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1pr HO Slot Car Aurora Thunderjet T-Jet style MAGNETS BTO, Better Than Original!
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Price: $5.49
5 Available
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Item Description
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You
are one (1) PAIR of newly made B.T.O. Better than original Magnets for
an Aurora Thunderjet 500 T-Jet style car. They are much better materials
and performance than the originals. Comparable to the Dash T-Dash
magnets. Newly made to exacting standards!
These new compression
bonded neo (also known as poly) magnets have been made in multiple
strengths to offer a wide range of options for use in Thunderjet and AFX
non-mag chassis.
These magnets are made from BCN-27 grade
material. Overall within this grade there are eight levels of strength,
ranging from BCN-27 (BCN-27-1) which is the strongest to BCN-27-8
(weakest).
All the magnets were produced from the same mold so
there are no dimensional differences regardless of grade. Since not all
chassis are the same, the fit can sometimes be a little tight but will
always fit. In many cases, the two magnet pockets on any individual
chassis can very such that the same magnet is tight in the front pocket
and a perfect fit in the rear pocket, or vise-versa.
The common
misconception is all poly magnets are stronger than ceramic magnets and
that is simply not true. Just as ceramic magnets can be made in
different strengths, poly magnets can be weaker or stronger depending on
the grade of material used. Since batches of poly magnets are made
from a mixed powder, the magnets have much less variance in strength
than their ceramic counterparts. Getting a matched pair of poly magnets
is much easier than finding a pair of matched ceramic magnets because
their strength is more consistent.
Five grades of BCN-27
magnets are now available for T-Jets and AFX: BCN-27-2 (strongest),
BCN-27-3, BCN-27-4, BCN-27-5 and BCN-27-6. The right magnet for any
given chassis and application will need to be determined by testing,
setup, personal preference and any applicable racing organization rules.
These options allow a choice of the magnet strength that works best in
any given situation. A stronger magnet does not necessarily mean better
performance. Matching magnet strength to the armature is key.
To compare the strength of poly and ceramic magnets, it is necessary to
compare the MGOe numbers for each grade of magnet from available
charts. The MGOe number represents the maximum energy product. There
are other characteristics of all magnets, such as shock resistance, heat
resistance, etc., but to compare magnetic strength it is the MGOe
number which is important.
While Aurora magnets can vary
widely, it's believed the common ceramic strength magnet used in Dash,
Johnny Lightning and Auto World chassis is C8B. It's MGOe number is in
the range of 3.6-4.0. To compare that to BCN-27 magnets, the comparable
grade magnet would be either BCN-27-5 (3.0-4.0) or BCN-27-4 (4.0-5.0).
The strongest ceramic magnet is rated C12 and has a range of 4.8-5.2. A
BCN-10 poly magnet (commonly referred to as poly 10) has an MGOe number
of 10.0-11.0.
The MGOe numbers for BCN-27 grade magnets are as follows:
BCN-27: 7.0-8.0
BCN-27-2: 6.0-7.0
BCN-27-3: 5.0-6.0
BCN-27-4: 4.0-5.0
BCN-27-5: 3.0-4.0
BCN-27-6: 2.0-3.0
BCN-27-7: 1.0-2.0
BCN-27-8: 0.5-1.0
These numbers were borne out by measuring the magnetic pull on a piece
of steel using a regular weight scale and a random sample of magnets.
While the following numbers do not correlate to any given scale, they
show the relative strength of various Thunderjet style magnets.
The numbers below indicate the North/South average as well as the number of pairs tested. The pull was measured in grams.
3.30/3.20 (1): OS3 Red Dragon
4.86/4.92 (19): BCN-27-6
5.0/5.0 (1): OS3 Blue Dragon
6.71/6.64 (19): BCN-27-5
7.32/7.41 (10): Auto World
8.45/8.52 (10): Dash (early)
9.13/9.28 (10): Dash (later)
9.37/9.52 (10): BCN-27-4
11.6/11.0 (1): OS3 Black Dragon
11.53/11.52 (15): BCN-27-3
14.05/14.09 (15): BCN-27-2
20.23/20.41 (9): BCN-10 (Poly 10)
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