Today's Message Index:
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1. 01:33 AM - AW: Re: Bungee Cord (A. Buess Aviatik)
2. 02:24 AM - Re: AW: Re: Bungee Cord (GRAHAM SINGLETON)
3. 07:14 AM - Re: Bungee Cord (spcialeffects)
4. 09:35 AM - Re: Re: Bungee Cord (GRAHAM SINGLETON)
5. 11:45 AM - Re: Bungee Cord (spcialeffects)
6. 12:07 PM - AW: Re: Bungee Cord (jonathanmilbank)
Message 1
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Hi Jonathan and list members,
You mentioned " IMHO the bungee is set right when the uc/flap lever can
"float" approximately in the middle of the gate with air loads":
Does this mean that the air loads will compensate the weight of the flaps?
The bungee tension of my aircraft lifts the undercarriage to the middle
position without any force applied, if the wings are NOT fitted. Is this
enough? Or should the bungee also help to lift the flaps?
Regards, Alfred
Alfred Buess
CH-3700 Spiez, Switzerland
Europa XS HB-YKI, Ercoupe 415-E N94804
Message 2
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Alfred=0ANo, the airloads are (almost) balanced by the bearings of the flap
pivots. =0AThe pivots are on the same line as the airload vector of the fl
ap so there is no=0Aforce acting to raise or lower the flap.=0AThe bungee t
hen has only to- balance the weight of the main gear.=0AGraham=0A=0A=0A__
______________________________=0A From: A. Buess Aviatik <ykibuess@bluewin.
ch>=0ATo: europa-list@matronics.com =0ASent: Sunday, 24 August 2014, 9:32
=0ASubject: AW: Europa-List: Re: Bungee Cord=0A =0A=0A--> Europa-List messa
ge posted by: "A. Buess Aviatik" <ykibuess@bluewin.ch>=0A=0AHi Jonathan and
list members,=0A=0AYou mentioned " IMHO the bungee is set right when the u
c/flap lever can=0A"float" approximately in the middle of the gate with air
loads": =0A=0ADoes this mean that the air loads will compensate the weight
of the flaps?=0AThe bungee tension of my aircraft lifts the undercarriage
to the middle=0Aposition without any force applied, if the wings are NOT fi
tted. Is this=0Aenough? Or should the bungee also help to lift the flaps?
=0A=0ARegards, Alfred=0A=A8=A8=A8=A8=A8=A8=A8=A8=A8=A8=A8=A8=A8=A8=A8=A8=A8
=A8=A8=A8=A8=A8=A8=A8=A8=A8=A8=A8=A8=A8=A8=A8=A8=0AAlfred Buess=0ACH-3700 S
piez, Switzerland=0AEuropa XS HB-YKI, Ercoupe 415-E N94804=0A=0A=0A=0A=0A
===============
Message 3
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Dont have much time today so decided to have a good clean up and mop in the workshop
but before i started i loosened the bungee cord and was able to move the
landing gear up and down when standing outside of the plane. For some reason
i got it into my head that it had to be tight as hell! Thanks for all input.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=429210#429210
Message 4
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Frank=0Aleave a bit of spare on an accessible end so you can adjust it in a
bout 5 years!=0AGraham=0A=0A=0A=0A=0A________________________________=0A Fr
om: spcialeffects <spcialeffects@aol.com>=0ATo: europa-list@matronics.com
=0ASent: Sunday, 24 August 2014, 15:12=0ASubject: Europa-List: Re: Bungee C
cts@aol.com>=0A=0ADont have much time today so decided to have a good clean
up and mop in the workshop but before i started i loosened the bungee cord
and was able to move the landing gear up and down when standing outside of
the plane. For some reason i got it into my head that it had to be tight a
s hell! Thanks for all input.=0A=0A=0A=0A=0ARead this topic online here:=0A
=0Ahttp://forums.matronics.com/viewtopic.php?p=429210#429210=0A=0A=0A=0A
==================
Message 5
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Ahh the voice of experience Graham, I like it! The problem was, was that the bungee
was way too tight. The reason for this is that I was looking at the way the
bungee was used on the tri gears before the spring mod and getting confused
with the info I was gathering/seeing.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=429222#429222
Message 6
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| Subject: | Re: AW: Re: Bungee Cord |
Graham is correct, as usual. When I was experimenting by flying my aircraft, it
seemed that the air load on the flaps was almost neutral, particularly halfway
down but giving a slight lifting tendency when flaps were fully down.
I wouldn't worry too much about "perfection"; if the flaps can float/hover somewhere
along the gate when flying, that is just nice. Anyway I would definitely
recommend doing the bungee adjustments with the wings rigged.
The reason I had to re-adjust my bungee many years ago (kit #054) was that the
factory changed the specification of the bungee cord and I had to remove the old
one before starting again from "square one". Most of the adjustment is affected
by the mass of the undercarriage assembly and only a relatively small amount
of the adjustment is affected by the flaps.
Just follow the factory instructions carefully and you should get a good enough
result. I doubt that many builders waste too much time with experimenting.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=429223#429223
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