Today's Message Index:
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1. 07:12 PM - Re: Re: Kolb Xtra weight. & balance (Brad Nation)
2. 07:18 PM - Kolb-List Digest: (Bob Green)
3. 07:23 PM - Re: Kolb-List Digest: (Mike Welch)
Message 1
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| Subject: | Re: Kolb Xtra weight. & balance |
I guess I didn't understand the process. I crunched some numbers using my we
ight as the pilot weight and indeed it brought the CG within range. As I did
n't have the correct ARM I'll be heading out to the hanger to get the real m
easurements and go from there.
Thanks for the visual aid spread sheet.
I measured the bottom of the wing including the flap to be 66", w/o flap, 50
". I looked at the builder's notes and his wing measurements are the same. L
ooking back at my post yes I did mix up the inches and %. (Probably didn't h
elp doing the typing on my iPhone. )
My Xtra has a Rotax 912 80 hp, BRS VLS ( it weights 18.6 lbs), tundra tires,
basic instruments, nothing out of the ordinary, as far as I can tell from m
y limited experience with Xtras, so I agree that the weight is high. The que
stion is why, we're the scales crappy, was I maxing out the scales, did I we
igh it incorrectly, or does it really weigh that much.
When I weighed it I raised the tail so that the wing trailing edge was 7.5 i
nches lower than he leading edge. I lowered the wheels onto the scales vs. r
olling onto them. I repeated the process for each wheel at least 4 times unt
il I got a couple consistent weights on each wheel.
It seems that I need to go and remeasure and get an accurate higher capacity
set of scales.
Sent from my iPad
Brad
On Sep 2, 2013, at 15:00, Richard Girard <aslsa.rng@gmail.com> wrote:
> Dang it, hit return before I was ready. Attached is the spread sheet for a
n Xtra. Put 0 into pilot weight in the last section and you'll see the CG is
too far aft. You must figure in the pilot weight at some minimum to get the
CG into range.
>
> Rick
>
>
> On Mon, Sep 2, 2013 at 3:49 PM, Richard Girard <aslsa.rng@gmail.com> wrote
:
>> Brad, Okay, I don't understand what you're saying here. Are you worried t
hat the empty CG is too far aft? If that's the case you don't understand the
process.
>> You HAVE to know the arm to the pilot seat. With that info you can then c
alculate the minimum pilot weight, in order to get the CG into the aft end o
f it's range, and maximum pilot and passenger weight to keep the CG from run
ning out the forward end of the range.
>> Consider the Blanik L-13 sailplane. It's empty CG is at 78% of chord. Put
a 150 lb pilot into the front seat and the loaded CG comes into the aft end
of the range.
>>
>> Rick Girard
>>
>>
>> On Mon, Sep 2, 2013 at 11:45 AM, <nationcap@comcast.net> wrote:
>>> If I add me to the weight then I'm not calculating the empty weight and t
he CG be off, even though it's not within range now which is the problem. I h
aven't measured the arm for the seats so I don't know how much off it will b
e. But just looking at it it looks like the seats are pretty close to the da
tum point.
>>>
>>> I tried to using regular scales but they were very inaccurate , I lastl
y used two digital bathroom scales with a 2x6 but I could only get one of th
e scales to register.
>>> At first I rolled onto the scales but I wasn't confident in the reading t
hat I started over and lowered the wheels onto the scales. But even then I w
as getting inconsistent readings.
>>> So for now the weight seems heavy with an aft out of range CG. As for a
dding the pilot to the basic equation, I'll crunch some numbers and see if t
hat might make a difference.
>>>
>>> Thanks shine for all the input.
>>>
>>> Brad
>>>
>>> Sent from Xfinity Connect Mobile App so there may be some typos.
>>>
>>> -----Original Message-----
>>> From: racerjerry
>>> To: kolb-list
>>> Sent: September 2, 2013, 8:32
>>> Subject: Kolb-List: Re: Kolb Xtra weight. & balance
>>>
>>>
>>> Oh; remember to put your ass in seat before weighing. I am afraid that y
ou will need someone else to read the scales. With my lighter Firestar II, I
purchased 3 flat top $10 bath scales from Walmart and had no trouble at all
with weighing.
>>>
>>> Especially when using bathroom scales, you need to take care not to side
load the scales or it will distort readings. What I did was pick up one ma
in wheel and gently lay it back down on the scale. This keeps a toe error f
rom causing a side load when rolling on to the scales (changing distance bet
ween main wheels).
>>>
>>> I am sure you can get one of your local stock car guys interested enough
in your project to pay a visit and bring along their digital scales; the sc
ales are very portable and easily set up. A cold case of beer can work wond
ers with racers; just make sure it comes out afterwards.
>>>
>>> --------
>>> Jerry King
>>>
>>>
>>>
>>>
>>> Read this topic online here:
>>>
>>> http://forums.matronics.com/viewtopic.php?p=407923#407923
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>> <pre><b><font size=2 color="#000000" face="courier new,courier">
>>>
>>> ==========
>>> om/Navigator?Kolb-List" target="_blank">http://www.matronics.com/Navig
ator?Kolb-List">http://www.matronics.com/Navigator?Kolb-List</a>
>>> ==========
>>> s.com" target="_blank">http://forums.matronics.com">http://forums.matr
onics.com</a>
>>> ==========
>>> le, List Admin.
>>> om/contribution" target="_blank">http://www.matronics.com/contribution
">http://www.matronics.com/contribution</a>
>>> ==========
>>>
>>> </b></font></pre>
>>
>>
>>
>> --
>> Zulu Delta
>> Mk IIIC
>> Thanks, Homer GBYM
>>
>> It isn't necessary to have relatives in Kansas City in order to be unhapp
y.
>> - Groucho Marx
>
>
>
> --
> Zulu Delta
> Mk IIIC
> Thanks, Homer GBYM
>
> It isn't necessary to have relatives in Kansas City in order to be unhappy
.
> - Groucho Marx
>
> <Mark IIIX W and B.xlsx>
Message 2
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| Subject: | Kolb-List Digest: |
Hello Kolbers:
Can anyone tell me the required inside width and length of a trailer in which
to haul a MKIIIX with the wings attached and in the folded position?
Thank you all for any and all information and suggestions.
Bob
MKIIIX with GPAS VW
N830PB
Message 3
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| Subject: | Re: Kolb-List Digest: |
Bob,
You're going to need at least 24' long and probably every inch of 7' 6" wide,
inside measurements.
Mike
On Sep 8, 2013, at 9:20 PM, "Bob Green" <bgreen@bimi.org> wrote:
>
> Hello Kolbers:
> Can anyone tell me the required inside width and length of a trailer in which
to haul a MKIIIX with the wings attached and in the folded position?
> Thank you all for any and all information and suggestions.
> Bob
> MKIIIX with GPAS VW
> N830PB
>
>
>
>
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