Tim
I am not pro and should be more carefull but I am sure you are right.
Mono bungee has nothing to do with landing /suspension, damping or bouncing.
It is only to help pilot to retract.
Manual page 29-5: "To assist pilot in retracting the LG into the centre tunnel
a bungee cord is used".
So, if you loose it, no worries.
I think mono is still retractable w/o bungee and if not - so what?
Coming back to my original question:
I cannot see any obvious problem if changing bungee to spring.
Spring could be more permanent solution, easier to adjust and optimize and no
time
period.
Probably spring is heavier than bungee anyway and more expensive solution also.
For example I would like to have my bungee more powerful.
It is quite easy to retract but that exercise is not sophisticated enough (!).
Definetely I am not going to tighten it up because of hard labor.
Too taut bungee is probaly giving upp earlier.
So professors - how is a spring???
Raimo OH-XRT
----- Original Message -----
From: "Tim Houlihan" <houlihan@blueyonder.co.uk>
Sent: Wednesday, April 15, 2009 12:39 PM
Subject: Re: Europa-List: Mod 70
>
> Karl.
> I may be wrong on this as I am working from my memory which can be very
> suspect.
> My understanding of the Mono undercarriage is that the rubber bungee's
> are there to assist with lifting the wheel assembly to the retracted
> position. The suspension is managed by the "rubber" block between the
> reaction plates. any damping is due to the "thwack" effect mentioned by
> Graham, or by the optional , at least it was optional on the Classic,
> twin shock absorbers fitted through the middle of the elastomer block.
>
> Tim
>
>
> Karl Heindl wrote:
> >
> >
> > My own experience confirms this. A spring suspension on the mono would
> > cause some very interesting landings. It's bad enough on a trike. Very
> > similar to : removing the shock absorbers from the front suspension of
> > your car, and driving it at 80 90 km/h along a bumpy grass field.
> >
> > Karl
> >
> > >
> > <grahamsingleton@btinternet.com>
> > >
> > > Robert Borger wrote:
> > > > Raimo,
> > > >
> > > > My understanding from discussions with Nev is that the spring
> > reaction
> > > > of a metal spring is incorrect for this application.
> > > >
> > > > Bob B
> > > The important point is that rubber has a damping effect but steel does
> > > not. This is why rubber, (elastic) is better than steel (springs) for
> > > undercarriages.
> > > Think about it, a spring goes "boingyoingoing" but a rubber band goes
> > > "thwack"
> > > Graham
> > &g===========
> > >
> > >
> > >
> > *
> >
> >
> > *
> > ------------------------------------------------------------------------
> >
> >
> > Checked by AVG - www.avg.com
> >
> >
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