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Mk 3 Classic weight

 
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normros



Joined: 15 Sep 2017
Posts: 9

PostPosted: Sun Nov 05, 2017 7:21 am    Post subject: Mk 3 Classic weight Reply with quote

I bought a Mk3 classic a few months ago and have been trying to get it back onto the UK register. I have been told I need an up to date weight and balance. However when I weighed the A/C I found it had put on 35 kilos since it's last weighing.
It has been sitting unused for 4 years in a metal trailer - is it possible the fabric and/or airframe has absorbed moisture? Nothing (according to the log book) has been added since it's last weighing.
Weights are (first weight is latest, second in brackets is previous):-
Left wheel - 100 kilos (86 kilos)
Right wheel - 100 kilos (84 kilos)
Tail wheel - 30.5 kilos (29.8 kilos)
Given that the tail weights are pretty similar, all the gained weight would appear to be round the wings and cockpit where the majority of the fabric is.
Fuel in tanks has been allowed for.

Thanks, Norman


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rickofudall



Joined: 19 Sep 2009
Posts: 1298

PostPosted: Sun Nov 05, 2017 7:44 am    Post subject: Mk 3 Classic weight Reply with quote

Norman, After working on two Mk III's to get their weight down, you're plane's original weight of 200 Kg is completely bogus. The factory lists the weight of the IIIC as 497 lb (224 Kg) and that is VERY difficult to achieve. According to Travis at Kolb the average Mk IIIX comes in at 600 lb! (both empty weights assume a 582, not a 912) I'd say either the original weighing was done incompetently or it was deliberately falsified.

Rick Girard
On Sun, Nov 5, 2017 at 9:21 AM, normros <norm2mac(at)gmail.com (norm2mac(at)gmail.com)> wrote:
Quote:
--> Kolb-List message posted by: "normros" <norm2mac(at)gmail.com (norm2mac(at)gmail.com)>

I bought a Mk3 classic a few months ago and have been trying to get it back onto the UK register. I have been told I need an up to date weight and balance. However when I weighed the A/C I found it had put on 35 kilos since it's last weighing.
It has been sitting unused for 4 years in a metal trailer - is it possible the fabric and/or airframe has absorbed moisture? Nothing (according to the log book) has been added since it's last weighing.
Weights are (first weight is latest, second in brackets is previous):-
Left wheel - 100 kilos (86 kilos)
Right wheel - 100 kilos (84 kilos)
Tail wheel - 30.5 kilos (29.8 kilos)
Given that the tail weights are pretty similar, all the gained weight would appear to be round the wings and cockpit where the majority of the fabric is.
Fuel in tanks has been allowed for.

Thanks, Norman




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Rex Rodebush



Joined: 10 Jan 2006
Posts: 150
Location: Branson West area, Missouri

PostPosted: Sun Nov 05, 2017 7:51 am    Post subject: Re: Mk 3 Classic weight Reply with quote

Were the same scales used since last time? Has fuel been added since last time? Did the last guy add additional instrumentation or other stuff after he did the first weigh?

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normros



Joined: 15 Sep 2017
Posts: 9

PostPosted: Mon Nov 06, 2017 4:03 am    Post subject: Re: Mk 3 Classic weight Reply with quote

Rex - Different scales, but we used 3 different sets and they were all within .5 kilos of each other - a fuel weight allowance was deducted (except for unusable fuel) - nothing has been added (according to the aircraft log).

Rick - The UK has different "rules" than you folks, quote from the U.K. CAA (Civil Aviation Authority):-
"A microlight is an aeroplane designed to carry either one person or two people (and not more) and which has a maximum total weight authorised (MTWA) not exceeding 450 kg for a two seat landplane
A microlight must also have either a wing loading at the maximum weight authorised not exceeding 25 kg per square metre or a stalling speed at the maximum weight authorised not exceeding 35 knots calibrated speed."

A wingtip extension modification was cleared to increase the wing area to 15.6 square metres allowing a MAUW of 390 Kilos (860lbs).

I can't see the weights being falsified as they were done by two different LAA (Light Aircraft Association, the regulating body) Inspectors as was mine.

I don't have any paperwork on the original build, but the guy flew it with permits for 6 years.

There must be a very well fed family of mice living in the wings. Confused

Norman


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zeprep251(at)aol.com
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PostPosted: Mon Nov 06, 2017 5:53 am    Post subject: Mk 3 Classic weight Reply with quote

My friends mk3c with 582 was585# mine with Jab 2200 wheel pants and bucket seats 640#

Sent from my iPhone

Quote:
On Nov 5, 2017, at 10:21 AM, normros <norm2mac(at)gmail.com> wrote:



I bought a Mk3 classic a few months ago and have been trying to get it back onto the UK register. I have been told I need an up to date weight and balance. However when I weighed the A/C I found it had put on 35 kilos since it's last weighing.
It has been sitting unused for 4 years in a metal trailer - is it possible the fabric and/or airframe has absorbed moisture? Nothing (according to the log book) has been added since it's last weighing.
Weights are (first weight is latest, second in brackets is previous):-
Left wheel - 100 kilos (86 kilos)
Right wheel - 100 kilos (84 kilos)
Tail wheel - 30.5 kilos (29.8 kilos)
Given that the tail weights are pretty similar, all the gained weight would appear to be round the wings and cockpit where the majority of the fabric is.
Fuel in tanks has been allowed for.

Thanks, Norman




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zeprep251(at)aol.com
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PostPosted: Mon Nov 06, 2017 5:56 am    Post subject: Mk 3 Classic weight Reply with quote

70 # is hard to miss. Agree that original numbers could be fiction.

Sent from my iPhone

Quote:
On Nov 5, 2017, at 10:51 AM, Rex Rodebush <jrrodebush(at)gmail.com> wrote:



Were the same scales used since last time? Has fuel been added since last time? Did the last guy add additional instrumentation or other stuff after he did the first weigh?




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John Hauck



Joined: 09 Jan 2006
Posts: 4431
Location: Titus, Alabama (hauck's holler)

PostPosted: Mon Nov 06, 2017 6:12 am    Post subject: Mk 3 Classic weight Reply with quote

My MKIIIc weighed 630 lbs in 1994. No telling what it weighs now. That's
with a 912ULS.

john h
mkIII
Titus, Alabama


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John Hauck
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normros



Joined: 15 Sep 2017
Posts: 9

PostPosted: Thu Nov 09, 2017 1:33 am    Post subject: Re: Mk 3 Classic weight Reply with quote

Thanks everyone for your input. I'm trying to contact the original builder to see if there's any explanation.

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