 1500 ft/min if you
fly faster or slower than best L/D speed your climb would be less than 1500 ft/min
the rate of climb in the two examples is different but the speed to achieve them
is the same.
now just a bit slower than the best rate of climb is the best angle of climb. at
the best angle of climb is used for clearing an obstacle at the end of the runway....
even though you are not climbing as fast as the best rate you are covering
the ground slower as well and the angle is steeper. again faster or slower
than the best angle of climb will give you a lesser angle of climb.
if I am not mistaking the best L/D speed of an aircraft does not change, but the
rate of climb certainly would with different props.
john w, you seem to have a good handle on this.... if I have not explained this
correctly or clearly please further my education, and I will take no offence.
boyd
Message 4
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| Subject: | Considering to buy second hand Kolb MK3: Where to watch out |
for?
--> Kolb-List message posted by: pollus <pollus@fornerod.nl>
Dear Kolbers,
I am considering to buy the one and (presumably) only Kolb MK3 in
Germany, from the man who built the plane some 10 years ago and got
it's type registration through German administration. Only for that the
man deserves a statue. Now this man is old and lost his medical, so
there I am looking at a plane without someone to test fly it for me.
I am whise enough not to try to fool around with the thing without a
proper instruction, but getting the CFI to travel half of germany to
look at the plane might double the acquisition costs. So I want to buy
it cheep and howl the plane to my field.
Thanks to the design, it's easy to look at the structure, cables and
all the push-pull rods. The only problem is: I don't know where to look
for. I have a bachelor in Physics but that nowhere gets me to the point
of being a flight mechanic. This day I taxied the kolb around, listened
at the engine (582) and even dared to hop some inches above the grass.
That felt good, but that is not yet flying...
So here is my question, for I think you Kolb-builders know things.
From experience.
From doing it yourself.
So please enlighten me: what are the weak spots that have to be checked?
Regards,
Pollus Fornerod
Enschede - the Netherlands
Message 5
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| Subject: | Re: Considering to buy second hand Kolb MK3: Where to watch |
out for?
--> Kolb-List message posted by: "Richard & Martha Neilsen" <NeilsenRM@comcast.net>
Pollus
Hopefully you will get more responses but generally there are no weak spots
on this airplane if it is built properly. There is one report of fatigue
cracking of the tail post above and below the fuselage tube on a high time
(2300 hrs. or was that 4300 hrs. +) airplane. There are always discussions
about the gear legs bending but they are fine when landed correctly. These
airplanes slow down faster than some new pilots are used to when landing and
they drop them in bending the gear legs. The only weak point might be the
582 but I don't like 2 stroke engines so you can take that comment as you
wish.
Depending on how much this airplane has been flown you could find that is in
almost new condition. These planes have a record of great strength. In fact
the former owner of the company went out and intentionally abused an older
model of the airplane in flight and was finally able to get a wing to fail.
He then parachuted down, located, and fixed the weak spot in the wing for
all future Kolbs. You will not go wrong with this airplane,
Rick Neilsen
Redrive VW powered MKIIIc
----- Original Message -----
From: "pollus" <pollus@fornerod.nl>
Subject: Kolb-List: Considering to buy second hand Kolb MK3: Where to watch
out for?
> --> Kolb-List message posted by: pollus <pollus@fornerod.nl>
>
> Dear Kolbers,
>
> I am considering to buy the one and (presumably) only Kolb MK3 in
> Germany, from the man who built the plane some 10 years ago and got
> it's type registration through German administration. Only for that the
> man deserves a statue. Now this man is old and lost his medical, so
> there I am looking at a plane without someone to test fly it for me.
>
> I am whise enough not to try to fool around with the thing without a
> proper instruction, but getting the CFI to travel half of germany to
> look at the plane might double the acquisition costs. So I want to buy
> it cheep and howl the plane to my field.
>
> Thanks to the design, it's easy to look at the structure, cables and
> all the push-pull rods. The only problem is: I don't know where to look
> for. I have a bachelor in Physics but that nowhere gets me to the point
> of being a flight mechanic. This day I taxied the kolb around, listened
> at the engine (582) and even dared to hop some inches above the grass.
> That felt good, but that is not yet flying...
>
> So here is my question, for I think you Kolb-builders know things.
> From experience.
> From doing it yourself.
>
> So please enlighten me: what are the weak spots that have to be checked?
> Regards,
>
> Pollus Fornerod
> Enschede - the Netherlands
Message 6
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| Subject: | Re: best lift to drag speed. |
0.00 THE_BEST_RATE BODY: The best Rates
0.00 FORGED_RCVD_HELO Received: contains a forged HELO
--> Kolb-List message posted by: "David Paule" <dpaule@frii.com>
Boyd,
You are implicitly assuming that the prop has a constant efficiency for all speeds.
Unfortunately, especially for fixed-pitch props, they don't.
Their efficency varies significantly with speed - that's why a climb prop and a
cruise prop have such different performance characteristics.
Aircraft climb is essentially the power delivered by the prop minus the power required
by the aircraft. Both must be considered, not just the aircraft side of
the equation.
Regards,
Dave Paule
Boulder, CO
FSII
----- Original Message -----
From: boyd young
To: David Paule ; Kolb-List Digest Server
Sent: Sunday, October 31, 2004 9:18 AM
Subject: best lift to drag speed.
-------------------
if you change props with different efficiencies you will change the climb
rate
but not the best climb speed. the best lift to drag speed will remain
the
same wether going uphill with power or downhill in glide.
boyd
-----------------------
Boyd,
The speed that gives you the best rate of climb changes because the prop's
efficiency curve moves its peak efficiency to a higher or lower speed. That
means that the maximum excess power is at a different speed than it was
previously. Might not be much, but it's there if you look for it.
You'll also find that the best L/D speed changes with prop pitch and whether
the prop is turning or not. Again, it might not be much, but it's there.
Dave Paule
Boulder, CO
FSII
---------------------
dave
I don't think so but I could be proven wrong....... the best L/D ratio is the
speed in which there is the most lift for the least amount of drag.... going
faster or slower will cause the drag to increase causing more energy to be used
up in overcoming the drag, and less energy available for climb. or extending
the glide.
examples.
now if you have a prop with poor efficiency the best climb rate will be at the
best L/D speed. and the climb rate will be slow say for example 200 ft/min.
if you fly faster or slower than best L/D speed the climb rate will be less than
200 ft/min
if you have a very hi efficiency prop then the best climb will still be at the
best L/D speed but the climb rate will be higher lets say 1500 ft/min if you
fly faster or slower than best L/D speed your climb would be less than 1500
ft/min
the rate of climb in the two examples is different but the speed to achieve them
is the same.
now just a bit slower than the best rate of climb is the best angle of climb.
at the best angle of climb is used for clearing an obstacle at the end of the
runway.... even though you are not climbing as fast as the best rate you are
covering the ground slower as well and the angle is steeper. again faster or slower
than the best angle of climb will give you a lesser angle of climb.
if I am not mistaking the best L/D speed of an aircraft does not change, but
the rate of climb certainly would with different props.
john w, you seem to have a good handle on this.... if I have not explained this
correctly or clearly please further my education, and I will take no offence.
boyd
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