B 84
My new 4-stroke flat-four is now ready for take of!
After a period of development of at least 1 1/2 years I’m now able to
offer you a four cylinder flat with 84 ccm - equivalent to the 500 cu-inch-class
– and I must admit that I’m a little bit proud on this engine..:
The basic construction elements of pistons and arbour-bearing-sleeves have
been adopted from the approved V42-engine in a modified manor of construction:
Like a “big” engine, the pistons are equipped with piston-- and
oil-scraper-rings.
Comparing with the structure of some more inexpensive engines available on
the market, the B84 is also equipped with a solid, one-piec, precised hardened
crankshaft with stable connecting rods and bushings . It is placed in a solidly
built, torsion-resistant crankcase, kept in its place by nearly indestructible
bearings:
Vibrations and pre-programmed “weak-points” are minimized by this
way.
Watching the photos, you surely have recognized, that the B84 has no single
cylinder-heads as the V42, but “ benches” for each pair of cylinders:
This is not a personal design fashion of mine, but a constructive necessity
with decisive advantages:
The lavish constructed “ double-heads” prevent an overheating
of the rear cylinders, that might appear while running the engine under unfavourable
operating conditions; the energy can be acceded by the colder front cylinders,
to avoid this constructive-related problem - comparable to the solutions of
Volkswagen and Porsche with air-cooled flat-engines. –
Of course the B84 – similar to the V42 - has its own independent lubrication-system,
that allows a running with unleaded gas without any necessary oil additives!
The only thing to do, is to control the oil level in the crank case from time
to time – as you usually do it with the engine of your car. -
Now, of course, there’s the decisive and important question:
Is the B84 suitable for aerobatics?
I can answer this question with a clear “Yes” – without
any limits:
The “heart” of the lubrication system is a cog-wheel-pump, that
– in contrast to a conventional piston-oil-pump - is able to build up
a reliable and constant oil pressure over the whole range of rpm – a
decisive advantage in practical use. –
By this way, a pump-fed-lubrication with a sufficient number of oil-tubes,
that are placed in- and outside the motor-block, guaranties a reliable lubrication
of all necessary engine-parts - independent from the flight position of the
engine while flying stunt figures. –
For friends of practical use: The single carburettor guaranties an easy and
quick engine-setting with a reliable performance through the whole range of
rpm. –
The B84 is easy to start: A Becker-MC-Ignition-system with integrated automatic
ignition advance enables a “fingerfriendly” and spontaneous (cold
or warm ) engine start ; the ignition advance system harmonizes with the characteristic
of the B84: High torque is available from low engine speed up to maximum of
rpm: Good news for friends of “big props”!
This engines convinces its owner with its smooth running combined with a powerful,
fine and decent scale sound reminding to large airplane-engines!
The power of this engine I can describe with a few words: For starting and
flying my Fly-Baby biplane
with a weight of 12 kilograms I have to be cautious with the gas-stick; the
B84 is never really seriously stressed…
The included engine-bearer is specially designed for this engine and enables
a precise, secure and simple assembly at the most of fuselage-motor-frames.-
Technical Data:
Size: 84 ccm or 504 cu inch
Bore: 32,00 mm
Stroke: 26,00 mm
Weight: 3100 g
Gas: gas unleaded
Ignition: System Becker-MC with ignition advance
Output: 5800 rpm with 26“X12 prop.
Price:
Engine B84, including ignition-system and engine bearer: 2680,00 €