Cheers:
I agree with the following concept and feel that we should put some
more creative minds into the pot. There is no discussion of Level
Ground, so the sine of the angle well might vary the results to
considerable effect. Having seen the calculations concerning big
'planes, I has me doubts. How about asking some V-bomber/SAC pilots
their experience?
Happy Landings
Fer (#A064)
Gramin@aol.com wrote:
>
> Weight and balance is probably one of the most neglected topics outside the
> qualifying exams. One rarely sees scales lying around at club airfields or
> pilots asking for weights of passengers and their baggage. Experience tends
> to be relied upon to avoid awkward parts of the envelope. How nice it would
> be if there was an instrument read-out or display on the panel.
>
> However load cells in our AUW range do not come cheaply (100's) and they are
> needed on all the wheels. The mono Europa offers a unique opportunity to do
> something though, as the outrigger load can be neglected, leaving two wheels
> only. Furthermore as the arms of the loads are usually limited to the three
> fixed values for crew, fuel and baggage, these can be preset at loading time
> ( or if not a variable adjusted). This enables the tailwheel load to be
> deduced from the change in mainwheel load *
>
> So all we need is one sensor on the mainwheel. Again the Europa provides us
> with an almost made-to-measure (sic) solution, the damper block. A
> measurement of the change in spacing of the plates with load gives a
> proportional (or at least calibrateable) reading of the load change.
>
> My question to the Europa borg collective is therefore what is the most cost
> effective way rugged way of measuring a distance of around half an inch (with
> over-run to allow us our bounces) ? A linear pot. or capacitor comes to mind
> (whether rotational or physically linear) but I have a feeling there must be
> out there somewhere some neat devices with digital output which would save us
> the trouble of re-inventing strain gauges and their circuitry.
>
> Graham C. G-EMIN
>
> * wt/wm = (d-M)/(T-d)
> where
> M distance of mainwheel from datum
> T distance of tailwheel from datum
> d distance of added load, wt+wm
>
> from which some interesting figures can be derived e.g. one fifth of your
> baggage weight goes on the tail.
>
> P.S a much more challenging (impossible ?) task would be to do it in the air
!
> -though as only fuel can change signficantly in flight it would be simple to
> input the gauge reading or flow rate to make the appropriate change. The
> passengers can't move about in our machines, and the coffee and sandwiches
> don't weigh much.
>
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